WO2018016047A1 - 発光装置 - Google Patents
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- WO2018016047A1 WO2018016047A1 PCT/JP2016/071394 JP2016071394W WO2018016047A1 WO 2018016047 A1 WO2018016047 A1 WO 2018016047A1 JP 2016071394 W JP2016071394 W JP 2016071394W WO 2018016047 A1 WO2018016047 A1 WO 2018016047A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/08—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body
Definitions
- the present invention relates to a light emitting device that excites a phosphor and outputs light.
- a light emitting device using a light emitting element such as a light emitting diode (LED) and a phosphor excited by the light emitting element has been put into practical use.
- a light emitting element such as a light emitting diode (LED) and a phosphor excited by the light emitting element
- a desired chromaticity point relatively along black body radiation is realized by combining the emission spectra of light emitted from the LED and the phosphor.
- light emission from blackbody radiation and sunlight (approximate to blackbody radiation) have a continuous spectrum in nature, whereas general LED white light is discontinuous because it is a combination of spectra. This is a synthetic spectrum. For this reason, the light quality is different even with the same chromaticity as the light emission by blackbody radiation.
- color rendering black body radiation or reflected color by sunlight is most preferable, and there are several evaluation methods using this as an index of 100.
- the most common is the International Commission on Illumination ( There is a CRI index defined by CIE).
- CIE International Commission on Illumination
- the color space deviation is evaluated with respect to 15 types of test colors (R1 to R15) irradiated with reference light (black body radiation or sunlight) corresponding to a desired color temperature.
- the average color rendering index Ra average of R1 to R8
- JP 2011-29497 A Japanese Patent Application No. 2015-1000066
- an object is to provide an apparatus.
- the first blue light emitting element that emits the first outgoing light having the first wavelength as the peak wavelength of the emission spectrum, and the first outgoing light.
- a first light-emitting unit that has a first phosphor layer that emits first excitation light and outputs white light having a first chromaticity obtained by mixing the first emission light and the first excitation light;
- a second light-emitting unit that has a second phosphor layer that emits second excitation light and outputs white light having a second chromaticity obtained by mixing the second emission light and the second excitation light.
- the first chromaticity and the second chromaticity are located symmetrically with respect to the predetermined chromaticity, and the first chromaticity and the second chromaticity are included.
- a light emitting device that outputs a light having a predetermined chromaticity by mixing a white light having a first chromaticity and a white light having a second chromaticity that has a difference from the predetermined chromaticity of 0.04 or less.
- a light-emitting device that outputs white light having a high color rendering index with a predetermined chromaticity in a wide temperature range of 2000K to 10000K.
- surface which shows the example of the color rendering index of the output light which mixed two white lights.
- It is a schematic diagram which shows the structure of the light-emitting device of a comparative example. It is a graph which shows the relationship between color temperature and a color rendering index about the output light of the light-emitting device of a comparative example. It is a graph which shows the emission spectrum of the output light of the light-emitting device of a comparative example. It is xy chromaticity diagram which shows the chromaticity of the output light of the light-emitting device of a comparative example. It is a schematic diagram for demonstrating the method of making a color difference small using a chromaticity vector.
- FIG. 16A is a schematic diagram for explaining rotation of a chromaticity vector
- FIG. 16A shows a case where the rotation angle is 0 degree to 135 degrees
- FIG. 16B is a case where the rotation angle is 180 degrees to 315 degrees.
- Indicates It is a graph which shows the relationship between the difference corresponding to color rendering index R9, and a rotation angle. It is a graph which shows the relationship between the difference corresponding to the color rendering index R12, and a rotation angle.
- the light emitting device includes a first light emitting unit 10 that outputs white light L1 having a first chromaticity C1, and a white light having a second chromaticity C2. And a second light emitting unit 20 that outputs light L2.
- the light emitting device of FIG. 1 mixes the white light L1 of the first light emitting unit 10 and the white light L2 of the second light emitting unit 20, and outputs light having a predetermined chromaticity.
- the 1st light emission unit 10 and the 2nd light emission unit 20 are arrange
- the first chromaticity C1 and the second chromaticity C2 are located symmetrically with respect to a predetermined chromaticity, and the first chromaticity C1 and the second chromaticity C2 And the predetermined chromaticity is 0.04 or less.
- first chromaticity C1 and the second chromaticity C2 are described as chromaticity points, but in actuality, each chromaticity center is manufactured in about four MacAdam steps. They are used in combination so that there are 3 steps.
- the difference between the first chromaticity C1 and the second chromaticity C2 and the predetermined chromaticity is from the predetermined chromaticity to the chromaticity positions of the first chromaticity C1 and the second chromaticity C2.
- the first chromaticity C1 and the second chromaticity C2 are in symmetrical positions with the predetermined chromaticity interposed therebetween, but the lengths from the predetermined position to the first chromaticity C1 and the second chromaticity C2 respectively. Is determined according to the brightness of the white light L1 and the white light L2.
- the first light emitting unit 10 is excited by the first blue light emitting element 11 that emits the first emitted light having the first wavelength as the peak wavelength of the emission spectrum, and the first emitted light. It has the 1st fluorescent substance layer 12 which radiate
- the “peak wavelength” is the wavelength of the peak value of intensity in the emission spectrum.
- the first light emitting unit 10 outputs white light L1 having a first chromaticity C1 in which the first emitted light and the first excitation light are mixed.
- the first phosphor layer 12 is a green phosphor, a red phosphor, or the like with a component or blending ratio set so that the first light emitting unit 10 outputs the white light L1 having the first chromaticity C1. Phosphors are included.
- the second light emitting unit 20 is excited by the second blue light emitting element 21 that emits the second emitted light having the second wavelength as the peak wavelength of the emission spectrum, and the second emitted light. It has the 2nd fluorescent substance layer 22 which radiate
- the second light emitting unit 20 outputs white light L2 having the second chromaticity C2 in which the second emitted light and the second excitation light are mixed.
- the second phosphor layer 22 contains phosphors with components and blending ratios set so that the second light emitting unit 20 outputs the white light L2 having the second chromaticity C2.
- the first phosphor layer 12 and the second phosphor layer 22 have different phosphor components, blending ratios, and the like.
- the first blue light emitting element 11 and the second blue light emitting element 21 have different peak wavelengths of the emission spectrum. Specifically, the second wavelength that is the peak wavelength of the emitted light from the second blue light emitting element 21 is longer than the first wavelength that is the peak wavelength of the emitted light from the first blue light emitting element 11. . As will be described later, the difference between the first wavelength and the second wavelength is preferably 20 nm to 40 nm.
- the first blue light emitting element 11 and the second blue light emitting element 21 are collectively referred to as a “blue light emitting element”.
- the blue light emitting element is, for example, a blue LED.
- the first light emitting unit 10 has a structure in which the first blue light emitting element 11 is disposed on the bottom surface of the concave portion of the first package 13 having the concave portion.
- the concave portion of the first package 13 is filled with the first phosphor layer 12.
- the second light emitting unit 20 has the same configuration as that of the first light emitting unit 10, and the second blue light emitting element 21 is disposed on the bottom surface of the concave portion of the second package 23 having the concave portion, and the concave portion of the second package 23 is provided. Is filled with the second phosphor layer 22.
- a silicon resin containing a phosphor is used for the first phosphor layer 12 and the second phosphor layer 22 .
- the first light emitting unit 10 and the second light emitting unit 20 are collectively referred to as “light emitting unit”.
- the first package 13 and the second package 23 are mounted on the substrate 40.
- Electrical wiring (not shown) is disposed on the substrate 40, and the first blue light emitting element 11 and the second blue light emitting element 21 are connected to the electrical wiring, respectively.
- a voltage is applied through the electric wiring, a driving current flows, and the first blue light emitting element 11 and the second blue light emitting element 21 emit light.
- the wavelength of the peak value of the emission spectrum differs between the first blue light emitting element 11 and the second blue light emitting element 21.
- the demerit of blue LED which is a narrow half-value width is supplemented, and the color rendering index R12 which tends to become low can be made high. That is, according to the light emitting device shown in FIG. 1, the brightness equivalent to that of a general LED lighting apparatus can be realized by excitation with a blue LED.
- the color mixture of white light obtained by using two blue light emitting elements having different peak wavelengths will be described below. It is assumed that the white light obtained using the first blue light emitting element 11 and the phosphor has the emission spectrum shown in FIG. 2, and the color rendering index is the value shown in FIG. The white light obtained by using the second blue light emitting element 21 and the phosphor has the emission spectrum shown in FIG. 4, and the color rendering index is the value shown in FIG.
- the color rendering index shown in FIGS. 3 and 5 includes those of 70 or less.
- the chromaticity of the white light obtained using the first blue light-emitting element 11 and the chromaticity of the white light obtained using the second blue light-emitting element 21 are shown in an xy chromaticity diagram. Are set so as to be symmetrical about the desired target chromaticity.
- FIG. 6 shows an emission spectrum S of white light obtained by mixing two white lights set with chromaticity in this way
- FIG. 7 shows the color rendering index.
- the emission spectrum S is close to the spectrum B of the black body radiation indicating the emission spectrum of the 5000 K reference light defined by the CIE.
- the color rendering index is 90 or more in the entire area.
- the white light of the target chromaticity can be obtained by mixing the two white lights whose chromaticities are set symmetrically with respect to the target chromaticity.
- the overall color rendering index of white light can be increased. This is because the intensity of two blue light emitting elements having different peak wavelengths is controlled as follows.
- the intensity of the mixed white light can be increased over the entire wavelength region of the blue light.
- a blue light emitting element is used alone, it is difficult to increase the intensity over the entire wavelength region of blue light.
- the first blue light emitting element 11 and the second blue light emitting element 21 are arranged on the bottom surface of the concave portion of the same package 30, and the concave portion of the package 30 is filled with the phosphor layer 200.
- the first blue light emitting element 11 and the second blue light emitting element 21 are respectively arranged in different packages, and the concave portions of the respective packages have the same blending ratio as the phosphor components. It can be considered that the phosphor is filled with a phosphor layer. That is, the output light of different fixed chromaticities depending on only the difference in peak wavelength of the blue light emitting element is mixed.
- FIG. 9 shows the average color rendering index Ra and the color rendering evaluation numbers R9 and R12 when targeting the emission spectrum of black body radiation of 3000K to 6000K for the output light of the light emitting device shown in FIG.
- the color rendering index R9 at 3500K is low. This is because, as shown in FIG. 10, the difference in intensity peak value between the first blue light emitting element 11 and the second blue light emitting element 21 is large. 10 is obtained using the light emission spectrum Sa of the output light of the light emitting device shown in FIG. 8, the light emission spectrum Sa1 of the output light obtained using the first blue light emitting element 11, and the second blue light emitting element 21. An emission spectrum Sa2 of the output light is shown. As shown in the xy chromaticity diagram of FIG. 11, the chromaticity C11 of the output light obtained using the first blue light emitting element 11 and the color of the output light obtained using the second blue light emitting element 21. The degree C21 is symmetrical with respect to the target chromaticity C0.
- the output light of the first light emitting unit 10 is obtained so that output light of desired chromaticity can be obtained and all the color rendering indexes of the output light are high.
- the chromaticity of the output light of the second light emitting unit 20 is set. That is, the first chromaticity C1 is set as the chromaticity of the white light L1 output from the first light emitting unit 10 so that the color rendering of the output light is the highest, and the white color output from the second light emitting unit 20 is set.
- the second chromaticity C2 is set as the chromaticity of the light L2.
- the first light emitting unit 10 is formed so that the chromaticity of the white light L1 becomes the first chromaticity C1, and the second light emission so that the chromaticity of the white light L2 becomes the second chromaticity C2.
- a unit 20 is formed. A method for setting the first chromaticity C1 and the second chromaticity C2 will be described below.
- chromaticity C10 of the output light of the first light emitting unit 10
- chromaticity C20 of the output light of the second light emitting unit 20 as an end point
- the chromaticity vector is rotated around a target chromaticity C0 that is intermediate between the chromaticity C10 and the chromaticity C20. Rotating the chromaticity vector in this way is equivalent to changing the spectral shape while maintaining the chromaticity.
- the chromaticity C10 and the color are adjusted so that the color difference corresponding to the distance in the L * a * b * color space between the target chromaticity C0, the chromaticity C10, and the chromaticity C20 becomes small. Determine the position of degree C20.
- ⁇ E ⁇ ( ⁇ L) 2 + ( ⁇ a) 2 + ( ⁇ b) 2 ⁇ 1/2 (2)
- the coordinate D1 is the coordinate (L1, a1, b1)
- the coordinate D2 is the coordinate (L2, a2, b2)
- ⁇ L
- ⁇ a
- ⁇ b
- FIG. 14 shows the spectral distribution of the color rendering index R1 to R15.
- the horizontal axis in FIG. 14 is the wavelength, and the vertical axis is the intensity.
- the color rendering index R9 which is a red component
- the color rendering index R12 which is a blue component
- the color rendering index R9 and the color rendering index R12 are in contrast.
- the characteristics are shown. For this reason, when the chromaticity vector is rotated, the difference ⁇ W, the difference ⁇ U, and the difference ⁇ v, which are elements in the W * U * v * color space of the color difference ⁇ E, for both the color rendering index R9 and the color rendering index R12. Find the condition that is small.
- the color difference ⁇ E depends on the chromaticity difference ⁇ C in the xy chromaticity diagram of the chromaticity C10 and the chromaticity C20 and the target chromaticity C0, and the color temperature set for the output light of the light emitting device.
- a case where the chromaticity difference ⁇ C is 0.015 and the color temperature is 3500K will be described.
- the + x direction of the xy chromaticity diagram is set as the reference direction
- the angle formed by the chromaticity vector traveling direction and the reference direction when the chromaticity vector is rotated counterclockwise from the reference direction is set as the rotation angle ⁇ . . That is, when the direction of the chromaticity vector is the same as the reference direction, the rotation angle ⁇ is 0 degree.
- FIG. 17 shows the relationship between the square values of the difference ⁇ W, the difference ⁇ U, and the difference ⁇ v corresponding to the color rendering index R9 and the rotation angle ⁇ .
- the square value of the difference ⁇ U has a maximum value, but when the rotation angle ⁇ is 135 ° to 180 ° and 315 ° to 360 °, the difference ⁇ W, the difference ⁇ U, and the square of the difference ⁇ v The value is small.
- FIG. 18 shows the relationship between the rotation angle ⁇ and the square values of the difference ⁇ W, difference ⁇ U, and difference ⁇ v corresponding to the color rendering index R12. As shown in FIG. 18, there is a maximum value in the square value of the difference ⁇ U and the square value of the difference ⁇ v, but when the rotation angle ⁇ is 135 degrees to 180 degrees, the difference ⁇ W, the difference ⁇ U, and the difference ⁇ v The square value is small.
- the color difference ⁇ E can be reduced with respect to the color rendering index R9 and the color rendering index R12 when the rotation angle ⁇ is 135 degrees to 180 degrees. That is, in the xy chromaticity diagram, the angle formed by the straight line having the chromaticity C10 as the start point and the chromaticity C20 as the end point and the + x direction of the xy chromaticity diagram is set to 135 degrees to 180 degrees, thereby improving the color rendering. Can do. Accordingly, the chromaticity C10 when the rotation angle ⁇ is between 135 degrees and 180 degrees is set as the first chromaticity C1, and the chromaticity C20 is set as the second chromaticity C2.
- FIG. 19 shows the relationship between the average color rendering index Ra and the color rendering index R9, R10, R11, R12 and the rotation angle ⁇ at 5000K.
- CNT is the case where the chromaticity C10 and the chromaticity C20 are the same as the target chromaticity C0, that is, the chromaticity difference ⁇ C is zero (the same applies hereinafter).
- high color rendering is obtained when the rotation angle ⁇ is 315 ° to 360 ° (0 °), 135 °, and CNT. In the following, the case of a wide range of 315 ° to 360 ° will be considered as an example. If the target chromaticity changes, the rotation angle ⁇ at which high color rendering properties can be obtained also changes.
- FIG. 20 shows the relationship between the average color rendering index Ra and the color rendering index R9, R10, R11, R12 and the chromaticity difference ⁇ C when the rotation angle ⁇ is 315 degrees.
- high color rendering is obtained when the chromaticity difference ⁇ C is in the range of 0.03 to 0.04.
- the chromaticity difference ⁇ C is larger than 0.04, the color rendering property is lowered, and the color rendering evaluation number varies.
- the color rendering index R12 is greatly reduced. Therefore, in order to reduce the color difference ⁇ E, the chromaticity difference ⁇ C is preferably 0.04 or less.
- the adjustment of the chromaticity difference ⁇ C is equivalent to the adjustment of the peak height of the emission spectrum in the output light of the light emitting unit. That is, the optimum value for obtaining high color rendering properties varies depending on the ratio of the light output of the light emitting unit.
- P2 / P1 which is the ratio of the light output P2 of the second light emitting unit 20 to the light output P1 of the first light emitting unit 10
- the light output ratio the average color rendering index Ra
- the relationship between the evaluation numbers R9, R10, R11, and R12 will be described.
- FIG. 21 shows the average color rendering index Ra and the light output ratio in the case of CNT and when the chromaticity difference ⁇ C is 0.007, 0.015, 0.03, 0.04, and 0.06, respectively. Shows the relationship.
- the reference value Ta for high color rendering properties is shown as 95. As shown in FIG. 21, the color rendering index exceeds the reference value Ta when the light output ratio is> 0.8 when the chromaticity difference ⁇ C is 0.015, 0.03, and 0.06.
- FIGS. 22 to 25 show the relationship between the color rendering index and the light output ratio with respect to the color rendering index R9, R10, R11, and R12. 22 to 25, the color rendering index and the light output ratio in the case of CNT and the case where the chromaticity difference ⁇ C is 0.007, 0.015, 0.03, 0.04, and 0.06, respectively. Shows the relationship.
- the reference value Tj for high color rendering properties is shown as 90.
- the color rendering index R9 exceeds the reference value Tj when the light output ratio is> 0.8.
- the chromaticity difference ⁇ C is 0.007,. This is the case for 015 and 0.03.
- the chromaticity difference ⁇ C is 0.007, 0.015,. This is the case of 03, 0.04, and 0.06.
- the color rendering evaluation number exceeds the reference value Tj at the light output ratio> 0.8 at all chromaticity differences ⁇ C as in the case of CNT. .
- the chromaticity difference ⁇ C is 0.015 because the light output ratio> 0.8 satisfies the high color rendering standard. And 0.03. If the target chromaticity changes, the range of the optimum value of the chromaticity difference ⁇ C changes.
- the present inventors have found that the color difference ⁇ E can be reduced when the chromaticity difference ⁇ C is 0.04 or less. Therefore, in order to achieve high color rendering, it is preferable to set the chromaticity difference ⁇ C of the light emitting device to 0.04 or less. In particular, when the chromaticity difference ⁇ C is 0.01 or more, the color rendering can be improved. Accordingly, it is more preferable that the chromaticity difference ⁇ C is 0.01 or more and 0.04 or less. As described above, the case where the chromaticity C10 and the chromaticity C20 are positioned symmetrically with respect to the target chromaticity C0 is more advantageous than the case of the CNT in terms of enhancing the color rendering.
- the light output ratio> 0.8 was used as a reference in consideration of the wavelength balance and target chromaticity in the emission spectrum of the output light of the light emitting device.
- the optimum value of the rotation angle ⁇ is different, but it is predicted that the same result as in the above examination will be obtained.
- P1 ⁇ P2 it does not actually exist.
- the peak wavelength of the blue light-emitting element, the phosphor layer components and the mixing ratio are adjusted. Accordingly, the first light emitting unit 10 is formed so that the chromaticity of the white light L1 is the first chromaticity C1, and the second luminescence is set so that the chromaticity of the white light L2 is the second chromaticity C2.
- a light emitting unit 20 is formed.
- FIG. 26 shows the light emitting device of the comparative example shown in FIG. 8, Example 1 in which the rotation angle ⁇ is 135 degrees in the light emitting device shown in FIG. 1, and Example 2 in which the rotation angle ⁇ is 180 degrees.
- Example 1 and Example 2 all the color rendering evaluation numbers are high.
- the color rendering index R9 is less than 90 in the comparative example, but exceeds 90 in Example 1 and Example 2.
- the color rendering evaluation number can be increased.
- the difference ⁇ U or the difference appear in the dependence of ⁇ v on the rotation angle ⁇ .
- the inventors have found that the maximum value and the minimum value of the difference are obtained when the difference in peak wavelength between the first blue light emitting element 11 and the second blue light emitting element 21 is 20 nm to 40 nm. Found to decrease. Therefore, in order to reduce the color difference ⁇ E, it is preferable that the peak wavelength difference of the blue light emitting element is 20 nm to 40 nm.
- the peak wavelength of the first blue light emitting element 11 is included in the wavelength range of 435 nm to 445 nm and the peak wavelength of the second blue light emitting element 21 is included in the wavelength range of 455 nm to 470 nm, It was confirmed that the color difference ⁇ E can be reduced. In order to enhance the color rendering properties of the output light of the light emitting device, it is preferable that the peak of the first blue light emitting element 11 and the peak of the second blue light emitting element 21 are completely separated.
- the output light of the 1st light emission unit 10 and the 2nd light emission unit 20 is an emission spectrum with few unevenness
- the kind of phosphor contained in the blue light emitting element or the phosphor layer is appropriately selected.
- preferable examples of the phosphors included in the first phosphor layer 12 and the second phosphor layer 22 will be described.
- the first phosphor layer 12 includes a green phosphor that emits green light when excited by the light emitted from the first blue light emitting element 11, and a red phosphor that emits red light. Then, the components and the mixing ratio of the green phosphor and the red phosphor in the first phosphor layer 12 are set so that the white light L1 having the first chromaticity C1 is output from the first light emitting unit 10.
- the second phosphor layer 22 includes a green phosphor that emits green light when excited by the light emitted from the second blue light emitting element 21 and a red phosphor that emits red light. Then, the components and blending ratios of the green phosphor and the red phosphor in the second phosphor layer 22 are set so that the second light emitting unit 20 outputs the white light L2 having the second chromaticity C2.
- a phosphor that emits green light having an emission spectrum having a first wavelength indicating a first intensity and a second wavelength indicating a second intensity smaller than the first intensity is used as the green phosphor.
- a green phosphor that emits green light having an emission spectrum Gs as shown in FIG. 27 is used in the light emitting device.
- the first wavelength ⁇ g1 indicating the first intensity is on the shorter wavelength side than the second wavelength ⁇ g2 indicating the second intensity smaller than the first intensity. That is, the emission spectrum of the green excitation light emitted from the green phosphor has the first peak value at the first wavelength ⁇ g1 and the second wavelength ⁇ g2 longer than the first wavelength ⁇ g1. It has a second peak value that is smaller than the first peak value.
- a phosphor that emits red light having an absorption spectrum with less absorption at the second wavelength ⁇ g2 than the first wavelength ⁇ g1 with respect to green light is used as the red phosphor.
- An example of the emission spectrum Rs of the red excitation light emitted from the red phosphor is shown in FIG.
- FIG. 29 shows an emission spectrum Bs obtained by superimposing the emission spectra of the first blue light emitting element 11 and the second blue light emitting element 21.
- the wavelength ⁇ b1 is the peak wavelength of the first blue light emitting element 11
- the wavelength ⁇ b2 is the peak wavelength of the second blue light emitting element 21.
- the light emitting unit outputs output light in which blue light emitted from the blue light emitting element, green light emitted from the green phosphor, and red light emitted from the red phosphor are mixed.
- FIG. 30 shows the emission spectrum Ls of the output light obtained by mixing the green light, red light, and blue light, the emission spectra of which are shown in FIGS. 27 to 29, respectively.
- the emission spectrum Gs shown in FIG. 27 and the emission spectrum Ls shown in FIG. 30 have different intensities in the wavelength band of green light. That is, in FIG. 27, the intensity at the first wavelength ⁇ g1 is greater than the intensity at the second wavelength ⁇ g2, whereas in FIG. 30, the intensity at the first wavelength ⁇ g1 is greater at the second wavelength ⁇ g2. Smaller than. This is because the red phosphor has an absorption spectrum with less absorption at the second wavelength ⁇ g2 than at the first wavelength ⁇ g1 with respect to green light. That is, since the red phosphor consumes more green light at the first wavelength ⁇ g1 than at the second wavelength ⁇ g2, the intensity of the first wavelength ⁇ g1 and the intensity of the second wavelength ⁇ g2 are reversed. As a result, output light having an emission spectrum Ls with a balanced wavelength as shown in FIG.
- an oxide phosphor or the like is used as the green phosphor that emits green light having an emission spectrum Gs as shown in FIG. 27, an oxide phosphor or the like is used.
- the activator is Ce 3+
- a scandate or scandium-based oxide having two peak values in the emission spectrum by transitioning to two ground levels separated in a crystal field is used.
- the first wavelength ⁇ g1 indicating the first peak value is on the shorter wavelength side than the second wavelength ⁇ g2 indicating the second peak value smaller than the first peak value. Green light having an emission spectrum is emitted.
- red phosphor a nitride-based phosphor having a wide band is used.
- red phosphors having an absorption spectrum in which the absorption at the first wavelength ⁇ g1 is larger than the absorption at the second wavelength ⁇ g2 include Eu2 + -activated CaAlSiN 3 : Eu 2+ and (Sr, Ca) AlSiN 3 : An aluminum nitride phosphor such as Eu 2+ can be used.
- the chromaticity of the white light L1 output from the first light emitting unit 10 and the white light L2 output from the second light emitting unit 20 are the same.
- the chromaticity is positioned symmetrically with respect to the target chromaticity, and the difference from the target chromaticity is 0.04 or less.
- the rotation angle ⁇ of the chromaticity vector is set to 135 degrees to 180 degrees, and the first blue light emitting element 11 and the second blue light emitting element 21 are connected.
- the difference in peak wavelength is preferably 20 nm to 40 nm.
- a light emitting device having a plurality of first light emitting units 10 and a plurality of second light emitting units 20 is alternately mounted in a row and covered with a light diffusion type opaque lamp cover, thereby providing extremely high color rendering properties. It can be finished into a lamp.
- the first light emitting unit 10 and the second light emitting unit 20 are arranged in two rows alternately in the vertical direction and the horizontal direction in plan view, and a light diffusion type opaque lamp cover is used.
- a lamp with extremely high color rendering can also be realized by covering.
- a chip-on-board (COB) type light emitting device can be realized by using light emitting units of various shapes in which a plurality of blue light emitting elements are arranged.
- the first light emitting unit 10 having a plurality of first blue light emitting elements 11 is disposed on the substrate so as to surround the second light emitting unit 20 having a plurality of second blue light emitting elements 21.
- the first light emitting unit 10 and the second light emitting unit 20 are arranged concentrically in a plan view. That is, the ring-shaped first light emitting unit 10 is arranged outside the second light emitting unit 20 that is circular in plan view.
- the first light emitting unit 10 in the first light emitting unit 10, a plurality of first blue light emitting elements 11 are covered with a single first phosphor layer 12.
- a plurality of second blue light emitting elements 21 are covered with a single second phosphor layer 22.
- the first light-emitting unit 10 and the second light-emitting unit 20 are formed by disposing the first blue light-emitting element 11 and the second blue light-emitting element 21 at predetermined positions and coating the phosphor layers separately. be able to. *
- the outer edge of the light emitting unit is circular, but the outer edge of the light emitting unit may be rectangular or polygonal.
- the emitted light from the first blue light emitting element 11 having a short peak wavelength is easily absorbed by the emitted light from the second blue light emitting element 21 having a long peak wavelength. For this reason, it is preferable to arrange
- a configuration in which one light emitting unit 10 is arranged may be employed.
- the first light emitting unit 10 and the second light emitting unit 20 having various shapes can be used, and the combination of the arrangement of the first light emitting unit 10 and the second light emitting unit 20 is also arbitrary.
- the light emitting device according to the second embodiment it is possible to output white light with a predetermined chromaticity and to output all light having a high color rendering index with a high luminance. Others are the same as those of the first embodiment, and redundant description is omitted.
- a lamp that covers the first light emitting unit 10 and the second light emitting unit 20 may be disposed on the substrate 40.
- the output light of the first light emitting unit 10 and the output light of the second light emitting unit 20 are mixed in the lamp, and white light with a desired chromaticity is output from the light emitting device.
- a green phosphor having a main peak on the short wavelength side and emitting green light with a left-right asymmetric emission spectrum is used.
- a green phosphor that emits green light having an emission spectrum having a main peak on the long wavelength side may be used.
- a red phosphor having an absorption spectrum having a main peak on the long wavelength side is used.
- the light-emitting device of the present invention can be used for a light-emitting device that emits light by exciting a phosphor with a light-emitting element.
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Abstract
Description
本発明の第1の実施形態に係る発光装置は、図1に示すように、第1の色度C1の白色光L1を出力する第1の発光ユニット10と、第2の色度C2の白色光L2を出力する第2の発光ユニット20とを備える。図1の発光装置は、第1の発光ユニット10の白色光L1と第2の発光ユニット20の白色光L2を混色して、所定の色度の光を出力する。第1の発光ユニット10と第2の発光ユニット20とは、白色光L1と白色光L2が混色する範囲に近接して配置される。詳細は後述するが、xy色度図において、第1の色度C1と第2の色度C2とは所定の色度について対称に位置し、第1の色度C1及び第2の色度C2と所定の色度との差は0.04以下である。
Rj=100-4.6×ΔEj ・・・(1)
式(1)に示すように、色差ΔEが小さいほど演色評価数が高い。演色評価数を90よりも高くするために、色差ΔEが2以下であることが好ましい。更に演色評価数を高くするために、色差ΔEが1以下であることが更に好ましい。
ΔE={(ΔL)2+(Δa)2+(Δb)2}1/2 ・・・(2)
ここで、座標D1を座標(L1、a1、b1)、座標D2を座標(L2、a2、b2)として、ΔL=|L1-L2|、Δa=|a1-a2|、Δb=|b1-b2|である。
ΔC={(Δx)2+(Δy)2}1/2 ・・・(3)
以下では、色度差ΔCが0.015であり、色温度が3500Kの場合について説明する。
複数個の第1の発光ユニット10と複数個の第2の発光ユニット20を有する発光装置を1列で交互実装し、光拡散タイプの不透明な灯具用カバーで覆うことで、極めて演色性の高い灯具に仕上げることができる。或いは、図31に示すように、第1の発光ユニット10と第2の発光ユニット20を、平面視で縦方向と横方向に交互に2列配置し、光拡散タイプの不透明な灯具用カバーで覆うことによっても、極めて演色性の高い灯具を実現できる。
上記では、1つの発光ユニットに1つの青色発光素子が配置される場合を例示的に示した。しかし、1つの発光ユニットに複数個の青色発光素子を配置してもよい。これにより、発光装置の面積の増大を抑制しつつ、光束を高くすることができる。
上記のように、本発明は実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなろう。
Claims (8)
- 第1の波長を発光スペクトルのピーク波長とする第1の出射光を出射する第1の青色発光素子、及び、前記第1の出射光に励起されて第1の励起光を出射する第1の蛍光体層を有し、前記第1の出射光と前記第1の励起光を混色した第1の色度の白色光を出力する第1の発光ユニットと、
前記第1の波長よりも長波長の第2の波長を発光スペクトルのピーク波長とする第2の出射光を出射する第2の青色発光素子、及び、前記第2の出射光に励起されて第2の励起光を出射する第2の蛍光体層を有し、前記第2の出射光と前記第2の励起光を混色した第2の色度の白色光を出力する第2の発光ユニットと
を備え、
xy色度図において、前記第1の色度と前記第2の色度とが所定の色度について対称に位置し、且つ前記第1の色度及び前記第2の色度と前記所定の色度との差が0.04以下であり、
前記第1の色度の白色光と前記第2の色度の白色光を混色して前記所定の色度の光を出力することを特徴とする発光装置。 - 前記xy色度図において、前記第1の色度及び前記第2の色度と前記所定の色度との差が0.01以上であることを特徴とする請求項1に記載の発光装置。
- 前記第1の色度及び前記第2の色度と前記所定の色度とのL*a*b*色空間における距離に相当する色差が、2以下であることを特徴とする請求項1に記載の発光装置。
- 前記xy色度図において、前記第1の色度を始点とし前記第2の色度を終点とする直線と前記xy色度図の+x方向とのなす角が、135度~180度であることを特徴とする請求項1に記載の発光装置。
- 前記第1の波長と前記第2の波長との差が20nm~40nmであることを特徴とする請求項1に記載の発光装置。
- 前記第1の波長が435nm~445nmの波長範囲に含まれ、前記第2の波長が455nm~470nmの波長範囲に含まれることを特徴とする請求項5に記載の発光装置。
- 前記第1の蛍光体層が、前記第1の発光ユニットから前記第1の色度の白色光が出力されるように設定された成分及び配合比率で、前記第1の出射光に励起されて緑色光を出射する緑色蛍光体と赤色光を出射する赤色蛍光体を含み、
前記第2の蛍光体層が、前記第2の発光ユニットから前記第2の色度の白色光が出力されるように設定された成分及び配合比率で、前記第2の出射光に励起されて緑色光を出射する緑色蛍光体と赤色光を出射する赤色蛍光体を含み、
前記緑色蛍光体が、第1の強度を示す第1の波長と前記第1の強度よりも小さい第2の強度を示す第2の波長を有する発光スペクトルの緑色光を出射し、
前記赤色蛍光体が、前記緑色光に対して前記第1の強度を示す第1の波長よりも前記第2の強度を示す第2の波長における吸収が少ない吸収スペクトルの赤色光を出射する
ことを特徴とする請求項1に記載の発光装置。 - 前記第2の青色発光素子を複数個有する前記第2の発光ユニットを囲んで、前記第1の青色発光素子を複数個有する前記第1の発光ユニットが配置されていることを特徴とする請求項1に記載の発光装置。
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JP2018528161A JP6721048B2 (ja) | 2016-07-21 | 2016-07-21 | 発光装置 |
US16/085,839 US20190088831A1 (en) | 2016-07-21 | 2016-07-21 | Light emitting device |
EP16909522.1A EP3419062A4 (en) | 2016-07-21 | 2016-07-21 | LIGHT-EMITTING DEVICE |
KR1020187026938A KR102092573B1 (ko) | 2016-07-21 | 2016-07-21 | 발광장치 |
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JP2022500841A (ja) * | 2018-09-19 | 2022-01-04 | オスラム オーエルイーディー ゲゼルシャフト ミット ベシュレンクテル ハフツングOSRAM OLED GmbH | 発光素子 |
JP2023527248A (ja) * | 2020-06-16 | 2023-06-27 | シグニファイ ホールディング ビー ヴィ | 高いcriを有する高強度光源 |
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US11145793B2 (en) * | 2019-05-09 | 2021-10-12 | Lumileds Llc | Light emitting diode with high melanopic spectral content |
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JP6721048B2 (ja) | 2020-07-08 |
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