JP6666064B2 - Light emitting device including semiconductor light emitting element and lighting method - Google Patents

Description

  The present invention relates to a light-emitting device having a plurality of light-emitting regions, wherein the light-emitting device can change the amount of light flux and / or the amount of radiant light emitted from each light-emitting region. Further, the present invention relates to a method for designing such a light emitting device, a method for driving the light emitting device, and a lighting method.

  2. Description of the Related Art In recent years, GaN-based semiconductor light-emitting devices have been remarkably developing higher output and higher efficiency. Also, high efficiency of various kinds of phosphors using a semiconductor light emitting element or an electron beam as an excitation source has been actively studied. As a result, light emitting devices such as a current light source, a light source module including a light source, a device including the light source module, and a system including the device are rapidly saving power as compared with a conventional device.

  For example, a GaN-based blue light-emitting element is included as an excitation light source for a yellow phosphor, and a so-called pseudo white light source is created from the spectrum of the GaN-based blue light-emitting element and the spectrum of the yellow phosphor, and a light source for illumination, or It is widely practiced to provide a lighting fixture with this built-in, and a lighting system in which a plurality of such fixtures are arranged in a space (see Patent Document 1).

A packaged LED (for example, a GaN-based blue light-emitting element, a yellow phosphor, a sealant, and the like included in a package material), which is a kind of illumination light source that can be included in these forms, has a correlated color of about 6000K. Some products have a light source efficiency of more than 150 lm / W as a packaged LED in a temperature (Correlated Color Temperature / CCT) region (see Non-Patent Document 2).
Further, light sources for liquid crystal backlights and the like have been similarly improved in efficiency and power saving.

However, it has been pointed out from various fields that these light-emitting devices aiming at high efficiency have insufficient consideration for color appearance. In particular, when used for lighting, the efficiency of the light emitting device such as a light source / apparatus / system and the like, and the "color appearance (Color)
Appearance "is very important.

Attempts to take these into consideration include improving the score of the Color Rendering Index / CRI (CIE (13.3)) established by the International Commission on Illumination (Commission Internationale de I'Eclairage / CIE). Attempts have been made to superimpose the spectrum of a red phosphor or a red semiconductor light emitting device on the spectrum of a blue light emitting device and the spectrum of a yellow phosphor. For example, the typical spectrum when free of red source (CCT = about 6800K), the average color rendering index (R _a) and special color rendering index for bright red color chart (R ₉₎ each R _a = 81, is a R ₉ = 24, it is possible to increase the score of _{R a = 98, R 9 =} 95 and color rendering index when containing the red source (see Patent Document 2).

  On the other hand, the inventor of the present application has proposed that, based on new experimental facts on the color appearance of the illumination target, the appearance of the color perceived by humans can be changed outdoors without depending on the scores of various color rendering metrics. Lighting method, lighting source, lighting fixture, lighting system, etc. that can realize natural, lively, high visibility, comfortable, color appearance, and object appearance as viewed under high illuminance environment (See Patent Documents 3 and 4).

According to Patent Documents 3 and 4, in a range where the index A _cg regarding the spectral distribution of light emitted from the light emitting device is −360 or more and −10 or less, the color appearance perceived by humans is natural, lively, and visible. It describes that a light emitting device that can realize highly visible, comfortable, color appearance and object appearance can be realized.

Japanese Patent No. 3503139 WO2011 / 024818 pamphlet Japanese Patent No. 5252107 Japanese Patent No. 5257538

"General fluorescent light meat", [online], Prince Electric Co., Ltd., [searched on May 16, 2011], Internet <URL: http://www.prince-d.co.jp/pdct/docs/ pdf / catalog_pdf / fl_nrb_ca2011.pdf> “LEDs MAGAZINE”, [Search August 22, 2011], Internet <URL: http://www.ledsmagazine.com/news/8/8/2>

However, the two patents include a radiation efficiency K (Luminous) derived from the spectral distribution.
Efficiency of Radiation (lm / W) is disclosed in detail, but there is no description about the efficiency as an actual light source, that is, light source efficiency η (Luminous Efficiency of a Source) (lm / W). In an actual LED light source, the latter is as important as the former, and is usually treated as an independent index of efficiency. The former (radiation efficiency K) is an efficiency that depends on the “shape only” of the spectral distribution of the light source in relation to the spectral luminous efficiency V (λ), and is a very useful index for considering the efficiency at ideal time. It is. On the other hand, the latter (light source efficiency η) is an amount indicating how much the electric power supplied to the light emitting device is converted into a luminous flux, and needs to be examined from a viewpoint different from the radiation efficiency.
In order to solve the above-described problems, the present inventor has reached a light emitting device with improved light source efficiency and a design guideline of the light emitting device in Japanese Patent Application No. 2014-159784.

The light source that satisfies the requirements that the present inventors have already found improves the light source efficiency while realizing "natural, lively, highly visible, comfortable, color appearance, object appearance". it can.
However, the preference of lighting considered to be optimal varies little by age, gender, country, and the like, and the optimal lighting varies depending on what space is illuminated and for what purpose. Furthermore, there may be a large difference in the preference of the lighting considered to be optimal between subjects who have different living environments and cultures.
The present invention is a light emitting device capable of realizing natural, lively, highly visible, comfortable, color appearance, and the appearance of an object as viewed outdoors, and has improved light source efficiency. It is still another object of the present invention to provide a light emitting device capable of changing a color appearance of an illuminated object and a design method for the light emitting device in order to satisfy various requirements for illumination. Still another object of the present invention is to provide a method for driving the light emitting device and a lighting method using the device.

  In order to achieve the above object, a first embodiment of the present invention relates to the following light emitting device.
[1] A light-emitting device including M light-emitting regions (M is a natural number of 2 or more) and including a blue semiconductor light-emitting element, a green phosphor, and a red phosphor as light-emitting elements in at least one of the light-emitting regions.
So,
  The spectral distribution of light emitted from each light emitting region in the main radiation direction of the light emitting device is φ_SSLN (
λ) (N is 1 to M), and the spectral distribution φ of all light emitted in the emission direction from the light emitting device._SSL(Λ) is
At the time
  The φ_SSL(Λ) is a light emission in which a light emitting region capable of satisfying the following conditions 1-4 is included.
apparatus.
Condition 1:
  The light emitted from the light emitting device has a distance D from a blackbody radiation locus defined by ANSI C78.377._uvSSLIs -0.0220 ≤ D_uvSSL  ≦ −0.0070 in the main radiation direction.
Condition 2:
  The spectral distribution of light emitted in the emission direction from the light emitting device is φ_SSL(Λ), the light emitting device
Color temperature T of light emitted from the device in the radiation direction_SSLOf the criteria selected according to (K)
The spectral distribution of light is φ_ref(Λ), tristimulus value of light emitted from the light emitting device in the radiation direction
To (X_SSL, Y_SSL, Z_SSL), Correlated color temperature of light emitted from the light emitting device in the radiation direction
Degree T_SSLThe reference tristimulus value of light selected according to (K) is (X_ref, Y_ref, Z_ref)age,
  Normalized spectral distribution S of light emitted in the emission direction from the light emitting device_SSL(Λ) and the above
Correlated color temperature T of light emitted in the emission direction from the light emitting device_SSLSelected according to (K)
Standardized spectral distribution S of reference light_ref(Λ) and the difference ΔS (λ) between these normalized spectral distributions
Each,
  S_SSL(Λ) = φ_SSL(Λ) / Y_SSL
  S_ref(Λ) = φ_ref(Λ) / Y_ref
  ΔS (λ) = S_ref(Λ) -S_SSL(Λ)
Is defined as
  In the wavelength range of 380 nm to 780 nm, S_SSLGives the longest wavelength maximum of (λ)
Wavelength λ_R(Nm), λ_RS on the longer wavelength side than_SSL(Λ_R) / 2 when there is a wavelength 存在 4,
  Index A represented by the following equation (1)_cgIs -10 <A_cgSatisfies ≦ 120,
  In the wavelength range of 380 nm to 780 nm, S_SSLGives the longest wavelength maximum of (λ)
Wavelength λ_R(Nm), λ_RS on the longer wavelength side than_SSL(Λ_R) / 2 when there is no wavelength Λ4,
  Index A represented by the following equation (2)_cgIs -10 <A_cgSatisfies ≦ 120.
Condition 3:
  The spectral distribution φ of the light_SSL(Λ) is spectroscopy in the range of 430 nm to 495 nm.
The maximum value of the strength is φ_SSL-BM-maxThe minimum value of the spectral intensity in the range from 465 nm to 525 nm is φ_SSL-BG-minWhen defined as
  0.2250 ≤ φ_SSL-BG-min/ Φ_SSL-BM-max  ≤ 0.7000
It is.
Condition 4:
  The spectral distribution φ of the light_SSL(Λ) is spectroscopy in the range of 590 nm to 780 nm.
The maximum value of the strength is φ_SSL-RM-maxWhen defined as φ_SSL-RM-maxGives the wavelength λ_SSL-RM-maxBut,
  605 (nm) ≦ λ_SSL-RM-max  ≤ 653 (nm)
It is.
[2] The light-emitting device according to [1], wherein all φ_SSLN (λ) (N is 1 to M)
A light emitting device satisfying the above conditions 1-4.
[3] The light-emitting device according to [1] or [2], wherein at least one of the M light-emitting regions can be electrically driven independently of other light-emitting regions. Light emitting device used as wiring.
[4] The light emitting device according to [3], wherein all of the M light emitting regions are wirings that can be electrically driven independently of other light emitting regions.
[5] The light emitting device according to any one of [1] to [4], wherein the following condition 5 is satisfied.
Condition 5:
  The spectral distribution φ of the light_SSLIn (λ), the above φ_SSL-BM-maxGives the wavelength λ_SSL-BM-max
But,
  430 (nm) ≦ λ_SSL-BM-max  ≤ 480 (nm)
It is.
[6] The light emitting device according to any one of [1] to [5], wherein the following condition 6 is satisfied.
Condition 6:
  0.1800 ≤ φ_SSL-BG-min/ Φ_SSL-RM-max  ≤ 0.8500
[7] The light emitting device according to any one of [1] to [6], wherein the φ_SSLDerived from (λ)
A light emitting device characterized in that a radiation efficiency K (lm / W) in a range of a wavelength of 380 nm to 780 nm satisfies the following condition 7:
Condition 7:
  210.0 lm / W ≦ K ≦ 290.0 lm / W
[8] The light emitting device according to any one of [1] to [7], wherein the index A represented by the mathematical formula (1) or (2)._cg, Correlated color temperature T_SSL(K) and the distance D from the blackbody radiation locus_uvSSLA light emitting device wherein at least one selected from the group consisting of:
[9] The light emitting device according to [8], wherein the index A represented by the mathematical formula (1) or (2)._cg, Correlated color temperature T_SSL(K) and the distance D from the blackbody radiation locus_uvSSLA light emitting device characterized in that when at least one selected from the group consisting of: is changed, the light flux and / or the radiation flux emitted in the main radiation direction from the light emitting device can be controlled independently.
[10] The light-emitting device according to any one of [1] to [9], wherein a maximum distance L formed by any two points on a virtual outer periphery enclosing the whole of the different light-emitting regions closest to each other is 0. A light emitting device having a size of not less than 4 mm and not more than 200 mm.
[11] The light emitting device according to any one of [1] to [10],
  By changing the amount of luminous flux and / or the amount of radiant flux emitted from the light emitting region, φ_SSL
A light emitting device having a light emitting region in which (λ) can further satisfy the following conditions I-IV.
Condition I:
  CIE 1976 L of the following 15 types of modified Munsell color charts # 01 to # 15 assuming that illumination by light emitted in the radiation direction is mathematically assumed.^*a^*b^*A in color space^*Value, b^*Value is a^* _nSSL, B^* _nSSL(Where n is a natural number from 1 to 15)
  Correlated color temperature T of light emitted in the emission direction_SSLWith reference light selected according to (K)
CIE 1976 L of the 15 types of modified Munsell color charts when mathematically assuming the illumination of^*a^*b^*A in color space^*Value, b^*Value is a^* _nref, B^* _nref(However, n is from 1
15, a saturation degree difference ΔC_nBut
  −4.00 ≦ ΔC_n≤ 8.00 (n is a natural number from 1 to 15)
Meet.
Condition II:
  Average SAT of saturation difference represented by the following equation (3)_aveIs 0.50 ≦ SAT_aveSatisfies ≦ 4.00.
Condition III:
  The maximum value of the saturation difference is ΔC_max, The minimum value of the saturation difference is ΔC_minWhere | ΔC between the maximum value of the saturation difference and the minimum value of the saturation difference_max−ΔC_min|
  2.00 ≤ | ΔC_max−ΔC_min| ≦ 10.00
Meet.
  Where ΔC_n= √ ｛(a^* _nSSL)^Two+ (B^* _nSSL)^Two｝ -√ ｛(a^* _nref)^Two+ (B^* _nref)^Two｝.
  15 types of modified Munsell color chart
  # 01 7.5 P 4/10
  # 02 10 PB 4/10
  # 03 5 PB 4/12
  # 04 7.5 B5 / 10
  # 05 10 BG 6/8
  # 06 2.5 BG 6/10
  # 07 2.5 G 6/12
  # 08 7.5 GY 7/10
  # 09 2.5 GY 8/10
  # 10 5 Y 8.5 / 12
  # 11 10 YR7 / 12
  # 125 YR7 / 12
  # 13 10 R 6/12
  # 145 R4 / 14
  # 15 7.5 RP 4/12
Condition IV:
  The CIE 1976 L of the above-mentioned 15 types of modified Munsell color chart when the illumination by the light emitted in the radiation direction is mathematically assumed.^*a^*b^*The hue angle in the color space is θ_nSSL(Degree) (ta
Where n is a natural number from 1 to 15)
  Correlated color temperature T of light emitted in the emission direction_SSLWith reference light selected according to (K)
CIE 1976 L of the 15 types of modified Munsell color charts when mathematically assuming the illumination of^*a^*b^*The hue angle in the color space is θ_nref(Degrees) (where n is a natural number from 1 to 15)
The absolute value of the hue angle difference | Δh_n|
  0.00 degrees ≤ | Δh_n| ≤ 12.50 degrees (n is a natural number from 1 to 15)
Meet.
  Where Δh_n= Θ_nSSL−θ_nrefAnd
[12] The light-emitting device according to any one of [1] to [11],
  The light emitted from the light emitting device in the radiation direction has a correlated color temperature T_SSL(K)
  2600 K ≤ T_SSL  ≤ 7700 K
A light emitting device characterized by being able to satisfy the following.
[13] The light emitting device according to any one of [1] to [12],
  By changing the amount of luminous flux and / or the amount of radiant flux emitted from the light emitting region, the φ_SSL(Λ) is characterized in that a light emitting region capable of satisfying the above conditions 1-4 is inherent.
Light emitting device.
[14] A method of designing a light-emitting device in which M light-emitting regions (M is a natural number of 2 or more) are present and at least one of the light-emitting regions includes a blue semiconductor light-emitting element, a green phosphor, and a red phosphor as light-emitting elements. And
  The spectral distribution of light emitted from each light emitting region in the main radiation direction of the light emitting device is φ_SSLN (
λ) (N is 1 to M), and the spectral distribution φ of all light emitted in the emission direction from the light emitting device._SSL(Λ) is
At the time
  The φ_SSL(Λ) is changed so that the light emitting region becomes a configuration capable of satisfying the following conditions 1-4.
A method for designing a light emitting device for designing a region.
Condition 1:
  The spectral distribution φ of the light_SSL(Λ) is a blackbody radiation gauge defined in ANSI C78.377.
Distance from trace D_uvSSLBut,
  −0.0220 ≦ D_uvSSL  ≦ −0.0070
It is.
Condition 2:
  The spectral distribution of light emitted in the emission direction from the light emitting device is φ_SSL(Λ), the light emitting device
Color temperature T of light emitted from the device in the radiation direction_SSLOf the criteria selected according to (K)
The spectral distribution of light is φ_ref(Λ), tristimulus value of light emitted from the light emitting device in the radiation direction
To (X_SSL, Y_SSL, Z_SSL), Correlated color temperature of light emitted from the light emitting device in the radiation direction
Degree T_SSLThe reference tristimulus value of light selected according to (K) is (X_ref, Y_ref, Z_ref)age,
  Normalized spectral distribution S of light emitted in the emission direction from the light emitting device_SSL(Λ) and the above
Correlated color temperature T of light emitted in the emission direction from the light emitting device_SSLSelected according to (K)
Standardized spectral distribution S of reference light_ref(Λ) and the difference ΔS (λ) between these normalized spectral distributions
Each,
  S_SSL(Λ) = φ_SSL(Λ) / Y_SSL
  S_ref(Λ) = φ_ref(Λ) / Y_ref
  ΔS (λ) = S_ref(Λ) -S_SSL(Λ)
Is defined as
  In the wavelength range of 380 nm to 780 nm, S_SSLGives the longest wavelength maximum of (λ)
Wavelength λ_R(Nm), λ_RS on the longer wavelength side than_SSL(Λ_R) / 2 when there is a wavelength 存在 4,
  Index A represented by the following equation (1)_cgIs -10 <A_cgSatisfies ≦ 120,
  In the wavelength range of 380 nm to 780 nm, S_SSLGives the longest wavelength maximum of (λ)
Wavelength λ_R(Nm), λ_RS on the longer wavelength side than_SSL(Λ_R) / 2 when there is no wavelength Λ4,
  Index A represented by the following equation (2)_cgIs -10 <A_cgSatisfies ≦ 120.
Condition 3:
  The spectral distribution φ of the light_SSL(Λ) is spectroscopy in the range of 430 nm to 495 nm.
The maximum value of the strength is φ_SSL-BM-maxThe minimum value of the spectral intensity in the range from 465 nm to 525 nm is φ_SSL-BG-minWhen defined as
  0.2250 ≤ φ_SSL-BG-min/ Φ_SSL-BM-max  ≤ 0.7000
It is.
Condition 4:
  The spectral distribution φ of the light_SSL(Λ) is spectroscopy in the range of 590 nm to 780 nm.
The maximum value of the strength is φ_SSL-RM-maxWhen defined as φ_SSL-RM-maxGives the wavelength λ_SSL-RM-maxBut,
  605 (nm) ≦ λ_SSL-RM-max  ≤ 653 (nm)
It is.
[15] The method for designing a light-emitting device according to [14], wherein all φ_SSLN (λ) (N is 1
To M) are methods for designing a light emitting device satisfying the above conditions 1-4.
[16] The method for designing a light emitting device according to [14] or [15], wherein at least one of the M light emitting regions is electrically independent of other light emitting regions. A method for designing a light-emitting device that can be driven.
[17] The method for designing a light emitting device according to [16], wherein all of the M light emitting regions are wirings that can be electrically driven independently of other light emitting regions. .
[18] A method for designing a light emitting device according to any one of [14] to [17], wherein the following condition 5 is satisfied.
Condition 5:
  The spectral distribution φ of the light_SSLIn (λ), the above φ_SSL-BM-maxGives the wavelength λ_SSL-BM-max
But,
  430 (nm) ≦ λ_SSL-BM-max  ≤ 480 (nm)
It is.
[19] A method for designing a light emitting device according to any one of [14] to [18], wherein the following condition 6 is satisfied.
Condition 6:
  0.1800 ≤ φ_SSL-BG-min/ Φ_SSL-RM-max  ≤ 0.8500
[20] The method for designing a light-emitting device according to any one of [14] to [19], wherein the φ_SSLRadiation efficiency K (lm / m) in the range of wavelength 380 nm to 780 nm derived from (λ)
W) which satisfies the following condition 7:
Condition 7:
  210.0 lm / W ≦ K ≦ 290.0 lm / W
[21] The method for designing a light emitting device according to any one of [14] to [20], wherein the index A represented by the mathematical formula (1) or (2) is used._cg, Correlated color temperature T_SSL(K) and blackbody radiation trajectory
Distance D_uvSSLFor designing a light emitting device in which at least one selected from the group consisting of
Law.
[22] The method for designing a light emitting device according to [21], wherein the light emitting device is represented by the formula (1) or (2).
Index A_cg, Correlated color temperature T_SSL(K) and the distance D from the blackbody radiation locus_uvSSLA light flux and / or a radiant flux emitted in a main radiation direction from the light emitting device when at least one selected from the group consisting of: is changed.
[23] The method for designing a light-emitting device according to any one of [14] to [22], wherein the maximum distance L formed by any two points on a virtual outer periphery enclosing the whole of the different light-emitting regions that are closest to each other. Is a light emitting device having a thickness of 0.4 mm or more and 200 mm or less.
[24] The method for designing a light emitting device according to any one of [14] to [23],
  By changing the amount of luminous flux and / or radiant flux emitted from the light emitting region, φ_SSL(
λ) can further satisfy the following conditions I-IV.
Condition I:
  CIE 1976 L of the following 15 types of modified Munsell color charts # 01 to # 15 assuming that illumination by light emitted in the radiation direction is mathematically assumed.^*a^*b^*A in color space^*Value, b^*Value is a^* _nSSL, B^* _nSSL(Where n is a natural number from 1 to 15)
  The CIE 1976 L of the 15 types of modified Munsell color charts when mathematically assuming illumination with reference light selected according to the correlated color temperature T (K) of the light emitted in the radiation direction.^*
a^*b^*A in color space^*Value, b^*Value is a^* _nref, B^* _nref(Where n is a natural number from 1 to 15), the saturation degree difference ΔC_nBut
  −4.00 ≦ ΔC_n≤ 8.00 (n is a natural number from 1 to 15)
Meet.
Condition II:
  Average SAT of saturation difference represented by the following equation (3)_aveIs 0.50 ≦ SAT_aveSatisfies ≦ 4.00.
Condition III:
  The maximum value of the saturation difference is ΔC_max, The minimum value of the saturation difference is ΔC_minWhere | ΔC between the maximum value of the saturation difference and the minimum value of the saturation difference_max−ΔC_min|
  2.00 ≤ | ΔC_max−ΔC_min| ≦ 10.00
Meet.
  Where ΔC_n= √ ｛(a^* _nSSL)^Two+ (B^* _nSSL)^Two｝ -√ ｛(a^* _nref)^Two+ (B^* _nref)^Two｝.
  15 types of modified Munsell color chart
  # 01 7.5 P 4/10
  # 02 10 PB 4/10
  # 03 5 PB 4/12
  # 04 7.5 B5 / 10
  # 05 10 BG 6/8
  # 06 2.5 BG 6/10
  # 07 2.5 G 6/12
  # 08 7.5 GY 7/10
  # 09 2.5 GY 8/10
  # 10 5 Y 8.5 / 12
  # 11 10 YR7 / 12
  # 125 YR7 / 12
  # 13 10 R 6/12
  # 145 R4 / 14
  # 15 7.5 RP 4/12
Condition IV:
  The CIE 1976 L of the above-mentioned 15 types of modified Munsell color chart when the illumination by the light emitted in the radiation direction is mathematically assumed.^*a^*b^*The hue angle in the color space is θ_nSSL(Degree) (ta
Where n is a natural number from 1 to 15)
  Correlated color temperature T of light emitted in the emission direction_SSLWith reference light selected according to (K)
CIE 1976 L of the 15 types of modified Munsell color charts when mathematically assuming the illumination of^*a^*b^*The hue angle in the color space is θ_nref(Degrees) (where n is a natural number from 1 to 15)
The absolute value of the hue angle difference | Δh_n|
  0.00 degrees ≤ | Δh_n| ≤ 12.50 degrees (n is a natural number from 1 to 15)
Meet.
  Where Δh_n= Θ_nSSL−θ_nrefAnd
[25] The method for designing a light emitting device according to any one of [14] to [24],
  The light emitted from the light emitting device in the radiation direction has a correlated color temperature T_SSL(K)
  2600 K ≤ T_SSL  ≤ 7700 K
A method for designing a light emitting device, characterized by being able to satisfy the following.
[26] The method for designing a light emitting device according to any one of [14] to [25] 5,
  By changing the amount of luminous flux and / or the amount of radiant flux emitted from the light emitting region, the φ_SSLThe light emitting region is designed so that (λ) has a configuration capable of satisfying the above conditions 1-4.
A method for designing a light emitting device.
[27] A driving method of a light-emitting device in which M light-emitting regions (M is a natural number of 2 or more) are intrinsic and at least one of the light-emitting regions includes a blue semiconductor light-emitting element, a green phosphor, and a red phosphor as light-emitting elements. And
  The spectral distribution of light emitted from each light emitting region in the main radiation direction of the light emitting device is φ_SSLN (
λ) (N is 1 to M), and the spectral distribution φ of all light emitted in the emission direction from the light emitting device._SSL(Λ) is
At the time
  φ_SSL(Λ) is supplied to each of the light emitting regions so as to satisfy the following conditions 1-4.
For driving a light emitting device.
Condition 1:
  The spectral distribution φ of the light_SSL(Λ) is a blackbody radiation gauge defined in ANSI C78.377.
Distance from trace D_uvSSLBut,
  −0.0220 ≦ D_uvSSL  ≦ −0.0070
It is.
Condition 2:
  The spectral distribution of light emitted in the emission direction from the light emitting device is φ_SSL(Λ), the light emitting device
Color temperature T of light emitted from the device in the radiation direction_SSLOf the criteria selected according to (K)
The spectral distribution of light is φ_ref(Λ), tristimulus value of light emitted from the light emitting device in the radiation direction
To (X_SSL, Y_SSL, Z_SSL), Correlated color temperature of light emitted from the light emitting device in the radiation direction
Degree T_SSLThe reference tristimulus value of light selected according to (K) is (X_ref, Y_ref, Z_ref)age,
  Normalized spectral distribution S of light emitted in the emission direction from the light emitting device_SSL(Λ) and the above
Correlated color temperature T of light emitted in the emission direction from the light emitting device_SSLSelected according to (K)
Standardized spectral distribution S of reference light_ref(Λ) and the difference ΔS (λ) between these normalized spectral distributions
Each,
  S_SSL(Λ) = φ_SSL(Λ) / Y_SSL
  S_ref(Λ) = φ_ref(Λ) / Y_ref
  ΔS (λ) = S_ref(Λ) -S_SSL(Λ)
Is defined as
  In the wavelength range of 380 nm to 780 nm, S_SSLGives the longest wavelength maximum of (λ)
Wavelength λ_R(Nm), λ_RS on the longer wavelength side than_SSL(Λ_R) / 2 when there is a wavelength 存在 4,
  Index A represented by the following equation (1)_cgIs -10 <A_cgSatisfies ≦ 120,
  In the wavelength range of 380 nm to 780 nm, S_SSLGives the longest wavelength maximum of (λ)
Wavelength λ_R(Nm), λ_RS on the longer wavelength side than_SSL(Λ_R) / 2 when there is no wavelength Λ4,
  Index A represented by the following equation (2)_cgIs -10 <A_cgSatisfies ≦ 120.
Condition 3:
  The spectral distribution φ of the light_SSL(Λ) is spectroscopy in the range of 430 nm to 495 nm.
The maximum value of the strength is φ_SSL-BM-maxThe minimum value of the spectral intensity in the range from 465 nm to 525 nm is φ_SSL-BG-minWhen defined as
  0.2250 ≤ φ_SSL-BG-min/ Φ_SSL-BM-max  ≤ 0.7000
It is.
Condition 4:
  The spectral distribution φ of the light_SSL(Λ) is spectroscopy in the range of 590 nm to 780 nm.
The maximum value of the strength is φ_SSL-RM-maxWhen defined as φ_SSL-RM-maxGives the wavelength λ_SSL-RM-maxBut,
  605 (nm) ≦ λ_SSL-RM-max  ≤ 653 (nm)
It is.
[28] The method for driving a light emitting device according to [27], wherein all φ_SSLN (λ) (N is 1
To M), the method for driving a light emitting device for supplying power to the light emitting region so as to satisfy the above conditions 1-4.
[29] The method for driving a light emitting device according to [27] or [28], wherein at least one of the M light emitting regions is electrically driven independently of other light emitting regions. For driving a light emitting device.
[30] The driving method of the light emitting device according to any one of [27] to [29], wherein all of the M light emitting regions are electrically independently driven with respect to other light emitting regions. Drive method.
[31] A method for driving a light emitting device according to any one of [27] to [30], wherein the following condition 5 is satisfied.
Condition 5:
  The spectral distribution φ of the light_SSLIn (λ), the above φ_SSL-BM-maxGives the wavelength λ_SSL-BM-max
But,
  430 (nm) ≦ λ_SSL-BM-max  ≤ 480 (nm)
It is.
[32] A driving method of the light emitting device according to any one of [27] to [31], wherein the driving method includes:
A method for driving a light emitting device, characterized by satisfying condition 6.
Condition 6:
  0.1800 ≤ φ_SSL-BG-min/ Φ_SSL-RM-max  ≤ 0.8500
[33] The method for driving a light emitting device according to any one of [27] to [32], wherein the φ_SSLRadiation efficiency K (lm / m) in the range of wavelength 380 nm to 780 nm derived from (λ)
W) which satisfies the following condition 7:
Condition 7:
  210.0 lm / W ≦ K ≦ 290.0 lm / W
[34] The method for driving a light emitting device according to any one of [27] to [33], wherein the index A represented by the formula (1) or (2) is used._cg, Correlated color temperature T_SSL(K) and blackbody radiation trajectory
Distance D_uvSSLFor driving a light emitting device that changes at least one selected from the group consisting of
Law.
[35] The method for driving a light emitting device according to [34], wherein the index A represented by the mathematical formula (1) or (2) is used._cg, Correlated color temperature T_SSL(K) and the distance D from the blackbody radiation locus_uvSSLA method of driving a light-emitting device in which, when at least one selected from the group consisting of:
[36] The driving method of the light emitting device according to [34], wherein the index A represented by the mathematical formula (1) or (2) is used._cgA method for driving a light emitting device, wherein when the light emission is reduced, a light flux and / or a radiant flux emitted from the light emitting device in a main radiation direction is reduced.
[37] The method for driving a light emitting device according to [34], wherein the correlated color temperature T_SSL(K) increased
A method of driving a light emitting device that increases a light flux and / or a radiation flux emitted in a main radiation direction from the light emitting device when the light is emitted.
[38] The driving method of the light emitting device according to [34], wherein the distance D from the blackbody radiation locus is_uvSSL
A method of driving a light emitting device that reduces a luminous flux and / or a radiant flux emitted from the light emitting device in a main radiation direction when the light emitting device is reduced.
[39] The method for driving a light emitting device according to any one of [27] to [38],
  φ_SSL(Λ) is further supplied so as to satisfy the following conditions I-IV.
Driving method.
Condition I:
  CIE 1976 L of the following 15 types of modified Munsell color charts # 01 to # 15 assuming that illumination by light emitted in the radiation direction is mathematically assumed.^*a^*b^*A in color space^*Value, b^*Value is a^* _nSSL, B^* _nSSL(Where n is a natural number from 1 to 15)
  Correlated color temperature T of light emitted in the emission direction_SSLWith reference light selected according to (K)
CIE 1976 L of the 15 types of modified Munsell color charts when mathematically assuming the illumination of^*a^*b^*A in color space^*Value, b^*Value is a^* _nref, B^* _nref(However, n is from 1
15, a saturation degree difference ΔC_nBut
  −4.00 ≦ ΔC_n≤ 8.00 (n is a natural number from 1 to 15)
Meet.
Condition II:
  Average SAT of saturation difference represented by the following equation (3)_aveIs 0.50 ≦ SAT_aveSatisfies ≦ 4.00.
Condition III:
  The maximum value of the saturation difference is ΔC_max, The minimum value of the saturation difference is ΔC_minWhere | ΔC between the maximum value of the saturation difference and the minimum value of the saturation difference_max−ΔC_min|
  2.00 ≤ | ΔC_max−ΔC_min| ≦ 10.00
Meet.
  Where ΔC_n= √ ｛(a^* _nSSL)^Two+ (B^* _nSSL)^Two｝ -√ ｛(a^* _nref)^Two+ (B^* _nref)^Two｝.
  15 types of modified Munsell color chart
  # 01 7.5 P 4/10
  # 02 10 PB 4/10
  # 03 5 PB 4/12
  # 04 7.5 B5 / 10
  # 05 10 BG 6/8
  # 06 2.5 BG 6/10
  # 07 2.5 G 6/12
  # 08 7.5 GY 7/10
  # 09 2.5 GY 8/10
  # 10 5 Y 8.5 / 12
  # 11 10 YR7 / 12
  # 125 YR7 / 12
  # 13 10 R 6/12
  # 145 R4 / 14
  # 15 7.5 RP 4/12
Condition IV:
  The CIE 1976 L of the above-mentioned 15 types of modified Munsell color chart when the illumination by the light emitted in the radiation direction is mathematically assumed.^*a^*b^*The hue angle in the color space is θ_nSSL(Degree) (ta
Where n is a natural number from 1 to 15)
  Correlated color temperature T of light emitted in the emission direction_SSLWith reference light selected according to (K)
CIE 1976 L of the 15 types of modified Munsell color charts when mathematically assuming the illumination of^*a^*b^*The hue angle in the color space is θ_nref(Degrees) (where n is a natural number from 1 to 15)
The absolute value of the hue angle difference | Δh_n|
  0.00 degrees ≤ | Δh_n| ≤ 12.50 degrees (n is a natural number from 1 to 15)
Meet.
  Where Δh_n= Θ_nSSL−θ_nrefAnd
[40] An illumination object preparing step for preparing an object, and M (M is a natural number of 2 or more) light-emitting regions are present therein, and a blue semiconductor light-emitting element, a green phosphor, and a red light are provided in at least one light-emitting region. An illumination step of illuminating an object with light emitted from a light emitting device including a phosphor as a light emitting element, comprising:
  In the illumination step, when the light emitted from the light emitting device illuminates the target, the light measured at the position of the target illuminates so as to satisfy the following conditions 1 and conditions I to IV.
Condition 1:
  Distance D of light measured at the position of the object from the blackbody radiation locus defined by ANSI C78.377_uvSSLIs -0.0220 ≤ D_uvSSL  ≦ −0.0070.
Condition I:
CIE 1976 L of the following 15 types of modified Munsell color charts # 01 to # 15 when illumination by light measured at the position of the object is mathematically assumed.^*a^*b^*A in color space^*Value, b^*Value is a^* _nSSL, B^* _nSSL(Where n is a natural number from 1 to 15)
  Correlated color temperature T of light measured at the position of the object_SSLReference light selected according to (K)
CIE 1976 L of the 15 types of modified Munsell color charts when the illumination by^*a^*b^*A in color space^*Value, b^*Value is a^* _nref, B^* _nref(However, n is 1
To a natural number of 15), the saturation degree difference ΔC_nBut
  −4.00 ≦ ΔC_n≤ 8.00 (n is a natural number from 1 to 15)
Meet.
Condition II:
  Average SAT of saturation difference represented by the following equation (3)_aveIs 0.50 ≦ SAT_aveSatisfies ≦ 4.00.
Condition III:
  The maximum value of the saturation difference is ΔC_max, The minimum value of the saturation difference is ΔC_minWhere | ΔC between the maximum value of the saturation difference and the minimum value of the saturation difference_max−ΔC_min|
  2.00 ≤ | ΔC_max−ΔC_min| ≦ 10.00
Meet.
  Where ΔC_n= √ ｛(a^* _nSSL)^Two+ (B^* _nSSL)^Two｝ -√ ｛(a^* _nref)^Two+ (B^* _nref)^Two｝.
  15 types of modified Munsell color chart
  # 01 7.5 P 4/10
  # 02 10 PB 4/10
  # 03 5 PB 4/12
  # 04 7.5 B5 / 10
  # 05 10 BG 6/8
  # 06 2.5 BG 6/10
  # 07 2.5 G 6/12
  # 08 7.5 GY 7/10
  # 09 2.5 GY 8/10
  # 10 5 Y 8.5 / 12
  # 11 10 YR7 / 12
  # 125 YR7 / 12
  # 13 10 R 6/12
  # 145 R4 / 14
  # 15 7.5 RP 4/12
Condition IV:
  The CIE 1976 L of the above-mentioned 15 types of modified Munsell color charts when mathematically assuming illumination by light measured at the position of the object.^*a^*b^*The hue angle in the color space is θ_nSSL(Every time)(
Where n is a natural number from 1 to 15)
  Correlated color temperature T of light measured at the position of the object_SSLReference light selected according to (K)
CIE 1976 L of the 15 types of modified Munsell color charts when the illumination by^*a^*b^*The hue angle in the color space is θ_nref(Degrees) (where n is a natural number from 1 to 15)
, The absolute value of the hue angle difference | Δh_n|
  0.00 degrees ≤ | Δh_n| ≤ 12.50 degrees (n is a natural number from 1 to 15)
Meet.
  Where Δh_n= Θ_nSSL−θ_nrefAnd
[41] The illumination method according to [40], wherein the spectral distribution of light emitted from each light emitting element reaching the position of the target is φ._SSLN (λ) (N is 1 to M), measured at the position of the object
Specified light spectral distribution φ_SSL(Λ) is
At the time
  All φ_SSLN (λ) (where N is 1 to M) satisfies condition 1 and conditions I to IV.
Lighting method
[42] The illumination method according to [40] or [41], wherein at least one of the M light-emitting regions is electrically driven independently of another light-emitting region to illuminate the other light-emitting regions. Method. [43] The lighting method according to [42], wherein all of the M light-emitting regions are electrically independently driven and illuminated with respect to the other light-emitting regions.
[44] The illumination method according to any one of [40] to [43], wherein the average SAT of the difference in saturation represented by the formula (3) is used._ave, Correlated color temperature T_SSL(K) and the distance D from the blackbody radiation locus_uvSSLChanging at least one selected from the group consisting of:
.
[45] The illumination method according to [44], wherein the average SAT of the difference in saturation represented by the formula (3) is used._ave, Correlated color temperature T_SSL(K) and the distance D from the blackbody radiation locus_uvSSLFrom the group consisting of
An illumination method, wherein when at least one selected is changed, the illuminance on the target object is independently controlled.
[46] The illumination method according to [45], wherein the average SAT of the difference in saturation represented by the equation (3) is used._ave, Correlated color temperature T_SSL(K) and the distance D from the blackbody radiation locus_uvSSLFrom the group consisting of
An illumination method in which the illuminance on the target object is not changed when at least one selected is changed.
[47] The illumination method according to [45], wherein the average SAT of the saturation difference represented by the formula (3) is used._aveAn illumination method for reducing the illuminance on the target object when the number is increased.
[48] The illumination method according to [45], wherein the correlated color temperature T_SSLWhen (K) is increased
And an illumination method for increasing the illuminance on the object.
[49] The illumination method according to [45], wherein the distance D from the blackbody radiation locus is_uvSSLReduced
A lighting method for reducing the illuminance on the object when the lighting is performed.
[50] The lighting method according to any one of [40] to [49], wherein L is a maximum distance formed by any two points on a virtual outer periphery enclosing the whole of the different light-emitting regions that are closest to each other. When the distance between the device and the illumination target is H,
5 × L ≦ H ≦ 500 × L
An illumination method for setting the distance H such that

According to the present invention, in a "light-emitting device capable of realizing a natural, lively, highly visible, comfortable, visible color, and the appearance of an object", it achieves both good color appearance and high light source efficiency. it can.
The convenience realized by the present invention is as follows.
That is, although the optimal illumination differs depending on age, gender, country, etc., and what kind of space is illuminated for what purpose, the light emitting device of the present invention and the driving method of the light emitting device of the present invention are different. When used, the illumination condition considered more optimal can be easily selected from the variable range.

In one embodiment where the spectral distribution is φ _SSL (λ), the parameters φ _SSL-BM-max , λ _SSL-BM-max , φ _SSL-BG-min , λ _SSL-BG-min , φ _SSL-RM-max , λ _SSL-RM-max, which is a graph showing the relation φ _{SSL-R L-max,} and λ _SSL-RL-max. It is a figure which shows the integration range of parameter _Acg (when CCT is 5000K or more). It is a figure showing the integration range of parameter A _cg (when CCT is less than 5000K). A semiconductor LED having a peak wavelength of 410 nm is included, emitted from a package LED having a narrow-band green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. FIG. 11 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color patches are plotted in the case where the correction is performed and the case where the color is illuminated with reference light (Comparative Experimental Example 1). A semiconductor LED having a peak wavelength of 410 nm is included, emitted from a package LED having a narrow-band green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. FIG. 14 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts are plotted in a case where the correction is performed and a case where illumination is performed with reference light (Comparative Experimental Example 2). A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with reference light (Reference Experimental Example 1). . A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with reference light (Experimental example 1). A semiconductor light emitting element having a peak wavelength of 460 nm is included and emitted from a package LED having a broadband green phosphor and a red phosphor, and the spectral distribution is assumed to illuminate 15 types of modified Munsell color chips, and the LED is illuminated by the LED. FIG. 10 is a diagram illustrating a CIELAB color space in which both a ^* values and b ^* colors of the 15 types of modified Munsell color charts in the case of illuminating with reference light are plotted (Experimental Example 9). A semiconductor light emitting element having a peak wavelength of 460 nm is included and emitted from a package LED having a broadband green phosphor and a red phosphor, and the spectral distribution is assumed to illuminate 15 types of modified Munsell color chips, and the LED is illuminated by the LED. FIG. 18 is a diagram showing a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts in the case of illuminated with reference light are plotted (Experimental Example 18). A semiconductor light-emitting element having a peak wavelength of 452.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. FIG. 20 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts when illuminated and when illuminated with reference light are plotted (Experimental Example 20). A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both the a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with reference light (Experimental example 40). A semiconductor light-emitting element having a peak wavelength of 452.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. FIG. 50 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts when illuminated and illuminated with reference light are plotted (Experimental Example 47). A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. FIG. 50 is a diagram illustrating a CIELAB color space in which the a ^* value and the b ^* color of the 15 types of modified Munsell color patches are plotted together when illuminated and when illuminated with reference light (Experimental Example 49). A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both the a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with the reference light (Experimental example 50). A semiconductor light-emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. FIG. 10 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts when illuminated and illuminated with reference light are plotted together (Comparative Experimental Example 3). . A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. FIG. 10 is a diagram showing a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts when illuminated and when illuminated with reference light are plotted (Comparative Experimental Example 4). . A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with reference light (Comparative Experimental Example 5). . Spectral distribution, which is assumed to illuminate 15 kinds of modified Munsell color chips, is emitted from a package LED containing a semiconductor light emitting element having a peak wavelength of 457.5 nm and provided with a yellow phosphor and a red phosphor, and illuminated by the LED FIG. 14 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts are plotted in a case where the correction is performed and a case where illumination is performed with reference light (Comparative Experimental Example 7). Spectral distribution that contains a semiconductor light emitting element having a peak wavelength of 455 nm, is emitted from a package LED having a narrow band green phosphor and a red phosphor, and is supposed to illuminate 15 types of modified Munsell color chips, and is illuminated by the LED. FIG. 10 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color patches are plotted when the illumination is performed and when the illumination is illuminated with reference light (Comparative Experimental Example 10). A semiconductor LED having a peak wavelength of 447.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. FIG. 14 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts when illuminated and when illuminated with reference light are plotted (Comparative Experimental Example 15). . A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with reference light (Comparative Experimental Example 16). . A semiconductor LED having a peak wavelength of 450 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips, and is illuminated by the LED. FIG. 19 is a diagram showing a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts when illuminated with reference light are plotted (Comparative Experimental Example 18). A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both the a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with reference light (Comparative Experimental Example 19). . A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with reference light (Comparative Experimental Example 22). . A semiconductor light emitting element having a peak wavelength of 457.5 nm is included, emitted from a package LED having a broadband green phosphor and a red phosphor, and is assumed to illuminate 15 types of modified Munsell color chips. It is a figure which shows the CIELAB color space which plotted both the a ^* value and b ^* color of the said 15 types of modified Munsell color charts when illuminated and when illuminated with reference light (Comparative Experimental Example 23). . A semiconductor LED having a peak wavelength of 465 nm is included and emitted from a package LED provided with a broadband green phosphor and a red phosphor. The spectral distribution is assumed to illuminate 15 types of modified Munsell color chips, and the LED is illuminated by the LED. FIG. 27 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts in the case of being illuminated with reference light are plotted (Comparative Experimental Example 26). A semiconductor LED having a peak wavelength of 465 nm is included and emitted from a package LED provided with a broadband green phosphor and a red phosphor. The spectral distribution is assumed to illuminate 15 types of modified Munsell color chips, and the LED is illuminated by the LED. FIG. 28 is a diagram illustrating a CIELAB color space in which both the a ^* value and the b ^* color of the 15 types of modified Munsell color charts when illuminated with reference light are plotted (Comparative Experimental Example 27). It is a figure which shows arrangement | positioning of the light emission area | region of the package LED used by Example 1 and a comparative example. In the first embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 3: 0, the case where illumination is performed using the spectral distribution (solid line), and the calculation reference light corresponding to the spectral distribution. FIG. 10 is a diagram showing a CIELAB color space in which both a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted (drive point A), assuming illumination (dotted lines). In the first embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 2: 1, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 9 is a diagram showing a CIELAB color space in which both a ^* and b ^* values of the 15 types of modified Munsell color charts are plotted, assuming illumination (dotted lines). In the first embodiment, this corresponds to the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is set to 1.5: 1.5, the case where illumination is performed with the spectral distribution (solid line), and the case where the spectral distribution is used. FIG. 9 is a diagram showing a CIELAB color space in which both the a ^* value and the b ^* value of the 15 types of modified Munsell color charts are plotted, assuming a case where illumination is performed with reference light for calculation (dotted line) (driving point C). . In the first embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 1: 2, the case where illumination is performed with the spectral distribution (solid line), and the calculation reference light corresponding to the spectral distribution. FIG. 10 is a diagram showing a CIELAB color space in which both a ^* value and b ^* value of the 15 types of modified Munsell color patches are plotted (drive point D), assuming illumination (dotted line). In the first embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 0: 3, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 10 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted together (drive point E) assuming illumination (dotted lines). The chromaticity from the driving points A to E in the first embodiment is shown on the CIE1976u'v 'chromaticity diagram. The two-dot chain line in the drawing is the range of D _uv that satisfies the condition 1 in the present invention. FIG. 9 is a diagram illustrating an arrangement of light emitting areas of a package LED used in a second embodiment. In Example 2, the spectral distribution when the luminous flux ratio of the light-emitting region 21, the light-emitting region 22, and the light-emitting region 23 is 3: 0: 0, the case where illumination is performed with the spectral distribution (solid line), and the case where FIG. 9 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color charts are plotted together, assuming illumination (dotted lines) with the corresponding reference light for calculation (drive point). A). In the second embodiment, the spectral distribution when the luminous flux ratio of the light emitting region 21, the light emitting region 22, and the light emitting region 23 is set to 0: 3: 0, the case where illumination is performed with the spectral distribution (solid line), and the case where FIG. 9 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color charts are plotted together, assuming illumination (dotted lines) with the corresponding reference light for calculation (drive point). B). In the second embodiment, the spectral distribution when the luminous flux ratio of the light emitting region 21, the light emitting region 22, and the light emitting region 23 is set to 0: 0: 3, the case where illumination is performed with the spectral distribution (solid line), and the case where FIG. 9 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color charts are plotted together, assuming illumination (dotted lines) with the corresponding reference light for calculation (drive point). C). In the second embodiment, the spectral distribution when the luminous flux ratio of the light emitting region 21, the light emitting region 22, and the light emitting region 23 is set to 1: 1: 1 and when the illumination is performed using the spectral distribution (solid line), FIG. 9 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color charts are plotted together, assuming illumination (dotted lines) with the corresponding reference light for calculation (drive point). D). The chromaticity from the driving points A to D in the second embodiment is shown on the CIE1976u'v 'chromaticity diagram. The two-dot chain line in the drawing is the range of D _uv that satisfies the condition 1 in the present invention. FIG. 14 is a diagram illustrating an arrangement of light emitting areas of a lighting system used in a third embodiment. In the third embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 90: 0, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 10 is a diagram showing a CIELAB color space in which both a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted (drive point A), assuming illumination (dotted lines). In the third embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 70:20, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 9 is a diagram showing a CIELAB color space in which both the a ^* value and the b ^* value of the 15 types of modified Munsell color charts are plotted (drive point B), assuming illumination (dotted lines). In the third embodiment, the spectral distribution when the luminous flux ratio of the light emitting region 31 and the light emitting region 32 is 45:45, the case where the light is illuminated with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 9 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted together (drive point C) assuming illumination (dotted lines). In the third embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 30:60, the case where illumination is performed using the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution. FIG. 10 is a diagram showing a CIELAB color space in which both a ^* value and b ^* value of the 15 types of modified Munsell color patches are plotted (drive point D), assuming illumination (dotted line). In the third embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 0:90, the case where the light is illuminated by the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 10 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted together (drive point E) assuming illumination (dotted lines). The chromaticity from the driving points A to E in the third embodiment is shown on the CIE1976u'v 'chromaticity diagram. The two-dot chain line in the drawing is the range of D _uv that satisfies the condition 1 in the present invention. In the fourth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 90: 0, the case where illumination is performed using the spectral distribution (solid line), and the calculation reference light corresponding to the spectral distribution. FIG. 10 is a diagram showing a CIELAB color space in which both a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted (drive point A), assuming illumination (dotted lines). In the fourth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 70:20, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 9 is a diagram showing a CIELAB color space in which both a ^* and b ^* values of the 15 types of modified Munsell color charts are plotted, assuming illumination (dotted lines). In the fourth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 49:41, the case where illumination is performed using the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 9 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted together (drive point C) assuming illumination (dotted lines). In the fourth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 30:60, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 10 is a diagram showing a CIELAB color space in which both a ^* value and b ^* value of the 15 types of modified Munsell color patches are plotted (drive point D), assuming illumination (dotted line). In the fourth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 31 and the light emitting region 32 is 0:90, the case where illumination is performed using the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 10 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted together (drive point E) assuming illumination (dotted lines). The chromaticity from drive points A to E in the fourth embodiment is shown on the CIE1976u'v 'chromaticity diagram. The two-dot chain line in the drawing is the range of D _uv that satisfies the condition 1 in the present invention. FIG. 14 is a diagram illustrating an arrangement of light emitting areas of a light emitting device (a pair of package LEDs) used in Example 5. In the fifth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 41 and the light emitting region 42 is 9: 0, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 10 is a diagram showing a CIELAB color space in which both a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted (drive point A), assuming illumination (dotted lines). In the fifth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 41 and the light emitting region 42 is 7: 2, the case where illumination is performed using the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 9 is a diagram showing a CIELAB color space in which both a ^* and b ^* values of the 15 types of modified Munsell color charts are plotted, assuming illumination (dotted lines). In Example 5, the spectral distribution when the luminous flux ratio between the light emitting region 41 and the light emitting region 42 is 4.5: 4.5, the case where illumination is performed with the spectral distribution (solid line), and the case where the spectral distribution corresponds to the spectral distribution. FIG. 9 is a diagram showing a CIELAB color space in which both the a ^* value and the b ^* value of the 15 types of modified Munsell color charts are plotted, assuming a case where illumination is performed with reference light for calculation (dotted line) (driving point C). . In the fifth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 41 and the light emitting region 42 is 2: 7, the case where illumination is performed with the spectral distribution (solid line), and the calculation reference light corresponding to the spectral distribution. FIG. 10 is a diagram showing a CIELAB color space in which both a ^* value and b ^* value of the 15 types of modified Munsell color patches are plotted (drive point D), assuming illumination (dotted line). In the fifth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 41 and the light emitting region 42 is 0: 9, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 10 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted together (drive point E) assuming illumination (dotted lines). The chromaticity from the driving points A to E in the fifth embodiment is shown on the CIE1976u'v 'chromaticity diagram. The two-dot chain line in the drawing is the range of D _uv that satisfies the condition 1 in the present invention. FIG. 14 is a diagram illustrating an arrangement of light emitting regions of a package LED used in a sixth embodiment. In the sixth embodiment, when the radiant flux ratio between the light-emitting region 51 and the light-emitting region 52 is 16: 0, the spectral distribution of the light-emitting region, the case of illumination with the spectral distribution (solid line), and the calculation reference corresponding to the spectral distribution. It is a figure which shows the CIELAB color space which plotted both the a ^* value and the b ^* value of the said 15 types of modified Munsell color charts, respectively, assuming the case of lighting (dotted line) (drive point A). In the sixth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 51 and the light emitting region 52 is 4:12, the case where illumination is performed using the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 9 is a diagram showing a CIELAB color space in which both a ^* and b ^* values of the 15 types of modified Munsell color charts are plotted, assuming illumination (dotted lines). In the sixth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 51 and the light emitting region 52 is 3:13, the case where illumination is performed with the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 9 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted together (drive point C) assuming illumination (dotted lines). In the sixth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 51 and the light emitting region 52 is 1:15, the case where illumination is performed using the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution FIG. 10 is a diagram showing a CIELAB color space in which both a ^* value and b ^* value of the 15 types of modified Munsell color patches are plotted (drive point D), assuming illumination (dotted line). In the sixth embodiment, the spectral distribution when the luminous flux ratio between the light emitting region 51 and the light emitting region 52 is 0:16, the case where illumination is performed using the spectral distribution (solid line), and the reference light for calculation corresponding to the spectral distribution. FIG. 10 is a diagram showing a CIELAB color space in which a ^* values and b ^* values of the 15 types of modified Munsell color patches are plotted together (drive point E) assuming illumination (dotted lines). The chromaticity from the driving points A to E in the sixth embodiment is shown on the CIE1976u'v 'chromaticity diagram. The two-dot chain line in the drawing is the range of D _uv that satisfies the condition 1 in the present invention. In the comparative example, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 3: 0, the case where illumination is performed with the spectral distribution (solid line), and the case where the reference light for calculation corresponding to the spectral distribution is used. It is a figure which shows the CIELAB color space which plotted both the a ^* value and the b ^* value of the said 15 types of modified Munsell color charts, respectively, assuming the case of lighting (dotted line) (driving point A). In the comparative example, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 2: 1 and when the illumination is performed with the spectral distribution (solid line), and when the reference light for calculation corresponding to the spectral distribution is used. It is a figure which shows the CIELAB color space which plotted both the a ^* value and the b ^* value of the said 15 types of modified Munsell color charts, respectively, assuming illumination (dotted line) (driving point B). In the comparative example, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 1.5: 1.5, the illumination with the spectral distribution (solid line), and the calculation corresponding to the spectral distribution FIG. 10 is a diagram illustrating a CIELAB color space in which a ^* value and b ^* value of the 15 types of modified Munsell color patches are plotted together (drive point C), assuming illumination with reference light (dotted line). In the comparative example, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 1: 2, the case where the light is illuminated with the spectral distribution (solid line), and the calculation reference light corresponding to the spectral distribution. It is a figure which shows the CIELAB color space which plotted both the a ^* value and the b ^* value of the said 15 types of modified Munsell color charts, respectively, assuming illumination (dotted line) (driving point D). In the comparative example, the spectral distribution when the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 0: 3, the case where illumination is performed with the spectral distribution (solid line), and the case where the reference light for calculation corresponding to the spectral distribution is used. It is a figure which shows the CIELAB color space which plotted both the a ^* value and the b ^* value of the said 15 types of modified Munsell color charts, respectively, assuming illumination (dotted line) (driving point E). The chromaticity from the driving points A to E in the comparative example is shown on the CIE1976u'v 'chromaticity diagram. The two-dot chain line in the drawing is the range of D _uv that satisfies the condition 1 in the present invention. FIG. 3 is a diagram illustrating a light emitting region included in the light emitting device of the present invention.

Hereinafter, the present invention will be described in detail, but the present invention is not limited to the following embodiments, and can be implemented with various modifications within the scope of the gist.
In the first to third embodiments of the present invention, the invention is specified by the light in the “main radiation direction” of the light emitted from the light emitting device. Therefore, a light-emitting device that can emit light including light in the “main radiation direction” that satisfies the requirements of the present invention belongs to the scope of the present invention.
Further, in the lighting method according to the fourth embodiment of the present invention, when the light emitted from the light emitting device used in the lighting method illuminates the object, the light at the position where the object is illuminated is used. Is specified. Therefore, a lighting method using a light emitting device that can emit light at a “position where the object is illuminated” that satisfies the requirements of the present invention belongs to the scope of the present invention.

Here, the “principal radiant direction” in the first to third embodiments of the present invention has a suitable range and a suitable direction in accordance with the use condition of the light emitting device. Indicates the direction in which light is being emitted.
For example, the direction in which the luminous intensity or luminance of the light emitting device is maximum or maximum may be used.
In addition, the direction may have a finite range including the direction in which the luminous intensity or luminance of the light emitting device is maximum or maximum.
Also, the direction may be a direction in which the radiant intensity or radiance of the light emitting device is maximum or maximum.
Further, the direction may have a finite range including the direction in which the radiation intensity or radiance of the light emitting device is maximum or maximum.

The following is a specific example.
When the light emitting device is a single light emitting diode (LED), a single package LED, a single LED module, a single LED bulb, a single combined lamp of a fluorescent lamp and a semiconductor light emitting element, a single combined lamp of an incandescent lamp and a semiconductor light emitting element, The main radiation direction may be the vertical direction of each light emitting device, within a finite solid angle including the vertical direction, for example, π (sr) at the maximum and π / 100 (sr) at the minimum.
An LED lighting device in which a light emitting device is provided with a lens, a reflection mechanism, and the like to the package LED and the like, and a lighting device in which a fluorescent lamp and a semiconductor light emitting element are embedded, so-called direct lighting applications, semi-direct lighting applications, and general diffusion. When the light distribution characteristics are applicable to lighting applications, direct / indirect lighting applications, semi-indirect lighting applications, and indirect lighting applications, the main radiation direction is limited to the vertical direction of each light emitting device, including the vertical direction. , For example, π (sr) at the maximum and π / 100 (sr) at the minimum. Further, the direction may be a direction in which the luminous intensity or luminance of the light emitting device is maximum or maximum. Further, it may be within a finite solid angle including a direction in which the luminous intensity or luminance of the light emitting device is maximum or maximum, for example, π (sr) at the maximum and π / 100 (sr) at the minimum. Further, the direction may be a direction in which the radiation intensity or radiance of the light emitting device is maximum or maximum. Further, it may be within a finite solid angle including a direction in which the radiation intensity or radiance of the light emitting device is maximum or maximum, for example, π (sr) at the maximum and π / 100 (sr) at the minimum.
When the light emitting device is a lighting system equipped with a plurality of lighting devices in which the LED lighting device and the fluorescent lamp are embedded, the main radiation direction is a vertical direction of a planar center of each light emitting device, a finite including the vertical direction. Within a solid angle, for example, it may be at most π (sr) and at least π / 100 (sr). Further, the direction may be a direction in which the luminous intensity or luminance of the light emitting device is maximum or maximum. Further, it may be within a finite solid angle including a direction in which the luminous intensity or luminance of the light emitting device is maximum or maximum, for example, π (sr) at the maximum and π / 100 (sr) at the minimum. Further, the direction may be a direction in which the radiation intensity or radiance of the light emitting device is maximum or maximum. Further, it may be within a finite solid angle including a direction in which the radiation intensity or radiance of the light emitting device is maximum or maximum, for example, π (sr) at the maximum and π / 100 (sr) at the minimum.
In order to measure the spectral distribution of the light emitted in the main radiation direction from the light emitting device, it is preferable to measure at a distance where the illuminance at the measurement point becomes a practical illuminance (150 lx or more and 5000 lx or less as described later).

In the present specification, the reference light defined by the CIE used for calculation when estimating the appearance of mathematical colors may be referred to as reference light, calculation reference light, calculation reference light, and the like. is there. On the other hand, the experimental reference light used in the actual visual comparison, that is, the incandescent light including the tungsten filament is sometimes referred to as the reference light, the experimental reference light, or the experimental reference light. The high R _a and light the high R _i is expected to be a color appearance which is close to the optical criteria, for example, a LED light source, the light used as an alternative light laboratory reference light in Comparative visual experiments, Reference light, experimental pseudo-reference light, and experimental pseudo-reference light may be used. In addition, light that has been studied mathematically or experimentally may be referred to as test light with respect to reference light.

The light emitting device according to the first embodiment of the present invention includes M light emitting regions (M is a natural number of 2 or more). In this specification, a light-emitting region that emits light having an equivalent spectral distribution while allowing for general variation in a manufacturing process is referred to as a light-emitting region of the same type. In other words, even if the light emitting regions are physically separated and separated from each other, the light emitting regions are the same kind of light emitting regions when emitting light having an equivalent spectral distribution after allowing general variations in the manufacturing process. . In other words, the light-emitting device according to the first embodiment of the present invention has two or more types of light-emitting regions that emit light with different spectral distributions.
Further, a blue semiconductor light emitting element, a green phosphor, and a red phosphor are provided as light emitting elements in at least one of the plurality of types of light emitting areas. As long as at least one light-emitting region includes a blue semiconductor light-emitting element, a green phosphor, and a red phosphor as light-emitting elements, the light-emitting elements included in each light-emitting region are not limited. As the light emitting element other than the semiconductor light emitting element and the phosphor, any element may be used as long as it converts various kinds of input energy into energy of electromagnetic radiation and includes visible light of 380 nm to 780 nm in the electromagnetic radiation energy. For example, a heat filament, a fluorescent tube, a high-pressure sodium lamp, a laser, a second harmonic generation (SHG) source, etc., capable of converting electric energy can be exemplified.
The light-emitting device according to the first embodiment of the present invention includes a blue semiconductor light-emitting element that is a light-emitting element, a green phosphor, and a light-emitting region including a red phosphor, if a plurality of light-emitting regions are present, other than that. The configuration is not particularly limited. The light emitting region may be a single semiconductor light emitting element provided with a lead wire or the like as an energizing mechanism, or a packaged LED or the like further provided with a heat radiating mechanism or the like and integrated with a phosphor or the like.
In addition, the light emitting device may be an LED module in which one or more packaged LEDs are provided with a more robust heat dissipation mechanism, and generally include a plurality of packaged LEDs. Further, an LED lighting device in which a lens, a light reflecting mechanism, and the like are added to a package LED or the like may be used. Further, the lighting system may support a large number of LED lighting fixtures or the like and finish the lighting system to illuminate the target object. The light emitting device according to this embodiment includes all of them.

In the light emitting device according to the first embodiment of the present invention, the spectral distribution of light emitted from each light emitting region is φ _SSL N (λ) (N is 1 to M), and the light is emitted from the light emitting device in the radiation direction. The spectral distribution φ _SSL (λ) of all the light
And This will be described with reference to FIG.
The light emitting device 100 illustrated in FIG. 74 is one mode of the light emitting device according to the first embodiment of the present invention. The light-emitting device 100 shows a case where M = 5 in the above equation, and five (i.e., five types) light-emitting regions of light-emitting regions 1 to 5 are inherent. Each light-emitting region includes a packaged LED 6 mounted with a blue semiconductor light-emitting element, a green phosphor, and a red phosphor as a light-emitting element.
The spectral distribution of light emitted from the light emitting region 1 is φ _SSL 1 (λ), the spectral distribution of light emitted from the light emitting region 2 is φ _SSL 2 (λ), and the spectral distribution of light emitted from the light emitting region 3 is φ _SSL 1 (λ). A light emitting device is represented by φ _SSL 3 (λ), the spectral distribution of light emitted from the light emitting region 4 is φ _SSL 4 (λ), and the spectral distribution of light emitted from the light emitting region 5 is φ _SSL 5 (λ). The spectral distribution φ _SSL (λ) of all light emitted in the radiation direction from
It is expressed as That is, when N is 1 to M,
It can be expressed as.

In the present invention, the light source efficiency is improved, and the color appearance is realized while realizing a natural, lively, highly visible, comfortable, color appearance and the appearance of an object as viewed outdoors. It can be variable. Specifically, the above φ _SSL (λ) is the amount of light emitted from each light emitting region and / or
Alternatively, the present invention relates to a light-emitting device in which a light-emitting region capable of satisfying a specific condition by changing a radiation flux amount is included.
Hereinafter, the present invention will be described in detail.

  The present inventor has found that even in a general indoor illuminance environment, as seen in an outdoor high illuminance environment, a natural, lively, highly visible, comfortable, color appearance, object appearance can be obtained. A radiometric property and a photometric property common to a spectrum or a spectral distribution that can realize the following are found. Further, the color appearance of a color chart having a specific spectral reflection characteristic when assuming illumination with light having the spectrum or spectral distribution is compared with the case where illumination with reference light for calculation is assumed. The present inventors have found from a colorimetric point of view whether or not the above object can be realized when it changes (or does not change), and arrived at the invention as a whole. In addition, the present invention has been improved from the viewpoint of light source efficiency, and has reached a light emitting device having high light source efficiency. Further, they have found that the appearance of color can be made variable when a plurality of light emitting regions are present.

<Light emission of light emitting element alone and light emission of light emitting device>
The light emitting device according to the present embodiment has a plurality of light emitting regions, for example, a packaged LED including a semiconductor light emitting element and a phosphor, or an LED bulb further including a packaged LED, and further, such a light emitting device. It may be a light emitting module, a light emitting system, or the like in which a light emitting device is integrated. Here, a member / material that constitutes the light emitting device according to the present embodiment and emits light as a result of self-emission or excitation from another will be referred to as a light emitting element. Therefore, in this embodiment, the semiconductor light emitting element, the phosphor, and the like may be light emitting elements.

By the way, the light emitted from the light emitting device according to the present embodiment in the main radiation direction is based on the superposition of the light emission of the light emitting elements, but is not always a simple superposition due to various factors. For example, mutual absorption of light between light emitting elements is a major factor. In addition, the spectral distribution of the light emitting device may greatly change from a simple superposition of the spectral distribution of the light emitting element due to the spectral transmission characteristics of the lens / filter or the like that can be included in the light emitting device according to this embodiment. In addition, the spectral distribution of the light emitting device may change from a simple superposition of the spectral distribution of the light emitting element due to the spectral reflection characteristics of the light emitting device constituent members near the light emitting element, for example, the reflection film.
Furthermore, due to the “difference” between the widely used measurement environment of the light-emitting element alone and the general measurement environment of the light-emitting device, the spectral distribution of the light-emitting device cannot be simply derived from the superposition of the spectral distribution of the light-emitting device. It needs to be considered.

Therefore, when the light emitting element in the light emitting device according to the present embodiment is defined, the following is performed.
The purple semiconductor light emitting device was characterized by a peak wavelength λ _CHIP-VM-max when driven by a single pulse current.
The blue semiconductor light emitting device was characterized by a dominant wavelength λ _CHIP-BM-dom when the light emitting device alone was driven by pulse current.
The phosphor material has a light emission peak wavelength when the material alone is excited by light (described as λ _PHOS-GM-max for a green phosphor and λ _PHOS-RM-max for a red phosphor) and its emission. It was characterized by the full width at half maximum of the spectral distribution (W _PHOS-GM-fwhm for the green phosphor and W _PHOS-RM-fwhm for the red phosphor).

On the other hand, when characterizing the spectral distribution φ _SSL (λ) of the light emitting device itself according to the present embodiment, it was characterized by the following indices based on the characteristics during continuous energization.
Specifically, the maximum value of the spectral intensity φ _SSL-BM-max in the range of 430 nm to 495 nm, the wavelength λ _SSL-BM-max that provides this,
The minimum value of the spectral intensity φ _SSL-BG-min in the range of 465 nm to 525 nm, the wavelength λ _SSL-BG-min that provides this,
A maximum value λ _SSL-RM-max of the spectral intensity in the range of 590 nm or more and 780 nm or less, a wavelength λ _SSL-RM-max for providing the maximum value,
Furthermore, the maximum wavelength maximum value φ _{SSL-RL-max of the} normalized spectral distribution S _SSL (λ) derived from the spectral distribution φ _SSL (λ) in the range of 380 nm to 780 nm used in the definition of the index A _cg described below. Λ _SSL-RL-max , which gives This relationship is shown in FIG.
Therefore, for example, λ _CHIP-BM-dom generally differs from λ _SSL-BM-max , and λ _PHOS-RM-max also generally differs from λ _SSL-RM-max . On the other hand, λ _SSL-RL-max often takes the same value as λ _SSL-RM-max .

<Indicator A _cg >
The index A _cg is defined below, as disclosed in Japanese Patent Nos. 5,252,107 and 5,257,538.
When the light emitted from the light emitting device according to the present embodiment in the main radiation direction is measured, the spectral distributions of the calculation reference light and the test light, which become different color stimuli, are φ _ref (λ) and φ _SSL (λ), respectively. And the color matching functions are x (λ), y (λ), z (λ), and the tristimulus values corresponding to the calculation reference light and the test light are (X _ref , Y _ref , Z _ref ), (X _SSL , Y _SSL , Z _SSL ). Here, regarding the reference light for calculation and the test light, the following holds true, where k is a constant.
Y _ref = k∫φ _ref (λ) · y (λ) dλ
Y _SSL = k∫φ _SSL (λ) · y (λ) dλ
Here, the normalized spectral distribution obtained by normalizing the spectral distribution of the reference light for calculation and the test light by the respective Y is represented by S _ref (λ) = φ _ref (λ) / Y _ref
S _SSL (λ) = φ _SSL (λ) / Y _SSL
And the difference between the normalized reference light spectral distribution and the normalized test light spectral distribution is defined as ΔS (λ) = S _ref (λ) −S _SSL (λ)
And Here, the index A _cg is derived as follows.

Here, the upper and lower limit wavelengths of each integral are respectively Λ1 = 380 nm
Λ2 = 495 nm
Λ3 = 590 nm
It is.

$ 4 is defined separately in the following two cases. First, in the standardized test light spectral component S _SSL (λ), the wavelength giving the maximum value of the longest wavelength within 380 nm to 780 nm is λ _SSL-RL-max (nm), and the standardized spectral intensity is S _SSL (λ _{SSL -RL-max} ), the wavelength on the longer wavelength side than λ _SSL-RL-max and having the intensity of S _SSL (λ _SSL-RL-max ) / 2 is Λ4.
If such a wavelength does not exist in the range up to 780 nm, Λ4 is 780 nm.
It is.

<Narrowband / Wideband>
The narrow-band light-emitting element according to the present embodiment has the same definition as described in Japanese Patent No. 5252107 and Japanese Patent No. 5257538. The width is 以下 or less of 115 nm, 95 nm, and 190 nm, which are the respective widths of the wavelength range from 495 nm to 590 nm and the long wavelength region (590 nm to 780 nm).
Conversely, the broadband light emitting element according to the present embodiment means that the full width at half maximum of the light emitting element is a short wavelength region (380 nm to 495 nm), an intermediate wavelength region (495 nm to 590 nm), and a long wavelength region (590 nm to 780 nm). It is wider than ／ of the region widths of 115 nm, 95 nm, and 190 nm. Therefore, a light emitting element having a full width at half maximum of about 77 nm or more in the short wavelength region, about 64 nm or more in the intermediate wavelength region, and about 127 nm or more in the long wavelength region is a broadband light emitting element.

<Light source chromaticity notation>
The chromaticity points of the light emitting device according to the present embodiment are specified as follows. The chromaticity derived from the spectral distribution of light emitted from the light emitting device in the main radiation direction can be discussed in, for example, a CIE 1931 (x, y) chromaticity diagram or a CIE 1976 (u ′, v ′) chromaticity diagram. It is. However, it is better to describe the position on the chromaticity diagram by using the correlated color temperature CCT and the deviation _{Duv. Therefore} , in this embodiment, the (u ′, (2/3) v ′) chromaticity diagram (CIE 1960 (u) , V) Chromaticity diagram).
Here, the deviation D _{uv according} to the present embodiment is an amount defined in ANSI C78.377, and is relative to the blackbody radiation locus in the (u ′, (2/3) v ′) chromaticity diagram. The closest distance is shown as an absolute value. The positive sign indicates that the chromaticity point of the light emitting device is located above the blackbody radiation locus (the side where v ′ is large), and the negative sign indicates that the chromaticity point of the light emitting device is below the blackbody radiation locus (v ′ is small). Side).

<Φ _SSL-BG-min / φ _SSL-BM-max and φ _SSL-BG-min / φ _SSL-RM-max >
φ _SSL-BG-min is mainly used for the long-wavelength tail of the spectral radiant flux originating from the emission of the blue semiconductor light-emitting element (the tail part where the spectral radiant flux intensity decreases) and the light emission of the light-emitting element responsible for the intermediate wavelength region. It appears at the portion where the short-wavelength tail (the tail portion where the spectral radiant flux intensity decreases) of the derived spectral radiant flux overlaps. In other words, φ _SSL (λ) -shaped recesses tend to occur in the range from 465 nm to 525 nm extending between the short wavelength region and the intermediate wavelength region.
In order to improve the saturation of the color appearance of the specific 15-corrected Munsell color chart mathematically derived, which will be described later, in a relatively uniform manner, φ _{SSL-BG-min is set} to a value within the range of 430 nm to 495 nm. normalized _{φ SSL-BG-min / φ} SSL-BM-max the maximum value of the intensity, and were normalized φ _SSL-BG-min at a maximum value of the spectral intensity at 780nm following range of 590 nm phi _{SSL- BG-min} / φ _SSL-RM-max needs to be carefully controlled. That is, in the light emitting device of the present embodiment, there are optimal ranges of φ _SSL-BG-min / φ _SSL-BM-max and φ _SSL-BG-min / φ _SSL-RM-max as described later. .

<Reference light, experimental reference light, test light>
In the present embodiment, the reference light defined by the CIE used for calculation when predicting the appearance of mathematical colors is described as reference light, calculation reference light, calculation reference light, and the like. On the other hand, experimental reference light used in actual visual comparison, that is, incandescent lamp light having a tungsten filament, and the like are described as reference light, experimental reference light, and experimental reference light. The high R _a and light the high R _i is expected to be a color appearance which is close to the optical criteria, for example, enclosing the ultraviolet semiconductor light emitting elements, also LED light source including a blue / green / red phosphor, the reference , The reference light for experiments, and the reference light for experiments. In addition, light that is mathematically or experimentally studied with respect to reference light may be referred to as test light.

<Quantification method of color appearance of lighting object>
In order to quantitatively evaluate the color appearance of an object illuminated with the light from the spectral distribution, mathematically, a color chart whose spectral reflection characteristics are clear is defined, and illumination with a reference light for calculation is assumed. It is preferable to compare the case where illumination with test light is assumed and use the “difference in color appearance” of the color chart as an index.

In general, test colors used in CRI can be an option, but the color charts of R ₁ to R ₈ used for deriving the average color rendering index and the like are medium-saturated color charts and high chroma It is not suitable for discussing the color saturation. Also, R ₁₂ from R ₉ is a high saturation of color chart, the number of samples is insufficient to detailed discussion of the entire hue angle range.

  Therefore, 15 types of color patches are selected for each hue from the color patches located at the outermost periphery having the highest saturation in the Munsell hue circle in the modified Munsell color system. These are the same as the color charts used in the Color Quality Scale (CQS) (version 7.4 and 7.5), which is one of the new color rendering evaluation indices proposed by the NIST (National Institute of Standards and Technology) in the United States. is there. The 15 types of color patches used in the present embodiment are listed below. At the beginning, the number given to the color chart for convenience is described. In the present specification, these numbers may be represented by n, and for example, n = 3 means "5PB 4/12". n is a natural number from 1 to 15.

# 01 7.5 P 4/10
# 02 10 PB 4/10
# 03 5 PB 4/12
# 04 7.5 B5 / 10
# 05 10 BG 6/8
# 06 2.5 BG 6/10
# 07 2.5 G 6/12
# 08 7.5 GY 7/10
# 09 2.5 GY 8/10
# 10 5 Y 8.5 / 12
# 11 10 YR7 / 12
# 125 YR7 / 12
# 13 10 R 6/12
# 145 R4 / 14
# 15 7.5 RP 4/12

  In the present embodiment, from the viewpoint of deriving various indices, in the case of assuming illumination with the reference light for calculation and in the case of assuming illumination with the test light, the appearance of the colors of these 15 types of color chips, When it changes (or does not change), it is natural, lively, and highly visible, even under normal indoor illuminance conditions, as seen under outdoor high illuminance environments. It was quantified as to whether the color appearance and the appearance of the object were comfortable, and extracted as the true color rendering property that the light emitting device should have.

In addition, in order to quantitatively evaluate the appearance of colors mathematically derived from the spectral distribution, it is important to select a color space and a chromatic adaptation formula. In this embodiment, CIE 1976 L ^* a ^* b ^* (CIELAB), which is a uniform color space currently recommended by CIE, was used. Further, for the chromatic adaptation calculation, CCMCAT2000 (Color Measurement Committee's Chromatic Adaptation Transform) is used.
of 2000).

Note that the CIELAB color space is a three-dimensional color space. However, in the CIELAB color space according to the present embodiment, lightness is omitted because mainly focusing on saturation and hue, and only the a ^* and b ^* axes are used. Plotted in two dimensions. In the CIELAB color space used in the description of the examples / comparative examples, etc. in the present embodiment, the points connected by dotted lines in the figure are the results assuming illumination with the reference light for calculation, and the solid lines are the respective test light. This is the result of assuming illumination at.

More specifically, quantification relating to color appearance was performed as follows. First, when the light emitting device according to the present embodiment emits test light in the main radiation direction, the 15 types of the test light (according to the light emitting device of the present embodiment) in the CIE 1976 L ^* a ^* b ^* color space are used. The a ^* value and b ^* value of the color chart are a ^* _nSSL and b ^* _nSSL (where n is a natural number from 1 to 15), and the hue angles of the 15 types of color _charts are θ _nSSL (degrees) (where n is (A natural number from 1 to 15). Furthermore, the reference light for calculation (5) selected according to the correlated color temperature T _SSL of the test light
The CIE 1976 L ^* a ^* b ^* color space a ^* value, b in the CIE 1976 L ^* color space when mathematically assuming illumination by black body radiation light below 000K and CIE daylight above 5000K) ^* Values are a ^* _nref and b ^* _nref (where n is a natural number from 1 to 15), and hue angles of the 15 types of color _patches are θ _nref (degrees) (where n is a natural number from 1 to 15). . Here, the absolute value of each of the hue angle difference between the 15 types of modified Munsell color chart when illuminated with the two light Delta] h _n (degrees) (where n is a natural number of 1 to 15) | Delta] h _n | is | Δh _n | = | θ _nSSL −θ _nref |
It is.

  As described above, the mathematically expected hue angle difference relating to the 15 types of modified Munsell color charts specially selected in this embodiment is defined by the test light and the experimental reference light or the experimental pseudo reference light. When performing visual experiments using, we evaluate various objects or the color appearance of objects as a whole, and realize natural, lively, highly visible, comfortable, color appearance, and object appearance This is because, as a means, they thought that these would be important indicators.

In addition, the saturation difference ΔC _n (where n is a natural number from 1 to 15) of the 15 types of modified Munsell color patches assuming illumination with two lights, the test light and the calculation reference light, is ΔC _n = √ ｛(a ^* _nSSL ) ² + (b ^* _nSSL ) ² ｝ −√ ｛(a ^* _nref ) ² + (b ^* _nref ) ² ｝
And Also, the average value SAT _ave of the saturation difference between the 15 types of modified Munsell color _charts is given by the equation (3)
).
Further, when the maximum value of the saturation difference of the 15 types of modified Munsell color patches is ΔC _max and the minimum value of the saturation difference is ΔC _min , the difference between the maximum saturation difference and the minimum saturation difference (maximum) The difference between the minimum saturation differences) is | ΔC _max −ΔC _min |
And

As described above, the various characteristics relating to the mathematically predicted saturation difference relating to the 15 types of modified Munsell color patches specifically selected in the present embodiment are defined by the test light and the experimental reference light or When conducting a visual experiment using the pseudo reference light for an experiment, various objects or the color appearance of the object are evaluated as a whole, and a natural, lively, highly visible, comfortable, color appearance, object This is because we thought that these would be important indices as a means of realizing the appearance of the image.

<Radiation efficiency K (lm / W) and light source efficiency η (lm / W)>
Furthermore, in evaluating the test light spectral distribution φ _SSL (λ) when measuring light in the main radiation direction emitted from the light emitting device according to the present embodiment, the radiation efficiency K (Lumin
ous Efficiency of radiation (lm / W) followed the following widely used definition.

In the above equation,
K _m : maximum visibility (lm / W)
V (λ): spectral luminous efficiency λ: wavelength (nm)
It is.

Therefore, the radiation efficiency K (lm / W) of the test light spectral distribution φ _SSL (λ) when measuring light in the main radiation direction emitted from the light emitting device according to the present embodiment has the spectral distribution as its shape. It can be said that it is efficiency.

  On the other hand, the light source efficiency η (lm / W) is a quantity indicating how much the electric power supplied to the light emitting device according to the present embodiment is converted into a light flux.

In other words / additionally, the radiation efficiency K (lm / W) of the test light spectral distribution φ _SSL (λ) in the case where the light emitted from the light emitting device in the main radiation direction is measured is represented by the shape of the spectral distribution itself. The efficiency related to all the material properties of the light emitting device (for example, the internal quantum efficiency of the semiconductor light emitting element, the light extraction efficiency, the internal quantum efficiency of the phosphor, the external quantum efficiency, the light transmission property of the sealing agent, etc.). Is 100%, it can be said that the amount is equal to the light source efficiency η (lm / W).

<Inspiration of the invention relating to light source efficiency>
The present inventor has determined whether or not it is possible to achieve both good color appearance and high light source efficiency when the index A _cg is out of the range of −360 or more and −10 or less, particularly when the index A _cg has a value larger than −10. As discussed, mathematically and experimentally.

The index A _cg is large in the visible region related to radiation as a color stimulus, in a short wavelength region (380 nm or more and less than 495 nm in a blue region including purple etc.), in an intermediate wavelength region (495 nm or more and less than 590 nm in a green region including yellow etc.), and long. It is divided into a wavelength region (590 nm or more and 780 nm or less in a red region including an orange color, etc.) and compared with a mathematical standardized reference light spectral distribution at an appropriate position in the normalized test light spectral distribution with an appropriate intensity. Is an index for judging whether or not the unevenness of the spectral distribution exists. As illustrated in FIGS. 2 and 3, the integration range in the long wavelength region differs depending on the position of the maximum value of the longest wavelength. The selection of the reference light for calculation differs depending on the correlated color temperature _TSSL of the test light. In the case of FIG. 2, since the CCT of the test light shown by the solid line in the figure is 5000K or more, CIE daylight (CIE daylight) is selected as the reference light as shown by the dotted line in the figure. In the case of FIG. 3, since the CCT of the test light shown by the solid line in the figure is less than 5000 K, the light of black body radiation is selected as the reference light as shown by the dotted line in the figure. The shaded portions in the figure schematically show the integration ranges of the short wavelength region, the intermediate wavelength region, and the long wavelength region.

Now, as disclosed in Japanese Patent No. 5252107 and Japanese Patent No. 5257538, “a light-emitting device capable of realizing natural, lively, highly visible, comfortable, colored, and visible objects” can be realized. One of the requirements is that the index A _cg is in the range of −360 or more and −10 or less, and these can be understood to have the following meanings.

In the short wavelength region, when the spectral intensity of the standardized test light spectral distribution is stronger than the mathematical standardized reference light spectral distribution, the first term of the index A _cg (the integral of ΔS (λ)) is a negative value. Easy to take.
Conversely, in the intermediate wavelength region, when the spectral intensity of the standardized test light spectral distribution is weaker than the standardized reference light spectral distribution, the second term (integration of -ΔS (λ)) of the index A _cg is minus. Easy to take value.
Further, in the long wavelength region, when the spectral intensity of the standardized test light spectral distribution is stronger than the standardized reference light spectral distribution, the third term (integration of ΔS (λ)) of the index A _cg takes a negative value. It is an easy-to-take index.
That is, in the case of such a tendency, one of the requirements for realizing the “light emitting device capable of realizing a natural, lively, highly visible, comfortable, color appearance, and object appearance” is satisfied. Can be understood.

Note that, as described above, the reference light for calculation changes depending on the CCT of the test light. That is, when the CCT of the test light is less than 5000K, black body radiation light is used as the reference light for calculation, and when the CCT of the test light is 5000K or more, the defined CIE daylight (CIE daylight) is used. Used. In deriving the value of the index A _cg , φ _ref (λ) uses mathematically defined light of blackbody radiation or CIE daylight, while φ _SSL (λ) denotes a simulated function or an experimental value. A light emitting device was manufactured as a prototype, and a value obtained by actually measuring light emitted in the main radiation direction was used.

  On the other hand, when it is attempted to improve the light source efficiency as a light source, a shape substantially different from the spectral distribution disclosed in Japanese Patent No. 5252107 and Japanese Patent No. 5257538 is considered from the viewpoint of the spectral luminous efficiency V (λ). Is required to do so.

The first term (the wavelength integral of ΔS (λ) from 380 nm to 495 nm) and the third term (the wavelength integral of ΔS (λ) from 590 nm to Λ4 or 780 nm) of the index A _cg are obtained from the standardized reference light spectral distribution. Also, it is desired that the spectral intensity of the normalized test light spectral distribution is not excessively strong, in other words, the wavelength integral of ΔS (λ) does not take an excessive negative value and falls within an appropriate range. This is because V (λ) in this region has a relatively small value, so that even if excessively strong radiation is present in the region, its contribution to improving the luminous flux is small. In addition, in an attempt to improve the light source efficiency, the second term of the index A _cg (the wavelength integral of −ΔS (λ) from 495 nm to 590 nm) becomes smaller than the standardized reference light spectral distribution. Is not excessively weak, in other words, it is desired that the wavelength integral of-[Delta] S ([lambda]) does not take an excessive negative value and falls within an appropriate range. This is because V (λ) in this region has a relatively large value, and if excessively weak radiation is present in this region, the contribution to improving the luminous flux is reduced.

  Therefore, based on the above-described concept, the present inventor has achieved a higher light source efficiency and an excellent color appearance of an illumination object by a spectral distribution completely different from the contents disclosed in Japanese Patent No. 5252107 and Japanese Patent No. 5257538. The light source is verified whether it can be realized, and the light source reaches the light emitting device according to the present embodiment. The specific method is as follows.

First, as a light emitting element that emits light in the intermediate wavelength region, a broadband light emitting element different from the narrow band light emitting element disclosed as a preferable case in Japanese Patent No. 5252107 and Japanese Patent No. 5257538 was selected. By doing so, the “excessive unevenness of the normalized test light spectral distribution compared to the normalized reference light spectral distribution” in the intermediate wavelength region is reduced, and the second term of the index A _cg (−49 nm to 590 nm- It was considered that the spectral intensity of the standardized test light spectral distribution can be prevented from becoming excessively weaker than the standardized reference light spectral distribution in the wavelength integration of ΔS (λ).

Further, when selecting the phosphor excitation light source in the LED light emitting device, the “excessive unevenness of the normalized test light spectral distribution compared to the normalized reference light spectral distribution” in the short wavelength region is reduced, and the index A _cg One term (wavelength integral of ΔS (λ) from 380 nm to 495 nm) was prevented from being an excessive negative value. That is, in order to prevent the spectral intensity of the standardized test light spectral distribution from being excessively stronger than the standardized standard light spectral distribution, the phosphor excitation light source is located in a region where the spectral intensity of the standardized reference light spectral distribution is relatively high. Having an emission wavelength of Specifically, a blue semiconductor light emitting device was selected as a phosphor excitation light source instead of a violet semiconductor light emitting device.

<Experimental method and summary>
An experiment for completing the light emitting device according to the present embodiment and a summary thereof were performed as follows.
As a light emitting device, a package LED in which various semiconductor light emitting elements, various phosphors, a sealing material, and the like were included in a small package of 3.5 mm × 3.5 mm square was prepared. In addition, an LED lamp including the package LED was also prototyped.

  In order to compare the various light-emitting devices prototyped fairly, the small package material, the mounting position / method of the semiconductor light-emitting device, and the shape of the LED lamp, except for various semiconductor light-emitting elements, various phosphors and their blends changed for each device / The materials were the same for all light sources. Further, in the LED lamp, a material having a flat transmission characteristic from 350 nm to about 800 nm was used for the mounted lens in order to preserve the spectral radiation characteristic of the package LED included therein as much as possible.

  Under such conditions, the radiometric properties and photometric properties of each light emitting device were measured. Furthermore, comparing the color appearance of the 15 types of modified Munsell color chart when assuming illumination with light having a spectral distribution of each light emitting device and that when assuming illumination with reference light for calculation, This change (or no change) was mathematically derived from a colorimetric viewpoint, and the color appearance was quantitatively evaluated using the above-mentioned index.

  Further, in the experiment of the present embodiment, a comparative visual experiment was also performed in which the subject judged the superiority of color appearance. In the comparative visual experiment, experimental reference lights were prepared for each of the color temperature groups shown in Table 1 with reference to ANSI C78.377, and the same illumination target was independently used for the test light and the experimental reference light. -5, rank-4, rank-3, rank-2, rank-1, rank0, rank + 1, rank + 2, rank They were classified into 11 ranks, +3, rank +4, and rank +5.

Here, as the experimental reference light, a light emitting device having chromaticity coordinates near the black body locus as much as possible was prepared. For example, as shown in Comparative Experimental Example 1, the light emitting device that emits the reference light for the experiment is a single violet semiconductor light emitting element having an emission peak wavelength of 410 nm, an SBCA phosphor as a blue phosphor, and a peak at the time of light excitation as a narrow band green phosphor. Β-SiAlON phosphor having a wavelength of 545 nm and a full width at half maximum of 55 nm, and a red phosphor having a peak wavelength of 645 nm at the time of photoexcitation and a CASON phosphor having a full width at half maximum of 99 nm are used. A light having _a high _Ra and a high _Ri that is considered to be prepared was prepared. For example, the spectral radiation characteristic shown in Comparative Experimental Example 1 is an example of the experimental reference light of Group E divided for each CCT at the time of comparative visual observation. The calculated CCT was 4116K, D _uv was -0.0017, and _Ra was 98.0. Similarly, the other CCT groups also have chromaticity coordinates as close as possible to the blackbody locus, and when illuminating the illumination target, it is expected that the color will be close to the mathematical reference light. It was prepared a light-emitting device that emits light is a high R _a and high R _i is.

When performing a comparative visual experiment, in order to suppress the change in illuminance caused by changing the light emitting device, the distance between the lighting object and the light emitting device is set so that the illuminance at the position of the lighting object becomes substantially equal. Adjustments were made, the drive power supply was changed, and the amount of current injected into the LED lamp was adjusted.
The illuminance during the comparative visual experiment was in a range from about 100 lx to about 7000 lx.

  At the time of the comparative visual experiment, the following lighting objects were prepared. Here, consideration was given to preparing a chromatic object covering all hues such as purple, blue-violet, blue, blue-green, green, yellow-green, yellow, yellow-red, red, and red-violet. Further, achromatic objects such as white objects and black objects were also prepared. In addition, a large number of various kinds such as still life, flowers, food, clothing, printed matter, etc. were prepared. In the experiment, the skin of the subject (Japanese) was also observed. Note that the color names partially added before the following object names are not strict color expressions in the sense that they look like this under a normal environment.

White ceramic dish, white asparagus, white mushroom, white preserved flower, white handkerchief, white Y-shirt, cooked rice purple preserved flower, handkerchief made of blue purple cloth, blue jeans, blue preserved flower, blue green towel green paprika, lettuce, shredded cabbage, broccoli, green Lime, green apple yellow banana, yellow paprika, yellow green lemon, yellow preserved flower, fried orange orange, orange paprika, carrot red tomato, red apple, red paprika, red wiener, red preserved flower black preserved flower,
Pink tie, pink preserved flower,
Red bean tie, croquette, tonkatsu, burdock, cookies, chocolate,
Peanuts, wooden container The subject (Japanese) own skin newspaper, color printed matter containing black letters on a white background (multicolored paper), paperback book, weekly magazine silver (white dial), wristwatch color checker (X-rite Color checker) classic 24 colors including 18 chromatic colors and 6 achromatic colors (white 1, gray 4, black 1)

The name and Munsell notation of each color chart in the color checker are as follows.
Name Munsell Notation
Dark skin 3.05 YR 3.69 / 3.20
Light skin 2.2 YR 6.47 / 4.10
Blue sky 4.3 PB 4.95 / 5.55
Foliage 6.65 GY 4.19 / 4.15
Blue flower 9.65 PB 5.47 / 6.70
Bluish green 2.5 BG 7/6
Orange 5 YR 6/11
Purplish blue 7.5 PB 4 / 10.7
Moderate red 2.5 R 5/10
Purple 5 P 3/7
Yellow green 5 GY 7.08 / 9.1
Orange yellow 10 YR 7 / 10.5
Blue 7.5 PB 2.90 / 12.75
Green 0.1 G 5.38 / 9.65
Red 5 R 4/12
Yellow 5 Y 8 / 11.1
Magenta 2.5 RP 5/12
Cyan 5 B 5/8
White N 9.5 /
Neutral 8 N 8 /
Neutral 6.5 N 6.5 /
Neutral 5 N 5 /
Neutral 3.5 N 3.5 /
Black N 2 /

  The ranking at the time of conducting the comparative visual experiment was statistically processed based on the subject's ranking result, and was as follows. When the light was the same as or similar to the reference light for the experiment, or when no change was felt, it was ranked as rank 0. In addition, "natural, lively, highly visible, comfortable, color appearance and object appearance can be realized". Rank +1 if slightly preferable, rank +2 if preferable, rank +3 if more preferable, When it was very preferable, the rank was +4, and when it was extremely preferable, the rank was +5. On the other hand, if "natural, lively, highly visible, comfortable, color appearance and object appearance cannot be realized", depending on the degree, rank -1 is slightly unfavorable and rank -1 is unfavorable. Rank-2, if not more preferred, rank-3; if not very preferred, rank-4; if not particularly preferred, rank-5.

  In order to judge the rank, the subject was instructed to observe the lighting target from the following viewpoints and to give a comprehensive score. That is, when illuminated by each light emitting device compared with the case of illuminating with the experimental reference light, A) whether "achromatic color appearance" such as black and white is preferably perceived, B) black characters on a white background C) whether the characters described in printed matter, newspapers and the like are easy to read, C) whether or not "the appearance of chromatic colors" having various hues, including the skin color of the subject itself, is preferably perceived; D) E) whether the color of an object having an approximate hue (for example, red paprika as two different individuals) is easy to discriminate, E) whether it is felt bright even with the same illuminance (whether the brightness is improved) is there.

  In the various indexes summarized in Tables 2 to 15 below, the column described as “light emitting element” indicates the characteristics of the light emitting element alone as described above, and the column described as “light emitting device” is not included. , Package LED. The column labeled “Color Appearance” is the result obtained by calculation from the spectral distribution of the package LED, and the column labeled “Comparative Visual Experiment Result” uses the LED lamp that includes the package LED. It is a result of ranking about the appearance of the color of the lighting object at the time of the comparative visual experiment.

  Hereinafter, the invention relating to the improvement of the light source efficiency will be described in detail using an experimental example and a comparative experimental example. However, it is needless to say that the scope of the present invention is not limited to the experimental example.

<Overview>
First, the outline and effects of this embodiment will be described using four types of light emitting devices shown in Table 2 as examples.

In Comparative Experimental Example 1, when an object to be illuminated is illuminated, colors appear close to the reference light, the average color rendering index (R _a ) is extremely high, and the special color rendering index (R _i ) is high. The light-emitting device emits reference light, and A _cg was +64.1. This light source uses a violet semiconductor light emitting element as a phosphor excitation light source, and has a narrow band β-SiAlON as a green phosphor (the wavelength that gives the maximum emission intensity at the time of photoexcitation of the phosphor alone is 545 nm, and the full width at half maximum thereof). Is 55 nm).
The details of the SBCA phosphor, the β-SiAlON phosphor, and the CASON phosphor described in the present specification are the same as those disclosed in Japanese Patent No. 5252107 and Japanese Patent No. 5257538.

Comparative Experimental Example 2 is a light-emitting device that emits light disclosed in Japanese Patent No. 5252107 and Japanese Patent No. 5257538, and A _cg was −44.9. This light-emitting device also uses a violet semiconductor light-emitting element as a phosphor excitation light source and gives a narrow band β-SiAlON (a maximum light emission intensity at the time of photoexcitation of a phosphor alone) as a green phosphor, similarly to Comparative Experimental Example 1. The wavelength is 545 nm and the full width at half maximum is 55 nm.

Reference Experimental Example 1 is also a light-emitting device that emits light falling under the category of Japanese Patent No. 5252107 and Japanese Patent No. 5257538, and A _cg was −58.7. However, this light-emitting device uses a blue semiconductor light-emitting element as a phosphor excitation light source, and has a broadband CSMS (green light having a maximum emission intensity of 514 nm at the time of light excitation of a single phosphor) and a full width at half maximum as a green phosphor. Are realized using 106 nm).

On the other hand, Experimental Example 1 is a novel light emitting device that emits light that is not disclosed in Japanese Patent No. 5252107 and Japanese Patent No. 5257538, and A _cg was +10.4. This light source uses a blue semiconductor light emitting element as a phosphor excitation light source, and has a broad band CSO as a green phosphor. This is realized using.

For comparison, these four light-emitting devices have correlated color temperatures (approximately 3800 to 4200 K) close to each other. Except for the light emitting device of Comparative Experimental Example 1 prepared as the reference light for experiment, D _uvSSL was also set to a close value (about -0.0100 to -0.0125).

  In addition, Table 2 summarizes detailed constituent materials of each light source, their characteristics, and characteristics as a light emitting device. Table 2 also shows the results of mathematically deriving the difference in the color appearance between the case of illuminating with the reference light and the case of illuminating with the respective test lights in the specific 15 types of modified Munsell color charts. . Furthermore, based on the light-emitting device of Comparative Example 1 prepared as the reference light for the experiment, the results of a comparative visual experiment were conducted to see how the remaining three types of light-emitting devices provided the actual color appearance. ing.

The spectral radiant flux characteristics of the light emitting device of Comparative Experimental Example 1, the light emitting device of Comparative Experimental Example 2, the light emitting device of Reference Experimental Example 1, and the light emitting device of Experimental Example 1 are shown in FIGS. FIGS. 4 to 7 show the a ^* value and b ^* value of the color appearance when illuminated with reference light and when illuminated with each test light in the specific 15 types of modified Munsell color charts. And CIELAB color space plotted together. In the CIELAB color space, when illuminated with reference light, it is indicated by a dotted line, and when illuminated with each test light, it is indicated by a solid line.

Here, the following can be understood from Table 2 and FIGS. 5 to 7.
In the light emitting device of Comparative Experimental Example 2, the index A _cg was -44.9, and the light source efficiency η as the light emitting device was 45.9 (lm / W). In addition, mathematically, it can be seen from FIG. 5 that the saturation of each hue is relatively evenly improved. Judgment, rank 4.

Further, in the light emitting device of Reference Experimental Example 1, the index A _cg was -58.7, and the light source efficiency η as the light emitting device was 48.0 (lm / W). Mathematically, it can be seen from FIG. 6 that the saturation of each hue is relatively evenly improved, and the color appearance is actually judged to be better than that of the light emitting device of Comparative Example 1, and rank 4 Met.

On the other hand, in the light emitting device shown in Experimental Example 1, the index A _cg was +10.4. The light source efficiency η as a light emitting device was 54.4 (lm / W), which was relatively higher than any of the light emitting devices. Also, mathematically, it can be seen from FIG. 7 that the saturation of each hue is relatively uniformly improved, and it is actually judged that the color appearance is better than the light emitting device of Comparative Example 1. Rank 5

That is, the result of the light emitting device of Experimental Example 1 is out of the range of the light emitting devices described in Japanese Patent No. 5252107 and Japanese Patent No. 5257538, and especially when the index A _cg has a value larger than −10, Thus, it can be said that it specifically illustrates that a "light-emitting device capable of realizing a lively, highly visible, comfortable, color appearance and an object appearance" can be realized. Further, it is understood that the light source efficiency η of the light emitting device can be improved only in such a case.

<Detailed explanation 1>
Next, the improvement of the light source efficiency according to the present embodiment will be described in detail by further illustrating experimental examples / comparative experimental examples.
Tables 3 to 7 show experimental examples of this embodiment. These are the results of the light-emitting devices that were ranked from rank +1 to rank +5 in the overall rank classification of the comparative visual experiment in the order of the table numbers. Light emitting devices classified into one rank were arranged in order from low _TSSL to high _TSSL . 8 to 14 exemplify the spectral distribution of light emitted from the light emitting device extracted from each rank as an example and the CIELAB color space.

When the results of these experimental examples / comparative experimental examples were examined in detail, the color appearance illuminated by the light emitting device was judged to be rank +1 or higher in the comparative visual experiment. You can see that he was doing.
Condition α: Blue semiconductor light emitting device Condition β: Broadband green phosphor Condition γ: Red phosphor

On the other hand, in order for the appearance of the color illuminated by the light emitting device to be judged to be rank +1 or more in the comparative visual experiment, each index derived from the spectral distribution φ _SSL (λ) of the light emitting device has the following features. It turns out that it had.
Condition 1: −10.0 <A _cg ≦ 120.0
Condition 2: −0.0220 ≦ D _uvSSL ≦ −0.0070
Condition 3: 0.2250 ≦ φ _SSL-BG-min / φ _SSL-BM-max ≦ 0.7000
Condition 4: 605 (nm) ≦ λ _SSL-RM-max ≦ 653 (nm)

Further, the spectral distribution φ _SSL (λ) of the light emitting device determined to be rank +1 or more in the comparative visual experiment
Can also have the following features.
Condition 5: 430 (nm) ≦ λ _SSL-BM-max ≦ 480 (nm)
Condition 6: 0.1800 ≦ φ _SSL-BG-min / φ _SSL-RM-max ≦ 0.8500

In addition, the spectral distribution φ _SSL (λ) of the light emitting device determined to be rank +1 or higher in the comparative visual experiment
It can also be seen that the radiation efficiency K (lm / W) and the correlated color temperature T _SSL (K) derived from can have the following characteristics.
Condition 7: 210.0 lm / W ≦ K ≦ 290.0 lm / W
Condition 8: 2600 K ≦ T _SSL ≦ 7700 K

In addition, it can be seen that φ _SSL (λ) of the light emitting device determined to have rank +1 or more in the comparative visual experiment may have a characteristic having no effective intensity derived from the light emitting element in the range of 380 nm to 405 nm.

Further, it can be understood that φ _SSL (λ) of the light emitting device determined to be rank +1 or more in the comparative visual experiment may have a feature that the light emitting element does not include a narrow-band green phosphor and a yellow phosphor.

On the other hand, each index relating to “color appearance” derived from the spectral distribution φ _SSL (λ) of the light emitting device whose color appearance illuminated by the light emitting device is determined to be rank +1 or more in the comparative visual experiment is n
Is assumed to be a natural number from 1 to 15 and has all the following features.
Condition I—4.00 ≦ ΔC _n ≦ 8.00
Condition II: 0.50 ≦ SAT _ave ≦ 4.00
Condition III: 2.00 ≦ | ΔC _max −ΔC _min | ≦ 10.00
Condition IV: 0.00 degrees ≦ | Δh _n | ≦ 12.50 degrees

The following can be seen from the results of calculating the appearance of colors by the spectral distribution φ _SSL (λ) of the light emitting device that satisfies the above, that is, FIGS. 7 to 14.
When comparing the color appearance assuming that the 15 types of modified Munsell color chips were illuminated with the reference light and the case of illuminating with the spectral distribution φ _SSL (λ) of each light emitting device, in any light emitting device, (1) The hue angle difference is small, and (2) the saturation is relatively uniformly improved in any of the 15 types of hues, and (3) the degree of the saturation improvement is within an appropriate range. I understand that. If such features do indeed illuminate the illuminated object, it is considered to induce "natural, lively, highly visible, comfortable, color appearance, object appearance", and Mathematically, it can be said that the conditions correspond to the conditions I to IV.

  More specifically, the effect of the appearance of color is described. When the light emitting device of this embodiment is used for illumination, A) “achromatic color” such as black and white as compared with the case of illumination with reference light. B) "colored colors" having various hues, including B) printed characters including black characters on a white background, characters described in newspapers and the like are easily perceived, and C) the subject's own skin color and the like. Color appearance "is preferably perceived, D) the color of an object having an approximate hue is easily perceived and perceived, and E) there is an effect of feeling bright even with the same illuminance.

Further, regarding the selection of the blue semiconductor light-emitting element described in the condition α, the characteristics are considered to be as follows in light of the results classified from rank +1 to rank +5.
The dominant wavelength λ _CHIP-BM-dom of the blue light-emitting element during pulse driving of the element _itself is 44
5 nm or more and 475 nm or less can be selected,
From the results of the entire experimental example, it is slightly preferable to select 447.5 nm or more and 470 nm or less,
From the results of ranks +4 to +5, it is very preferable to select 452.5 nm or more and 470 nm or less,
From the result of rank +5, it is much more preferable to select around 457.5 nm. In addition, the vicinity means ± 2.5 nm.

Further, regarding the selection of the broadband green phosphor described in the condition β, the characteristics are considered to be as follows in the light of the results of classification from rank +1 to rank +5.
The wavelength λ _PHOS-GM-max of the broadband green phosphor that gives the maximum emission intensity at the time of light excitation of the phosphor alone is 511 nm or more and 543 nm or less, and the full width at half maximum W _PHOS-GM-fwhm is 90 n.
m or more and 110 nm or less,
From the results of the entire experimental example, the wavelength λ _PHOS-GM-max giving the maximum emission intensity at the time of photoexcitation of the phosphor alone is 514 nm or more and 540 nm or less, and the full width at half maximum W _PHOS-GM-fwhm is 96 nm.
It is slightly preferable to select not less than 108 nm or less,
From the results of ranks +2 to +5, the wavelength λ _PHOS-GM-max giving the maximum emission intensity at the time of photoexcitation of the phosphor alone is 520 nm or more and 540 nm or less, and the full width at half maximum W _PHOS-GM-fwhm is 96 nm or more and 108 nm or less. It is preferable to select
From the result of rank +5, the wavelength λ _PHOS-G that gives the maximum emission intensity when the phosphor alone is excited by light
_M-max is 520 nm or more and 530 nm or less, and its full width at half maximum W _PHOS-GM-fwhm is 96 nm.
It is particularly preferable to select a thickness of at least 104 nm.
Further, from the overall tendency, the wavelength λ _PHOS-GM-max giving the maximum emission intensity at the time of photoexcitation of the phosphor alone is 521 nm or more and 529 nm or less, and the full width at half maximum W _PHOS-GM-fwhm is 97 n.
It is considered that selecting from m to 103 nm is much more preferable. These tendencies are considered to be necessary in the light emitting device of the present embodiment in order to have irregularities of an appropriate size at appropriate positions of the spectral distribution φ _SSL (λ).

Further, specific phosphor materials are considered to have the following characteristics in light of the results of classification from rank +1 to rank +5.
The green phosphor is not particularly limited as long as it emits green light when the material alone is excited by light and satisfies the above-mentioned optical characteristics. Phosphor, BSS phosphor, BSON phosphor and the like can be exemplified,
From the results of the entire experimental example, it is slightly preferable to select LuAG phosphor, CSO phosphor, G-YAG phosphor, and CSMS phosphor,
From the results of ranks +2 to +5, it is preferable to select LuAG phosphor, CSO phosphor, and G-YAG phosphor,
From the result of rank +5, it is particularly preferable to select a LuAG phosphor and a CSO phosphor.

Further, regarding the selection of the red phosphor described in the condition γ, the characteristics are considered to be as follows in light of the results of classification from rank +1 to rank +5.
The wavelength λ _PHOS-RM-max of the red phosphor that gives the maximum emission intensity at the time of light excitation of the phosphor alone is 622 nm to ₆₆₃ nm, and the full width at half maximum W _PHOS-RM-fwhm is 80 nm to 105 nm. Is possible,
From the results of the entire experimental example, the wavelength λ _PHOS-RM-max giving the maximum emission intensity at the time of photoexcitation of the phosphor alone is 625 nm or more and 660 nm or less, and the full width at half maximum W _PHOS-RM-fwhm is 87 nm.
It is slightly preferable to select a thickness of not less than 99 nm or less,
From the results of ranks +4 to +5, the wavelength λ _PHOS-RM-max giving the maximum emission intensity at the time of light excitation of the phosphor alone is 645 nm or more and 660 nm or less, and the full width at half maximum W _PHOS-RM-fwhm is 88 nm or more and 99 nm or less. It is highly preferred to choose
From the result of rank +5, the wavelength λ _PHOS-RM-max giving the maximum emission intensity at the time of photoexcitation of the phosphor alone is 645 nm or more and 660 nm or less, and the full width at half maximum W _PHOS-RM-fwhm is 88 nm.
It is particularly preferable to select a thickness of not less than 89 nm.
In addition, from the overall tendency, the wavelength λ _PHOS-RM-max that gives the maximum emission intensity at the time of light excitation of the phosphor alone is 632 nm or more and 660 nm or less, and the full width at half maximum W _PHOS-RM-fwhm is 88 _μm.
It may be preferable to select a thickness of not less than nm and not more than 99 nm.

Further, specific phosphor materials are considered to have the following characteristics in light of the results of classification from rank +1 to rank +5.
The red phosphor is not particularly limited as long as it emits red light when the material alone is excited by light and satisfies the above-mentioned optical characteristics, and examples thereof include CASN phosphor, CASON phosphor, and SCASN phosphor. So,
It is slightly preferable to select CASN phosphor, CASON phosphor, and SCASN phosphor from the results of the entire experimental examples,
It is very preferable to select CASN phosphor and CASON phosphor from the result of rank +4 to +5,
It is particularly preferable to select a CASN phosphor from the result of rank +5.

Further, regarding the selection of the index A _cg described in the condition 1, in view of the result of classification from rank +1 to rank +5, the characteristics are considered to be as follows.
The index is selectable from -10.0 to 120.0,
From the results of the entire experimental example, it is slightly preferable to select -4.6 to 116.3,
From the results of ranks +3 to +5, it is more preferable to select from -4.6 to 87.7,
From the results of ranks +4 to +5, it is highly preferable to select -4.6 to 70.9,
From the result of rank +5, it is much more preferable to select a value between -1.5 and 26.0.

Further, regarding the selection of D _uvSSL described in the condition 2, in view of the result of classification from rank +1 to rank +5, the characteristics are considered to be as follows.
The distance D _uvSSL can be selected from -0.0220 to -0.0070,
From the results of the entire experimental example, it is slightly preferable to select -0.0212 or more and -0.0071 or less,
From the results of ranks +3 to +5, it is more preferable to select -0.0184 or more and -0.0084 or less,
From the result of rank +4 to +5, it is very preferable to select -0.0161 or more and -0.0084 or less,
From the result of rank +5, it is particularly preferable to select -0.0145 or more and -0.0085 or less.
In addition, from the whole tendency, it is much more preferable that D _uvSSL is -0.0145 or more and -0.0090 or less, and it is much more preferable to select -0.0140 or more and less than -0.0100. , -0.0135 or more and less than -0.0120 may be considered even more particularly preferred.

Further, regarding the selection of the value φ _SSL-BG-min / φ _SSL-BM-max described in the condition 3, in view of the result of classification from rank +1 to rank +5, the characteristics are considered to be as follows.
The value φ _SSL-BG-min / φ _SSL-BM-max can be selected from 0.2250 to 0.7000,
From the results of the entire experimental example, it is slightly preferable to select 0.2278 or more and 0.6602 or less,
From the result of rank +4 to +5, it is very preferable to select 0.2427 or more and 0.6225 or less,
From the result of rank +5, it is particularly preferable to select 0.2427 or more and 0.5906 or less.

Further, regarding the selection of the wavelength λ _SSL-RM-max described in the condition 4, in view of the result of classification from rank +1 to rank +5, the characteristics are considered as follows.
The wavelength λ _SSL-RM-max is selectable from 605 nm to 653 nm,
From the results of the entire experimental example, it is slightly preferable to select 606 nm or more and 652 nm or less,
From the results of ranks +3 to +5, it is more preferable to select 607 nm or more and 647 nm or less,
From the results of ranks +4 to +5, it is very preferable to select 622 nm or more and 647 nm. From the above tendency, it can be considered that it is much more preferable to select λ _SSL-RM-max from 625 nm to 647 nm.
In addition, from the result of rank +5, it is particularly preferable to select 630 nm or more and 647 nm or less.
Further, from the overall tendency, it can be considered that it is much more preferable to select λ _SSL-RM-max from 631 nm to 647 nm.
These tendencies are considered to be necessary in the light emitting device of the present embodiment in order to have irregularities of an appropriate size at appropriate positions of the spectral distribution φ _SSL (λ).

Further, regarding the selection of the wavelength λ _SSL-BM-max described in the condition 5, in view of the result of classification from rank +1 to rank +5, the characteristics are considered as follows.
The wavelength λ _SSL-BM-max can be selected from 430 nm to 480 nm,
From the results of the entire experimental example, it is slightly preferable to select 440 nm or more and 460 nm or less,
From the results of ranks +4 to +5, it is highly preferable to select 447 nm or more and 460 nm,
From the result of rank +5, it is particularly preferable to select 450 nm or more and 457 nm or less.
Further, from the overall tendency, it can be considered that it is much more preferable to select λ _SSL-BM-max from 451 nm to 456 nm.
These tendencies are considered to be necessary in the light emitting device of the present embodiment in order to have irregularities of an appropriate size at appropriate positions of the spectral distribution φ _SSL (λ).

Further, regarding the selection of the value φ _SSL-BG-min / φ _SSL-RM-max described in the condition 6, in view of the result of classification from rank +1 to rank +5, the characteristics are considered as follows.
The value φ _SSL-BG-min / φ _SSL-RM-max can be selected from 0.1800 to 0.8500,
From the results of the entire experimental example, it is slightly preferable to select 0.1917 or more and 0.8326 or less,
From the results of ranks +3 to +5, it is more preferable to select from 0.1917 to 0.6207,
From the results of ranks +4 to +5, it is very preferable to select 0.1917 or more and 0.6202 or less,
From the result of the rank +5, it is particularly preferable to select 0.1917 or more and 0.5840 or less.
From the overall tendency, it may be preferable to select φSSL _-BG-min / φSSL _-RM-max from 0.1917 to 0.7300.
These tendencies are considered to be necessary in the light emitting device of the present embodiment in order to have irregularities of an appropriate size at appropriate positions of the spectral distribution φ _SSL (λ).

Further, regarding the selection of the radiation efficiency K (lm / W) described in the condition 7, the characteristics are considered to be as follows in light of the result of classification from rank +1 to rank +5.
The radiation efficiency K (lm / W) can be selected from 210.0 (lm / W) to 290.0 (lm / W),
From the results of the entire experimental example, it is slightly preferable to select 212.2 (lm / W) or more and 286.9 (lm / W) or less,
From the results of ranks +2 to +5, it is preferable to select from 212.2 (lm / W) to 282.3 (lm / W),
From the results of ranks +4 to +5, it is highly preferable to select from 212.2 (lm / W) to 261.1 (lm / W),
From the result of rank +5, it is much more preferable to select a value between 212.2 (lm / W) and 256.4 (lm / W).

Further, regarding the selection of the correlated color temperature T _SSL (K) described in the condition 8, the characteristics are considered to be as follows in light of the results of classification from rank +1 to rank +5.
The correlated color temperature T _SSL (K) can be selected from 2600 (K) to 7700 (K), and
From the results of the entire experimental example, it is slightly preferable to select 2644 (K) or more and 7613 (K) or less,
From the results of ranks +4 to +5, it is highly preferable to select a value between 2644 (K) and 6797 (K).

Further, regarding the selection of the saturation degree difference ΔC _n described in the condition I, the rank +1 to the rank +5
In light of the results classified into the above, the characteristics are considered as follows.
The saturation degree difference ΔC _n can be selected from −4.00 to 8.00,
From the results of the entire experimental example, it is slightly preferable to select -3.49 or more and 7.11 or less,
From the results of ranks +2 to +5, it is preferable to select -3.33 or more and 7.11 or less,
From the result of rank +4 to +5, it is very preferable to select -1.73 or more and 6.74 or less,
From the result of the rank +5, it is particularly preferable to select from -0.93 to 6.74.

Further, regarding the selection of the SAT _ave described in the condition II, the characteristics are considered to be as follows in light of the result of classification from rank +1 to rank +5.
The SAT _ave can be selected from 0.50 to 4.00,
From the results of the entire experimental example, it is slightly preferable to select 0.53 or more and 3.76 or less,
From the result of rank +2 to +5, it is preferable to select 1.04 or more and 3.76 or less,
From the results of ranks +3 to +5, it is more preferable to select 1.11 to 3.76,
From the result of rank +4 to +5, it is very preferable to select 1.40 or more and 3.76 or less,
From the result of rank +5, it is particularly preferable to select 1.66 or more and 3.76 or less.

Further, regarding the selection of the difference | ΔC _max −ΔC _min | between the maximum value of the saturation difference and the minimum value of the saturation difference described in the condition III, in light of the result of classification from rank +1 to rank +5 The features are considered to be as follows.
The difference | ΔC _max −ΔC _min | can be selected from 2.00 to 10.00,
From the results of the entire experimental example, it is slightly preferable to select 3.22 or more and 9.52 or less,
From the result of rank +4 to +5, it is very preferable to select 4.12 or more and 7.20 or less,
From the result of rank +5, it is particularly preferable to select 4.66 or more and 7.10 or less.

Furthermore, regarding the selection of the absolute value | Δh _n | of the hue angle difference described in the condition IV, the rank +1
In light of the result of classification into rank +5, the characteristics are considered to be as follows.
The absolute value | Δh _n | of the hue angle difference can be selected from 0.00 to 12.50, and
From the results of the entire experimental example, it is slightly preferable to select 0.00 or more and 12.43 or less,
From the result of rank +2 to +5, it is preferable to select 0.01 or more and 12.43 or less,
From the results of ranks +3 to +5, it is more preferable to select from 0.02 to 12.43,
From the results of ranks +4 to +5, it is very preferable to select a value between 0.02 and 9.25.

It is considered that the absolute value of the hue angle difference | Δh _n | is desirably 0. Therefore, the lower limit of the value should be changed, and ideally, 0.00 to 12.43 should be selected. Is more preferable,
It is very preferable to select 0.00 or more and 9.25 or less.
It is much more preferable to select 0.00 or more and 7.00 or less,
It is much more preferable to select 0.00 or more and 5.00 or less.

  Regarding the color appearance, the color appearance realized by the light-emitting device that “can realize a natural, lively, highly visible, comfortable, color appearance and the appearance of an object” is based on the above condition I. It can also be understood from the above that the condition IV is quantified as simultaneously satisfying the condition IV.

<Detailed description 2>
It was confirmed by a comparative visual experiment that the light emitted from the light-emitting devices described in Experimental Examples 1 to 52 was superior to the color appearance of the light-emitting devices that emit the experimental reference light. At the same time, it was confirmed that the light source efficiency η was significantly improved as follows. Table 8 summarizes the A _cg values and the light source efficiency η of Comparative Experimental Example 2 and Reference Experimental Example 1 shown in Table 2.

On the other hand, Table 9, from the experimental examples shown in Table 3 to Table 7, T _SSL from 3800K 4200 K
, Extract all the light emitting devices whose D _uvSSL is -0.0125 or more and -0.0100 or less,
This is to make the comparison with Comparative Experimental Example 2 and Reference Experimental Example 1 as fair as possible. Table 9 summarizes the values derived from Experimental Examples 1, 2, 3, 19, 21, 23, 41, and 42. According to Table 8, the average value of A _cg is -51.8, the average value of eta is was 47.0 (lm / W), the average value Tasu51.4 of Table 9 A _cg, eta Was 65.5 (lm / W).
On the average, the light emitting device shown in Table 8 and the light emitting device shown in Table 9 do not show a large difference in the color appearance of the illumination target. Here, it can be seen that the light source efficiency of the light emitting device of the present embodiment shown in Table 9 was increased by about 39% compared to the conventional light emitting device shown in Table 8.

<Detailed Explanation 3>
Tables 10 to 15 summarize the comparative experimental examples (rank-1 to rank-5) of this embodiment from the following viewpoints. Further, FIGS. 15 to 27 illustrate the spectral distribution and the CIELAB color space from the respective tables.

Table 10 shows that, although a suitable blue semiconductor light emitting device, a suitable broadband green phosphor, and a suitable red phosphor are used, “D _uvSSL is smaller than _−0.0220 and A _cg is −10 or less. “Case”.

Table 11 shows that although an appropriate blue semiconductor light emitting device and an appropriate red phosphor were used, and A _cg was also in an appropriate range, “a yellow phosphor was used as a light emitting element in the intermediate wavelength region, and as a result, φSSL _-BG-min / φSSL _-BM-max is smaller than 0.225 ”.

Table 12, suitable blue semiconductor light emitting element, and using the appropriate red phosphor, D _UvSSL also
Although A _{cg is} also in an appropriate range, “the narrow band green phosphor is used as the light emitting element in the intermediate wavelength region, so that φ _SSL-BG-min / φ _SSL-BM-max is smaller than 0.225. In the case where it has been lost. "

Table 13 shows that, while using an appropriate blue semiconductor light emitting device, an appropriate broadband green phosphor, and an appropriate red phosphor, and A _cg is also in an appropriate range, “D _uvSSL and φ _SSL-BG that characterize the spectral distribution” _-min / φ _SSL-BM-max or λ _SSL-RM-max is not appropriate ”.

Table 14 shows "when D _uvSSL is greater than _-0.007 and A _cg is greater than +120", although an appropriate blue semiconductor light emitting device, an appropriate broadband green phosphor, and an appropriate red phosphor are used. Is exemplified.

Table 15 shows that “φ _SSL-BG-min / φ _SSL-BM ”, although using an appropriate blue semiconductor light emitting element, an appropriate broadband green phosphor, and an appropriate red phosphor, and A _cg is also in an appropriate range. _-max is greater than _0.7000 and D _uvSSL is greater than -0.007 ".

From these results, it can be seen that the spectral distribution φ _SSL as the light-emitting device is as shown in Condition 1, Condition 2, Condition 3,
Unless all of Condition 4 is satisfied, a light-emitting device that achieves both “natural, lively, highly visible, comfortable, color appearance, object appearance” and “light source efficiency improvement” cannot be realized. I understand. Further, a light-emitting device whose spectral distribution φ _SSL does not satisfy at least one of the conditions 1, 2, 3, and 4 does not satisfy at least one of the conditions I to IV relating to color appearance, and simultaneously performs comparison. It can also be seen that in the visual experiment, it was classified into any of rank-1 to rank-5.

  Further, regarding the light-emitting elements constituting the light-emitting device, when a narrow-band green phosphor and a yellow phosphor are used, "natural, lively, highly visible, comfortable, color appearance, A light-emitting device that achieves both "appearance" and "improvement in light source efficiency" could not be realized. It can be seen that they did not satisfy at least one of the conditions I to IV regarding the color appearance, and at the same time, were classified as rank-4 in the comparative visual experiment.

Further details are as follows.
In Comparative Experimental Example 3, Comparative Experimental Example 4, and Comparative Experimental Example 5 corresponding to “ _Case where D _uvSSL is smaller than _−0.0220 and A _cg is −10 or less” shown in Table 10, the spectroscopy is performed. The distribution and CIELAB plots are illustrated in FIGS. 15, 16 and 17, respectively. Each of these had the following problems.
In Comparative Experimental Example 3 (see FIG. 15), in the comparative visual experiment, "it looked excessively brilliant". These are considered to correspond to the fact that the degree of improvement in the degree of saturation shown in the CIELAB plot shown in FIG. 15 was excessive. Furthermore, it is considered that this essence is due to both D _uvSSL and A _cg being excessively negative.
In Comparative Experimental Example 4 (see FIG. 16) and Comparative Experimental Example 5 (see FIG. 17), in the comparative visual experiment, "some colors look vivid, but some colors look dull". These are consistent with the fact that the degree of improvement in the degree of saturation in the CIELAB plots shown in FIGS. 16 and 17 is relatively uneven in each color chart, and in some hues tends to be less saturated than the reference light. it is conceivable that. Further, in some color patches, the hue angle is excessively changed, and the change in color itself is too large.

On the other hand, as shown in Table 11, “the yellow phosphor was used as the light emitting element in the intermediate wavelength region, and as a result, φ _SSL-BG-min / φ _SSL-BM-max became smaller than 0.225. And “the narrow band green phosphor was used as the light emitting element in the intermediate wavelength region” shown in Table 12, and as a result, φ _SSL-BG-min / φ _SSL-BM-max was 0.225 or less. 18 and 19 show the spectral distribution and CIELAB plots of Comparative Experimental Example 7 and Comparative Experimental Example 10, respectively. Each of these had the following problems.
In these comparative visual experiments, "some colors were excessively brilliant, some colors appeared excessively dull, and the difference caused a considerable discomfort in the color appearance." These tend to be consistent with the CLELAB plots shown in FIGS. Further, this essence is, as in Comparative Experimental Example 7 (see FIG. 18) and Comparative Experimental Example 10 (see FIG. 19), a spectral distribution derived from the blue semiconductor light emitting element and a phosphor responsible for light emission in each intermediate wavelength region. In the “region where the spectral intensity is weak from about 465 nm to 525 nm” formed between the spectral distribution of the light source and the spectral distribution, the spectral intensity is excessively low. This is probably because the saturation increased while the saturation decreased for another hue. Further, in some color patches, the hue angle is excessively changed, and the change in color itself is too large.
Conversely, it is considered preferable to use a broadband green phosphor as a light emitting element because these problems can be easily solved.

Comparative experimental example 6 shown in Table 11 corresponding to “when the value of φ _SSL-BG-min / φ _SSL-BM-max is excessively smaller than 0.2250” (not shown, φ _{SSL-BG-max min} / φSSL _-BM-max = 0.1033), Comparative Example 10 shown in Table 12 (FIG. 19, φSSL _-BG-min / φSSL _-BM-max = 0.097), and Table 13 Comparative Experimental Example 15 shown (FIG. 20, φ _SSL-BG-min / φ _SSL-BM-max = 0.105) and Comparative Experimental Example 18 (FIG. 22, φ _SSL-BG-min / φ _{SSL-BM) -max} = 0.1761), mathematically derived even if condition 1 (A _cg value), condition 2 (D _uvSSL value), and condition 4 (λ _SSL-RM-max value) are satisfied. The color appearance of the specific fifteen modified Munsell color chart has a tendency of excessive saturation and a part of excessive desaturation. In addition, when a comparative visual experiment was performed using these light emitting devices, the rank was -4.

As a means for avoiding a situation where φ _SSL-BG-min / φ _SSL-BM-max is excessively small, the following measures can be considered. First, as a first means, it is possible to use a broadband green phosphor. When the broadband green phosphor is used, it is possible to avoid the situation where φ _SSL-BG-min / φ _SSL-BM-max shown in Comparative Experimental Example 6 and Comparative Experimental Example 10 is excessively small.

As a second means for avoiding a situation where φ _SSL-BG-min / φ _SSL-BM-max is excessively small, a blue semiconductor light emitting device having a proper wavelength after using a broadband green phosphor is used. May be used. In this embodiment, a blue semiconductor light emitting device having a dominant wavelength at the time of pulse driving of 445.0 nm or more and 475.0 nm or less can be selected from the experimental example, and more preferably a pulse of 447.5 nm or more and 470.0 nm or less. A blue semiconductor light emitting device having a dominant wavelength at the time of driving can be selected, and a blue semiconductor light emitting device having a dominant wavelength at the time of pulse driving of particularly preferably 457.5 nm ± 2.5 nm can be selected.

In order to prevent φ _SSL-BG-min / φ _SSL-BM-max from becoming excessively small, it can be considered that λ _CHIP-BM-dom is preferably made to have a longer wavelength, but this is not correct. . The preferred range of λ _CHIP-BM-dom is as described above. This is for the following reason.
First, a blue semiconductor light emitting device is an AlGaInN-based semiconductor light emitting device mainly grown epitaxially on a sapphire substrate, a Si substrate, a SiC substrate, or a GaN substrate. Ie, λ _CHIP-BM-dom . Here, for example, an InGaN quantum well layer is considered. Since the In composition of the quantum well layer having a sufficient spectral intensity of 465 nm or more and 525 nm or less has such a high concentration that the internal quantum efficiency is reduced as compared with the condition where the internal quantum efficiency is highest, the “color appearance and It is not preferable from the viewpoint of achieving a balance between the light source efficiency of the light emitting device.
In addition, considering the color appearance, mathematically, when the wavelength of λ _CHIP-BM-dom becomes excessively long and the spectral intensity derived from the light emitting element does not exist in the appropriate part of the short wavelength region of φ _SSL (λ), The color appearance of the specific 15-corrected Munsell color chart that is derived tends to be excessively saturated and partially excessively unsaturated. More specifically, a saturation / non-saturation tendency occurs in a color chart different from that when φ _SSL-BG-min / φ _SSL-BM-max becomes excessively small. Therefore, in order not to make φ _SSL-BG-min / φ _SSL-BM-max excessively small, it is not preferable to make λ _CHIP-BM-dom excessively long.

Further, the following can be considered as a third means for avoiding a situation where φ _SSL-BG-min / φ _SSL-BM-max is excessively small. Specifically, the first λ _CHIP-BM-dom is set using a blue semiconductor light emitting element having a dominant wavelength at the time of pulse driving of 445.0 nm or more and 475.0 nm or less,
In addition, when a yellow phosphor or a narrow band green phosphor is used as the light emitting element in the intermediate wavelength region, a light emitting element may be further added in a range of 465 nm to 525 nm extending over the short wavelength region and the intermediate wavelength region. I can imagine. For this purpose, AlGaInN having a second λ _{CHIP-BM-dom in} which the center of the spectral distribution exists in the region of 465 nm or more and 525 nm or less.
A blue-green semiconductor light-emitting element, a yellow-green light-emitting element of GaP on a GaP substrate having a second λ _CHIP-BM-dom (peak wavelength of about 530 nm to 570 nm), and the like can be added. Furthermore, it is also possible to mix a broadband green phosphor here.
However, in the light emitting device of the present embodiment, it is important to improve the light source efficiency together with the appearance of the color of the illumination target. Is not always preferable because it may lead to From this viewpoint, it is not preferable to use a yellow phosphor or a narrow-band green phosphor as the light emitting element in the intermediate wavelength region and further add another light emitting element. That is, in the light emitting device of the present embodiment, it is possible to use a yellow phosphor or a narrow band green phosphor, but it is not necessarily preferable, and a broadband green phosphor is used as the light emitting element in the intermediate wavelength region. Things are preferred.

"D _uvSSL , φ _SSL-BG-min / φ _SSL-BM-max , which characterizes the spectral distribution shown in Table 13
In cases where any one of λ _SSL-RM-max is not appropriate ”, the spectral distribution and the CIELAB plots are shown in FIGS. 20, 21, and FIG. 22. Each of these had the following problems.
In Comparative Experimental Example 15 (see FIG. 20) and Comparative Experimental Example 18 (see FIG. 22), in the comparative visual experiment, “some colors are excessively bright, some colors appear excessively dull, and the difference is The color looks quite strange. " According to these, the degree of change in the degree of saturation shown in the CIELAB plots shown in FIGS. 20 and 22 is such that the degree of saturation is higher than the reference light depending on the hue of the illumination object, while the degree of saturation is lower in another hue. Is considered to be consistent with It is considered that this is because φ _SSL-BG-min / φ _SSL-BM-max were excessively small.

In Comparative Experimental Example 16 (see FIG. 21), in the comparative visual experiment, "some colors look vivid, but some colors look dull". These are considered to be consistent with the fact that the degree of improvement in the degree of saturation in the CIELAB plot shown in FIG. 21 is relatively uneven, and that some of the hues tend to be less saturated than the reference light. This is considered to be because λ _SSL-RM-max was on the shorter wavelength side than the appropriate range. Further, in some color patches, the hue angle is excessively changed, and the change in color itself is too large.

In Comparative Experimental Example 19, Comparative Experimental Example 22, and Comparative Experimental Example 23 corresponding to “when D _uvSSL is greater than _−0.007 and A _cg is greater than +120”, the spectral distribution is shown. And CIELAB plots are illustrated in FIGS. 23, 24 and 25, respectively. Each of these had the following problems.

In Comparative Experimental Example 19 (see FIG. 23) and Comparative Experimental Example 22 (see FIG. 24), in the comparative visual experiment, it was determined that “the entire image looked dull”. These are considered to be consistent with the fact that the degree of change in the degree of saturation shown in the CIELAB plots shown in FIG. 23 and FIG. This essence is D _uvSSL
And A _cg were considered to be excessively large values. On the other hand, in Comparative Experimental Example 23 (see FIG. 25), it was determined in the comparative visual experiment that “the improvement of color appearance was not felt. The color appearance was poor for some colors”. These are considered to be consistent with the fact that the degree of change in the degree of saturation shown in the CIELAB plot shown in FIG. 25 is small, and is about the same as the reference light. It is considered that this is because _DuvSSL and A _cg were excessively large values.

Comparative experiment example 26, which corresponds to the case where “φ _SSL-BG-min / φ _SSL-BM-max is greater than _0.7000 and D _uvSSL is greater than _−0.007 ” shown in Table 15 In Experimental Example 27, the spectral distribution and the CIELAB plot are illustrated in FIGS. 26 and 27, respectively. Each of these had the following problems.

In Comparative Experimental Example 26 (see FIG. 26) and Comparative Experimental Example 27 (see FIG. 27), in the comparative visual experiment, “the whole looks dull” and “some colors appear vivid, The colors were dull. " These results show that the degree of change in the degree of saturation shown in the CIELAB plot shown in FIG. 26 tends to be non-saturation irrespective of the hue of the illumination object, and in FIG. This is considered to be consistent with the fact that the light is relatively uneven, and that in some hues, the light tends to be less saturated than the reference light. It is considered that this is because φ _SSL-BG-min / φ _SSL-BM-max is excessively large and D _uvSSL is excessively large. The ranks in the comparative visual experiment are lower at −5 and −2 in Comparative Experimental Example 26 and Comparative Experimental Example 27, respectively. Therefore, in order to realize the light emitting device of the present embodiment that achieves “a balance between color appearance and light source efficiency of the light emitting device”, φ _SSL-BG-min / φ _SSL-BM-max is more than sufficiently controlled. There is a need. In Comparative Experimental Example 26 and Comparative Experimental Example 27, it is considered that a problem was that irregularities of an appropriate size were not formed in a region from 465 nm to 525 nm in the spectral distribution, and the irregularities were too small.
Similarly, φ _SSL-BG-min / φ _SSL-RM-max must be controlled more than enough. Generally speaking, the appropriate ranges of φ _SSL-BG-min / φ _SSL-BM-max and φ _SSL-BG-min / φ _SSL-RM-max are set in order to achieve the effects of the present embodiment. This shows that it is important to have irregularities of an appropriate size at appropriate positions in the spectral distribution φ _SSL (λ) of the device.

[Embodiment Examination with Light-Emitting Device Having Multiple Light-Emitting Regions]
Hereinafter, the present invention will be described in more detail with reference to examples.
In the embodiment, a light emitting device having a plurality of light emitting regions is assumed, and how the color appearance of the light emitting device changes by adjusting the radiant flux (luminous flux) of each light emitting region is examined. Was. That is, indices A _cg , CCT (K), D _uvSSL , radiation efficiency K (lm / W), λ _SSL-BM-max , φ _{SSL-BG of} light emitted from each light emitting region and light emitting device in the main radiation direction. Numerical features such as _-min / φ _SSL-BM-max , λ _SSL-RM-max , φ _SSL-BG-min / φ _SSL-RM-max were extracted. at the same time,
Regarding the difference between the color appearance of the 15 color patches assuming illumination with the calculation reference light and the color appearance of the 15 color patches assuming illumination with the actually measured test light spectral distribution, | Δh _n |
, SAT _ave , ΔC _n , | ΔC _max −ΔC _min | | Δh _n |,
The value of ΔC _n changes when n is selected. Here, the maximum value and the minimum value are shown. These values are also shown in Tables 16 to 22.

Specifically, by changing the amount of luminous flux emitted from each light emitting region in the main radiation direction and / or the amount of radiant flux, φ which is the sum of the spectral distributions of light emitted in the main radiation direction from each light emitting region. We examined how _SSL (λ) changes.

Example 1
As shown in FIG. 28, a 5 mm diameter resin package 10 having a total of two light emitting units is prepared. Here, in the light emitting region 11, a blue semiconductor light emitting element (dominant wavelength 452.5 nm), green phosphor (LuAG, peak wavelength 530 nm, full width at half maximum 104 nm), red phosphor (CASN, peak wavelength 645 nm, full width at half maximum 89 nm) Is mounted and sealed. In addition, the blue semiconductor light emitting element in the light emitting region 1 configures the wiring of the package LED so as to have one independent circuit configuration, and is coupled to a power supply. On the other hand, in the light emitting region 12, a blue semiconductor light emitting element (dominant wavelength 452.5 nm), a green phosphor (LuAG, peak wavelength 530 nm, full width at half maximum 104 nm), a red phosphor (CASN, peak wavelength 645 nm, (Full width at half maximum: 89 nm) is mounted and sealed. In addition, the blue semiconductor light emitting element in the light emitting region 2 configures the wiring of the package LED so as to have one independent circuit configuration, and is coupled to another independent power supply. As described above, the light emitting region 11 and the light emitting region 12 can be independently supplied with current.
Next, if the current value to be injected into each light emitting region of the package LED 10 having the light emitting region 11 and the light emitting region 12 is appropriately adjusted, for example, the five types shown in FIGS. Is realized. FIG. 29 shows a case where current is injected only into the light emitting region 11 and the radiant flux ratio between the light emitting region 11 and the light emitting region 12 is set to 3: 0. In contrast, FIG. In this case, the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is set to 0: 3. Further, FIG. 30 shows a case where the radiant flux ratio between the light emitting region 11 and the light emitting region 12 is 2: 1, FIG. 31 shows a case where the radiant flux ratio is 1.5: 1.5, and FIG. Shown in As described above, by changing the current injected into each region of the package LED 10,
The radiant flux radiated on the axis from the package LED body can be changed. Also, the CIELAB plots shown in the figures mathematically assume that the 15 types of modified Munsell color patches # 01 to # 15 are used as the illumination target, and illuminate with the package LED and the package LED. The a ^* value and the b ^* value when illuminated with reference light derived from the correlated color temperature are plotted. Here, the driving point names from the driving point A to the driving point E are given to the radiant flux as the light emitting device in descending order of the radiant flux contribution of the light emitting region 11. FIG. 34 shows the chromaticity points from the driving points A to E on the CIE 1976 u'v 'chromaticity diagram. On the other hand, expected photometric characteristics and colorimetric characteristics at each driving point are summarized in Table 16.

The following can be seen from the spectral distributions of FIGS. 29 to 33, the CIELAB plots of FIGS. 29 to 33, the CIE 1976 u'v 'chromaticity diagrams of FIG. 34, and Tables 16-1 and 16-2.
Between driving point A to driving point E and further between them, natural, lively, high visibility, comfortable, color appearance, object appearance and high light source efficiency can be achieved as viewed outdoors. It is considered possible. Therefore, for example, between the driving point A and the driving point E, the correlated color temperature of the package LED can be changed from 3207K to 4204K while realizing such color appearance, and D _uvSSL is also from _-0.0072 to-. Variable up to 0.0155. Further, the average saturation of the 15 types of modified Munsell color charts is also variable from 1.95 to 2.32. In this way, in an area where good color appearance and high light source efficiency can be achieved at the same time, it is considered more optimal according to the age and gender of the user of the light emitting device, and according to the lighting space, purpose, and the like. The lighting conditions to be used can be easily selected from the variable range.
In this case, it is also possible to perform the following drive control.
First, when at least one of the index A _cg , the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation trajectory is changed, the light flux emitted from the light emitting device in the main radiation direction and And / or the radiant flux can be unchanged. Such control is preferable because it is possible to easily check the difference in the color appearance due to the shape change of the spectral distribution without depending on the illuminance of the illumination target.
Secondly, when the index A _cg is reduced in an appropriate range, control can be performed to reduce the luminous flux and / or radiant flux of the light emitting device to lower the illuminance of the illumination target. Thirdly, even when the D _uvSSL is reduced within an appropriate range, the luminous flux and / or the radiant flux of the light emitting device can be reduced to control the illuminance of the illumination target to be reduced. In these second and third cases, the sense of brightness generally increases in many cases. Therefore, it is possible to reduce the illuminance to suppress energy consumption, which is preferable.
Fourth, when increasing the correlated color temperature, it is possible to increase the luminous flux and / or radiant flux of the light emitting device to increase the illuminance of the illumination target. Under a general lighting environment, it is often determined that a low color temperature region is comfortable in a relatively low illuminance environment, and a high color temperature region is determined to be relatively comfortable in a high illuminance environment. Often. Such a psychological effect is known as the Kruzov effect, but it is also possible to perform control incorporating such an effect. When raising the correlated color temperature, the luminous flux and / or Alternatively, it is preferable to increase the radiant flux to increase the illuminance of the illumination target.

Example 2
As shown in FIG. 35, a ceramic package 20 in which a light emitting portion having a diameter of 7 mm is divided into a total of six small light emitting portions is prepared. Here, a blue semiconductor light emitting element (dominant wavelength 463 nm), a green phosphor (LuAG, peak wavelength 530 nm, full width at half maximum 104 nm), and a red phosphor (CASN, peak wavelength 645 nm, full width at half maximum 89 nm) are mounted in the light emitting region 21. , To form an equivalent light emitting region. Further, the semiconductor light emitting elements of the plurality of light emitting areas 21 are connected in series and coupled to one independent power supply. On the other hand, in the light emitting region 22, a blue semiconductor light emitting element (dominant wavelength 453 nm), a green phosphor (LuAG, peak wavelength 530 nm, full width at half maximum 104 nm), and a red phosphor (CASN, peak wavelength 645 nm, full width at half maximum 89 nm) are adjusted differently. ) Is mounted and sealed to form an equivalent light emitting region. Further, the semiconductor light emitting devices of the plurality of light emitting regions 22 are connected in series and connected to another independent power source. Further, in the light emitting region 23, a blue semiconductor light emitting element (a dominant wavelength of 455 nm), a green phosphor (LuAG, a peak wavelength of 530 nm, a full width at half maximum of 104 nm) and a red phosphor which are adjusted differently from any of the light emitting region 21 and the light emitting region 22 are provided. (CASN, peak wavelength: 645 nm, full width at half maximum: 89 nm), and sealed to form an equivalent light emitting region. Further, the semiconductor light emitting elements of the plurality of light emitting areas 23 are connected in series and connected to another independent power supply. Here, the light-emitting region 21, the light-emitting region 22, and the light-emitting region 23 are configured so that current can be independently injected.
Next, if the current value to be injected into each light emitting region of the package LED having the light emitting region 21, the light emitting region 22, and the light emitting region 23 is appropriately adjusted, for example, the light emitted on the axis of the package LED is shown in FIGS. The following four types of spectral distributions are realized. FIG. 36 shows a case where current is injected only into the light emitting region 21 and the radiant flux ratio of the light emitting region 21, the light emitting region 22, and the light emitting region 23 is set to 3: 0: 0. FIG. 37 shows a case where current is injected only into the light emitting region 22 and the radiant flux ratio of the light emitting region 21, the light emitting region 22, and the light emitting region 23 is set to 0: 3: 0. FIG. 38 shows a case where current is injected only into the light emitting region 23 and the radiant flux ratio of the light emitting region 21, the light emitting region 22, and the light emitting region 23 is set to 0: 0: 3. Finally, FIG. 39 shows a case where a current is injected into all the light emitting regions of the light emitting region 21, the light emitting region 22, and the light emitting region 23, and the radiant flux ratio is set to 1: 1: 1. As described above, by changing the current injected into each region of the package LED 20 shown in FIG. 35, the radiant flux radiated on the axis from the package LED body can be changed. Also, the CIELAB plots shown in the figures mathematically assume that the 15 types of modified Munsell color patches # 01 to # 15 are used as the illumination target, and illuminate with the package LED and the package LED. The a ^* value and the b ^* value when illuminated with reference light derived from the correlated color temperature are plotted. Here, the drive points from the drive point A to the drive point D are given to the radiant flux as the light emitting device. FIG. 40 shows the chromaticity points from the driving points A to D on the CIE 1976 u'v 'chromaticity diagram. On the other hand, expected photometric characteristics and colorimetric characteristics at each driving point are summarized in Table 17.

The following can be seen from the spectral distributions of FIGS. 36 to 39, the CIELAB plots of FIGS. 36 to 39, the CIE 1976 u'v 'chromaticity diagrams of FIG. 40, and Tables 17-1 and 17-2.
It is considered that the driving points A to C can achieve both natural, lively, highly visible, comfortable, color appearance, object appearance, and high light source efficiency as viewed outdoors. In addition, even at the driving point D existing in the range surrounded by the driving points A to C, a natural, lively, highly visible, comfortable, color appearance as seen outdoors can be obtained. It is thought that it is possible to achieve both the appearance of an object and high light source efficiency. Therefore, for example, in a range surrounded by the driving points A, B, and C, and in the vicinity of the range, the correlated color temperature of the package LED is realized while realizing such color appearance. Variable from 2934K to 3926K, _DuvSSL is _also-
It can be varied from 0.0104 to -0.0073. Further, the average saturation of the 15 types of modified Munsell color charts is also variable from 0.94 to 1.91. In this way, in a region where good color appearance and high light source efficiency can be achieved at the same time, it is more optimal according to the age, gender, etc. of the user of the light emitting device, and according to the lighting space, purpose, etc. Possible lighting conditions can be easily selected from a variable range.
In particular, in the present embodiment, since three kinds of light emitting regions having different color adjustments are provided in one light emitting device, compared with a case where two kinds of light emitting regions having different color adjustments are provided in one light emitting device. This is preferable because the variable range can be secured widely.
In this case, it is also possible to perform the following drive control.
First, when at least one of the index A _cg , the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation trajectory is changed, the light flux emitted from the light emitting device in the main radiation direction and And / or the radiant flux can be unchanged. Such control is preferable because it is possible to easily check the difference in the color appearance due to the shape change of the spectral distribution without depending on the illuminance of the illumination target.
Secondly, when the index A _cg is reduced in an appropriate range, control can be performed to reduce the luminous flux and / or radiant flux of the light emitting device to lower the illuminance of the illumination target. Thirdly, even when the D _uvSSL is reduced within an appropriate range, the luminous flux and / or the radiant flux of the light emitting device can be reduced to control the illuminance of the illumination target to be reduced. In these second and third cases, the sense of brightness generally increases in many cases. Therefore, it is possible to reduce the illuminance to suppress energy consumption, which is preferable.
Fourth, when increasing the correlated color temperature, it is possible to increase the luminous flux and / or radiant flux of the light emitting device to increase the illuminance of the illumination target. Under a general lighting environment, it is often determined that a low color temperature region is comfortable in a relatively low illuminance environment, and a high color temperature region is determined to be relatively comfortable in a high illuminance environment. Often. Such a psychological effect is known as the Kruzov effect, but it is also possible to perform control incorporating such an effect. When raising the correlated color temperature, the luminous flux and / or Alternatively, it is preferable to increase the radiant flux to increase the illuminance of the illumination target.

Example 3
As shown in FIG. 41, a light-emitting device that is a lighting system in which a total of 90 (9 × 10) LED bulbs as light-emitting units are embedded in a ceiling is prepared. Here, a solid hatched portion in the figure mounts an equivalent LED bulb as the light emitting region 31 to form an equivalent light emitting region. In the figure, a hatched portion indicated by a dotted line is provided with an equivalent LED bulb as the light emitting region 32 to form an equivalent light emitting region. Here, the LED bulbs mounted on the plurality of light emitting areas 31 are connected in parallel and connected to one independent power source. On the other hand, the LED bulbs mounted on the plurality of light emitting areas 32 are connected in parallel and connected to another independent power source. The light emitting region 31 and the light emitting region 32 can be driven independently. The LED bulb forming the light emitting region 31 is a blue semiconductor light emitting element (a dominant wavelength of 446 nm), a yellow phosphor (YAG, a peak wavelength of 545 nm, a full width at half maximum of 108 nm), and a red phosphor (SCASN, a peak wavelength of 640 nm, a full width at half maximum of 90 nm). And the LED bulb forming the light emitting region 32 includes a blue semiconductor light emitting element (dominant wavelength 450 nm), a green phosphor (LuAG, peak wavelength 530 nm, full width at half maximum 104 nm), a red phosphor (CASN, peak wavelength) 645 nm, full width at half maximum 89 nm).
Next, when the radiant flux of the LED bulbs constituting the light emitting region 31 and the light emitting region 32 is appropriately adjusted using a dimming controller mounted on an independent power source, for example, the light emitted on the central axis of the lighting system is obtained. The five types of spectral distributions shown in FIGS. FIG. 42 shows a case where only the LED bulbs constituting the light emitting region 31 are driven and the radiant flux ratio between the light emitting region 31 and the light emitting region 32 is set to 90: 0. FIG. In this case, only the LED light bulb is driven, and the radiant flux ratio between the light emitting region 31 and the light emitting region 32 is set to 0:90. Further, FIG. 43 shows the case where the luminous flux ratio of the LED bulb constituting the light emitting region 31 and the LED bulb constituting the light emitting region 32 is 70:20, FIG. 44 shows the case where the radiant flux ratio is 45:45, and FIG. FIG. As described above, by changing the driving conditions of the LED bulbs constituting each light emitting region, the radiant flux emitted on the central axis of the illumination system can be changed.
Also, the CIELAB plots shown in each figure mathematically assume that 15 types of modified Munsell color patches # 01 to # 15 are used as the illumination target, and that the illumination is performed by the light emitting device that is the illumination system. It is a plot of a ^* value and b ^* value when illuminated with reference light derived from a correlated color temperature of a light emitting device as the illumination system. Here, the drive points from the drive point A to the drive point E are given to the radiant flux as the lighting system (light emitting device) in descending order of the contribution of the radiant flux of the LED bulb constituting the light emitting area 31. FIG. 47 shows the chromaticity points from the driving points A to E on the CIE 1976 u'v 'chromaticity diagram. On the other hand, expected photometric characteristics and colorimetric characteristics at each driving point are summarized in Table 18.

From the spectral distributions of FIGS. 42 to 46, the CIELAB plots of FIGS. 42 to 46, the CIE 1976 u'v 'chromaticity diagrams of FIG. 47, and Tables 18-1 and 18-2, the following can be understood.
At the driving points A and B, at least one of φ _SSL-BG-min / φ _SSL-BM-max and λ _SSL-RM-max does not fall within the appropriate range of the present invention. The driving point D, the driving point E, and the vicinity thereof, as well as in the vicinity thereof, have a natural, lively, highly visible, comfortable, color appearance, an object appearance and a high light source efficiency as viewed outdoors. It is considered that both are possible. Therefore, for example, between the driving point C and the driving point E, the correlated color temperature as the lighting system can be varied from 3146K to 3544K while realizing such color appearance, and D _uvSSL is also _-0.1 .
It can be varied from 0121 to -0.0116. Further, the average saturation of the 15 types of modified Munsell color charts is also variable from 1.65 to 2.17. In this way, in an area where good color appearance and high light source efficiency can be achieved at the same time, it is considered more optimal according to the age and gender of the user of the light emitting device, and according to the lighting space, purpose, and the like. The lighting conditions to be used can be easily selected from the variable range.
In this case, it is also possible to perform the following drive control.
First, when at least one of the index A _cg , the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation trajectory is changed, the light flux emitted from the light emitting device in the main radiation direction and And / or the radiant flux can be unchanged. Such control is preferable because it is possible to easily check the difference in the color appearance due to the shape change of the spectral distribution without depending on the illuminance of the illumination target.
Secondly, when the index A _cg is reduced in an appropriate range, control can be performed to reduce the luminous flux and / or radiant flux of the light emitting device to lower the illuminance of the illumination target. Thirdly, even when the D _uvSSL is reduced within an appropriate range, the luminous flux and / or the radiant flux of the light emitting device can be reduced to control the illuminance of the illumination target to be reduced. In these second and third cases, the sense of brightness generally increases in many cases. Therefore, it is possible to reduce the illuminance to suppress energy consumption, which is preferable.
Fourth, when increasing the correlated color temperature, it is possible to increase the luminous flux and / or radiant flux of the light emitting device to increase the illuminance of the illumination target. Under a general lighting environment, it is often determined that a low color temperature region is comfortable in a relatively low illuminance environment, and a high color temperature region is determined to be relatively comfortable in a high illuminance environment. Often. Such a psychological effect is known as the Kruzov effect, but it is also possible to perform control incorporating such an effect. When raising the correlated color temperature, the luminous flux and / or Alternatively, it is preferable to increase the radiant flux to increase the illuminance of the illumination target.

Example 4
As in the third embodiment, as shown in FIG. 41, a light emitting device as a lighting system in which a total of 90 (9 × 10) LED light bulbs as light emitting units are embedded in a ceiling is prepared. The LED bulb forming the light emitting region 31 is a commercially available LED bulb including a blue semiconductor light emitting element and a yellow phosphor as light emitting elements, the LED bulb forming the light emitting region 32 is a violet semiconductor light emitting element (a dominant wavelength of 408 nm), Includes blue phosphor (SBCA, peak wavelength 455 nm, full width at half maximum 54 nm), green phosphor (β-SiAlON, peak wavelength 545 nm, full width at half maximum 55 nm), and red phosphor (CASON, peak wavelength 645 nm, full width at half maximum 99 nm). it can.
Next, when the radiant flux of the LED light bulbs constituting the light emitting area 31 and the light emitting area 32 is appropriately adjusted using a dimming controller mounted on an independent power source, for example, the light emitted on the central axis of the lighting system is obtained. The five types of spectral distributions shown in FIGS. FIG. 48 shows a case in which only the LED bulb constituting the light emitting region 31 is driven and the radiant flux ratio between the light emitting region 31 and the light emitting region 32 is set to 90: 0. FIG. In this case, only the LED light bulb is driven, and the radiant flux ratio between the light emitting region 31 and the light emitting region 32 is set to 0:90. Further, FIG. 49 shows a case where the luminous flux ratio of the LED bulb constituting the light emitting region 31 and the LED bulb constituting the light emitting region 32 is 70:20, FIG. 50 shows a case where the radiant flux ratio is 49:41, and FIG. 51 is shown in FIG. As described above, by changing the driving conditions of the LED bulbs constituting each light emitting region, the radiant flux emitted on the central axis of the illumination system can be changed.
Also, the CIELAB plots shown in each figure mathematically assume that 15 types of modified Munsell color patches # 01 to # 15 are used as the illumination target, and that the illumination is performed by the light emitting device that is the illumination system. It is a plot of a ^* value and b ^* value when illuminated with reference light derived from a correlated color temperature of a light emitting device as the illumination system. Here, the drive points from the drive point A to the drive point E are given to the radiant flux as the lighting system (light emitting device) in descending order of the contribution of the radiant flux of the LED bulb constituting the light emitting area 31. FIG. 53 shows the chromaticity points from the driving points A to E on the CIE 1976 u'v 'chromaticity diagram. On the other hand, expected photometric characteristics and colorimetric characteristics at each driving point are summarized in Table 19.

From the spectral distributions of FIGS. 48 to 52, the CIELAB plots of FIGS. 48 to 52, the CIE 1976 u'v 'chromaticity diagrams of FIG. 53, and Tables 19-1 and 19-2, the following can be understood.
At driving point A, driving point B, driving point D, and driving point E, D _uvSSL , A _cg , φ _SSL-BG-min /
Although at least one of φ _SSL-BM-max and λ _SSL-RM-max does not fall within the proper range of the present invention, the driving point C and its vicinity are natural and lively as viewed outdoors. It is considered that it is possible to achieve both high visibility, comfortable color appearance, object visibility, and high light source efficiency. Although good color appearance is realized at the driving points D and E, and between and around the driving points E, it is considered that a relatively high light source efficiency cannot be realized due to a relatively low radiation efficiency.

Example 5
As shown in FIG. 54, a pair of ceramic package LEDs 40 is prepared by bringing two ceramic packages each having a length of 5 mm and a width of 5 mm, each having one light emitting region, close to each other. Here, the following is performed so that one is a light emitting region 41 and the other is a light emitting region 42. In the light emitting region 41, a blue semiconductor light emitting element (dominant wavelength 453 nm), green phosphor (LuAG, peak wavelength 530 nm, full width at half maximum 104 nm), and red phosphor (CASON, peak wavelength 645 nm, full width at half maximum 99 nm) are mounted and sealed. I do. Also, the light emitting area 41 is coupled to one independent power supply. On the other hand, in the light-emitting region 42, a violet semiconductor light-emitting element (dominant wavelength 408 nm), a blue phosphor (SBCA, peak wavelength 455 nm, full width at half maximum 54 nm), a green phosphor (β-SiAlON, peak wavelength 545 nm, full width at half maximum 55 nm), A red phosphor (CASON, peak wavelength 645 nm, full width at half maximum 99 nm) is mounted and sealed. Also, the light emitting area 42 is coupled to another independent power source. In this way, the light emitting region 41 and the light emitting region 42 can be independently injected with current.
Next, if the current value to be injected into each light emitting region of the pair of package LEDs 40, which is the light emitting region 41 and the light emitting region 42, is appropriately adjusted, for example, FIG. The five types of spectral distributions shown in FIG. 59 are realized. 55 shows a case where current is injected only into the light emitting region 41 and the radiant flux ratio between the light emitting region 41 and the light emitting region 42 is set to 9: 0. On the contrary, FIG. In this case, the luminous flux ratio between the light emitting region 41 and the light emitting region 42 is set to 0: 9. Further, FIG. 56 shows a case where the radiant flux ratio between the light emitting region 41 and the light emitting region 42 is 7: 2, FIG. 57 shows a case where the radiant flux ratio is 4.5: 4.5, and FIG. Shown in In this manner, by changing the current injected into each region of the pair of package LEDs 40, the radiant flux radiated on the central axis from the pair of package LED bodies can be changed.
Also, the CIELAB plots shown in each figure mathematically assume that 15 types of modified Munsell color patches # 01 to # 15 are set as the illumination target, and that the pair of packaged LEDs is illuminated. The a ^* value and the b ^* value when illuminated with reference light derived from the correlated color temperature of a pair of package LEDs are plotted. Here, the drive points from the drive point A to the drive point E are given to the radiant flux as the light emitting device in order of the radiant flux contribution of the light emitting region 41. FIG. 60 shows the chromaticity points from the driving points A to E on the CIE 1976 u'v 'chromaticity diagram. On the other hand, expected photometric characteristics and colorimetric characteristics at each driving point are summarized in Table 20.

The following can be seen from the spectral distributions of FIGS. 55 to 59, the CIELAB plots of FIGS. 55 to 59, the CIE 1976 u'v 'chromaticity diagrams of FIG. 60, and Tables 20-1 and 20-2.
At any one of the driving points C, D, and E, A _cg does not fall within the appropriate range of the present invention. However, at driving point A, driving point B, and between and near the driving points, the relative radiation efficiency is low. Height improves light source efficiency compared to other driving points and realizes natural, lively, highly visible, comfortable, color appearance, and object appearance as seen outdoors it is conceivable that. Therefore, for example, between the driving point A and the driving point B, the correlated color temperature as the package LED can be changed from 3168K to 3365K while realizing such color appearance, and D _uvSSL is also from _-0.0123 to-. It can be changed to 0.0122. Further, the average saturation of the 15 types of modified Munsell color charts is also variable from 1.95 to 1.99. In this way, in an area where good color appearance and high light source efficiency can be achieved at the same time, it is considered more optimal according to the age and gender of the user of the light emitting device, and according to the lighting space, purpose, and the like. The lighting conditions to be used can be easily selected from the variable range. In addition, although good color appearance is realized at the driving points C, D, and E, and between and near the driving points E, a relatively high light source efficiency cannot be realized due to a relatively low radiation efficiency. it is conceivable that.
In this case, it is also possible to perform the following drive control.
First, when at least one of the index A _cg , the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation trajectory is changed, the light flux emitted from the light emitting device in the main radiation direction and And / or the radiant flux can be unchanged. Such control is preferable because it is possible to easily check the difference in the color appearance due to the shape change of the spectral distribution without depending on the illuminance of the illumination target.
Secondly, when the index A _cg is reduced in an appropriate range, control can be performed to reduce the luminous flux and / or radiant flux of the light emitting device to lower the illuminance of the illumination target. Thirdly, even when the D _uvSSL is reduced within an appropriate range, the luminous flux and / or the radiant flux of the light emitting device can be reduced to control the illuminance of the illumination target to be reduced. In these second and third cases, the sense of brightness generally increases in many cases. Therefore, it is possible to reduce the illuminance to suppress energy consumption, which is preferable.
Fourth, when increasing the correlated color temperature, it is possible to increase the luminous flux and / or radiant flux of the light emitting device to increase the illuminance of the illumination target. Under a general lighting environment, it is often determined that a low color temperature region is comfortable in a relatively low illuminance environment, and a high color temperature region is determined to be relatively comfortable in a high illuminance environment. Often. Such a psychological effect is known as the Kruzov effect, but it is also possible to perform control incorporating such an effect. When raising the correlated color temperature, the luminous flux and / or Alternatively, it is preferable to increase the radiant flux to increase the illuminance of the illumination target.

Example 6
As shown in FIG. 61, a ceramic package 50 having a length of 6 mm and a width of 9 mm in which a total of 16 light emitting portions exist is prepared. Here, a blue semiconductor light emitting element (dominant wavelength 448 nm), a green phosphor (LSN, peak wavelength 535 nm, full width at half maximum 107 nm), and a red phosphor (CASN, peak wavelength 660 nm, full width at half maximum 88 nm) are mounted in the light emitting region 51. To form an equivalent light emitting region. Further, the semiconductor light emitting elements of the plurality of light emitting areas 51 are connected in series and connected to one independent power supply. On the other hand, a blue semiconductor light emitting element (dominant wavelength 447 nm), a green phosphor (CSO, peak wavelength 520 nm, full width at half maximum 96 nm), and a red phosphor (SCASN, peak wavelength 625 nm, full width at half maximum 87 nm) are mounted in the light emitting region 52. To form an equivalent light emitting region. Further, the semiconductor light emitting elements of the plurality of light emitting areas 52 are connected in series and coupled to another independent power supply. The light-emitting region 51 and the light-emitting region 52 are configured so that current can be independently injected.
Next, by appropriately adjusting the current value to be injected into each light emitting region of the package LED having the light emitting region 51 and the light emitting region 52, for example, the five types shown in FIGS. Is realized. FIG. 62 shows a case where current is injected only into the light emitting region 51 and the radiant flux ratio between the light emitting region 51 and the light emitting region 52 is set to 16: 0. In contrast, FIG. In this case, the luminous flux ratio between the light emitting region 51 and the light emitting region 52 is set to 0:16. Further, FIG. 63 shows a case where the radiant flux ratio between the light emitting region 51 and the light emitting region 52 is 4:12, FIG. 64 shows a case where it is 3:13, and FIG. 65 shows a case where it is 1:15. Thus, by changing the current injected into each region of the package LED 50, the radiant flux radiated on the axis from the package LED body can be changed.
Also, the CIELAB plots shown in the figures mathematically assume that the 15 types of modified Munsell color patches # 01 to # 15 are used as the illumination target, and illuminate with the package LED and the package LED. The a ^* value and the b ^* value when illuminated with reference light derived from the correlated color temperature are plotted. Here, the driving point names from the driving point A to the driving point E are given to the radiant flux as the light emitting device in descending order of the radiant flux contribution of the light emitting region 51. FIG. 67 shows the chromaticity points from the driving points A to E on the CIE 1976 u'v 'chromaticity diagram. On the other hand, expected photometric characteristics and colorimetric characteristics at each driving point are summarized in Table 21.

From the spectral distributions of FIGS. 62 to 66, the CIELAB plots of FIGS. 62 to 66, the CIE 1976 u'v 'chromaticity diagrams of FIG. 67, and Tables 21-1 and 21-2, the following can be understood.
At the driving point A, the driving point D, and the driving point E, at least one of D _uvSSL , A _cg , φ _SSL-BG-min / φ _SSL-BM-max , and λ _SSL-RM-max is suitable for the present invention. The driving point B, the driving point C, and also between and in the vicinity of the driving point B, the natural, lively, highly visible, comfortable, color appearance as viewed outdoors, It is thought that it is possible to achieve both the appearance of an object and high light source efficiency. Therefore, for example, between and around the driving points B and C, the correlated color temperature of the package LED can be varied from 3968 K to 4164 K while realizing good color appearance, and D _uvSSL can also be set to −0. It can be varied from 0112 to -0.0116. Further, the average saturation of the 15 types of modified Munsell color charts is also variable from 0.89 to 1.11. In this way, in a region where good color appearance and high light source efficiency can be achieved at the same time, it is more optimal according to the age, gender, etc. of the user of the light emitting device, and according to the lighting space, purpose, etc. Possible lighting conditions can be easily selected from a variable range.
In this case, it is also possible to perform the following drive control.
First, when at least one of the index A _cg , the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation trajectory is changed, the light flux emitted from the light emitting device in the main radiation direction and And / or the radiant flux can be unchanged. Such control is preferable because it is possible to easily check the difference in the color appearance due to the shape change of the spectral distribution without depending on the illuminance of the illumination target.
Secondly, when the index A _cg is reduced in an appropriate range, control can be performed to reduce the luminous flux and / or radiant flux of the light emitting device to lower the illuminance of the illumination target. Thirdly, even when the D _uvSSL is reduced within an appropriate range, the luminous flux and / or the radiant flux of the light emitting device can be reduced to control the illuminance of the illumination target to be reduced. In these second and third cases, the sense of brightness generally increases in many cases. Therefore, it is possible to reduce the illuminance to suppress energy consumption, which is preferable.
Fourth, when increasing the correlated color temperature, it is possible to increase the luminous flux and / or radiant flux of the light emitting device to increase the illuminance of the illumination target. Under a general lighting environment, it is often determined that a low color temperature region is comfortable in a relatively low illuminance environment, and a high color temperature region is determined to be relatively comfortable in a high illuminance environment. Often. Such a psychological effect is known as the Kruzov effect, but it is also possible to perform control incorporating such an effect. When raising the correlated color temperature, the luminous flux and / or Alternatively, it is preferable to increase the radiant flux to increase the illuminance of the illumination target.

Comparative Example A resin package LED similar to that of Example 1 was prepared except for the following.
In the light emitting region 11, a blue semiconductor light emitting element (dominant wavelength 438 nm), a green phosphor (β-SiAlON, peak wavelength 545 nm, full width at half maximum 55 nm), and a red phosphor (CASON, peak wavelength 645 nm, full width at half maximum 99 nm) are mounted. And sealing.
In the light emitting region 12, a blue semiconductor light emitting element (dominant wavelength 448 nm), a green phosphor (LSN, peak wavelength 535 nm, full width at half maximum 107 nm), and a red phosphor (CASN, peak wavelength 660 nm, full width at half maximum 88 nm) are mounted. And sealing.
Next, if the current value to be injected into each light emitting region of the package LED having the light emitting region 11 and the light emitting region 12 is appropriately adjusted, for example, the five types shown in FIGS. Is realized. FIG. 68 shows a case where current is injected only into the light emitting region 11 and the radiant flux ratio between the light emitting region 11 and the light emitting region 12 is set to 3: 0. In contrast, FIG. In this case, the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is set to 0: 3. Further, FIG. 69 shows the case where the luminous flux ratio between the light emitting region 11 and the light emitting region 12 is 2: 1, FIG. 70 shows the case where the ratio is 1.5: 1.5, and FIG. Shown in Thus, by changing the current injected into each region of the package LED, the radiant flux radiated on the axis from the package LED body can be changed. Also, the CIELAB plots shown in the figures mathematically assume that the 15 types of modified Munsell color patches # 01 to # 15 are used as the illumination target, and illuminate with the package LED and the package LED. The a ^* value and the b ^* value when illuminated with reference light derived from the correlated color temperature are plotted. Here, the driving point names from the driving point A to the driving point E are given to the radiant flux as the light emitting device in descending order of the radiant flux contribution of the light emitting region 11. FIG. 73 shows the chromaticity points from the driving points A to E on the CIE 1976 u'v 'chromaticity diagram. On the other hand, expected photometric characteristics and colorimetric characteristics at each driving point are summarized in Table 22.

From the spectral distributions of FIGS. 68 to 72, the CIELAB plots of FIGS. 68 to 72, the CIE 1976 u'v 'chromaticity diagrams of FIG. 73, and the tables 22-1 and 22-2, the following can be understood.
At any of the driving points A to E, at least one of D _uvSSL , A _cg , φ _SSL-BG-min / φ _SSL-BM-max , and λ _SSL-RM-max is suitable for the present invention. Out of range. For this reason, in the variable range as a packaged LED, it is possible to achieve both natural, lively, highly visible, comfortable, color appearance, object appearance, and high light source efficiency as viewed outdoors. There is no driving point to be used.

[Discussion]
From the embodiments described above, the following invention matters can be derived.
That is, the spectral distribution of light emitted from each light emitting region in the main radiation direction of the light emitting device is φ _SSL N (λ) (N is 1 to M), and all light emitted from the light emitting device in the radiation direction is used. The spectral distribution φ _SSL (λ) of
In the case of the above, when the amount of light flux and / or the amount of radiant light emitted from the light emitting region is changed so that φ _SSL (λ) can satisfy the following condition, the effect of the present invention is obtained. Is obtained. The following conditions can be similarly applied to the method for designing a light emitting device according to the second embodiment of the present invention and the method for driving the light emitting device according to the third embodiment of the present invention. Condition 1:
The light emitted from the light emitting device includes, in a main radiation direction, light in which a distance D _uvSSL from a black body radiation locus defined by ANSI C78.377 satisfies −0.0220 ≦ D _uvSSL ≦ −0.0070. .
Condition 2:
The standard selected according to φ _SSL (λ) is the spectral distribution of light emitted from the light emitting device in the radiation direction, and the reference color temperature T _SSL (K) is the light emitted from the light emitting device in the radiation direction. Φ _ref (λ), the tristimulus values of the light emitted from the light emitting device in the radiation direction (X _SSL , Y _SSL , Z _SSL ), and the light emitted from the light emitting device in the radiation direction. The reference tristimulus values of light selected according to the correlated color temperature T _SSL (K) of the light are (X _ref , Y _ref , Z _ref )
The light is selected according to the normalized spectral distribution S _SSL (λ) of light emitted from the light emitting device in the radiation direction and the correlated color temperature T _SSL (K) of light emitted from the light emitting device in the radiation direction. The standardized spectral distribution S _ref (λ) of the standard light and the difference ΔS (λ)
S _SSL (λ) = φ _SSL (λ) / Y _SSL
S _ref (λ) = φ _ref (λ) / Y _ref
ΔS (λ) = S _ref (λ) −S _SSL (λ)
Is defined as
When the wavelength giving the maximum value of the longest wavelength of S _SSL (λ) is λ _R (nm) in the wavelength range of 380 nm or more and 780 nm or less, S _SSL (λ _R ) / 2 on the longer wavelength side than λ _R. When there is a wavelength Λ4,
The index A _cg represented by the following equation (1) satisfies −10 <A _cg ≦ 120,
When the wavelength giving the maximum value of the longest wavelength of S _SSL (λ) is λ _R (nm) in the wavelength range of 380 nm or more and 780 nm or less, S _SSL (λ _R ) / 2 on the longer wavelength side than λ _R. When there is no wavelength Λ4,
The index A _cg represented by the following equation (2) satisfies −10 <A _cg ≦ 120.
Condition 3:
The spectral distribution φ _SSL (λ) of the light indicates the maximum value of the spectral intensity in the range of 430 nm to 495 nm as φ _SSL-BM-max , and the minimum value of the spectral intensity in the range of 465 nm to 525 nm as φ _SSL-BG- When defined as _min ,
0.2250 ≤ φ _SSL-BG-min / φ _SSL-BM-max ≤ 0.7000
It is.
Condition 4:
When the maximum value of the spectral intensity in the range of 590 nm or more and 780 nm or less is defined as φ _SSL-RM-max , the wavelength λ _SSL- which gives the φ _SSL-RM-max is defined as the light spectral distribution φ _SSL (λ). _RM-max ,
605 (nm) ≦ λ _SSL-RM-max ≦ 653 (nm)
It is.

In the embodiment, the light emitting device includes two or three types of light emitting regions. However, the number of the light emitting regions is not limited to two or three.
In the case where the number of light emitting regions is two, it is a preferable embodiment because control as a light emitting device is easy.
When there are three types of light-emitting regions, the control region is not linear but planar on the chromaticity coordinates, so that the color appearance can be adjusted over a wide range, which is preferable.
It is preferable to use four or more types of light-emitting regions because, as described above, in addition to controlling the surface on the chromaticity coordinates, the correlated color temperature, D _uvSSL , and color appearance can be controlled independently. Further, the appearance of color can be adjusted without changing the chromaticity, which is preferable.
On the other hand, if the light emitting region exists excessively, the control becomes complicated in an actual light emitting device. Therefore, the light emitting region is preferably 10 or less, more preferably 8 or less.
Further, in the light emitting device of the present invention having a plurality of types of light emitting regions, the following method can be employed to change the amount of luminous flux or radiant flux in various light emitting regions. First, there is a method of changing the power supplied to each light emitting region. In this case, a method of changing the current is simple and preferable. Furthermore, an optical ND filter can be installed in each light emitting area, and the light flux emitted from the light emitting area is obtained by physically changing the filter and electrically changing the transmittance of a polarizing filter or the like. The amount and / or radiant flux may be varied.

Further, it is preferable that the following condition 5 and / or condition 6 are satisfied.
Condition 5:
The wavelength λ _SSL-BM-max that gives the φ _SSL-BM-max in the light spectral distribution φ _SSL (λ)
But,
430 (nm) ≦ λ _SSL-BM-max ≦ 480 (nm)
It is.
Condition 6:
0.1800 ≤ φ _SSL-BG-min / φ _SSL-RM-max ≤ 0.8500

Further, it is preferable that the following conditions I to IV are satisfied from the viewpoint of improving color appearance. Condition I:
The a ^* value and b ^{* in} the CIE 1976 L ^* a ^* b ^* color space of the following 15 types of modified Munsell color charts # 01 to # 15 assuming mathematically illumination by light emitted in the radiation direction ^. Values are a ^* _nSSL and b ^* _nSSL (where n is a natural number from 1 to 15), respectively.
The CIE 1976 L ^{* of the} 15 types of modified Munsell color charts when mathematically assuming illumination with reference light selected according to the correlated color temperature T _SSL (K) of the light emitted in the radial direction ^. a ^* b ^* a ^* values in a color space, b ^* values of each a ^* _nref, b ^* _nref (where n is from 1 natural numbers 15) when the degree of saturation difference [Delta] C _n is -4.00 ≦ [Delta] C _n ≦ 8.00 (n is a natural number from 1 to 15)
Meet.
Condition II:
The average SAT _ave of the saturation difference represented by the following equation (3) satisfies 0.50 ≦ SAT _ave ≦ 4.00.
Condition III:
In addition, assuming that the maximum value of the saturation difference is ΔC _max and the minimum value of the saturation difference is ΔC _min , the difference | ΔC _max −ΔC _min between the maximum value of the saturation difference and the minimum value of the saturation difference | Is 2.00 ≦ | ΔC _max −ΔC _min | ≦ 10.00
Meet.
Here, ΔC _n = {(a ^* _nSSL ) ² + (b ^* _nSSL ) ² } − {(a ^* _nref ) ² + (b ^* _nref ) ² }.
15 types of modified Munsell color chart # 01 7.5 P4 / 10
# 02 10 PB 4/10
# 03 5 PB 4/12
# 04 7.5 B5 / 10
# 05 10 BG 6/8
# 06 2.5 BG 6/10
# 07 2.5 G 6/12
# 08 7.5 GY 7/10
# 09 2.5 GY 8/10
# 10 5 Y 8.5 / 12
# 11 10 YR7 / 12
# 125 YR7 / 12
# 13 10 R 6/12
# 145 R4 / 14
# 15 7.5 RP 4/12
Condition IV:
The hue angle in the CIE 1976 L ^* a ^* b ^* color space of the above-mentioned 15 types of modified Munsell color _chips when the illumination by the light emitted in the radiation direction is mathematically assumed is θ _nSSL (degree) (where n is A natural number from 1 to 15)
The CIE 1976 L ^{* of the} 15 types of modified Munsell color charts when mathematically assuming illumination with reference light selected according to the correlated color temperature T _SSL (K) of the light emitted in the radial direction ^. _Assuming that the hue angle in the a ^* b ^* color space is θ _nref (degrees) (where n is a natural number from 1 to 15), the absolute value | Δh _n | of the hue angle difference is 0.00 degrees ≦ | Δh _n | ≤ 12.50 degrees (n is a natural number from 1 to 15)
Meet.
However, the _{Δh n} = θ nSSL -θ _nref.

Also, as shown in the first and second embodiments, all φ _SSL N (λ) (N is 1 to M)
However, in a preferred embodiment, the light emitting device satisfies the above conditions 1 to 4. In such an embodiment, when the light emitted from the light emitting region is supplied at any ratio, it is natural, lively, highly visible, and comfortable as viewed outdoors. This makes it possible to achieve both the appearance of color, the appearance of an object, and high light source efficiency. When determining whether φ _SSL N (λ) satisfies the above conditions 1 to 4, it is assumed that only φ _SSL N (λ) is emitted from the light emitting device.
On the other hand, as shown in Embodiments 4 and 6, only light emitted from a single light-emitting region is natural, lively, highly visible, and comfortable, as seen outdoors. In some cases, it may not be possible to achieve both high visibility and high light source efficiency. Even in such a case, by appropriately adjusting the ratio of the light emitted from each of the light emitting regions, it may be possible to realize both good color appearance and high light source efficiency. It goes without saying that such a light emitting device also belongs to the scope of the present invention.

One feature of the present invention is that, as shown in, for example, Embodiments 4 and 6, even if "light sources that cannot achieve both good color appearance and high light source efficiency" are combined, "good color Can achieve both high visibility and high light source efficiency. " Further, as shown in Embodiments 3 and 5, when viewed as a single unit, "a light emitting region in which both good color appearance and high light source efficiency cannot be realized" and "good color appearance and a high light source Even in combination with the "light-emitting region capable of achieving both efficiency", the point is that "good color appearance and high light source efficiency can be achieved at the same time".
As described above, in realizing a light emitting device that “can achieve both natural, lively, highly visible, comfortable, color appearance, object appearance, and high light source efficiency as viewed outdoors,” In the case of a combination that includes a light emitting region in which good color appearance and high light source efficiency cannot be achieved at the same time, especially in the case of a combination of "only light emitting regions in which good color appearance and high light source efficiency cannot be realized at the same time" The following are guidelines for implementing the light emitting device of the present invention.

In order to realize the “light emitting device that achieves both good color appearance and high light source efficiency” of the present invention with “combination of only light emitting regions that cannot achieve both good color appearance and high light source efficiency”, All of D _uvSSL shown in Condition 1, A _cg shown in Condition 2, φ _SSL-BG-min / φ _SSL-BM-max shown in Condition 3, and λ _SSL-RM-max shown in Condition 4 An appropriate numerical range must be obtained as a result of the combination. Also, it is preferable that λ _SSL-BM-max shown in Condition 5 and φ _SSL-BG-min / φ _SSL-RM-max shown in Condition 6 be in appropriate numerical ranges as a result of the combination. For this purpose, the following methods are conceivable.

First, D _uv is as follows.
When the distance D _uv from the blackbody radiation locus of the light emitted from each light emitting region is not within an appropriate range, for example, the following (a), (i), and (u) are effective.
(A): A light-emitting device in which light-emitting regions whose chromaticity coordinates on various chromaticity diagrams are far apart is combined.
(I): When the correlated color temperature can be defined, the light emitting device is formed by combining a plurality of light emitting regions that are far apart from each other.
(U): If the distance D _uv from the blackbody radiation locus can be defined, this is a light emitting device that combines a plurality of light emitting regions that are far apart.
This is for the following reason.
For example, the light emitting device has two light emitting regions, the D _{uv of} light emitted from one is larger than an appropriate range (−0.0220 or more and −0.0070 or less), and the D _{uv of} light emitted from the other is When the driving point has a value smaller than the appropriate range (not less than -0.0220 and not more than -0.0070), the driving point combining light from both light sources at a specific ratio can provide good color appearance and high light source efficiency. It is easily understood that the values can be compatible.
However, even if, for example, the light emitting device has two light emitting regions, and the light emitted from either region has a value of D _uv larger than an appropriate range (not less than -0.0220 and not more than -0.0070), Since the blackbody radiation locus is curved on the CIE1976u'v 'chromaticity diagram, the driving point combining light from both light sources at a specific ratio is a value that achieves both good color appearance and high light source efficiency. obtain. For example, in FIG. 67 of Example 6 or Table 21, D _uv of the light emitting area 51 (in other words, D _{uvSSL at the} driving point A) is −0.0064, and D _{uv of the} light emitting area 52 (in other words, D _{uvSSL at the} driving point E _). ) Is -0.0093, and the D _uvSSL of the driving point C, which is this combination, is -0.0112, which is smaller than any of the values. In order to effectively utilize such a tendency, it is preferable to satisfy the above requirements (A), (I), and (U).

Secondly, A _cg is as follows.
If A _cg of light emitted from the light emitting regions are not all proper range, as well as the D _uv, the lower (Oh) (ii) (iii) is effective.
(A): A light-emitting device in which light-emitting regions whose chromaticity coordinates on various chromaticity diagrams are far apart is combined.
(I): When the correlated color temperature can be defined, the light emitting device is formed by combining a plurality of light emitting regions that are far apart from each other.
(U): If the distance D _uv from the blackbody radiation locus can be defined, this is a light emitting device that combines a plurality of light emitting regions that are far apart.
This is for the following reason.
For example, the light emitting device has two light-emitting regions, and A _{cg of} light emitted from one is larger than an appropriate range (greater than −10 and 120 or less), and A _{cg of} light emitted from the other is equal to an appropriate range (−). When the driving point has a value larger than 10 and smaller than 120), the driving point obtained by combining the light from both light sources at a specific ratio can be a numerical value that achieves both good color appearance and high light source efficiency. It is easily understood.
However, for example, even if it has two light emitting regions and the light emitted from either region has a value A _cgv larger than an appropriate range (greater than −10 and less than 120), the reference light spectral distribution Since the change with respect to the color temperature is non-linear, the driving point combining light from both light sources at a specific ratio can be a numerical value that achieves both good color appearance and high light source efficiency. For example, in FIG. 66 or the table 21 from FIG. 62 of Example 6, A _cg of the light emitting region 51 (A _cg at the driving point A and in other words) is 130.4, the A _cg (in other words the driving point E of the light-emitting region 52 yet a _cg) 123.4, the a _cg drive point C is the combination becomes a value smaller than any value between 85.8 is by this reason. In order to effectively utilize such a tendency, it is preferable to satisfy the above requirements (A), (I), and (U).

Third, φ _SSL-BG-min / φ _SSL-BM-max and φ _SSL-BG-min / φ _SSL-RM-max are as follows.
Since these parameters are values obtained by weighting and averaging the characteristics of light emitted from the light-emitting regions constituting the light-emitting device with the radiant flux ratio, for example, light having two light-emitting regions and emitting light from one If the relevant parameter is larger than the appropriate range, the corresponding parameter of light emitted from the other has a value smaller than the appropriate range, and the driving point combining the light from both light sources at a specific ratio is good. It can be a numerical value that achieves both good color appearance and high light source efficiency. For this reason, the following combinations of light sources are effective.
(A '): A light-emitting device in which light-emitting regions that emit light with different uneven positions in the spectral distribution are combined.
For example, FIGS. 48 to 52 or Table 19 of the fourth embodiment correspond to this case.

Fourth, λ _SSL-RM-max and λ _SSL-BM-max are as follows. These indices are given from the spectral radiant flux distribution shape obtained by weighting and averaging the characteristics of light emitted from the light emitting region constituting the light emitting device with the radiant flux ratio, but the values continuously change. In some cases, the shape may change discontinuously depending on the shape. The former is a case where the spectral radiant flux distribution emitted from all the light emitting regions is relatively gentle, and the latter is a case where at least one spectral radiant flux distribution has a steep peak. Therefore, it is preferable that the combination is appropriately selected according to the spectral radiant flux distribution emitted from each light emitting region constituting the light emitting device, and each index is set to an appropriate range.
Regarding the condition (i), the correlated color temperature difference between two light-emitting regions having the most different correlated color temperatures among a plurality of light-emitting regions constituting the light-emitting device is preferably 2000K or more, more preferably 2500K or more. It is more preferable that the temperature is 3000K or more, very preferable is 3500K or more, and most preferable is 4000K or more. Regarding the condition (u), it is preferable that the absolute value of the Duv difference between the two light-emitting regions having the most different correlated color temperatures in a plurality of light-emitting regions constituting the light-emitting device is 0.005 or more, It is more preferably 0.010 or more, very preferably 0.015 or more, and particularly preferably 0.020 or more.

Furthermore, in realizing a light-emitting device that is "natural, lively, highly visible, comfortable, color-visible, and object-visible and light-source-efficient as if viewed outdoors," A combination that includes a natural, lively, highly visible, comfortable, color-visible, light-emitting area that is incompatible with object visibility and high light source efficiency, as seen in Such a light-emitting device of the present invention may be used only in a light-emitting region where natural, lively, high-visibility, comfortable, color appearance, object visibility and high light source efficiency cannot be compatible. Guidance for implementation can also be listed below.
(E): A light-emitting device in which a plurality of light-emitting regions in which colors A _cg are far apart from each other appears.
(O): A light-emitting device in which a plurality of light-emitting regions in which colors with a large difference in saturation degree ΔC _n appear as colors is combined.
(I): A light emitting device in which a plurality of light emitting regions in which the average SAT _ave of the saturation difference is a color that is far apart is seen.
In these (e), (o), and (ka), in particular, the respective ranges disclosed in the present invention and the ranges of the respective parameters that can be realized by the combination of the light-emitting regions should at least partially overlap. It is more preferable to use three or more light emitting regions so as to overlap on a plane on a chromaticity diagram.

  Furthermore, if four or more light-emitting areas are used, even if all light-emitting areas are “natural, lively, highly visible, comfortable, colored, Even in the case of "only the light emitting region where high light source efficiency cannot be achieved", it is relatively easy to adjust all items from (A) (or (A ')) to (K) within the range disclosed by the present invention. Possible and preferred.

Further, in the present invention, it is also a preferable embodiment that at least one of the light-emitting regions is a light-emitting device in which a wiring which can be electrically driven independently of another light-emitting region is provided. It is a more preferable embodiment that the light emitting device is a light emitting device in which the light emitting region is a wiring which can be electrically driven independently of other light emitting regions. It is a preferable embodiment to drive the light emitting device in this manner. In the case of such an embodiment, the control of the power supplied to each light emitting region becomes easy, and it is possible to realize a color appearance according to the user's preference.
In the present invention, a certain light emitting region may be driven so as to be electrically dependent on another light emitting region. For example, when injecting current into two light emitting regions, when increasing the current injected into one light emitting region, the current injected into the other light emitting region is reduced so that the other is electrically connected to the other. It is also possible to be subordinated. Such a circuit is preferable because it can be easily realized by a configuration using, for example, a variable resistor and does not require a plurality of power supplies.

It is also a preferable embodiment that the light emitting device is a light emitting device in which at least one selected from the group consisting of the index A _cg , the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation locus can change. When at least one selected from the group consisting of A _cg , correlated color temperature T _SSL (K), and distance D _uvSSL from the blackbody radiation trajectory changes, the light flux emitted from the light emitting device in the main radiation direction and / or Alternatively, a light-emitting device capable of independently controlling the radiant flux is also a preferable embodiment. It is a preferable embodiment to drive the light emitting device in this manner. In such an embodiment, the parameters that can realize the color appearance are variable, and it is possible to easily realize the color appearance according to the user's preference.

In a preferred embodiment, the maximum distance L formed by any two points on the virtual outer periphery enclosing the whole different light-emitting regions closest to each other is 0.4 mm or more and 200 mm or less. In such an embodiment, the color separation of the light emitted from the plurality of light-emitting regions is less likely to be visually recognized, and a sense of discomfort when viewing the light-emitting device itself can be reduced. In addition, when viewed as illumination light, spatial additive color mixture sufficiently functions, and when illuminating an illumination target, color unevenness in an illuminated area can be reduced, which is preferable.
The maximum distance L formed by any two points on the virtual outer periphery enclosing the entire light emitting region will be described with reference to the drawings.
FIG. 61 shows the package LED 50 used in the sixth embodiment. The light emitting region closest to the light emitting region 51 is the light emitting region 52. Of these, the virtual outer periphery 53 that envelopes both light emitting regions 51 and 52 is the largest virtual outer periphery, and the maximum distance L is between any two points 54 on the outer periphery. That is, the maximum distance L is represented by the distance 55 between the two points, and is preferably in the case of 0.4 mm or more and 200 mm or less.
The same applies to the lighting system 30 (however, details are not shown) used in the second and third embodiments shown in FIG. 41 and the pair of package LEDs 40 used in the fifth embodiment shown in FIG.

  The maximum distance L formed by any two points on the virtual outer periphery enclosing the whole of the different light emitting regions that are closest to each other is preferably 0.4 mm or more, more preferably 2 mm or more, very preferably 5 mm or more, and most preferably 10 mm or more. Very preferred. This is because, as the virtual outer periphery enclosing one light emitting region is larger, it is easier to basically provide a structure capable of emitting a high radiant flux (and / or a high luminous flux). In addition, the maximum distance L between any two points on the virtual outer periphery enclosing the whole of the different light emitting areas closest to each other is preferably 200 mm or less, more preferably 150 mm or less, and more preferably 100 mm or less. Is very preferable, and it is particularly preferable that it is 50 mm or less. These are important and preferable from the viewpoint of suppressing the occurrence of spatial color unevenness in the illuminated area.

On the other hand, according to the driving method of the present invention, when φ _SSL-BG-min / φ _{SSL-BM-max of} the condition 3 and λ _{SSL-RM-max of} the condition 4 are within the proper range, they are within the proper range. Condition 2 A _cg , correlated color temperature T _SSL
(K) and at least one of the distances D _uvSSL from the blackbody radiation trajectory of the condition 1 within the appropriate range.
When one of them is changed, the luminous flux and / or the radiant flux emitted from the light emitting device in the main radiation direction can be unchanged. Such control is preferable because it is possible to easily check the difference in the color appearance due to the shape change of the spectral distribution without depending on the illuminance of the illumination target.

Also, in the driving method of the light emitting device, when _φSSL-BG-min / φSSL _{-BM-max of} the condition 3 and λSSL _{-RM-max of} the condition 4 are in appropriate ranges, the driving method is within the appropriate range. When the index A _{cg of the} condition 2 is reduced in an appropriate range, the driving method for reducing the luminous flux and / or the radiant flux emitted from the light emitting device in the main radiation direction, and the correlated color temperature T _SSL (K) are increased. when obtained by a driving method of increasing the luminous flux and / or radiant flux emitted from the light emitting device in the main radiation direction, when reduced the D _UvSSL conditions 1 within the proper range in the appropriate range, the light emitting device A driving method that reduces the light flux and / or the radiation flux emitted in the main radiation direction from the light source is preferable. Further, at the same time, when the index A _{cg of the} condition 2 which is within the appropriate range is increased, the driving method for increasing the luminous flux and / or the radiant flux emitted from the light emitting device in the main radiation direction, the correlated color temperature T _{When SSL} (K) is reduced, a driving method for reducing the luminous flux and / or radiant flux emitted from the light emitting device in the main radiation direction, and increasing the D _uvSSL of condition 1 within an appropriate range in an appropriate range. This means that a driving method that increases the light flux and / or the radiation flux emitted from the light emitting device in the main radiation direction is preferable.

When D _{uvSSL of} Condition 1, φ _SSL-BG-min / φ _SSL-BM-max of Condition 3, and λ _{SSL-RM-max of} Condition 4 are within proper ranges, index A of Condition 2 within proper ranges _{When CG} is reduced in an appropriate range, it is necessary to use natural, lively, highly visible, comfortable, color appearance, color appearance, object appearance and high light source efficiency compatible light-emitting devices as viewed outdoors. Thus, it is possible to realize a light-emitting device that emphasizes color appearance. According to various visual experiments, when the index A _cg is reduced in this way, the sense of brightness is improved. Therefore, even if the measured luminous flux and / or radiant flux or the illuminance is reduced, the illumination target is good. It is possible to maintain a good color appearance, and this is preferable because the energy consumption of the light emitting device can be further suppressed. Similarly, when the index A _cg is increased in an appropriate range, the light emitting device is focused on more efficiency, so that the measured luminous flux and / or radiant flux or illuminance can be easily increased.
Also, D _{uvSSL of} condition 1, index A _cg of condition 2, φ _SSL-BG-min / φ _{SSL-BM-max of} condition 3,
When λ _{SSL-RM-max of the} condition 4 is within an appropriate range and the correlated color temperature T _SSL (K) is to be increased, the Kluzov is driven by increasing the luminous flux and / or the radiant flux. With the effect, comfortable lighting can be realized. Conversely, when lowering the color temperature, the luminous flux and / or the radiant flux of the light emitting device can be reduced to control the illuminance of the illumination target to be reduced. These are controls taking in the above-mentioned Kruzov effect, and are preferable.
In addition, the index A _{cg of the} condition 2, the φ _SSL-BG-min / φ _{SSL-BM-max of} the condition 3, and the λ _{SSL-RM-max of} the condition 4 are within the appropriate ranges and are within the appropriate ranges. When the D _uvSSL of the condition 1 is reduced within an appropriate range, it is necessary to achieve a natural, lively, highly visible, comfortable, color appearance, an object appearance and a high light source efficiency as viewed outdoors. In a compatible light emitting device, a light emitting device that emphasizes color appearance can be realized. According to various visual experiments, if the distance D _uvSSL from the blackbody radiation trajectory is reduced in an appropriate range in this manner, the sense of brightness is improved, so that even if the measured light flux and / or radiant flux or illuminance is reduced. Even if it is reduced, the illumination object can maintain good color appearance, and this is preferable because energy consumption of the light emitting device can be suppressed. Similarly, when the distance D _uvSSL from the blackbody radiation trajectory is increased in an appropriate range, the light-emitting device emphasizes more efficiency, so that the measured luminous flux and / or radiant flux or illuminance can be easily increased. Is realized.

  In the present invention, control reverse to that described above can be performed, and it goes without saying that the control method can be appropriately selected depending on the illumination target, the illumination environment, the purpose, and the like.

On the other hand, the following invention matters can be derived from the experimental results.
That is, an illumination object preparing step for preparing an object, and M light emitting regions (M is a natural number of 2 or more) are present therein, and at least one light emitting region includes a blue semiconductor light emitting element, a green phosphor, and a red fluorescent light. An illumination step of illuminating an object with light emitted from a light emitting device including a body as a light emitting element, comprising:
In the illumination step, when the light emitted from the light emitting device illuminates the target, the light measured at the position of the target illuminates so as to satisfy the following conditions 1 and conditions I to IV. In some cases, the effects of the present invention can be obtained.
Condition 1:
The distance D _uvSSL from the blackbody radiation locus defined by ANSI C78.377 of the light measured at the position of the object is −0.0220 ≦ D _uvSSL ≦ −0.0070.
Condition I:
The a ^* value in the CIE 1976 L ^* a ^* b ^* color space of the following 15 types of modified Munsell color patches # 01 to # 15 when the illumination by the light measured at the position of the object is mathematically assumed, b ^* Values are a ^* _nSSL and b ^* _nSSL (where n is a natural number from 1 to 15), respectively.
The CIE 1976 L ^{* of the} 15 types of modified Munsell color charts when mathematically assuming illumination by a reference light selected according to the correlated color temperature T _SSL (K) of the light measured at the position of the object ^. The a ^* value and b ^* value in the a ^* b ^* color space are referred to as a ^* _nref and b ^* _nref , respectively, where n is 1
, The saturation difference ΔC _n is −4.00 ≦ ΔC _n ≦ 8.00 (n is a natural number from 1 to 15).
Meet.
Condition II:
The average SAT _ave of the saturation difference represented by the above equation (3) satisfies 0.50 ≦ SAT _ave ≦ 4.00.
Condition III:
Assuming that the maximum value of the saturation difference is ΔC _max and the minimum value of the saturation difference is ΔC _min , the difference | ΔC _max −ΔC _min | between the maximum value of the saturation difference and the minimum value of the saturation difference Is 2.00 ≦ | ΔC _max −ΔC _min | ≦ 10.00
Meet.
Here, ΔC _n = {(a ^* _nSSL ) ² + (b ^* _nSSL ) ² } − {(a ^* _nref ) ² + (b ^* _nref ) ² }.
15 types of modified Munsell color chart # 01 7.5 P4 / 10
# 02 10 PB 4/10
# 03 5 PB 4/12
# 04 7.5 B5 / 10
# 05 10 BG 6/8
# 06 2.5 BG 6/10
# 07 2.5 G 6/12
# 08 7.5 GY 7/10
# 09 2.5 GY 8/10
# 10 5 Y 8.5 / 12
# 11 10 YR7 / 12
# 125 YR7 / 12
# 13 10 R 6/12
# 145 R4 / 14
# 15 7.5 RP 4/12
Condition IV:
The hue angle in the CIE 1976 L ^* a ^* b ^* color space of the above-mentioned 15 types of modified Munsell color _patches when the illumination by the light measured at the position of the object is mathematically assumed is θ _nSSL (degree) (
Where n is a natural number from 1 to 15)
The CIE 1976 L ^{* of the} 15 types of modified Munsell color charts when mathematically assuming illumination by a reference light selected according to the correlated color temperature T _SSL (K) of the light measured at the position of the object ^. The hue angle in the a ^* b ^* color space is θ _nref (degree) (where n is a natural number from 1 to 15)
When the absolute value of the hue angle difference | Delta] h _n | is 0.00 degrees ≦ | Δh _n | ≦ 12.50 ° (n is a natural number of 1 to 15)
Meet.
However, the _{Δh n} = θ nSSL -θ _nref.

Further, the spectral distribution of light emitted from each light emitting element reaching the position of the object is represented by φ _SSL N
(Λ) (N is 1 to M), and the spectral distribution φ _SSL (λ) of the light measured at the position of the object is
In this case, it is preferable that the lighting method is such that all φ _SSL N (λ) can satisfy Condition 1 and Conditions I to IV.

  In addition, it is preferable that the lighting method be such that at least one of the M light emitting regions is electrically driven independently of the other light emitting regions to illuminate the other light emitting regions. It is more preferable that the lighting method be electrically independent driven to illuminate the light emitting region.

Further, it is preferable that the illumination method is such that at least one of the index SAT _ave , the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation locus is changed, and when at least one of the above indexes is changed. In particular, an illumination method for independently controlling the illuminance of the object is preferable, and it is preferable that the illuminance of the object be invariable when at least one of the indices is changed.
To make the illuminance unchanged means that the illuminance does not substantially change, and the change in the illuminance is preferably ± 20% or less, more preferably ± 15% or less, and ± 10%. It is more preferably at most ± 5%, particularly preferably at most ± 5%, most preferably at most ± 3%. In this way, it is possible to easily examine the difference in color appearance resulting from the change in the shape of the spectral distribution without depending on the illuminance of the illumination target, and to determine the optimal spectral distribution according to the illumination environment, the target, the purpose, and the like. Is preferable because it can be relatively easily found.

Further, it is preferable that the illumination method is such that when the index SAT _ave is increased, the illuminance on the target object is reduced. When the index is increased, a more lively appearance can be realized. In such a situation, the sense of brightness generally increases. Therefore, energy consumption can be suppressed by reducing the illuminance. This also means that an illumination method that increases the illuminance on the object when the index SAT _ave is decreased is preferable.
Further, when the correlated color temperature T _SSL (K) is increased, an illumination method for increasing the illuminance on the target object is preferable. By driving to increase the illuminance when increasing the correlated color temperature T _SSL (K), comfortable illumination can be realized by the Kluzoff effect. Conversely, when lowering the color temperature, it is also possible to control to lower the illuminance of the illumination target. These are controls taking in the above-mentioned Kruzov effect, and are preferable.
When the distance D _uvSSL from the blackbody radiation locus is reduced, an illumination method that reduces the illuminance on the target object is preferable. According to various visual experiments, when the distance D _uvSSL from the blackbody radiation locus is reduced in an appropriate range in this way, the sense of brightness is improved. Can be maintained, and this is preferable because energy consumption of the light emitting device can be suppressed. Similarly, if the distance D _uvSSL from the blackbody radiation trajectory is increased in an appropriate range, it is also preferable to increase the illuminance to maintain a good color appearance of the illumination object.

Further, when the maximum distance formed by any two points on the virtual outer periphery enclosing the whole of the different light emitting areas closest to each other is L, and the distance between the light emitting device and the illumination target is H, 5 × L ≦ H ≦ 500x
It is preferable to use an illumination method in which the distance H is set so as to be L.
At this time, the base point of the light emitting device for measuring the distance is the irradiation port of the light emitting device.
Such an illumination method is preferable because, when the light emitting device is observed from the position of the illumination target, color separation as a light source is difficult to visually recognize, and color unevenness is less likely to occur spatially with respect to the illumination target.

  In the maximum distance L formed by any two points on the virtual outer periphery enclosing the whole of the different light-emitting regions that are closest to each other, and the distance H between the light-emitting device and the illumination target, H is preferably 5 × L or more, and 10 × L or more. The above is more preferable, 15 × L or more is very preferable, and 20 × L or more is particularly preferable. These are the light emitted from the different light emitting regions if H is larger in an appropriate range, that is, if the distance is sufficiently larger than the maximum distance L between any two points on the virtual outer periphery enclosing the different light emitting regions. Is preferable for spatially sufficient color mixing. On the other hand, H is preferably 500 × L or less, more preferably 250 × L or less, very preferably 100 × L or less, and particularly preferably 50 × L or less. These are because if H is separated more than necessary, sufficient illuminance cannot be secured for the illumination target, and is important for realizing a favorable illuminance environment with an appropriate range of driving power.

  A preferred embodiment for implementing the light emitting device according to the present embodiment will be described below, but the embodiment for implementing the light emitting device according to the present embodiment is not limited to the one used in the following description.

  The light-emitting device according to this embodiment emits light in the main radiation direction from the light-emitting device, and the radiometric characteristics of the test light serving as the color stimulus applied to the illumination target and the photometric characteristics are within an appropriate range. If there is, there is no restriction on the configuration, material, etc. of the light emitting device.

A light source such as an illumination light source for implementing the light emitting device according to the present embodiment, a lighting fixture including the illumination light source, and a lighting system including the illumination light source and the lighting fixture include a blue semiconductor light emitting element.
When the above-described conditions are satisfied and the effects of the present embodiment are obtained, the illumination light source including the semiconductor light emitting element may be, for example, a plurality of semiconductor light emitting elements of different types of green and red in addition to the blue semiconductor light emitting element. The element may be included in one illumination light source, and may include a blue semiconductor light emitting element in one illumination light source, a green semiconductor light emitting element in a different one illumination light source, and a different one The illumination light source may include a red semiconductor light-emitting element, and these may be provided together with a lens, a reflector, a drive circuit, and the like in the illumination device to be provided to the illumination system. Further, there is a case where there is one illumination light source in one illumination fixture and a single semiconductor light emitting element is included therein, and the single illumination light source and the illumination fixture according to the present embodiment are used as the single illumination light source and the illumination fixture. Although the device cannot be implemented, the light emitted by the lighting system may satisfy the desired properties at the location of the lighting object due to additive color mixing with light from different lighting fixtures present in the lighting system. Alternatively, of the light emitted as the illumination system, light in the main radiation direction may satisfy desired characteristics. In any form, the light as the color stimulus that is finally irradiated on the illumination target, or the light in the main radiation direction among the light emitted from the light emitting device is appropriate for the present embodiment. Conditions should be satisfied.

  The following describes the light emitting device according to the present embodiment after satisfying the above-described appropriate conditions.

The light emitting device according to the present embodiment has a light emitting element (light emitting material) having a peak in a short wavelength region from Λ1 (380 nm) to Λ2 (495 nm), and is intermediate between Λ2 (495 nm) and Λ3 (590 nm). It has another light emitting element (light emitting material) having a peak in a wavelength region, and further has another light emitting element (light emitting material) having a peak in a long wavelength region from Λ3 (590 nm) to 780 nm. preferable. This is because independently setting or controlling the intensity of each light emitting element can easily realize a preferable color appearance.

Therefore, the light emitting device according to this embodiment has at least one type of light emitting element (light emitting material) having an emission peak in each of the three wavelength regions.
When the above-described conditions are satisfied and the effects of the present embodiment are obtained, two types of the three wavelength regions each include one type, and the other region includes a plurality of light-emitting elements (light-emitting materials). One of the three wavelength regions may have one kind, and the other two regions may have a plurality of light emitting elements (light emitting materials). May have a plurality of light emitting elements.

  In the present embodiment, the semiconductor light emitting element and the phosphor can be freely mixed and mounted, but at least the blue light emitting element and two types (green and red) of the phosphor are mounted in one light source. When the above conditions are satisfied and the effects of the present embodiment can be obtained, a blue light emitting element and three types of phosphors (green, red 1, and red 2) may be mounted in one light source. A portion in which one light source mounts a blue light emitting element and two types of phosphors (green and red), and a portion in which a purple light emitting element and three types of phosphors (blue, green and red) are mounted May be included.

  In the light-emitting device according to this embodiment, the light-emitting elements (light-emitting materials) in each of the three wavelength regions form appropriate irregularities in the spectral distribution from the viewpoint of controlling the intensity of the peak portion and the intensity of the valley between the peaks. In light of this, it is preferable that the following light emitting material, phosphor material, and semiconductor light emitting element are included in the light emitting device as light emitting elements.

  First, in the short wavelength region from Λ1 (380 nm) to Λ2 (495 nm) in the three wavelength regions, heat radiation from a hot filament or the like, discharge radiation from a fluorescent tube, a high-pressure sodium lamp, or the like, or laser Light emitted from any light source, such as stimulated emission light from the light source, spontaneous emission light from a semiconductor light emitting element, and spontaneous emission light from a phosphor. Of these, light emission from a semiconductor light emitting element is preferable because of its small size and high energy efficiency.

Specifically, the following can be used.
As the semiconductor light emitting device, a blue light emitting device containing an In (Al) GaN-based material formed on a sapphire substrate or a GaN substrate in an active layer structure is preferable. Further, a blue light-emitting element containing a Zn (Cd) (S) Se-based material formed on a GaAs substrate in an active layer structure is also preferable (preferable peak wavelengths are as described above).

The spectral distribution of the radiant flux exhibited by a light emitting element (light emitting material) such as a semiconductor light emitting element or a phosphor, and its peak wavelength are determined by the ambient temperature, the heat radiation environment of the light emitting device such as a package or a lamp, the injection current, the circuit configuration, Or, depending on the case, it usually changes slightly due to deterioration or the like.
The same can be said for the spectral distribution of the radiant flux exhibited by a light emitting element (light emitting material) such as a semiconductor light emitting element or a phosphor described below, and its peak wavelength.

  The active layer structure may be a multiple quantum well structure in which a quantum well layer and a barrier layer are stacked, or a single or double hetero structure including a relatively thick active layer and a barrier layer (or a clad layer), and may be formed of one pn junction. It may be homozygous.

  When the above conditions are satisfied and the effects of the present embodiment are obtained, a semiconductor laser such as a blue semiconductor laser may be used as the light emitting element.

The semiconductor light emitting element in the short wavelength region used in the light emitting device according to the present embodiment preferably has a relatively wide full width at half maximum of its emission spectrum. From this viewpoint, the full width at half maximum of the blue semiconductor light emitting device used in the short wavelength region is preferably 5 nm or more, more preferably 10 nm or more, very preferably 15 nm or more, and particularly preferably 20 nm or more. However, even when the emission spectrum is much wider, it becomes difficult to control φ _SSL-BG-min / φ _SSL-BM-max , φ _SSL-BG-min / φ _SSL-RM-max, etc., and the spectral distribution φ _This makes it impossible to form unevenness of an appropriate size at an appropriate position of _SSL (λ). Therefore, the full width at half maximum is preferably 45 nm or less, more preferably 40 nm or less, very preferably 35 nm or less, and particularly preferably 30 nm or less.

  The blue semiconductor light-emitting element in the short wavelength region used in the light-emitting device according to the present embodiment is preferably formed on a sapphire substrate or a GaN substrate because it is preferable that an In (Al) GaN-based material be included in the active layer structure. It is preferably a light emitting element.

  Further, it is preferable that the thickness of the substrate is large or that the substrate is completely separated from the blue semiconductor light emitting element. In particular, when a blue semiconductor light emitting device in a short wavelength region is formed on a GaN substrate, the substrate is preferably thick, preferably 100 μm or more, more preferably 200 μm or more so as to promote light extraction from the GaN substrate side wall. , 400 μm or more is very preferable, and 600 μm or more is particularly preferable. On the other hand, the thickness of the substrate is preferably 2 mm or less, more preferably 1.8 mm or less, very preferably 1.6 mm or less, particularly preferably 1.4 mm or less from the viewpoint of convenience in element fabrication.

  On the other hand, when a light-emitting element is formed on a sapphire substrate or the like, it is preferable that the substrate be peeled off by a method such as laser lift-off. This eliminates internal reflection caused by the optical interface between the In (Al) GaN-based epitaxial layer and the sapphire substrate, and can improve the light extraction efficiency. Therefore, it is preferable to manufacture the light-emitting device of this embodiment using such a light-emitting element because the light-source efficiency is improved.

  When the above-described conditions are satisfied and the effects of the present embodiment are obtained, the light emitting device according to the present embodiment may include a phosphor material in a short wavelength region.

In this embodiment, it is preferable that the above-mentioned φ _SSL (λ) has no effective intensity derived from the light emitting element in the range of 380 nm to 405 nm. Here, "no effective intensity from the light emitting element", phi _SSL (lambda) is, even when the in the wavelength lambda _f of the range having an intensity of from emission element of the above conditions Satisfaction refers to the case where this embodiment is effective. More specifically, phi _SSL emitting elements derived intensity phi _SSL in the wavelength range normalized by the maximum spectral intensity of (λ) (λ _f) is, in any wavelength lambda _f of 380nm or 405nm or less, relative intensity , Preferably 10% or less, more preferably 5% or less, very preferably 3% or less, and particularly preferably 1% or less.
Therefore, in this embodiment using a blue light emitting element such as a blue light emitting element (for example, a blue semiconductor laser having an oscillation wavelength of about 445 nm to 485 nm), the intensity derived from the light emitting element in the range of 380 nm to 405 nm is less than the relative intensity. If it is within the range, it may have intensity as noise derived from the light emitting element.

  Next, in the intermediate wavelength region of Λ2 (495 nm) to Λ3 (590 nm) in the three wavelength regions, heat radiation light from a hot filament or the like, discharge radiation light from a fluorescent tube, a high-pressure sodium lamp, or the like, nonlinear optical effect It can include light emitted from any light source, such as stimulated emission light from a laser or the like, including second harmonic generation (SHG) using SHG, spontaneous emission light from a semiconductor light emitting element, and spontaneous emission light from a phosphor. is there. Of these, light emission from a phosphor excited by light is particularly preferable.

When the above-described conditions are satisfied and the effects of the present embodiment can be obtained, light emission from a semiconductor light emitting element, light emission from a semiconductor laser, or an SHG laser may be included. Is high, and therefore preferable.
Examples of the semiconductor light emitting device include a blue-green light emitting device (peak wavelength of about 495 nm to 500 nm) containing an In (Al) GaN-based material on a sapphire substrate or a GaN substrate in an active layer structure, and a green light emitting device (peak wavelength of 500 nm). To 530 nm), a yellow-green light-emitting element (peak wavelength of about 530 nm to 570 nm), a yellow light-emitting element (peak wavelength of about 570 nm to 580 nm), and the like. Further, a yellow-green light-emitting element using GaP on a GaP substrate (having a peak wavelength of about 530 nm to 570 nm), a yellow light-emitting element using GaAsP on a GaP substrate (having a peak wavelength of about 570 nm to 580 nm), and the like can be given. Further, a yellow light emitting element (peak wavelength of about 570 nm to 580 nm) of AlInGaP on a GaAs substrate can be used.

Green Specific examples of the phosphor material, Ce ³⁺ aluminate was activator and yttrium aluminum oxide and activator of Ce ³⁺ in the medium wavelength region used for the light-emitting device according to the present embodiment, There are green phosphors based on Eu ²⁺ activated alkaline earth silicate crystals and Eu ²⁺ activated alkaline earth silicate nitrides. These green phosphors can usually be excited using an ultraviolet to blue semiconductor light emitting device.

Specific examples of the Ce ³⁺ -activated aluminate phosphor include a green phosphor represented by the following general formula (4).
_{Y a (Ce, Tb, Lu} ) b (Ga, Sc) c Al d O e (4)
(In the general formula (4), a, b, c, d, and e are a + b = 3, 0 ≦ b ≦ 0.2, 4.5 ≦ c + d ≦ 5.5, 0.1 ≦ c ≦ 2.6. And 10.8 ≦ e ≦ 13.4. (The Ce ³⁺ -activated aluminate phosphor represented by the general formula (4) is referred to as a G-YAG phosphor.)
In particular, in the case of a G-YAG phosphor, the composition range satisfying the general formula (4) can be appropriately selected. Further, the wavelength λ _PHOS-GM-max and the full width at half maximum W _PHOS-GM-fwhm that give the maximum emission intensity at the time of light excitation of the phosphor alone are preferable in the light emitting device of the present embodiment in the following ranges.
It is preferable that 01 ≦ b ≦ 0.05 and 0.1 ≦ c ≦ 2.6,
It is more preferable that 0.01 ≦ b ≦ 0.05 and 0.3 ≦ c ≦ 2.6,
It is highly preferred that 0.01 ≦ b ≦ 0.05 and 1.0 ≦ c ≦ 2.6.
Also,
It is also preferable that 0.01 ≦ b ≦ 0.03 and 0.1 ≦ c ≦ 2.6,
More preferably, 0.01 ≦ b ≦ 0.03 and 0.3 ≦ c ≦ 2.6,
It is highly preferred that 0.01 ≦ b ≦ 0.03 and 1.0 ≦ c ≦ 2.6.

Specific examples of the Ce ³⁺ -activated yttrium aluminum oxide-based phosphor include a green phosphor represented by the following general formula (5).
Lu _a (Ce, Tb, Y) _b (Ga, Sc) _c Al _d O _e (5)
(In the general formula (5), a, b, c, d, and e are a + b = 3, 0 ≦ b ≦ 0.2, 4.5 ≦ c + d ≦ 5.5, 0 ≦ c ≦ 2.6, and 10.8 ≦ e ≦ 13.4 is satisfied. (The Ce ³⁺ -activated yttrium aluminum oxide-based phosphor represented by the general formula (5) is referred to as a LuAG phosphor.)
In particular, for the LuAG phosphor, the composition range satisfying the general formula (5) can be appropriately selected. Further, the wavelength λ _PHOS-GM-max and the full width at half maximum W _PHOS-GM-fwhm that give the maximum emission intensity during light excitation of the phosphor alone are preferable in the light emitting device of the present embodiment in the following ranges. .
It is preferable that 0.00 ≦ b ≦ 0.13,
It is more preferable that 0.02 ≦ b ≦ 0.13,
It is highly preferable that 0.02 ≦ b ≦ 0.10.

Other examples include green phosphors represented by the following general formulas (6) and (7).
M ¹ _a M ² _b M ³ _{c Od} (6)
(In the general formula (6), M ¹ represents a divalent metal element, M ² represents a trivalent metal element, M ³ represents a tetravalent metal element, and a, b, c, and d each represent 2.7. ≤ a ≤ 3.3, 1.8 ≤ b ≤ 2.2, 2.7 ≤ c ≤ 3.3, 11.0 ≤ d ≤ 13.0) (represented by the general formula (6)) The phosphor is called a CSMS phosphor.)

In the above formula (6), M ¹ is a divalent metal element, but Mg, Ca, Zn, S
It is preferably at least one selected from the group consisting of r, Cd, and Ba, more preferably Mg, Ca, or Zn, and particularly preferably Ca. In this case, Ca may be a single system or a composite system with Mg. Further, M ¹ may include another divalent metal element.
M ² is a trivalent metal element, and Al, Sc, Ga, Y, In, La, Gd, and Lu
It is preferably at least one selected from the group consisting of Al, Sc, Y, and Lu, more preferably Sc, and particularly preferably Sc. In this case, Sc may be a single system or a complex system with Y or Lu. In addition, M ² must contain Ce, and M ²
It may contain a valent metal element.
M ³ is a tetravalent metal element, and preferably contains at least Si. 4 other than Si
As a specific example of the valent metal element M ³ , at least one selected from the group consisting of Ti, Ge, Zr, Sn, and Hf is preferable, and from the group consisting of Ti, Zr, Sn, and Hf, It is more preferably at least one selected from the group, and particularly preferably Sn. In particular, M ³ is preferably Si. Further, M ³ may include another tetravalent metal element.

In particular, in the case of a CSMS phosphor, the composition range satisfying the general formula (6) can be appropriately selected. Furthermore, in order for the wavelength λ _PHOS-GM-max and the full width at half maximum W _PHOS-GM-fwhm that give the maximum emission intensity at the time of photoexcitation of the phosphor alone to fall within the preferable ranges in the light emitting device of this embodiment, M it is preferred that the lower limit of the percentage of total M ² of Ce contained in ² is 0.01 or more, more preferably 0.02 or more. The upper limit of the percentage of total M ² of Ce contained in M ² is preferably 0.10 or less, more preferably 0.06 or less. Furthermore, the lower limit of the ratio of Mg contained in the M ¹ element to the entire M ¹ is preferably 0.01 or more, and more preferably 0.03 or more. On the other hand, the upper limit is preferably 0.30 or less, and more preferably 0.10 or less.

Further, there is a phosphor represented by the following general formula (7).
M ¹ _a M ² _b M ³ _{c Od} (7)
(In the general formula (7), M ¹ is an activator element containing at least Ce, M ² is a divalent metal element, M ³ is a trivalent metal element, and a, b, c, and d are: 0.0001 ≦ a ≦
0.2, 0.8 ≦ b ≦ 1.2, 1.6 ≦ c ≦ 2.4, and 3.2 ≦ d ≦ 4.8. (The phosphor represented by the general formula (7) is called a CSO phosphor.)

In the above formula (7), M ¹ is an activator element contained in the crystal matrix and contains at least Ce. Further, at least one of 2 to 4 selected from the group consisting of Cr, Mn, Fe, Co, Ni, Cu, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb A valence element can be contained.
M ² is a divalent metal element, and is preferably at least one selected from the group consisting of Mg, Ca, Zn, Sr, Cd, and Ba, and is Mg, Ca, or Sr. Is more preferable, and it is particularly preferable that 50 mol% or more of the element of M ² is Ca.
M ³ is a trivalent metal element, and is preferably at least one selected from the group consisting of Al, Sc, Ga, Y, In, La, Gd, Yb, and Lu, and Al, Sc, Yb, or more preferably in the range of Lu, Sc, or Sc and Al, or more preferably more that is Sc and Lu, and particularly preferably 50 mol% or more of the elements of M ³ is Sc.
M ² and M ³ each represent a divalent and trivalent metal element, but a small part of M2 and / or M3 may be a monovalent, tetravalent or pentavalent metal element. Further, a trace amount of anions, for example, a halogen element (F, Cl, Br, I), nitrogen, sulfur, selenium and the like may be contained in the compound.

In particular, in the case of a CSO phosphor, the composition range satisfying the general formula (7) can be appropriately selected. Further, the wavelength λ _PHOS-GM-max and the full width at half maximum W _PHOS-GM-fwhm that give the maximum emission intensity during light excitation of the phosphor alone are preferable in the light emitting device of the present embodiment in the following ranges. .
It is preferable that 0.005 ≦ a ≦ 0.200,
It is more preferable that 0.005 ≦ a ≦ 0.012,
It is highly preferable that 0.007 ≦ a ≦ 0.012.

Further, a specific example of a phosphor having a Eu ²⁺ -activated alkaline earth silicate crystal as a base includes a green phosphor represented by the following general formula (8).
_{(Ba a Ca b Sr c Mg} d Eu x) SiO 4 (8)
(In the general formula (8), a, b, c, d, and x are a + b + c + d + x = 2, 1.0
≤ a ≤ 2.0, 0 ≤ b <0.2, 0.2 ≤ c ≤ 1, 0, 0 ≤ d <0.2, and 0 <x ≤ 0.5. (The alkaline earth silicate phosphor represented by the general formula (8) is referred to as a BSS phosphor.)
In the BSS phosphor, the composition range satisfying the general formula (8) can be appropriately selected. Further, the wavelength λ _PHOS-GM-max and the full width at half maximum W _PHOS-GM-fwhm that give the maximum emission intensity during light excitation of the phosphor alone are preferable in the light emitting device of the present embodiment in the following ranges. . It is more preferable that 0.20 ≦ c ≦ 1.00 and 0.25 <x ≦ 0.50,
It is highly preferred that 0.20 ≦ c ≦ 1.00 and 0.25 <x ≦ 0.30.
further,
It is preferable that 0.50 ≦ c ≦ 1.00 and 0.00 <x ≦ 0.50,
It is more preferable that 0.50 ≦ c ≦ 1.00 and 0.25 <x ≦ 0.50,
It is highly preferred that 0.50 ≦ c ≦ 1.00 and 0.25 <x ≦ 0.30.

Further, a specific example of a phosphor having Eu ²⁺ -activated alkaline earth silicate nitride as a base includes a green phosphor represented by the following general formula (9).
(Ba, Ca, Sr, Mg, Zn, Eu) ₃ Si ₆ O ₁₂ N ₂ (9)
(This is called BSON phosphor).
In the BSON phosphor, the composition range satisfying the general formula (9) can be appropriately selected. Further, the wavelength λ _PHOS-GM-max and the full width at half maximum W _PHOS-GM-fwhm that give the maximum emission intensity during light excitation of the phosphor alone are preferable in the light emitting device of the present embodiment in the following ranges. .
Divalent metal elements (Ba, Ca, Sr, Mg, Zn, Eu) selectable in the general formula (9)
) Is preferably a combination of Ba, Sr and Eu, and more preferably the ratio of Sr to Ba is 10 to 30%.

In addition, when the above-described conditions are satisfied and the effects of the present embodiment are obtained, (Y ₁ -u _Gdu ) ₃ (Al _{1 -v} G _av ) ₅ O ₁₂ : Ce, Eu (however, u and v satisfy 0 ≦ u ≦ 0.3 and 0 ≦ v ≦ 0.5, respectively.) Yttrium-aluminum-garnet-based phosphor (referred to as YAG phosphor) and Ca _Includes a yellow phosphor such as a lanthanum silicon nitride phosphor represented by _1.5x La _3-x Si ₆ N ₁₁ : Ce (where x is 0 ≦ x ≦ 1) (this is called an LSN phosphor). May be. In addition, a narrow band green phosphor represented by Si _6-z Al _z O _z N _8-z : Eu (where 0 <z <4.2) having a Eu ²⁺ activated sialon crystal as a matrix, or β-SiAlON phosphor). However, as described above, when the light emitting device is configured using only the narrow band green phosphor and the yellow phosphor as light emitting elements in the intermediate wavelength region, it becomes difficult to realize a desired color appearance of the illumination target. Therefore, in the light emitting device of this embodiment, it is possible to use a yellow phosphor, a narrow band green phosphor, or the like in combination with another semiconductor light emitting element, a broad band phosphor, or the like, but it is not always preferable. It is preferable to use a broadband green phosphor as the light emitting element in the intermediate wavelength region.

  Therefore, it is preferable that the light emitting device according to the present embodiment does not substantially include the yellow phosphor. Here, “substantially does not include a yellow phosphor” refers to a case where the above-described conditions are satisfied and the effects of the present embodiment can be obtained even when the yellow phosphor is included. The weight of the yellow phosphor relative to the total weight is preferably 7% or less, more preferably 5% or less, very preferably 3% or less, and particularly preferably 1% or less.

  Next, in the long wavelength region of Λ3 (590 nm) to 780 nm in the three wavelength regions, heat radiation from a hot filament or the like, discharge radiation from a fluorescent tube, a high-pressure sodium lamp, or the like, stimulated emission from a laser or the like. Light emitted from any light source such as light, spontaneous emission light from a semiconductor light emitting element, and spontaneous emission light from a phosphor can be included. Of these, light emission from a phosphor excited by light is particularly preferable.

When the above-described conditions are satisfied and the effects of the present embodiment can be obtained, light emission from a semiconductor light emitting element, light emission from a semiconductor laser, or an SHG laser may be included. Is high, and therefore preferable.
Examples of the semiconductor light emitting device include an orange light emitting device having an active layer structure including an AlGaAs-based material formed on a GaAs substrate and an (Al) InGaP-based material formed on a GaAs substrate (having a peak wavelength of about 590 nm to 600 nm); A red light-emitting element (600 nm to 780 nm) and the like can be given. Further, a red light-emitting element (600 nm to 780 nm) containing a GaAsP-based material formed on a GaP substrate in an active layer structure can be given.

Specific examples of the phosphor material in the long wavelength region used for the light emitting device according to the present embodiment include Eu ²⁺ as an activator and a crystal made of an alkaline earth silicon nitride, α sialon, or an alkaline earth silicate. As a base. This type of red phosphor can usually be excited using an ultraviolet to blue semiconductor light emitting device.

Specific examples of those having an alkaline earth silicon nitride crystal as a matrix include CaAlSiN ₃ : Eu.
(CaSr, Ba, Mg) AlSiN ₃ : Eu and / or (Ca, Sr, Ba) AlSiN ₃ : Eu This is called a SCASN phosphor), a phosphor represented by (CaAlSiN ₃ ) _1-x (Si ₂ N ₂ O) _x : Eu (where x is 0 <x <0.5) (this is referred to as CASON fluorescence). ), (Sr, Ca, Ba) ₂ Al _x Si _5-x O _x N _8-x : a phosphor represented by Eu (0 ≦ x ≦ 2), Eu _y (Sr, Ca, Ba) ₁ ) _-y : a phosphor represented by Al _{1 + x} Si _4-x O _x N _7-x (where 0 ≦ x <4, 0 ≦ y <0.2).

Other examples include Mn ⁴⁺ activated fluoride complex phosphors. The Mn ⁴⁺ activated fluoride complex phosphor is a phosphor using Mn ⁴⁺ as an activator and a fluoride complex salt of an alkali metal, an amine or an alkaline earth metal as a host crystal. In the fluoride complex forming the host crystal, the coordination center is a trivalent metal (B, Al, Ga, In, Y, Sc, lanthanoid) and a tetravalent metal (Si, Ge, Sn, Ti, Zr, Re, Hf) and pentavalent metals (V, P, Nb, Ta), and the number of fluorine atoms coordinated therearound is 5-7.

Specifically, Mn ⁴⁺ -activated fluoride complex _{phosphor, A 2 + x M y Mn} z F n (A is Na and / or K to the alkali metal hexafluoro complex salt as a host crystal; the M Si and Al; −1 ≦ x ≦ 1 and 0.9 ≦ y + z ≦ 1.1 and 0.001 ≦ z ≦ 0.4 and 5 ≦ n ≦ 7). Among them, A is one or more selected from K (potassium) or Na (sodium), and M is Si (silicon) or Ti (titanium), for example, K ₂ S
iF ₆ : Mn (this is referred to as a KSF phosphor), K ₂ Si _1-x Na _x Al _x F ₆ : Mn in which a part (preferably 10 mol% or less) of this constituent element is substituted by Al and Na K ₂ TiF ₆ : Mn (
This is referred to as a KSNAF phosphor).

Other examples include a phosphor represented by the following general formula (10) and a phosphor represented by the following general formula (11).
_{(La 1-xy, Eu x} , Ln y) 2 O 2 S (10)
(In the general formula (10), x and y each represent a number satisfying 0.02 ≦ x ≦ 0.50 and 0 ≦ y ≦ 0.50, and Ln represents Y, Gd, Lu, Sc, Sm and Er. It represents at least one kind of trivalent rare earth element. (The lanthanum oxysulfide phosphor represented by the general formula (10) is called an LOS phosphor.)
(K-x) MgO · xAF 2 · GeO 2: yMn 4+ (11)
(In the general formula (11), k, x, and y represent numbers satisfying 2.8 ≦ k ≦ 5, 0.1 ≦ x ≦ 0.7, and 0.005 ≦ y ≦ 0.015, respectively. A is calcium (Ca), strontium (Sr), barium (Ba), zinc (Zn), or a mixture thereof. (The germanate phosphor represented by the general formula (11) is referred to as an MGOF phosphor. Call.)

In the present embodiment, a configuration in which only one of the CASN phosphor, the CASON phosphor, and the SCASN phosphor is included in the light emitting device is preferable from the viewpoint of improving the light source efficiency.
On the other hand, KSF phosphors, KSNAF phosphors, LOS phosphors, and MGOF phosphors have extremely narrow half-value widths of about 6 nm, about 6 nm, about 4 nm, and about 16 nm, respectively. It is preferable to use in combination with a phosphor, CASON phosphor, SCASN phosphor, or the like, because irregularities can be formed in an appropriate range for the spectral distribution φ _SSL (λ) of the light emitting device.

  The combination of these light-emitting elements is very convenient for realizing the appearance of a color and an object whose peak wavelength position, full width at half maximum, and the like of each light-emitting element are preferred by a subject in a visual experiment.

In the light-emitting device according to the present embodiment, using the light-emitting elements (light-emitting materials) described above, the index A _cg , the distance D _uvSSL , the value φ _SSL-BG-min / φ _SSL-BM-max , and the wavelength λ _{SSL This is} preferable because _{-RM-max and the} like can be easily set to desired values. Further, regarding the light as a color stimulus, the difference between the color appearance of the fifteen color chips when assuming illumination by the light emitting device and the color appearance when assuming illumination with the reference light for calculation is used. ΔC _n , SAT _ave , | ΔC _max −ΔC _min | and | Δh _n | are also preferable because the above-described light-emitting elements can be easily set to desired values.

  The light-emitting device of the present invention has a very wide application field and can be used without being limited to a specific application. However, in light of the features of the light emitting device of the present invention, application to the following fields is preferable.

For example, when illuminated by the light emitting device of the present invention, the white color is whiter, natural, and comfortable even with almost the same CCT and almost the same illuminance as compared with a light emitting device widely known in the past. appear. Further, the lightness difference between achromatic colors such as white, gray, and black can be easily recognized.
For this reason, for example, black characters on general white paper can be easily read. It is preferable to apply such features to work lighting such as reading lights, study desk lighting, and office lighting. Furthermore, depending on the content of the work, inspect the appearance of small parts in factories, etc., identify the colors that are close to each other on fabric, etc., perform the color check to check the freshness of raw meat, product inspection against the limit sample And so on. In addition, when lighting is performed using the light emitting device of the present invention, it is easy to distinguish colors in close hues, and a comfortable working environment such as a high illuminance environment can be realized. Therefore, it is preferable to adapt to work lighting from such a viewpoint.
Furthermore, when compared with the light emitting devices disclosed in Japanese Patent No. 5252107 and Japanese Patent No. 5257538, when illuminated by the light emitting device of the present invention, the light source efficiency of the light emitting device is high and the light is emitted even when the same power is applied. The luminous flux increases. For this reason, it is preferable to use a light emitting device that illuminates an object to be illuminated from a ceiling surface higher than a normal height, and the applicable range of the light emitting device is further widened.

  Further, it is also preferable to apply the present invention to medical lighting such as a light source used in a surgical operation light source or a gastroscope, for example, because the color discrimination ability is improved. This is because arterial blood is bright red because it contains a lot of oxygen, while venous blood is dark red because it contains a lot of carbon dioxide. Although both colors are the same red, but their saturations are different, it is expected that arterial blood and venous blood can be easily distinguished by the light emitting device of the present invention that realizes good color appearance (saturation). In color image information such as an endoscope, it is clear that displaying good colors has a great effect on diagnosis, and it is expected that a normal part and a lesioned part can be easily distinguished. For the same reason, it can also be suitably used as an illumination method in industrial equipment such as a product image judging device.

  When illuminated by the light emitting device of the present invention, even if the illuminance is about several thousand Lx to several hundred Lx, purple, bluish purple, blue, blue green, green, yellow green, yellow, yellow red, red, For most colors, such as magenta, and in some cases, all colors, a truly natural color appearance as seen under tens of thousands of lx, such as under outdoor illuminance on a sunny day, is realized. In addition, the skin color of the subject (Japanese), various foods, clothing, wood color, and the like having an intermediate color saturation also have a natural color appearance that many subjects feel more preferable.

Therefore, if the light emitting device of the present invention is applied to general lighting for home use or the like, foods appear fresh and appetizing, newspapers and magazines are easy to see, and visibility of steps and the like is increased. It is thought that it leads to improvement of safety inside. Therefore, it is preferable to apply the light emitting device of the present invention to home lighting. It is also preferable as illumination for exhibits such as clothing, food, cars, bags, shoes, decorations, furniture, and the like, and illumination that can be visually recognized from the surroundings is possible. As described above, especially when compared with the light emitting devices disclosed in Japanese Patent No. 5252107 and Japanese Patent No. 5257538, when illuminated by the light emitting device of the present invention, the light source efficiency of the light emitting device is high and equivalent power is supplied. However, the emitted light flux becomes large. For this reason, it is preferable to use a light emitting device that illuminates an illumination target from a ceiling surface higher than a normal height. From such characteristics, it is particularly preferable to apply the light emitting device of the present invention to illumination for exhibits.
Further, it is also preferable as illumination of articles such as cosmetics in which a subtle difference in color is a decisive factor for purchase. When used as an illumination for exhibits such as white dresses, even the same white color makes it easier to see subtle color differences, such as bluish white and creamy white, so select the color you want. It becomes possible. Furthermore, it is also suitable as lighting for production at wedding halls, theaters, and the like. Pure white dresses and the like appear pure white, and kimonos such as Kabuki and shades can be clearly seen. Further, the skin color is also outstandingly preferable. Even in such lighting, the light emitting device of the present invention having high light source efficiency can be illuminated from a long distance. Therefore, it is particularly preferable to adapt the light emitting device of the present invention to lighting for production.
In addition, when used as a light in a beauty salon, when hair is subjected to color processing, it is possible to make the color have a color that does not conflict with that when viewed outdoors, and it is possible to prevent dyeing too much or insufficiently.

  Furthermore, since white appears more white, achromatic colors can be easily identified, and chromatic colors also have a natural vividness, it can be used in places where many types of activities are performed in a limited space. It is also suitable as a light source. For example, reading, working, and eating are performed in the seats on the aircraft. Further, the situation is similar in a train, a long-distance bus, and the like. The light emitting device of the present invention can be suitably used as such interior lighting for transportation.

  Further, since the white color looks more white, the achromatic color can be easily identified, and the chromatic color also has a natural vividness, it is illuminated with a natural color tone as if a painting in a museum or the like was viewed outdoors. The light emitting device of the present invention can be suitably used as lighting for works of art.

  On the other hand, the light emitting device of the present invention can be suitably used as lighting for the elderly. In other words, even in the case where fine characters are difficult to see under normal illuminance, steps or the like are difficult to see, by applying the light emitting device of the present invention, it is easy to distinguish between achromatic colors or chromatic colors. Therefore, these problems can be solved. Therefore, it can be suitably used for lighting in public facilities and the like used by an unspecified number of people, such as nursing homes, hospital waiting rooms, bookstores and libraries. When making such illumination, it is necessary to increase the illuminance itself in an appropriate range.However, the light emitting device of the present invention having high light source efficiency can reduce the illuminance of the illumination surface even with the same input power. It can be higher. Therefore, it is particularly preferable to adapt the light emitting device of the present invention to illumination for elderly people.

Further, the light emitting device of the present invention can be suitably used in applications in which visibility is ensured by adapting to an illumination environment in which the illuminance tends to be relatively low under various circumstances.
For example, it is also preferable that the present invention is applied to a street light, a headlight of a car, and a foot light, and various kinds of visibility are improved as compared with a case where a conventional light source is used.

100 light emitting device 1, 11, 21, 31, 41, 51 light emitting region 1
2, 12, 22, 32, 42, 52 Light-emitting area 2
3, 23 Light emitting area 3
4 Light emitting area 4
5 Light emitting area 5
6 Packaged LED
43, 53 Virtual circumference 44, 54 Two points 45, 55 on virtual circumference Distance between two points on virtual circumference 10 Package LED
20 Package LED
30 Lighting system 40 A pair of package LED

Claims (24)

A light emitting device including M light emitting regions (M is a natural number of 2 or more) and including a blue semiconductor light emitting element, a green phosphor, and a red phosphor as light emitting elements in at least one of the light emitting regions,
The spectral distribution of light emitted from each light emitting region in the main radiation direction of the light emitting device is represented by φ _SSL N (
λ) (N is 1 to M), and the spectral distribution φ _SSL (λ) of all light emitted from the light emitting device in the radiation direction is:

At the time
A light emitting device having a light emitting region capable of satisfying φ _SSL (λ) so as to satisfy the following conditions I-IV and conditions 1 to 3.
Condition I:
The a ^* value and b ^{* in} the CIE 1976 L ^* a ^* b ^* color space of the following 15 types of modified Munsell color patches # 01 to # 15 assuming mathematically illumination by light emitted in the radiation direction ^. Values are a ^* _nSSL and b ^* _nSSL (where n is a natural number from 1 to 15), respectively.
The CIE 1976 L ^{* of the} 15 types of modified Munsell color charts when mathematically assuming illumination with reference light selected according to the correlated color temperature T _SSL (K) of the light emitted in the radial direction ^{. a *} b ^* a ^* values in a color space, ^{b *} values of each ^{a *} _nref, ^{b *} _nref (where n is from 1 natural numbers 15) when the degree of saturation difference [Delta] C _n is -4.00 ≦ [Delta] C _n ≦ 8.00 (n is a natural number from 1 to 15)
Meet.
Condition II:
The average SAT _ave of the saturation difference represented by the following equation (3) satisfies 0.50 ≦ SAT _ave ≦ 4.00.

Condition III:
Assuming that the maximum value of the saturation difference is ΔC _max and the minimum value of the saturation difference is ΔC _min , the difference | ΔC _max −ΔC _min | between the maximum value of the saturation difference and the minimum value of the saturation difference Is 2.00 ≦ | ΔC _max −ΔC _min | ≦ 10.00
Meet.
Where ΔC _n = √ ｛(a ^* _nSSL ) ² + (b ^* _nSSL ) ² ｝ −√ ｛(a ^* _nref ) ² + (b
^* _Nref ) ² ｝.
15 types of modified Munsell color chart # 01 7.5 P4 / 10
# 02 10 PB 4/10
# 03 5 PB 4/12
# 04 7.5 B5 / 10
# 05 10 BG 6/8
# 06 2.5 BG 6/10
# 07 2.5 G 6/12
# 08 7.5 GY 7/10
# 09 2.5 GY 8/10
# 10 5 Y 8.5 / 12
# 11 10 YR7 / 12
# 125 YR7 / 12
# 13 10 R 6/12
# 145 R4 / 14
# 15 7.5 RP 4/12
Condition IV:
The hue angle in the CIE 1976 L ^* a ^* b ^* color space of the above-described 15 types of modified Munsell color _chips when mathematically assuming illumination by light emitted in the radiation direction is θ _nSSL (degrees) (where n is A natural number from 1 to 15)
The CIE 1976 L ^{* of the} 15 types of modified Munsell color charts when mathematically assuming illumination with reference light selected according to the correlated color temperature T _SSL (K) of the light emitted in the radial direction ^. _Assuming that the hue angle in the a ^* b ^* color space is θ _nref (degrees) (where n is a natural number from 1 to 15), the absolute value | Δh _n | of the hue angle difference is 0.00 degrees ≦ | Δh _n | ≤ 12.50 degrees (n is a natural number from 1 to 15)
Meet.
However, the _{Δh n} = θ nSSL -θ _nref.
Condition 1:
The light emitted from the light emitting device includes, in a main radiation direction, light in which a distance D _uvSSL from a black body radiation locus defined by ANSI C78.377 satisfies −0.0220 ≦ D _uvSSL ≦ −0.0070. .
Condition 2:
The light emitted from the light emitting device in the emission direction is represented by φ _SSL (λ),
Of a criterion selected according to the correlated color temperature T _SSL (K) of light emitted from the device in the radiation direction .
The spectral distribution of light is φ _ref (λ), and the tristimulus values of light emitted from the light emitting device in the emission direction
(X _SSL , Y _SSL , Z _SSL ), the correlated color temperature of light emitted from the light emitting device in the radiation direction.
The reference tristimulus values of light selected according to the degree T _SSL (K) are (X _ref , Y _ref , Z _ref ),
A normalized spectral distribution S _SSL (λ) of light emitted from the light emitting device in the radiation direction ;
It is selected according to the correlated color temperature T _SSL (K) of light emitted from the light emitting device in the radiation direction.
The normalized spectral distribution S _ref (λ) of the reference light and the difference ΔS (λ) between these normalized spectral distributions are
Each,
S _SSL (λ) = φ _SSL (λ) / Y _SSL
S _ref (λ) = φ _ref (λ) / Y _ref
ΔS (λ) = S _ref (λ) −S _SSL (λ)
Is defined as
Gives the maximum value of the longest wavelength of S _SSL (λ) in the wavelength range of 380 nm to 780 nm
When the wavelength is λ _R (nm), when there is a wavelength な る 4 that is S _SSL (λ _R ) / 2 on the longer wavelength side than λ _R ,
The index A _cg represented by the following equation (1) satisfies −10 <A _cg ≦ 120,
Gives the maximum value of the longest wavelength of S _SSL (λ) in the wavelength range of 380 nm to 780 nm
When the wavelength is λ _R (nm), when there is no wavelength Λ4 that is S _SSL (λ _R ) / 2 on the longer wavelength side than λ _R ,
The index A _cg represented by the following equation (2) satisfies −10 <A _cg ≦ 120.


Condition 3:
The spectral distribution φ _SSL (λ) of the light indicates the maximum value of the spectral intensity in the range of 430 nm to 495 nm as φ _SSL-BM-max , and the minimum value of the spectral intensity in the range of 465 nm to 525 nm as φ _SSL-BG- When defined as _min ,
0.2250 ≤ φ _SSL-BG-min / φ _SSL-BM-max ≤ 0.7000
It is. The light emitting device according to claim 1 ,
A light-emitting device having a light-emitting region in which φ _SSL (λ) can satisfy the following condition 4:
Condition 4:
When the maximum value of the spectral intensity in the range of 590 nm or more and 780 nm or less is defined as φ _SSL-RM-max , the wavelength λ _SSL- which gives the φ _SSL-RM-max is defined as the light spectral distribution φ _SSL (λ). _RM-max ,
605 (nm) ≦ λ _SSL-RM-max ≦ 653 (nm)
It is. The light emitting device according to claim 1 , wherein:
A light emitting device in which all φ _SSL N (λ) (where N is 1 to M) satisfy the above conditions I-IV and conditions 1 to 3 . The light emitting device according to any one of claims 1 to 3 , wherein
A light-emitting device in which at least one light-emitting region among the M light-emitting regions is a wiring that can be electrically driven independently of other light-emitting regions. The light emitting device according to claim 4 ,
A light-emitting device in which all M light-emitting regions are wirings that can be electrically driven independently of other light-emitting regions. A light emitting device according to any one of claims 1 to 5
A light emitting device satisfying the following condition 5:
Condition 5:
The wavelength λ _SSL-BM-max that gives the φ _SSL-BM-max in the light spectral distribution φ _SSL (λ)
But,
430 (nm) ≦ λ _SSL-BM-max ≦ 480 (nm)
It is. The light emitting device according to any one of claims 1 to 6 , wherein
A light emitting device satisfying the following condition 6.
Condition 6:
0.1800 ≤ φ _SSL-BG-min / φ _SSL-RM-max ≤ 0.8500 A light emitting device according to any one of claim 1 to 7
A light-emitting device, wherein a radiation efficiency K (lm / W) in a wavelength range from 380 nm to 780 nm derived from φ _SSL (λ) satisfies the following condition 7.
Condition 7:
210.0 lm / W ≦ K ≦ 290.0 lm / W A light emitting device according to any one of claims 1-8,
A light-emitting device in which a maximum distance L formed by any two points on a virtual outer periphery enclosing the whole of different light-emitting regions that are closest to each other is 0.4 mm or more and 200 mm or less. A light emitting device according to any one of claims 1 to 9
The light emitted from the light emitting device in the emission direction has a correlated color temperature T _SSL (K) of 2600 K ≦ T _SSL ≦ 7700 K.
A light emitting device characterized by being able to satisfy the following. The light emitting device according to any one of claims 1 to 10 , wherein
By changing the amount of luminous flux and / or radiant flux emitted from the light-emitting region, a light-emitting region capable of satisfying the conditions I-IV and the conditions 1 to 3 with the φ _SSL (λ) exists. A light emitting device characterized by the above-mentioned. The light emitting device according to any one of claims 1 to 11 , wherein
At least one emission selected from the group consisting of the index A _cg represented by the formula (1) or (2), the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation locus can be changed. apparatus. The light emitting device according to claim 12 ,
When at least one selected from the group consisting of the index A _cg represented by the formula (1) or (2), the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation locus changes. A light emitting device characterized in that a light beam and / or a radiation beam emitted from the light emitting device in a main radiation direction can be controlled independently. An illumination object preparation step of preparing an object, and M (M is a natural number of 2 or more) light-emitting regions, and a blue semiconductor light-emitting element, a green phosphor, and a red phosphor are provided in at least one light-emitting region. An illumination method including an illumination step of illuminating an object with light emitted from a light emitting device provided as a light emitting element,
In the illumination step, when the light emitted from the light emitting device illuminates the object, the illumination is performed so that the light measured at the position of the object satisfies the following conditions I to IV and conditions 1 to 3 Method.
Condition I:
The a ^* value, b in the CIE 1976 L ^* a ^* b ^* color space of the following 15 types of modified Munsell color patches # 01 to # 15 when illumination by light measured at the position of the object is mathematically assumed. ^* Values are a ^* _nSSL and b ^* _nSSL (where n is a natural number from 1 to 15), respectively.
The CIE 1976 L ^{* of the} 15 types of modified Munsell color charts when mathematically assuming illumination by a reference light selected according to the correlated color temperature T _SSL (K) of the light measured at the position of the object ^{. a *} b ^* a ^* values in a color space, ^{b *} values of each ^{a *} _nref, ^{b *} _nref (where n is from 1 natural numbers 15) when the degree of saturation difference [Delta] C _n is -4.00 ≦ [Delta] C _n ≦ 8.00 (n is a natural number from 1 to 15)
Meet.
Condition II:
The average SAT _ave of the saturation difference represented by the following equation (3) satisfies 0.50 ≦ SAT _ave ≦ 4.00.

Condition III:
Assuming that the maximum value of the saturation difference is ΔC _max and the minimum value of the saturation difference is ΔC _min , the difference | ΔC _max −ΔC _min | between the maximum value of the saturation difference and the minimum value of the saturation difference Is 2.00 ≦ | ΔC _max −ΔC _min | ≦ 10.00
Meet.
Where ΔC _n = √ ｛(a ^* _nSSL ) ² + (b ^* _nSSL ) ² ｝ −√ ｛(a ^* _nref ) ² + (b
^* _Nref ) ² ｝.
15 types of modified Munsell color chart # 01 7.5 P4 / 10
# 02 10 PB 4/10
# 03 5 PB 4/12
# 04 7.5 B5 / 10
# 05 10 BG 6/8
# 06 2.5 BG 6/10
# 07 2.5 G 6/12
# 08 7.5 GY 7/10
# 09 2.5 GY 8/10
# 10 5 Y 8.5 / 12
# 11 10 YR7 / 12
# 125 YR7 / 12
# 13 10 R 6/12
# 145 R4 / 14
# 15 7.5 RP 4/12
Condition IV:
The hue angle in the CIE 1976 L ^* a ^* b ^* color space of the above-described 15 types of modified Munsell color _patches when the illumination by the light measured at the position of the object is mathematically assumed is θ _nSSL (degrees) (where n Is a natural number from 1 to 15)
The CIE 1976 L ^{* of the} 15 types of modified Munsell color charts when mathematically assuming illumination by a reference light selected according to the correlated color temperature T _SSL (K) of the light measured at the position of the object ^. _Assuming that the hue angle in the a ^* b ^* color space is θ _nref (degrees) (where n is a natural number from 1 to 15), the absolute value | Δh _n | of the hue angle difference is 0.00 degrees ≦ | Δh _n | ≤ 12.50 degrees (n is a natural number from 1 to 15)
Meet.
However, the _{Δh n} = θ nSSL -θ _nref.
Condition 1:
The distance D _uvSSL from the blackbody radiation locus defined by ANSI C78.377 of the light measured at the position of the object is −0.0220 ≦ D _uvSSL ≦ −0.0070.
Condition 2:
The spectral distribution of light measured at the position of the object is measured at φ _SSL (λ) at the position of the object.
The reference light spectral distribution selected according to the correlated color temperature T _SSL (K) of the reflected light is φ _ref (λ), and the tristimulus values of the light measured at the position of the object are (X _SSL , Y _SSL , Z _SSL ), the position of the object
The tristimulus values of the reference light selected according to the correlated color temperature T _SSL (K) of the light measured at (X _ref , Y _ref , Z _ref )
The normalized spectral distribution S _SSL (λ) of light measured at the position of the object, and
The normalized spectral distribution S _ref (λ) of the reference light selected according to the measured correlated color temperature T _SSL (K) and the difference ΔS (λ) between these normalized spectral distributions are
S _SSL (λ) = φ _SSL (λ) / Y _SSL
S _ref (λ) = φ _ref (λ) / Y _ref
ΔS (λ) = S _ref (λ) −S _SSL (λ)
Is defined as
Gives the maximum value of the longest wavelength of S _SSL (λ) in the wavelength range of 380 nm to 780 nm
When the wavelength is λ _R (nm), when there is a wavelength な る 4 that is S _SSL (λ _R ) / 2 on the longer wavelength side than λ _R ,
The index A _cg represented by the following equation (1) satisfies −10 <A _cg ≦ 120,
Gives the maximum value of the longest wavelength of S _SSL (λ) in the wavelength range of 380 nm to 780 nm
When the wavelength is λ _R (nm), when there is no wavelength Λ4 that is S _SSL (λ _R ) / 2 on the longer wavelength side than λ _R ,
The index A _cg represented by the following equation (2) satisfies −10 <A _cg ≦ 120.


Condition 3:
The spectral distribution of light emitted from each light emitting element reaching the position of the object is represented by φ _SSL N (
λ) (N is 1 to M), and the spectral distribution φ _SSL (λ) of the light measured at the position of the object is

At the time
The spectral distribution φ _SSL (λ) of the light indicates the maximum value of the spectral intensity in the range of 430 nm to 495 nm as φ _SSL-BM-max , and the minimum value of the spectral intensity in the range of 465 nm to 525 nm as φ _SSL-BG- When defined as _min ,
0.2250 ≤ φ _SSL-BG-min / φ _SSL-BM-max ≤ 0.7000
It is. The lighting method according to claim 14 ,
An illumination method capable of satisfying the conditions 1 to 3 and the conditions I to IV for all φ _SSL N (λ) (N is 1 to M). It is a lighting method according to claim 14 or 15 ,
A lighting method in which at least one of the M light-emitting regions is electrically driven independently and illuminated with respect to another light-emitting region. 17. The lighting method according to claim 16 , wherein
A lighting method in which all M light emitting regions are electrically independently driven to illuminate other light emitting regions. The lighting method according to any one of claims 14 to 17 , wherein
Changing at least one selected from the group consisting of the average SAT _ave of the saturation difference represented by the formula (3), the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation locus. A lighting method characterized by the above-mentioned. 19. The lighting method according to claim 18 , wherein
At least one selected from the group consisting of the average SAT _ave of the saturation difference represented by the above formula (3), the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation locus was changed. An illumination method for controlling the illuminance of the object independently. 20. The lighting method according to claim 19 ,
At least one selected from the group consisting of the average SAT _ave of the saturation difference represented by the above formula (3), the correlated color temperature T _SSL (K), and the distance D _uvSSL from the blackbody radiation locus was changed. At this time, an illumination method that makes the illuminance of the object invariable. 20. The lighting method according to claim 19 ,
An illumination method for reducing the illuminance on the target object when the average SAT _ave of the saturation difference represented by the formula (3) is increased. 20. The lighting method according to claim 19 ,
An illumination method for increasing the illuminance on the target object when the correlated color temperature T _SSL (K) is increased. 20. The lighting method according to claim 19 ,
An illumination method for reducing the illuminance on the target object when the distance D _uvSSL from the blackbody radiation locus is reduced. The illumination method according to any one of claims 14 to 23 ,
When the maximum distance created by any two points on the virtual outer periphery enclosing the entire different light emitting area that is closest to each other is L, and the distance between the light emitting device and the illumination target is H,
5 × L ≦ H ≦ 500 × L
An illumination method for setting the distance H such that