BR102017011101A2 - DEVICE OF EMISSION OF LIGHT - Google Patents

Abstract

light emitting device. The present invention relates to a light emitting device comprising a light emitting element having a peak emission wavelength from 410 nm to 440 nm and a phosphorescent member. the phosphorescent member includes a first phosphorescent substance having a peak emission wavelength from 430 nm to 500 nm and containing an alkaline earth phosphate, a second phosphorescent substance having a peak emission wavelength from 440 nm to 550 nm nm and containing at least one of an alkaline earth aluminate and a silicate containing ca, mg, and cl, a third phosphorescent substance having a peak emission wavelength of 500 nm to 600 nm and containing a rare earth aluminate, a fourth phosphorescent substance having a peak emission wavelength from 610 nm to 650 nm and containing a silicon nitride containing al and at least one of sr and ca, and a fifth phosphorescent substance having a peak emission wavelength of 650 nm to 670 nm and containing a fluorogermanate.

Description

Report of the Invention Patent "LIGHTING DEVICE".

CROSS REFERENCE TO RELATED PATENT APPLICATION

[001] This application claims the benefit of JP Patent Application No. 2016-104853 filed on May 26, 2016 and JP Patent Application 2017-092899 filed on May 9, 2017, the full disclosure of which is incorporated herein by reference.

BACKGROUND TECHNICAL FIELD

The present disclosure relates to a light emitting device.

RELATED TECHNIQUE

Light emitting devices configured to emit white light may employ a combination of a light emitting diode (hereinafter referred to as an "LED") configured to emit blue light and a phosphorescent substance to emit light. Yellow. Such light emitting devices are configured to emit white light which is a mixture of blue light emitted by blue LEDs and yellow light emitted by phosphorescent substances that emit yellow light when excited by blue light. Such light emitting devices provide high radiant intensity and high luminance efficacy in a visible light region, but sufficient radiant intensity in a blue-green region and a red region cannot be obtained. For this reason, a further improvement in the color perception of a radiated object (hereafter may be referred to as "color rendering properties") is desirable.

[004] The light rendering color rendering index rating is specified by JIS Z8726, where predetermined reflectance color samples (R1 to R15) are measured by a test light and a reference light and the difference in color ΔΕΪ (i is an integer from 1 to 15) of each color is computed, so the special color rendering index (Ri) is calculated. The Ri color rendering index (i is an integer from 1 to 15) has a maximum value of 100. That is, the smaller the chromaticity difference between the sample light source and the temperature reference light source. corresponding color plus color rendering index approaches 100. Of the color rendering indexes, an average of R1 to R8 is referred to as the average color rendering index Ra (hereinafter referred to as "Ra "), and R9-R15 are called" spot color rendering indices ". Of the special color rendering indices are each a rating index for R9 red, R10 yellow, R11 green, R12 blue, R13 Cauca siana skin color, R14 tree-green, and R15 Asian skin color.

[005] In order to improve the color rendering properties of a white light, a light emitting device employing an LED to emit blue light and two types of phosphorescent substances to emit green light to yellow light, e.g. chlorosilicate phosphorescent and a garnet-like phosphorescent substance having Y or Tb have been proposed, for example, in JP Publication JP PC-2003-535477. In order to further improve the color rendering properties of a light source, a light emitting device employing a phosphorescent substance to emit red light in addition to phosphorescent substances to emit green to yellow light has been proposed, for example, in Publication of Unexamined Patent Application No. 2008-034188.

SUMMARY

A light emitting device includes a light emitting element having a peak emission wavelength in a range of 410 nm to 440 nm and a phosphorescent member. The phosphorescent member includes a first phosphorescent substance having a peak emission wavelength in the range of 430 nm to 500 nm and containing an alkaline earth phosphate which has Cl in the composition and is activated with Eu, a second phosphorescent substance having a peak emission wavelength in the range 440 nm to 550 nm and containing at least one of an Eu-activated alkaline earth aluminate and a silicate having Ca, Mg, and Cl in the composition and activated with Eu, a third phosphorescent substance having a peak emission wavelength within a range of 500 nm to 600 nm and containing a Ce-activated rare earth aluminate, a fourth phosphorescent substance having a peak emission wavelength within a range of 610 nm at 650 nm and containing a silicon nitride having Al and at least one of Sr and Ca in the composition and activated with Eu, and a fifth phosphorescent substance having a peak emission wavelength and m is a range of 650 nm to 670 nm and containing an Mn activated fluorogermanate.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 is a schematic cross-sectional view showing an example of a light emitting device according to one embodiment of the present disclosure.

[008] Figure 2 is a diagram showing mission spectra of light emitting devices according to examples 1 to 3 and comparative example 1.

Figure 3 is a diagram showing emission spectra of light-emitting devices according to examples 4 to 7 and comparative example 1.

Figure 4 is a diagram showing emission spectra of light emitting devices according to examples 8 to 11 and comparative example 2.

Figure 5 is a diagram showing emission spectra of light emitting devices according to examples 12 to 15 and comparative example 2.

Figure 6 is a diagram showing emission spectra of light-emitting devices according to examples 16 to 19 and comparative example 3.

Figure 7 is a diagram showing emission spectra of light emitting devices according to examples 20 to 23 and comparative example 3.

Figure 8 is a diagram showing emission spectra of light emitting devices according to example 24 and comparative example 4.

Figure 9 is a diagram showing emission spectra of light-emitting devices according to example 25 and comparative example 5.

DETAILED DESCRIPTION

In conventional light emitting devices, the reduction in color differences in yellow, green, red, etc. has been achieved by the use of phosphorescent substances that can emit yellow light, green light and red light, respectively. However, the emission intensity in a blue region that depends mainly on the light emitting element was difficult to approach the corresponding reference light source to reduce the color difference in the blue region. Emission intensity in the blue region may be adjusted, for example, by the amounts of phosphorescent substances and / or addition of a diffusion agent, but satisfactory results have not yet been obtained. Generally, the special R12 color rendering index is greatly affected by emission in the blue wavelength region, and a conventional light emitting device tends to result in a low value of R12. In order to obtain a light emitting device with high color rendering properties, the light emitting device is required to produce continuous emission spectrum over a total visible wavelength range from violet to blue, green to yellow. , and orange to red, similar to sunlight, to increase the value of R12.

Accordingly, a light emitting element having a peak emission wavelength in an almost ultraviolet region that does not involve color rendering index calculation can be used in a light emitting device. However, light in the near ultraviolet region not only affects humans and objects to be irradiated, but also deteriorates light emitting device components and / or causes significant degradation in luminance efficacy of the light emitting device.

According to one embodiment of the present disclosure, a light emitting device having high color rendering properties may be provided.

Specific examples for obtaining objects will be described below. The present disclosure includes embodiments as described below. A light emitting device includes a light emitting element having a peak emission wavelength in a range of 410 nm to 440 nm and a phosphorescent member. The phosphorescent member includes a first phosphorescent substance having a peak emission wavelength in the range of 430 nm to 500 nm and containing an alkaline earth phosphate having Cl in the composition and activated with Eu, a second phosphorescent substance having a peak emission wavelength in a range from 440 nm to 550 nm and containing at least one of Eu-activated alkaline earth aluminate, and silicate having Ca, Mg, and Cl in the composition and activated with Eu, a ter- a phosphorescent substance having a peak emission wavelength within a range of 500 nm to 600 nm and containing the Ce-activated rare earth aluminate, the fourth phosphorescent substance having a peak emission wavelength within a range 610 nm to 650 nm and containing a silicon nitride having Al and at least one of Sr and Ca in the composition and activated with Eu, and a fifth phosphorescent substance having a peak emission wavelength at a 650 nm to 670 nm and containing an Mn-activated fluoroger-manate.

According to one embodiment of the present disclosure, a light emitting device of high color rendering properties may be provided.

Preferred embodiments of the present disclosure will be described below with reference to the drawings. Preferred embodiments are intended as illustrative of light-emitting devices for giving concrete form to the technical ideas of the present invention, and the scope of the invention is not limited to those described below. The relationship between color names and chromaticity coordinates, the relationship between the wavelength range of light and the single color light color name, and others, according to JIS Z8110. Further, the "content of each component in the composition" indicates that in the case where a plural number of substances corresponding to each component is present in the composition, it refers to a total amount of the plural number of substances in the composition.

LIGHTING DEVICE

Figure 1 is a schematic cross-sectional view of a light-emitting device 100 according to one embodiment of the present disclosure. The light emitting device 100 includes a light emitting element 10 having a peak emission wavelength in a range of 410 nm to 440 nm and a phosphorescent member 50. The phosphorescent member 50 contains a phosphorescent substance 70 comprising at least five types of phosphorescent substances: a first phosphorescent substance 71, a second phosphorescent substance 72, a third phosphorescent substance 73, a fourth phosphorescent substance 74, and a fifth phosphorescent substance 75. the first phosphorescent substance 71 has a peak emission wavelength in a range of 430 nm to 500 nm and contains an alkaline earth phosphate that has Cl in the composition and activated with Eu. The second phosphorescent substance 72 has a peak emission wavelength at a 440 nm to 550 nm and contain at least one of Eu-activated alkaline earth aluminate and silicate having Ca, Mg, and Cl in the composition It is activated with Eu. The third phosphorescent substance 73 has a peak emission wavelength in the range of 500 nm to 600 nm and contains a Ce-activated rare earth aluminate. The fourth phosphorescent substance 74 has a peak emission wavelength in a range of 610 nm to 650 nm and contains a silicon nitride that has Al and at least one of Sr and Ca in the composition and activated with Eu. Phosphorescent substance 75 has a peak emission wavelength in a range of 650 nm to 670 nm and containing an Mn-activated fluorogermanate. In addition, the phosphorescent substance 70 contained in the phosphorescent member 50 preferably includes the first phosphorescent substance 71 having a content in the range of 20 wt.% To 80 wt.% With respect to a total amount of the phosphorescent 70.

With the light emitting element 10 having a specific emission wavelength and the phosphorescent member 50 containing at least five specific phosphors with the phosphorescent 71 having a specific range content, a Emission spectrum similar to that of the corresponding reference light source can be produced by the light emitting device 100. Consequently, high color rendering properties can be obtained. Also, by using the light emitting element 10 which has a peak emission wavelength and a wavelength range, safety as a light source and high luminance efficacy can be obtained. In addition, with the use of a certain light emitting element 10 and the phosphorescent member 50 containing the first phosphorescent substance 71 of a certain content, particularly special color rendering index R12 can be improved.

The International Commission on Lighting (CIE) published in 1986 a guide to the color rendering properties that fluorescent lamps should provide. According to the guide, the preferred average Ra color rendering index for lighting environments is indicated, for example, Ra of 60 or more less than 80 for general industrial work areas, etc., 80 or more to less than 90 for homes, hotels, restaurants, shops, offices, schools, hospitals, factories for precision work, etc., 90 or more for clinical examination, museums, etc., requiring high color rendering properties.

Light emitting device 100 has a Ra of 80 or greater, preferably 90 or greater, and more preferably 95 or greater. Also, light emitting device 100 has special color rendering indices R9 to R15 of 50 or greater, preferably 70 or greater, and more preferably 90 or greater, respectively. In particular, R 12 is, for example, 60 or larger, preferably 75 or larger, and more preferably 90 or larger. In addition, a sum of R9 to R15 spot color rendering indices (hereinafter may be referred to as Rt) is, for example, 570 or greater, preferably 600 or greater, and more preferably 650 or greater.

The light-emitting device 100 and light of mixed color light emitted by a light-emitting element 10 and fluorescent light emitted by the first phosphor 71, the second phosphor 72, the third phosphor 73, the fourth phosphorescent substance 74, and the fifth phosphorescent substance 75. For example, with respect to the chromaticity coordinates determined in CIE1931, the mixed light may be adjusted within a range of x = 0,00 to 0,50 and y = 0,00 to 0 , 50, and still in a range of x = 0.25 to 0.40 and y = 0.25 to 0.40. The correlated color temperature of light emitted by light-emitting device 100 may be, for example, 2,000K or greater or 2,500K or greater. The correlated color temperature can be 7,500 K or less, or 7,000 K or less.

The light emitting device 100 will be described below with reference to Figure 1. The light emitting device 100 is an example of a surface mounted type light emitting device. The light emitting device 100 includes a light emitting element 10 or gallium nitride based semiconductor compound for emitting visible light of short wavelength (e.g. 380 nm to 485 nm) with an emission wavelength of peak in a range of 410 nm to 440 nm, and a molded body 40 where the light emitting element 10 is mounted. The molded body 40 is formed by integrally molding a first lead 20 and a second lead 30 with a resin piece 42. Alternatively, the molded body 40 may be formed using a known method using ceramics in place of the resin member 42. The recess defined by a bottom surface and one or more side surfaces is formed in the molded body 40 and the light emitting element 10 is mounted on the bottom surface defining the recess. The light emitting element 10 on positive and negative electrodes which are electrically connected with the first lead 20 and the second lead 30 through wires 60 respectively. The light emitting element 10 is covered by a phosphorescent member 50. For example, the phosphorescent member 50 contains at least five types of phosphorescent substances: the first phosphorescent substance 71, the second phosphorescent substance 72, the third substance phosphorescent 73, fourth phosphorescent substance 74, and fifth phosphorescent substance 75, such as phosphorescent substance 70 to convert the wavelength of light from the light emitting element 10. LIGHT EMISSION ELEMENT [0028] The element Light emission 10 may have a peak emission wavelength in a range of 410 nm to 440 nm, and in view of luminance efficacy, in a range of 420 nm and 440 nm is preferable. Use of a light emitting element 10 which has a peak emission wavelength in the range shown above as an excitation light source allows for obtaining a light emitting device 100 to emit mixed color light from the light. emitted from the light emitting element 10 and fluorescent light emitted from the phosphorescent substance 70. In addition, the light emitted from the light emitting element 10 to the outside can be used effectively, so that the loss of Light emitted from the light emitting device 100 may be reduced and the high efficiency light emitting device 100 may be obtained. In addition, the peak emission wavelength is on one side of the wavelength longer than the near ultraviolet region and has small ultraviolet content, so that the light emitting device 100 can provide security as a source. light and high luminance efficiency.

The half-bandwidth of the emission spectrum of the light-emitting element 10 may be 30 nm or less, for example. For light emitting element 10, a semiconductor light emitting element such as an LED may be used using a semiconductor light emitting element as a light source, a light emitting device 100 having a high Output linearity to introduce in high efficiency and having high stability for mechanical impacts can be obtained. For example, a light emitting element for emitting blue light or green light is a nitride-based semiconductor (lnxAIYGai.x.YN, where X and Y satisfy y 0 <X, 0 ^ Y, and X + Y <1 ) etc., can be used. PHOSPHORESCENT SUBSTANCE MEMBER 50 The phosphorescent member 50 may include, for example, a phosphorescent substance 70 and a resin material. Phosphorescent member 50 includes a phosphorescent substance 70 that includes at least a first phosphorescent substance 71 to emit blue light, at least a second phosphorescent substance 72 to emit green light, at least a third phosphorescent substance 73 to emit yellow light, at least at least one fourth phosphorescent 74 to emit red light, and at least one fifth phosphorescent 75 to emit deep red light, respectively, by absorbing the light emitted from the light emitting element 10. The first phosphorescent substance 71 to the fifth substance Phosphorescent 75 has different compositions from each other. The characteristics of light emitting device 100 such as luminance efficacy and color rendering properties may be adjusted to a desired range by appropriately selecting the composition ratio of the first phosphorescent substance 71 to the fifth phosphorescent substance 75. FIRST Phosphorescent Substance 71 The first phosphorescent substance 71 is a blue light-emitting phosphorescent substance that has a peak emission wavelength in the range of 430 nm to 500 nm and contains an alkaline earth phosphate that has Cl in the composition and activated with I. The first phosphorescent substance 71 preferably has a composition, for example represented by the formula (1) shown below, more preferably has a composition (1 ') shown below. With this, the luminance characteristics of the first phosphorescent substance 71 described below can be obtained relatively easily. (1) (1 *) The first phosphorescent substance 71 has a maximum excitation wavelength in a range of, for example, 360 nm to 440 nm, preferably in a range of 370 nm to 430 nm. The first phosphorescent substance 71 may be effectively excited by light from the peak emission wavelength range of the light emitting element 10 described above. The first phosphorescent substance 71 may have a peak emission wavelength in a range of, for example, 430 nm to 500 nm, and in view of luminance efficacy, in a range of 440 nm and 480 nm is preferable. Accordingly, in the emission spectrum of the light-emitting device 100, particularly in the blue region, overlapping between the emission spectrum of the first phosphor 71 and the emission spectra of the light emitting element 10 and the second phosphor 72 be reduced. In addition, by the emission spectrum of the first phosphor 71 and the emission spectrum of the light-emitting element 10, the emission intensity in the blue region of the light-emitting device 100 which was attributed exclusively to the light-emitting element 10 can be easily made closer to the corresponding reference light source, and thus the color rendering properties of the light emitting device 100 can be improved. The first phosphorescent substance 71 has a width of half the value of the emission spectrum, for example in a range of 29 nm to 49 nm, preferably in a range of 34 nm to 44 nm. In such a bandwidth range, color purity can be improved and the emission spectrum in the blue region can become closer to the corresponding reference light source, and the color rendering properties of the emitting device can be improved. 100 light can be further improved.

For example, when the light emitting device 100 emits light of correlated color temperature in a range of 2,000K to 7,500K, the percentage content (ie the amount of the first phosphorescent / total amount of phosphorescent ) of the first phosphorescent 71 with respect to the total content of the phosphorescent substances in the phosphorescent member 50 may be 20 mass% or greater, preferably 25 mass% or greater, more preferably 40 mass% or greater. The percentage content of the first phosphorescent substance 71 may be, for example, 80 mass% or less, preferably 75 mass% or less, more preferably 70 mass% or less. When the percent content of the first phosphor 71 is within the range described above, the emission spectrum of the light-emitting device 100 may be brought closer to the corresponding reference light source, so that the color rendering properties of the device 100 light emission can be further improved.

For example, when light emitting device 100 emits light of correlated color temperature in a range of 2,000K to 7,500K, the content ratio of the first phosphorescent 71 with respect to the third phosphorescent 73 (i.e. , the first phosphorescent substance 71 / the third phosphorescent substance 73) may be, for example, 0.3 to 7, preferably 0.5 to 6.5, more preferably 0.6 to 6, and still preferably 1.8 to 6. With the content ratio in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the emitting device 100 light can be further improved.

In the emission spectrum of the light-emitting device 100, with the wavelength on the horizontal axis and the relative intensity on the vertical axis, the ratio of the peak emission intensity of the first phosphorescent 71 to the intensity peak emission intensity of the light-emitting element 10 (peak emission intensity of the first phosphor 71 / peak emission intensity of the light-emitting element 10; hereinafter also simply referred to as the "intensity ratio"). peak emission "), for example, when the light emitting device 100 is configured to emit correlated color temperature light in a range of 2,000 K to 7,500K, for example, in a range of 0.15 to 2, preferably in a range of 0.3 to 1.8, and more preferably in a range of 0.5 to 1.5. When the peak emission intensity ratio is in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of light emitting device 100 can be further improved. The emission intensity of the peak ratio can be calculated such that the maximum emission intensity value in the range 410 nm to 440 nm is assumed to be the peak emission intensity of the light emitting element 10, and the maximum emission intensity within a range of 440 nm to 470 nm is assumed to be the peak emission intensity of the first phosphorescent substance 71.

For example, when the light emitting device 100 emits light of correlated color temperature in a range of 5,500K to 7,500K, the percentage content of the first phosphor 71 may be, for example, 30% by mass or larger, preferably 35 mass% or greater, more preferably 45 mass% or greater. The percentage content of the first phosphorescent substance 71 may be, for example, 80 mass% or less, preferably 77 mass% or less, more preferably 75 mass% or less. With the content ratio in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 light can be further improved.

For example, when light emitting device 100 emits light of correlated color temperature in a range of 5,500K to 7,500K, the content ratio of the first phosphor 71 with respect to the third phosphor 73 may be, for example 0.9 to 6, preferably 1.5 to 5.9, more preferably 2.5 to 5.85. With the content ratio in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 light can be further improved.

For example, when the light emitting device 100 emits light of correlated color temperature in a range of 5,500Κ to 7,500K, the peak ratio emission intensity of the first phosphor 71 with respect to the emission element of light 10 may be, for example, 0.4 to 1.5, preferably 0.45 to 1.47, more preferably 0.70 to 1.44. When the peak ratio emission intensity is in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of light emitting device 100 can be further improved.

For example, when light emitting device 100 emits light having a correlated color temperature of 4,500K or more and less than 5,500K, the percentage content of the first phosphor 71 may be, for example, 30%. by mass or greater, preferably 45 mass or greater, more preferably 55 mass or greater. The percentage content of the first phosphorescent substance 71 may be, for example, 80 mass% or less, preferably 78 mass% or less, more preferably 76 mass% or less. With the percent content in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 can be further improved.

For example, when the light emitting device 100 emits light having a correlated color temperature of 4,500K or more and less than 5,500K, the content ratio of the first phosphor 71 with respect to the third phosphor 73 it may be, for example, 0.8 to 5.5, preferably 1.5 to 5.4, more preferably 2 to 5.35. With the range content ratio as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 light emission can be further improved.

For example, when light emitting device 100 emits light having a correlated color temperature of 4,500K or more or less than 5,500K, the peak ratio emission intensity of the first phosphor 71 with respect to Light emitting element 10 may be, for example, 0.4 to 1.5, preferably 0.5 to 1.45, more preferably 0.6 to 1.4. When the peak ratio emission intensity is in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of light emitting device 100 can be further improved.

For example, when light emitting device 100 emits light having a correlated color temperature of 3,500K or more or less than 4,500K, the percentage content of the first phosphor 71 may be, for example, 20%. mass or greater, preferably 50 mass or greater, more preferably 55 mass or greater. The percent content of the first phosphorescent substance 71 may be, for example, 75 mass% or less, preferably 70 mass% or less, more preferably 64 mass% or less. With the percent content in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 can be further improved.

For example, when light emitting device 100 emits light having a correlated color temperature of 3,500K or more or less than 4,500K, the content ratio of the first phosphor 71 with respect to the third phosphor 73 it may be, for example, 0.6 to 4.2, preferably 1.8 to 4, more preferably 2.2 to 3.3. With the content ratio in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 light can be further improved.

For example, when light emitting device 100 emits light having a correlated color temperature of 3,500K or more or less than 4,500K, the peak ratio emission intensity of the first phosphor 71 with respect to Light emitting element 10 may be, for example, 0.3 to 1.3, preferably 0.6 to 1.25, more preferably 0.8 to 1.1. When the peak ratio emission intensity is in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of light emitting device 100 can be further improved.

For example, when light emitting device 100 emits light having a correlated color temperature of 2,500K or more or less than 3,500K, the percent content of the first phosphor 71 may be 30% by weight or greater. preferably 35 mass% or greater, more preferably 40 mass% or greater. The percentage content of the first phosphorescent substance 71 may be, for example, 65% by weight or less, preferably 60% by weight or less, more preferably 55% by weight or less. With the percent content in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 can be further improved.

For example, when light emitting device 100 emits light having a correlated color temperature of 2,500K or more or less than 3,500K, the content ratio of the first phosphor 71 with respect to the third phosphor 73 it may be, for example, 1 to 4, preferably 1.5 to 3.5, more preferably 1.7 to 2.7. With the content ratio in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 light can be further improved.

For example, when the light emitting device 100 emits light having a correlated color temperature of 2,500K or more or less than 3,500K, the peak emission intensity of the first phosphor 71 with respect to the Light emission 10 may be, for example, 0.2 to 1.4, preferably 0.5 to 1.2, more preferably 0.7 to 1.1. When the peak ratio emission intensity is in the range as described above, the emission spectrum of the light emitting device 100 can be made much closer to the corresponding reference light source, so that the color rendering properties of light emitting device 100 can be further improved. SECOND PHOSPHORESCENT SUBSTANCE 72 The second phosphorescent substance 72 is a green light-emitting phosphorescent substance that has a peak emission wavelength in the range 440 nm to 550 nm and contains at least one of an alkaline aluminate. Eu-activated earth or a silicate having Ca, Mg, and Cl in the composition and activated with Eu. The second phosphorescent substance 72 preferably includes at least one alkaline earth aluminate described above. The alkaline earth aluminate preferably has a composition, for example represented by the formula (2a) shown below, more preferably has a composition (2a ') shown below. The silicate preferably has a composition, for example represented by formula (2b) shown below, more preferably has a composition (2b1) shown below. With this, the luminance characteristics of the second phosphor 72 described below can be obtained relatively easily. (2a) (2a ') (2b) (2b') When the second phosphor 72 has a content represented by the formula (2b), the second phosphor 72 contains at least one element selected from the group consisting of Ca, Sr, and Ba, wherein at least Ca is preferably contained, and more preferably, a Ca content of Ca, Sr, and Ba is 90 mol% or greater. The second phosphorescent substance 72 contains at least one element selected from the group consisting of F, Cl, and Br, wherein at least Cl is preferably contained, more preferably a Cl content of F, Cl, and Br is 90. % mol or greater.

The second phosphorescent substance 72 has a maximum excitation wavelength in a range of, for example, 270 nm to 470 nm, preferably in a range of 370 nm to 460 nm. The second phosphorescent substance 72 can be effectively excited by light having a peak emission in the wavelength range of the light emitting element 10 described above.

When the second phosphor 72 has a composition represented by formula (2a), the peak emission wavelength may be, for example, in a range of 400 nm to 550 nm, preferably in a range of 460 nm. and 530 nm. In addition, a width of half the value of the emission spectrum may be, for example, in a range of 58 nm to 78 nm, preferably in a range of 63 nm to 73 nm.

When the second phosphor 72 has a composition represented by formula (2b), the peak emission wavelength may be, for example, in a range of 510 nm to 540 nm, preferably in a range of 520 nm. at 530 nm. In addition, a width of half the value of the emission spectrum is, for example, in a range of 50 nm to 75 nm, preferably in a range of 58 nm to 68 nm.

By using at least one of such a second phosphorescent substance 72, the color purity can be improved and the emission spectrum in the green region can be made closer to the corresponding reference light, and the rendering properties of Colors of the light emitting device 100 can be further enhanced.

For example, when the light emitting device 100 emits light of correlated color temperature in a range of 2,000K to 7,500K, the percentage content of the second phosphorescent 72 with respect to the total amount of phosphorescent substances in the limb. phosphorescent substance 50 (i.e. the amount of second phosphorescent substance / total amount of phosphorescent substances) may be 0.5 mass% or greater, preferably 0.7 mass% or greater, more preferably 1 mass% or greater. The percent content of the second phosphor 72 may be 30 wt% or less, preferably 20 wt% or less, more preferably 15 wt% or less.

For example, when the light emitting device 100 emits correlated color temperature light in a range of 5,500K to 7,500K, the percentage content of the second phosphor 72 may be 4 mass% or greater, preferably 5%. Mass% or greater, more preferably 6 Mass% or greater. The percentage content of the second phosphor 72 may be, for example, 20 mass% or less, preferably 13 mass% or less, more preferably 11 mass% or less.

For example, when light emitting device 100 emits light having a correlated color temperature of 4,500K or more or less than 5,500K, the percentage content of the second phosphor 72 may be, for example, 0, 5 mass% or greater, preferably 0.7 mass% or greater, more preferably 1 mass% or greater. The percentage content of the second phosphor 72 may be, for example, 4 mass% or less, more preferably 3 mass% or less, more preferably 2 mass% or less.

For example, when the light emitting device 100 emits light of correlated color temperature of 3,500K or more or less than 4,500K, the percentage content of the second phosphor 72 may be, for example, 1.5 mass% or greater, preferably 2 mass% or greater, more preferably 2.2 mass% or greater. The percentage content of the second phosphor 72 may be, for example, 5 mass% or less, more preferably 3.5 mass% or less, more preferably 3 mass% or less.

For example, when light emitting device 100 emits light of correlated color temperature of 2,500K or more or less than 3,500K, the percentage content of second phosphor 72 may be, for example, 1.5 mass% or greater, preferably 2 mass% or greater, more preferably 2.2 mass% or greater. The percentage content of the second phosphor 72 may be, for example, 5 mass% or less, more preferably 3.5 mass% or less, more preferably 3 mass% or less.

When the percentage content of the second phosphor 72 is in one of the ranges described above, the emission spectrum of the light emitting device 100 in the green region may be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 can be further improved. THIRD PHOSPHORESCENT SUBSTANCE 73 The third phosphorescent substance 73 is a yellow light-emitting phosphorescent substance that has a peak emission wavelength in the range of 500 nm to 600 nm and contains a Ce-activated rare earth aluminate. . The third phosphorous substance 73 preferably has a composition represented by the formula (3) shown below, more preferably has a composition (3 ') shown below. By this, the luminance characteristics of the third phosphor 73 described below can be obtained relatively easily. (Y, Lu, Gd) 3 (AI, Ga) 5012: Ce (3) Y3AI5012: Ce (3 ') A third phosphorescent substance 73 has a maximum excitation wavelength, for example over a range of 220 nm to 490 nm, preferably in a range of 430 nm to 470 nm. The third phosphorescent substance 73 may be effectively excited by light from the peak emission wavelength range of the light emitting element 10 described above. The third phosphor 73 has a peak emission wavelength in a range of 480 nm to 630 nm, more preferably in a range of 500 nm to 560 nm. Accordingly, the overlap between the emission spectrum of the third phosphor 73 and the emission spectrum of the second phosphor 72 may be reduced, and a portion of the emission spectrum in the yellow region may be made closer to the corresponding reference light of so that the color rendering properties of the light emitting device 100 can be further improved. The third phosphor 73 in a width of half the value of the emission spectrum, for example in a range of 95 nm to 115 nm, preferably in a range of 100 nm to 110 nm. In such a half-bandwidth range, color purity can be improved and the emission spectrum in the yellow region can be made closer to the corresponding reference light, so that the color rendering properties of the color-emitting device can be improved. 100 light can be further improved.

For example, when light emitting device 100 emits light of correlated color temperature in a range of 2,000K to 7,500K, the percentage content of the first phosphor 73 with respect to the total content of phosphor in the limb of phosphorescent substance 50 (i.e. the amount of the third phosphorescent substance / total amount of the phosphorescent substances) can be, for example, 8 mass% or greater, preferably 10 mass% or greater, more preferably 12 mass% or greater. The percent content of the third phosphor 73 may be, for example, 40 mass% or less, preferably 30 mass% or less, more preferably 25 mass% or less.

For example, when light emitting device 100 emits light of correlated color temperature in a range of 5,500K to 7,500K, the percentage content of the third phosphor 73 may be, for example, 8% by mass or larger, preferably 10 mass% or greater, more preferably 12 mass% or greater. The percentage content of the third phosphor 73 may be, for example, 40 mass% or less, preferably 30 mass% or less, more preferably 22 mass% or less.

For example, when the light emitting device 100 emits light of a color correlated temperature 4,500K or more or less than 5,500K, the percentage content of the third phosphor 73 may be, for example, 10% by mass. or greater, preferably 12 mass% or greater, more preferably 14 mass% or greater. The percent content of the third phosphor 73 may be, for example, 45 mass% or less, preferably 30 mass% or less, more preferably 25 mass% or less.

For example, when the light emitting device 100 emits light of a color correlated temperature 3,500K or more or less than 4,500K, the percentage content of the third phosphor 73 may be, for example, 10% by mass. or greater, preferably 15 mass% or greater, more preferably 17.5 mass% or greater. The percentage content of the third phosphor 73 can be, for example, 50 mass% or less, preferably 35 mass% or less, more preferably 25 mass% or less.

For example, when the light emitting device 100 emits light of a color correlated temperature 2,500K or more than 3,500K, the percentage content of the third phosphor 73 may be, for example, 15% by mass. or larger, preferably 17.5 mass% or greater, more preferably 20 mass% or greater. The percent content of the third phosphor 73 may be, for example, 40 mass% or less, preferably 30 mass% or less, more preferably 25 mass% or less.

When the percent content of the third phosphor 73 is in one of the ranges described above, the emission spectrum in the yellow region of the light emitting device 100 may be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 can be further improved. Fourth phosphorescent substance 74 The fourth phosphorescent substance 74 is a phosphorescent substance that has a peak emission wavelength in the range 610 nm to 650 nm and contains a silicon nitride having Al and at least one of Sr and Ca in the composition and activated with Eu. The fourth phosphorescent substance 74 preferably has a composition represented by formula (4) shown below. With this, the luminance characteristics of the fourth phosphor 74 described below can be obtained relatively easily. (Sr, Ca) AISiN3: Eu (4) When the fourth phosphor 74 has the content represented by formula (4), the fourth phosphor 74 contains at least one element selected from the group consisting of Sr and Ca wherein both Sr and Ca are preferably contained, more preferably Sr and Ca, 0.8 mol% or greater of Sr are contained. Accordingly, the peak emission wavelength of the fourth phosphorescent substance 74 can be made in a desired range.

The fourth phosphorescent substance 74 may have a peak emission wavelength in a range of 620 nm to 650 nm, preferably in a range of 630 nm and 645 nm. With the peak emission wavelength equal to or greater than the lower limit value shown above, insufficient emission intensity may be avoided between the peak emission wavelength of the fourth phosphor 74 and the length peak emission wave of the fifth phosphorescent substance 75 to be described below, and a portion of the emission spectrum in the red region may be made closer to the corresponding reference light. With the peak emission wavelength equal to or less than the upper limit value, the overlap between the emission spectrum of the fourth phosphor 74 and the emission spectrum of the fifth phosphor 75 may be reduced and the effect of the Emission spectrum of the fifth phosphorescent substance 75 can be obtained effectively, and the color rendering properties of the light emitting device 100 can be further improved. The fourth phosphorescent substance 74 has a width of half the value of the emission spectrum, for example in a range of 80 nm to 100 nm, preferably in a range of 85 nm to 95 nm. With half bandwidth in a band as described above, the overlap of the emission spectrum of the fourth phosphor 74 and the emission spectrum of the fifth phosphor 75 may be reduced, so that the effect of the emission spectrum of the fifth phosphor Phosphorescent substance 75 can be obtained effectively, and the color rendering properties of the light emitting device 100 can be further improved.

For example, when light emitting device 100 emits light of correlated color temperature in a range of 2,000K to 7,500K, the percent content of the fourth phosphor 74 with respect to the total phosphor content in the limb of phosphorescent substance 50 (i.e. amount of the fourth phosphorescent substance 74 / total amount of phosphorescent substances) may be, for example, 0.5 mass% or greater, preferably 1 mass% or greater, more preferably 1.5 mass%. mass or greater. The percent content of the fourth phosphor 74 may be, for example, 6 mass% or less, preferably 5 mass% or less, more preferably 4 mass% or less.

For example, when light emitting device 100 emits light of correlated color temperature in a range of 5,500K to 7,500K, the percent content of the fourth phosphor 74 may be, for example, 1% by weight or larger, preferably 1.5 wt.% or greater, more preferably 2 wt.% or greater. The percent content of the fourth phosphorous substance 74 may be, for example, 6 mass% or less, preferably 4 mass% or less, more preferably 3.8 mass% or less.

For example, when the light emitting device 100 emits light of a color correlated temperature 4,500K or more or less than 5,500K, the percent content of the fourth phosphor 74 may be, for example, 0.5%. mass or greater, preferably 1 mass% or greater, more preferably 1.5 mass% or greater. The percent content of the fourth phosphor 74 may be, for example, 3.5 mass% or less, preferably 3 mass% or less, more preferably 2.6 mass% or less.

For example, when the light emitting device 100 emits light of a color correlated temperature 3,500K or more than 4,500K, the percentage content of the fourth phosphor 74 may be, for example, 1% by mass. or larger, preferably 1.5 mass% or greater, more preferably 2.27 mass% or greater. The percentage content of the fourth phosphor 74 may be, for example, 4.8 mass% or less, preferably 3.5 mass% or less, more preferably 3 mass% or less.

For example, when the light emitting device 100 emits light of a color correlated temperature 2,500K or more or less than 3,500K, the percent content of the fourth phosphor 74 may be, for example, 2.5%. mass or greater, preferably 3 mass or greater, more preferably 3.2 mass or greater. The percentage content of the fourth phosphor 74 may be, for example, 4.5 mass% or less, preferably 4 mass% or less, more preferably 3.5 mass% or less.

When the percent content of the fourth phosphor 74 is in one of the ranges described above, the emission spectrum in the red range of the light emitting device 100 may be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 can be further improved. FIFTH Phosphorescent Substance 75 Fifth phosphorescent substance 75 is a deep red light emitting phosphorescent substance having a peak emission wavelength in the range 650 nm to 670 nm and containing a ogη-activated fluorogermanate. The fifth phosphorescent substance 75 preferably has a composition of at least one of the fluorogermanates represented by formulas (5a) or (5b) shown below. The peak emission wavelengths of the phosphorescent substances represented by formulas (5a) or (5b) are 650 nm or greater, which are larger than other red emission phosphorescent substances. Accordingly, the emission spectrum is a region of wavelength that can be effectively made close to the corresponding reference light, and the color rendering properties of the light emitting device 100 can be further enhanced. 3.5Mg0O, 5MgF2Ge02: Mn (5a) (xs) Mg0- (s / 2) Sc203yMgF2-uCaF2 (1-t) Ge02- (t / 2) Mt203: zMn (5b) In formula (5b), x, y, z, s, t, i satisfy, respectively, 2.0 ^ x ^ 4.0, 0 <y <1.5, 0 <z <0.05, 0 ^ s <0.5, 0 <t <0.5, and 0 ^ u <1.5, and further preferably satisfy y + u <1.5. In formula (5b), M1 is at least one element selected from the group consisting of Al, Ga, and In.

In formula (5b), 0.05% <0.3 and 0.05% <0.3 are preferably satisfied, whereby the luminance can be further improved. The fifth phosphorescent substance 75 preferably has a composition represented by formula (5b1) shown below. Accordingly, the fifth phosphorescent substance 75 can be effectively excited by light having a wavelength range containing the peak emission wavelength of the light emitting element 10 described above. 3.4MgOO, 1Sc203O, 5MgF2'0,885Ge02O, 1Ga203: 0.015Mn (5b ') The fifth phosphorescent substance 75 has a width of half the value of the emission spectrum, for example 45 nm or less, preferably 40 nm. or less. In such half-band bands, color purity may be improved and the emission spectrum in the red region may be made closer to the corresponding reference light, and the color rendering properties of the light-emitting device 100 may be enhanced. still improved. In addition, the fifth phosphor 75 preferably has an emission spectrum where, when the maximum emission intensity is assumed to be 100%, the average emission intensity in a range of 600 nm to 620 nm is, for example, 20%. or less, preferably 10% or less. With the peak emission wavelength equal to or less than the upper limit value shown above, the overlap between the emission spectrum of the fifth phosphorescent 75 to be described below and the emission spectrum of the fourth phosphorescent 74 may be reduced, and the effect of the emission spectrum of the fourth phosphor 74 can be obtained effectively, and the color rendering properties of the light emitting device 100 can be further enhanced.

For example, when the light emitting device 100 emits light of correlated color temperature in a range of 2,000K to 7,500K, the percent content of the fifth phosphorescent 75 with respect to the total phosphorescent content (i.e. , the amount of the fifth phosphorescent 75 / total amount of phosphorescent) in the phosphorescent member 50 may be, for example, 1 mass% or greater, preferably 2 mass% or greater, more preferably 3 mass% or greater. . The percent content of the fifth phosphorescent substance 75 may be, for example, 40 mass% or less, preferably 35 mass% or less, more preferably 30 mass% or less.

For example, when light emitting device 100 emits light of correlated color temperature in a range of 5,500K to 7,500K, the percent content of the fifth phosphor 75 may be, for example, 1% by weight or larger, preferably 2 wt.% or greater, more preferably 3 wt.% or greater. The percent content of the fifth phosphor 75 may be, for example, 12 mass% or less, preferably 6 mass% or less, more preferably 5.5 mass% or less.

For example, when the light emitting device 100 emits light of correlated color temperature in a range of 4,500K or more or less than 5,500K, the percent content of the fifth phosphor 75 may be, for example, 3 mass% or greater, preferably 5 mass% or greater, more preferably 7 mass% or greater. The percent content of the fifth phosphor 75 may be, for example, 30 mass% or less, preferably 20 mass% or less, more preferably 15 mass% or less.

For example, when the light emitting device 100 emits light of correlated color temperature in a range of 3,500K or more than 4,500K, the percentage content of the first phosphor 75 may be, for example, 5 mass% or greater, preferably 8 mass% or greater, more preferably 10 mass% or greater. The percent content of the fifth phosphor 75 may be, for example, 28 mass% or less, preferably 20 mass% or less, more preferably 16 mass% or less.

For example, when the light emitting device 100 emits light of correlated color temperature in a range of 2,500K or more than 3,500K, the percentage content of the first phosphor 75 may be, for example, 15 mass% or greater, preferably 18 mass% or greater, more preferably 20 mass% or greater. The percent content of the fifth phosphorescent substance 75 may be, for example, 45 mass% or less, preferably 40 mass% or less, more preferably 30 mass% or less.

When the percent content of the fifth phosphor 75 is in one of the ranges described above, the emission spectrum of the light emitting device 100 in the red region may be made much closer to the corresponding reference light source, so that the color rendering properties of the light emitting device 100 can be further improved.

The phosphorescent member 50 may optionally contain one or more phosphorescent substances other than the first phosphorescent substance 71 through the fifth phosphorescent substance 75. Examples of other phosphorescent substances include Ca3Sc2Si3012: Ce, CaSc204: Ce, (La, Y) 3Si6Nn: Ce, (Ca, Sr, Ba) 3Si609N4: I, (Ca, Sr, Ba) 3Si6012N2: I, (Ba, Sr, Ca) Si202N2: I, (Ca, Sr, Ba) 2Si5N8: I, (Ca, Sr, Ba) S: Me, (Ba, Sr, Ca) Ga2S4: Me, and K2 (Si, Ti, Ge) F6: Mn. When the phosphorescent member 50 contains one or more other phosphorescent substances, the percentages of these are approximately adjusted to obtain the brightness characteristics obtainable in accordance with the present disclosure. The percentages of one or more other phosphorescent substances with respect to the total amount of the phosphorescent substances may be, for example, 2 mass% or less, preferably 1 mass% or less.

RESIN

Examples of the resin contained in the phosphorescent member 50 include thermoplastic resin and thermosetting resin. More specific examples of thermosetting resin resin include epoxy resin, silicon resin, and modified silicone resin such as epoxy modified silicon resin. OTHER COMPONENTS

The phosphorescent member 50 may optionally contain one or more components in addition to the phosphorescent substance 70 and the resin. Examples of such optional components include a filler such as silica, barium titanate, titanium oxide, aluminum oxide, and an optical stabilizer, and a coloring agent. When the phosphorescent member 50 includes one or more other components, the contents thereof may be suitably defined according to purpose and the like. For example, if you include a filler like the other component, the content of the filler may be in the range of 0.01 to 20 pts. in mass with respect to 100 pts. by mass of the resin.

EXAMPLES

In the following, the present invention will be described more specifically with reference to the examples, which, however, are not intended to limit the present invention. Phosphorescent Substance 70 Prior to producing the light-emitting device 100, the first phosphorescent substance 71 to the fifth phosphorescent substance 75 described below were provided, respectively.

For the first phosphorescent substance 71, a blue light-emitting phosphorescent substance having a composition represented by Ca5 (P04) 3 Cl: I and having a peak emission wavelength of about 460 nm (hereinafter may be referred to as "CCA") has been provided.

For the second phosphorescent substance 72, a green light-emitting phosphor having a composition represented by Sr4AI14025: Eu and having a peak emission wavelength of about 494 nm (hereinafter may be referred to as " SAE ") has been provided.

For the third phosphorescent substance 73, a rare earth aluminum garnet phosphorescent substance having a composition represented by Y3AI50i2: Ce and having a peak emission wavelength of about 544 nm (hereinafter may be referred to as "YAG") has been provided.

For the fourth phosphor 74, a red light emitting phosphor having a composition represented by (Sr, Ca) AISiN3: I and having a peak emission wavelength of about 635 nm (hereinafter may be referred to as "SCASN") has been provided.

For the fifth phosphorescent substance 75, a deep red light-emitting phosphorescent substance having a composition represented by 3.4 MHz. 1Sc2O30. 5MgF2 0.885Ge020.1Ga203: 0.015Mn and having a peak emission wavelength of about 658 nm (hereinafter referred to as "MGF") was provided. LIGHT EMISSION ELEMENT For a light emitting element 10, a blue-violet LED having a peak emission wavelength of 430 nm was provided.

EVALUATION

The emission color chromaticity coordinates, correlated color temperature (Tcp: K), average color rendering index (Ra), special color rendering indices (R9 to R15) of the light emitting devices 100 obtained in the Examples and Comparative Examples were measured. In addition, the sum of R9 to R15 spot color rendering indices (hereinafter referred to as Rt) has been calculated. The average color rendering index and special color indices may be collectively referred to as "color rendering indices". The emission spectrum of the light emitting device 100 was measured using a light beam measuring apparatus equipped with an integral sphere. EXAMPLE 1 Production of Light Emitting Device 100 A light emitting device 100 was produced as described below, using a combination of light emitting element 10 to emit blue-violet light having a wavelength. 430 nm peak emission, the first phosphor 71 (CCA), the second phosphor 72 (SAE), the third phosphor 73 (YAG), the fourth phosphor 74 (SCASN), and the fifth phosphor 75 (FGM).

A phosphorescent substance 70 containing the first phosphorescent substance 71 (CCA) with a percentage content of 33.3% by mass with respect to the total content of phosphorescent substances, and other phosphorescent substances with percentages with respect to the total content of phosphorescent substances as shown in Table 1, respectively, were combined to obtain a correlated color temperature of about 6,500 K. Phosphorescent substance 70 was added to the silicone resin and mixed and dispersed, and then further smoked to obtain a phosphorescent substance-containing resin composition. . The ratio of the percentage contents of the first phosphorescent 71 with respect to the amount of resin (ie first phosphorescent 71 / resin) was 15%. Thereafter, the phosphorescent-containing resin composition was injected to enclose the light-emitting element 10, and heat was applied to harden the resin composition. Thus, Example 1 of light emitting device 100 was produced. EXAMPLES 2 TO 7 Examples 2 to 7 of the light emitting device 100 were produced in a similar manner as in Example 1, except that the phosphorescent contents were adjusted to meet the percentages shown in Table 1. EXAMPLE COMPARATIVE 1 Comparative Example 1 of Light Emitting Device 100 was produced in a similar manner as in Example 1, except that the first phosphorescent substance 71 (CCA) was not used and a combination of the second phosphorescent substance 72 (SAE). ), the third phosphorescent substance 73 (YAG), the fourth phosphorescent substance 74 (SCASN), and the fifth phosphorescent substance 75 (FGM) was used as the phosphorescent substance 70.

Examples 1 through 7, and Comparative Example 1 of the light emitting device 100 have been evaluated and the evaluation results except that the color rendering indices are shown in Table 1, the results of the color rendering indices are shown in Table 2. TABLE 1 As shown in Tables 1 and 2, Examples 1 to 7 containing the first phosphorescent 71 show higher Ra values than Comparative Example 1 which does not contain the first phosphorescent 71. In addition, examples 1 to 7 show values of 60 or greater for all indices from R9 to R15. On the other hand, Comparative Example 1 which does not contain the first phosphorescent substance 71 shows Ra lower than any examples and R12 of 38 which is much smaller than the examples.

As shown in Table 1, the correlated color temperatures of Examples 1 to 7, and Comparative Example 1 are all in a range of 5,500 K to 7,500 K. In Examples 4, 5, 6, and 7, as shown in Table 1, the percentage contents of the first phosphorescent 71 with respect to the total content of the phosphorescent were, respectively, in a range of 60% by mass to 80% by mass, and the ratio of contents of the first phosphorescent 71 with respect to The content of the third phosphor 73 was, respectively, in a range of 2.5 to 6.0. As shown in Table 2, examples 4, 5, 6, and 7 show, respectively, R12 of 90 or greater, and also Rt of 650 or greater, indicating particularly good color rendering properties.

Figure 2 shows emission spectra of light-emitting devices according to Comparative Example 1 and examples 1 to 3, and Figure 3 shows emission spectra of light-emitting devices according to Comparative Example 1 and Examples 4 to 7, the emission spectrum being normalized to the emission intensity at 530 nm of a 6,500K reference light source. The emission spectrum shown in figure 2 and figure 3 shows relative emission intensity versus wavelength. In examples 4, 5, 6, and 7, as shown in Table 1, the peak emission intensity ratios of the first phosphorescent 71 with respect to the light emitting element 10 in the emission spectra are, respectively, in a range. from 0.7 to 1.5. As shown in Table 2, examples 4, 5, 6, and 7 show, respectively, R12 of 90 or greater, and also Rt of 650 or greater, indicating particularly good color rendering properties. EXAMPLES 8 to 15 Examples 8 to 15 of the light emitting device 100 were produced in a similar manner as in Example 1, except that the phosphorescent substance levels were adjusted to meet the content ratios shown in Table 3 for adjust the correlated color temperature by about 5,000K. COMPARATIVE EXAMPLE 2 Comparative Example 2 of light emitting device 100 was produced in a similar manner as in Example 1, except that the first phosphorescent substance 71 (CCA) was not used and a combination of the second phosphorescent substance 72 ( SAE), third phosphor 73 (YAG), fourth phosphor 74 (SCASN), and fifth phosphor 75 (FGM) were used as phosphor 70, and the correlated color temperature was adjusted to about 5,000. K.

Examples 8 through 15, and Comparative Example 2 of light emitting device 100 have been evaluated and the evaluation results except for color rendering indices are shown in Table 3, the results of color rendering indices are TABLE 3 Ό0110] As seen from tables 3 and 4, examples 8 to 15 containing the first phosphorescent 71 show higher Ra values than Comparative Example 2 which does not contain the first phosphorescent 71. In addition moreover, examples 8 through 15 show values of 60 or greater for all indices from R 9 to R 15. On the other hand, Comparative Example 2 which does not contain the first phosphorescent substance 71 shows Ra less than any examples and R12 of 35 which is much less than the Examples.

As shown in Table 3, the corrected color temperature of Examples 8 to 15, and Comparative Example 2 are all in a range of 4,500 K to 5,500 K. In Examples 10, 11, 12, 13, 14, and 15, as shown in Table 3, the percentages of the first phosphorescent 71 with respect to the total phosphorescent contents were, respectively, in a range of 55 wt.% to 80 wt.%, and the ratio of the first phosphorescent contents. phosphorescent substance 71 with respect to the content of the third phosphorescent substance 73 was, respectively, in a range of 2.4 to 5.5. As shown in Table 4, examples 10, 11, 12, 13, 14, and 15 show, respectively, R12 of 90 or greater, and also Rt of 660 or greater, indicating particularly good color rendering properties.

Figure 4 shows emission spectra of light-emitting devices according to Comparative Example 2 and examples 8 to 11, and Figure 5 shows emission spectra of light-emitting devices according to Comparative Example 2 and examples 12 to 15, the emission spectra being normalized to the emission intensity at 530 nm of a 5,000K reference light source. The emission spectra shown in figure 4 and figure 5 show, respectively, the intensity and relative light versus wavelength. In examples 10,11, 12,13,14, and 15, as shown in Table 3, the peak emission intensity ratios of the first phosphorescent 71 with respect to the light emitting element 10 in the emission spectra are, respectively. , in a range of 0.6 to 1.5. As shown in Table 4, examples 10, 11, 12, 13, 14, and 15 show, respectively, R12 of 90 or greater, and also Rt of 660 or greater, indicating particularly good color rendering properties. EXAMPLES 16 to 23 Examples 16 to 23 of light emitting device 100 were produced in a similar manner as in Example 1, except that the phosphorescent substance levels were adjusted to meet the percentages shown in Table 5 to adjust the color temperature correlated by about 4,000K. COMPARATIVE EXAMPLE 3 Comparative Example 3 of Light Emitting Device 100 was produced in a similar manner as in Example 1, except that the first phosphorescent substance 71 (CCA) was not used and a combination of the second phosphorescent substance 72 ( SAE), third phosphor 73 (YAG), fourth phosphor 74 (SCASN), and fifth phosphor 75 (MGF) were used as phosphor 70, and the correlated color temperature was adjusted by about 4,000. K.

Examples 16 through 23, and Comparative Example 3 of the light emitting device 100 were evaluated and the evaluation results except for the color rendering indices were shown in Table 5, the results of the color rendering indices were shown in Table 6. TABLE 5 As seen from tables 5 and 6, examples 16 to 23 containing the first phosphorescent 71 show Ra values greater than Comparative Example 3 which does not contain the first phosphorescent 71. In addition, examples 16 through 23 show values of 60 or greater for all indices from R 9 to R 15. On the other hand, Comparative Example 3 which does not contain the first phosphorescent substance 71 shows Ra lower than any examples and R12 of 44 which is much smaller than the Examples.

As shown in Table 5, the correlated color temperatures of Examples 16 to 23, and Comparative Example 3 are all in a range of 3,500 K to 4,500 K. In Examples 19, 20, 21, and 22, as shown in Table 5, the percentages of the first phosphorescent 71 with respect to the total phosphorescent contents were, respectively, in a range of 55 wt.% To 70 wt.%, And the ratio of contents of the first phosphorescent 71 with respect to content of the third phosphor 73 was, respectively, in a range of 2.4 to 3.8. As seen from Table 6, examples 19, 20, 21, and 22 respectively show R12 of 90 or greater, and also Rt of 670 or greater, indicating particularly good color rendering properties.

Figure 6 shows emission spectra of light-emitting devices according to Comparative Example 3 and examples 16 to 19, and Figure 7 shows emission spectra of light-emitting devices according to Comparative Example 3 and examples 20 to 23, the emission spectra being normalized to the emission intensity at 530 nm of a 4,000K reference light source. The emission spectra shown in figure 6 and figure 7 show, respectively, relative emission intensity versus wavelength. In examples 19, 20, and 21, as shown in Table 5, the peak emission intensity ratios of the first phosphorescent 71 with respect to the light emitting element 10 in the emission spectra are, respectively, in a range of 0 , 8 to 1.1. As seen from Table 6, examples 19, 20, and 21, respectively, show R12 of 97 or greater, and also Rt of 680 or greater, indicating particularly good color rendering properties. EXAMPLE 24 Example 24 of light-emitting device 100 was produced in a similar manner as in Example 1, except that the phosphorescent content levels were adjusted to meet the content ratios shown in Table 7 to adjust the temperature. correlated color at about 3000K. COMPARATIVE EXAMPLE 4 Comparative example 4 of light emitting device 100 was produced in a similar manner as in Example 1, except that the first phosphorescent substance 71 (CCA) was not used and a combination of the second phosphorescent substance 72 ( SAE), third phosphor 73 (YAG), fourth phosphor 74 (SCASN), and fifth phosphor 75 (MGF) were used as phosphor 70, and the correlated color temperature was adjusted by about 3,000. K. EXAMPLE 25 Example 25 of light emitting device 100 was produced in a similar manner as in Example 1, except that the phosphorescent substance levels were adjusted to meet the content ratios shown in Table 7 to adjust the temperature of correlated color at about 2,700K. COMPARATIVE EXAMPLE 5 Comparative Example 5 of light emitting device 100 was produced in a similar manner as in Example 1, except that the first phosphor 71 (CCA) was not used and a combination of the second phosphor 72 ( SAE), third phosphor 73 (YAG), fourth phosphor 74 (SCASN), and fifth phosphor 75 (MGF) were used as phosphor 70, and the correlated color temperature was adjusted by about 2,700. K.

Examples 24 and 25, and comparative examples 4 and 5 of the light emitting device 100 were evaluated and the results of the evaluation except for the color rendering indices were shown in Table 7, the results of the rendering indices of Table 7 As seen from tables 7 and 8, examples 24 and 25 containing the first phosphorescent 71 show higher Ra values than comparative examples 4 and 5 not containing the first phosphorescent substance 71. In addition, examples 24 and 25 show values of 90 or greater for all indices from R9 to R15. On the other hand, Comparative Example 4 which does not contain the first phosphorescent substance 71 shows Ra lower than Example 24 and R12 of 51 which is much smaller than Example 24. On the other hand, Comparative Example 5 which does not contain the first phosphorescent substance 71 shows Ra less than Example 25 and R12 of 59 which is much smaller than Example 25.

As shown in Table 7, the correlated color temperatures of Examples 24 and 25, and Comparative Examples 4 and 5 are all in a range of 2,000 K to 3,500 K. In Examples 24 and 25, as shown in Table 7, the percentage contents of the first phosphorescent 71 with respect to the total content of the phosphorescent were in the range of 40% by mass to 55% by weight respectively and the content ratio of the first phosphorescent 71 with respect to the content of the third phosphorescent phosphorescent substance 73 were, respectively, in a range of 1.9 to 2.5. As seen from Table 8, examples 24 and 25 show, respectively, R12 of 90 or greater, and also Rt of 680 or greater, indicating larger color rendering properties than comparative examples 4 and 5.

Figure 8 shows emission spectra of light-emitting devices according to Comparative Example 4 and Example 24, and Figure 9 shows emission spectra of light-emitting devices according to Comparative Example 5 and Example 25, the emission spectra being normalized to the 530 nm emission intensity of a reference light source. The emission spectra shown in figures 8 and 9 show, respectively, relative emission intensity versus wavelength. In examples 24 and 25, as shown in Table 8, the peak ratio emission intensity in the emission spectra of the first phosphorescent 71 with respect to the light emitting element 10 is in a range of 0.8 to 1.1. respectively. In examples 24 and 25, as shown in Table 8, R12 values are 90 or greater, while Rt values are 680 or greater, which indicates higher color rendering properties than in comparative examples 4 and 5.

Light emitting devices according to certain embodiments may be used for good emission lighting devices having a blue light emitting diode or ultraviolet light emitting diode excitation light source for monitors LED, camera flash device, liquid crystal display light source, or the like. In particular, light-emitting devices according to certain embodiments may be suitably used for lighting devices and light sources that are required with high color rendering properties.

It should be understood that while the present invention has been described with respect to preferred embodiments thereof, various other embodiments and variants may occur to those skilled in the art, which are within the scope and spirit of the invention, and such other embodiments and variants. are intended to be covered by the following claims.

Although the present disclosure has been described with reference to various exemplary embodiments, it should be understood that the words that have been used are words of description and illustration rather than words of limitation. Exchanges may be made within the scope of the appended claims, as presently stated and as amended, without departing from the scope of disclosure in its aspects. Although the disclosure has been described with reference to particular examples, means and embodiments, the disclosure may not be intended to be limited to the particular disclosed, preferably the disclosure extends to all equivalent structures of functionality, methods and uses as they are within. scope of the appended claims.

One or more examples or embodiments of the disclosure may be referred to herein, individually and / or collectively, by the term "disclosure" merely for convenience and without intending to voluntarily limit the scope of this application to any particular disclosure or inventive concept. Furthermore, while specific examples and embodiments have been illustrated and described herein, it should be appreciated that any subsequent arrangement designed to achieve the same or similar purpose may be substituted for the specific examples or embodiments shown. This disclosure may be intended to cover any and all subsequent adaptations or variations of various examples and embodiments. The combinations of the above examples and embodiments, and other examples and embodiments not specifically described herein, will be apparent to those skilled in the art upon reviewing the description.

Further, in the Detailed Description above, various aspects may be grouped together or described in a single embodiment for purposes of expediting disclosure. This disclosure cannot be interpreted as reflecting an intention that the claimed embodiments need more aspects than are expressly described in each claim. Preferably, as the following claims reflect, the subject matter of the invention may be directed to less than all aspects of any of the disclosed embodiments. Thus, the following claims are incorporated into the Detailed Description, with each claim remaining by itself as defining the claimed subject matter separately.

The subject matter disclosed above will be considered illustrative, not restrictive, and the appended claims are intended to cover all such modifications, improvements, and other embodiments that are within the spirit and scope of the present disclosure. Thus, to the fullest extent permitted by law, the scope of this disclosure may be determined by the broader permissible interpretation of the following claims and their equivalents, and will not be restricted or limited by the detailed description above.

All publications, patent applications, and technical fields mentioned in this report are incorporated herein by reference to the same extent as if each individual publication, patent application, or technical standard was specifically and individually indicated to be incorporated by reference. .

Claims (21)

Light-emitting device, characterized in that it comprises: a light-emitting element having a peak emission wavelength in a range from 410 nm to 440nm; and a phosphorescent member, the phosphorescent member containing a phosphorescent substance comprising: a first phosphorescent substance having a peak emission wavelength in the range of 430 nm to 500 nm and containing an alkaline earth phosphate including Cl and is activated with Me; a second phosphorescent substance having a peak emission wavelength in the range of 440 nm to 550 nm and containing at least one of an alkaline earth aluminate, which is activated with Eu, and a silicate, which includes Ca, Mg, and Cl e is activated with Me; a third phosphorescent substance having a peak emission wavelength in the range of 500 nm to 600 nm and containing a rare earth aluminate which is activated with Ce; a fourth phosphorescent substance having a peak emission wavelength in the range of 610 nm to 650 nm and containing a silicon nitride, which includes Al and at least one of Sr and Ca and is activated with Eu; and a fifth phosphorescent substance having a peak emission wavelength in the range 650 nm to 670 nm and containing a fluorogermanate, which is activated with Mn. Light-emitting device according to Claim 1, characterized in that a percentage content of the first phosphorescent substance to a total content of the phosphorescent substance is in a range from 20 mass% to 80 mass%. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light of correlated color temperature in a range of 5,500 K to 7,500 K, and an optical intensity ratio of The peak of the first phosphorescent substance for the light-emitting element is in the range 0.4 to 1.5. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light of correlated color temperature in a range of 4,500 K to 5,500 K, and an optical intensity ratio of peak of the first phosphorescent substance for the light emitting element to be in the range 0.4 to 1.5. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light of correlated color temperature in a range of 3,500 K to 4,500 K, and an optical intensity ratio of peak of the first phosphorescent substance for the light emitting element to be in a range of 0.3 to 1.3. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light of correlated color temperature in a range of 2,500 K to 3,500 K, and an optical intensity ratio of peak of the first phosphorescent substance for the light emitting element to be in the range 0.2 to 1.4. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light of correlated color temperature in a range of 5,500 K to 7,500 K, and a percentage content of the first substance. phosphorescent with respect to a total phosphorescent content being in a range from 30 mass% to 80 mass%. Light-emitting device according to Claim 7, characterized in that the content ratio of the first phosphorescent substance with respect to the third phosphorescent substance is in the range 0.9 to 6. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light of correlated color temperature in a range of 4,500 K to less than 5,500 K, and a percentage content. of the first phosphorescent with respect to a total phosphorescent content being in the range of 30 mass% to 80 mass%. Light-emitting device according to Claim 9, characterized in that the content ratio of the first phosphorescent substance with respect to the third phosphorescent substance is in the range 0.8 to 5.5. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light of correlated color temperature in a range of 3,500 K to less than 4,500 K, and a percentage content. of the first phosphorescent with respect to a total phosphorescent content being in the range of 20% by mass to 75% by mass. Light-emitting device according to Claim 11, characterized in that the content ratio of the first phosphorescent substance with respect to the third phosphorescent substance is in a range of 0.6 to 4.2. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light of correlated color temperature in a range from 2,500 K to less than 3,500 K, and a percentage content of first phosphorescent with respect to a total phosphorescent content being in a range from 40 mass% to 55 mass%. Light-emitting device according to Claim 13, characterized in that the content ratio of the first phosphorescent substance with respect to the third phosphorescent substance is in a range from 1.9 to 2.5. Light-emitting device according to Claim 1, characterized in that the alkaline earth phosphate has a composition represented by the formula (1): (Ca, Sr, Ba) 5 (P04) 3 (CI, Br): Eu (1) Light-emitting device according to Claim 1, characterized in that the alkaline earth aluminate has a composition represented by the formula (2a) and the silicate has a composition represented by the formula (2b): (Sr, Ca, Ba) 4AI14025: Me (2a) (Ca, Sr, Ba) 8MgSi40i6 (F, Cl, Br) 2: Me (2b) Light-emitting device according to Claim 1, characterized in that the rare earth aluminate has a composition represented by the formula (3): (Y, Lu, Gd) 3 (AI, Ga) 5012: Ce (3 ) Light-emitting device according to Claim 1, characterized in that the silicon nitride has a composition represented by the formula (4): (Sr, Ca) AISiN3: Eu (4) Light-emitting device according to Claim 1, characterized in that the fluorogermanate has a composition represented by formula (5a) or formula (5b): 3,5MgO0,5MgF2GeO2: Mn (5a) (χ-5) Μ9θ · (8/2) 8θ2θ3'γΜ9Ρ2'θθ3Ρ2 '(14) Οβθ2' (ί / 2) ΜΙ2θ3: ζΜη (5b) where M1 is at least one selected from the group consisting of Al, Ga, and In, eg, y, z, s, t, i, respectively, satisfy 2 ^ x ^ 4, 0 <y <1.5, 0 <z <0.05, 0 ^ s <0.5, 0 <t <0.5 , and 0 ^ u <1.5. Light-emitting device according to Claim 1, characterized in that the light-emitting device is configured to emit light with a special color rendering index R12 of 60 or greater. Light emitting device according to claim 1, characterized in that the light emitting device is configured to emit light with a sum of the special color rendering indices R9 to R15 of 600 or greater.