Light emitting device, luminaire, and street lamp

Abstract

Provided are a light-emitting device, a luminaire, and a streetlight having a lower insect-attracting effect. The light-emitting device includes a light-emitting element having a peak emission wavelength in a range of 400 nm or more and 490 nm or less, and a first phosphor having a peak emission wavelength in a range of 570 nm or more and 680 nm or less. The correlated color temperature of the light-emitting device is 1950 K or less, the average color rendering index Ra is 51 or more, the full width at half maximum of the peak emission having the largest emission intensity in the emission spectrum of the light-emitting device is 110 nm or less, and the light-emitting device emits light having an insect-attracting index I of 0.031 or less. The insect-attracting index I is a ratio of the effective radiant luminance of the light-emitting device in a range of 250 nm or more and 615 nm or less, which takes into account the spectral luminous efficiency of insects, to the luminance of light emitted by the light-emitting device in a range of 380 nm or more and 780 nm or less, which takes into account the relative luminous efficiency of the human photopic standard specified by CIE (International Commission on Illumination).

Description

Technical Field

[0001] This invention relates to light-emitting devices, lamps, and streetlights. Background Technology

[0002] For outdoor lighting fixtures such as streetlights and road lights, HID lamps, including high-pressure mercury lamps, metal halide lamps, and high-pressure sodium lamps, are frequently used due to their longer lifespan and higher efficiency compared to incandescent bulbs. These lamps use mercury as the luminescent material, and with the restrictions imposed by the Minamata Convention (which deals with mercury), there is a growing demand for alternatives using safer luminescent materials.

[0003] Outdoor lighting fixtures such as streetlights and road lights are also expected to have reduced insect-attracting effects. Besides streetlights and road lights, outdoor lighting fixtures such as headlamps, flashlights, or portable lanterns using LEDs, as well as indoor lighting fixtures used near entrances, windows, and other locations close to the outdoors, are also expected to have reduced insect-attracting effects. Many insects are attracted to light. Insect attraction to light is based on their positive phototaxis, an action caused by their light visibility (spectral luminous efficiency). In instruction manuals, the effect of attracting insects is sometimes referred to as the "insect-attracting effect." Additionally, the effect of reducing the insect-attracting effect is sometimes referred to as the "low insect-attracting effect." Generally, insects have two spectral sensitivities, with a wavelength range of approximately 400 nm as the boundary: one in the wavelength region of approximately 200 nm to approximately 400 nm, and the other in the wavelength region of approximately 400 nm to approximately 600 nm. To control the energy intensity in the wavelength region of the spectral light efficiency of such insects, light-emitting devices equipped with optical multilayer films, color filters, and wavelength cutoff filters that control the transmission of light in a specified wavelength region have been proposed. For example, patent documents 1 and 2 disclose light-emitting devices equipped with optical multilayer films that control the energy intensity in the wavelength region of the spectral light efficiency of insects.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-26046

[0007] Patent Document 2: Japanese Patent Application Publication No. 2013-127928 Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] Optical multilayer films are angle-dependent in order to induce light interference at the interfaces of layers with different refractive indices. For example, the transmission of light in a specified wavelength range is poor relative to the spectral distribution of light incident obliquely on the optical multilayer film, sometimes failing to achieve a sufficiently low insect-attracting effect.

[0010] One aspect of this invention aims to provide a light-emitting device, lamp, and street light with low insect-attracting effect.

[0011] Technical solutions for solving technical problems

[0012] The first embodiment is a light-emitting device comprising: a light-emitting element having a peak emission wavelength in the range of 400 nm to 490 nm; a first phosphor having a peak emission wavelength in the range of 570 nm to 680 nm; the correlated color temperature of the light-emitting device being 1950 K or less, the average color rendering index Ra being 51 or more, the full width at half maximum (FWHM) of the emission peak having the maximum emission intensity in the emission spectrum being 110 nm or less, emitting light with an insect attraction index I of 0.031 or less, wherein the insect attraction index I is 250 nm to 615 nm. The effective radiant brightness of the light-emitting device, taking into account the spectral luminous efficiency of insects, is relative to the brightness of light emitted by the light-emitting device in the range of 380 nm to 780 nm, taking into account the relative luminous luminous efficiency of human visual standards as defined by the CIE (International Commission on Illumination), and is derived from the following formula (1).

[0013]

[0014] (In equation (1), S(λ) is the spectral radiance of the light emitted by the light-emitting device, V(λ) is the relative luminous visibility curve of human standard of sight as specified by CIE (International Commission on Illumination), and R(λ) is the spectral luminous efficiency of the insect.)

[0015] The second embodiment is a light-emitting device comprising: a light-emitting element having a peak emission wavelength in the range of 400 nm to 490 nm; a first phosphor having a peak emission wavelength in the range of 570 nm to 680 nm, the first phosphor comprising a first nitride phosphor having a composition represented by the following formula (1A), the correlated color temperature of the light-emitting device being 1950 K or less, the full width at half maximum (FWHM) of the emission peak having the maximum emission intensity in the emission spectrum being 110 nm or less, emitting light with an insect attraction index I of 0.031 or less, the insect attraction index I being the ratio of the effective radiant brightness of the light-emitting device, taking into account the spectral luminous efficiency of insects, to the brightness of light emitted by the light-emitting device in the range of 380 nm to 780 nm, taking into account the relative luminous luminous efficiency of human visual standards as defined by the CIE (International Commission on Illumination), derived from the above formula (1).

[0016] M 1 2Si5N8:Eu(1A)

[0017] (In formula (1A), M) 1 It is an alkaline earth metal element containing at least one selected from Ca, Sr, and Ba.

[0018] The third option is a lamp equipped with the aforementioned light-emitting device.

[0019] The fourth option is a street light equipped with the aforementioned light-emitting device.

[0020] Invention Effects

[0021] According to one aspect of the present invention, it is possible to provide a light-emitting device, lamp, and street light with low insect-attracting effect. Attached Figure Description

[0022] Figure 1A It is a diagram representing the CIE 1931 chromaticity diagram, showing the spectral locus and the blackbody radiation locus (Duv = 0.000) within the pure violet locus in the CIE 1931 chromaticity diagram, and the color deviation relative to the blackbody radiation locus.

[0023] Figure 1B It means Figure 1A A magnified view of the blackbody radiation trajectory (Duv = 0.000) in the CIE 1931 chromaticity diagram, showing the range of x-values ​​above 0.300 and below 0.600 and y-values ​​above 0.250 and below 0.500, and the color deviations relative to the blackbody radiation trajectory at various correlated color temperatures (Duv: -0.020, -0.010, -0.008, +0.008, +0.010, +0.020).

[0024] Figure 2 This is a schematic cross-sectional view showing an example of the light-emitting device of the first configuration example.

[0025] Figure 3 This is a schematic cross-sectional view showing an example of the light-emitting device of the first configuration example.

[0026] Figure 4 This is a schematic perspective view showing an example of the light-emitting device of the second configuration example.

[0027] Figure 5 This is a schematic cross-sectional view showing an example of a light-emitting device in the second configuration example.

[0028] Figure 6 This is a diagram showing an example of a street lamp.

[0029] Figure 7 This is a graph showing the spectral radiance of the light-emitting device of Example 1, the light-emitting devices of Comparative Example 1 and Comparative Example 3, the light visibility of insects (spectral luminous efficiency), and the light visibility of humans (relative luminous visibility curve of the standard of clear vision).

[0030] Figure 8 The graph shows the spectral radiance of the light-emitting devices of Examples 2 and 3, the light-emitting device of Comparative Example 3, the light visibility of insects (spectral luminous efficiency), and the light visibility of humans (relative luminous visibility curve of the standard of clear vision).

[0031] Figure 9 The graph shows the spectral radiance of the light-emitting devices of Examples 4 and 5, the light-emitting device of Comparative Example 3, the light visibility of insects (spectral luminous efficiency), and the light visibility of humans (relative luminous visibility curve of the standard of clear vision).

[0032] Figure 10 The graph shows the spectral radiance of the light-emitting devices of Examples 6 and 7, the light-emitting device of Comparative Example 3, the light visibility of insects (spectral luminous efficiency), and the light visibility of humans (relative luminous visibility curve of the standard of clear vision).

[0033] Figure 11 This is a graph showing the spectral radiance of the light-emitting devices of Comparative Examples 1, 2 and 3, the light visibility of insects (spectral luminous efficiency), and the light visibility of humans (relative light visibility curve of the standard of photopic vision). Detailed Implementation

[0034] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. However, the embodiments shown below are illustrative examples used to concretize the technical concept of the present invention, and the present invention is not limited to the light-emitting devices, lamps, and streetlights described below. Furthermore, the components shown in the claims are not intended to be limited to the components of the embodiments. In particular, the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments are not intended to limit the scope of the present invention unless specifically stated otherwise, and are merely illustrative examples. It should be noted that the relationship between color names and chromaticity coordinates, the relationship between the wavelength range of light and the color names of monochromatic light, etc., follow JIS Z8110. In this specification, the content of each component in the composition, when multiple substances conforming to each component exist in the composition, means the total amount of those multiple substances present in the composition unless otherwise specified. Full width at half maximum (FWHM) means the wavelength width of the emission peak representing 50% of the maximum emission intensity in the emission spectrum.

[0035] The first embodiment of the light-emitting device includes a light-emitting element having a peak emission wavelength in the range of 400 nm to 490 nm and a first phosphor having a peak emission wavelength in the range of 570 nm to 680 nm. The correlated color temperature (CCT) of the light-emitting device is 1950 K or less, the average color rendering index Ra is 51 or more, and the full width at half maximum (FWHM) of the emission peak with the maximum luminous intensity in the emission spectrum of the light-emitting device is 110 nm or less. In addition, the effective radiant brightness of the light-emitting device, which emits light with an insect attraction index I of 0.031 or less and an insect attraction index I of 250 nm to 615 nm, taking into account the spectral luminous efficiency of insects, is relative to the brightness of the light emitted by the light-emitting device in the range of 380 nm to 780 nm, taking into account the relative luminous brightness of human visual standards as defined by the CIE (International Commission on Illumination), is derived from the following formula (1).

[0036]

[0037] (In equation (1), S(λ) is the spectral radiance of the light emitted by the light-emitting device, V(λ) is the relative luminous visibility curve of human standard of sight as specified by CIE (International Commission on Illumination), and R(λ) is the spectral luminous efficiency of the insect.)

[0038] The second embodiment of the light-emitting device includes a light-emitting element having a peak emission wavelength in the range of 400 nm to 490 nm and a first phosphor having a peak emission wavelength in the range of 570 nm to 680 nm. The first phosphor comprises a first nitride phosphor having a composition represented by formula (1A) described later, a correlated color temperature of 1950 K or less, and a full width at half maximum (FWHM) of the emission peak having the maximum emission intensity in the emission spectrum of the light-emitting device of 110 nm or less. In addition, the effective radiant brightness of the light-emitting device, which emits light with an insect attraction index I of 0.031 or less and an insect attraction index I of 250 nm to 615 nm, taking into account the spectral luminous efficiency of insects, is relative to the brightness of light emitted by the light-emitting device in the range of 380 nm to 780 nm, taking into account the relative luminous brightness of human visual standards as defined by the CIE (International Commission on Illumination), and is derived from the above formula (1).

[0039]

[0040] (In equation (1), S(λ) is the spectral radiance of the light emitted by the light-emitting device, V(λ) is the relative luminous visibility curve of human standard of sight as specified by CIE (International Commission on Illumination), and R(λ) is the spectral luminous efficiency of the insect.)

[0041] High-pressure sodium lamps, used as light sources for outdoor lighting fixtures such as streetlights and road lights, have a correlated color temperature of approximately 2000K–2500K under simulated conditions, emitting light with a high proportion of yellow or orange components. If the mixed light contains more blue and / or green components, the overlap with the spectral efficiency of insects exhibiting positive phototaxis increases, making it easier to attract insects and thus increasing its insect-attracting effect. Examples of insects that can be categorized include winged insects (Pterygota) and wingless insects (Pteranodon). Examples of winged insects include Hemiptera (such as the black-tailed leafhopper) and Lepidoptera (such as butterflies and moths).

[0042] The light-emitting device emits light with a correlated color temperature of 1950K or lower. The light-emitting device emits light with a correlated color temperature that is, for example, similar to or slightly lower than that emitted by a high-pressure sodium lamp. If the correlated color temperature of the light emitted by the light-emitting device is 1950K or lower, then even when the light-emitting device is used as the light source for streetlights or road lighting fixtures that use high-pressure sodium lamps as the light source, it emits light that does not feel unnatural to humans. The correlated color temperature of the light emitted by the light-emitting device can also be 1920K or lower, or even 1900K or lower. For the light emitted by the light-emitting device to not feel unnatural to humans, for example, when it is emitted from a light-emitting device used outdoors or even indoors in a location close to the outdoors, the correlated color temperature is preferably 1000K or higher, or even 1200K or higher, or even 1500K or higher, or even 1700K or higher.

[0043] The average color rendering index (CRI) Ra of the light emitted by the light-emitting device can be 5 or higher, or it can be 10 or higher, or it can be 20 or higher, or it can be 30 or higher, or it can be 40 or higher, preferably 51 or higher, and more preferably 62 or higher. The average CRI of the light emitted by the light-emitting device can be measured in accordance with JIS Z8726. The closer the average CRI Ra value of the light emitted by the light-emitting device is to 100, the more similar it is to the color rendering of a reference light source. Color rendering indicates the degree of visual effect on the illuminated object. Outdoor lighting fixtures such as streetlights and road lighting lamps emit light with an average CRI Ra of 5 or higher.

[0044] The specific color rendering index (CRI) R9 of light emitted by a light-emitting device is an indicator for evaluating the red color. For light-emitting devices used in streetlights, road lighting, and other outdoor installations, or even indoor installations located close to the outdoors, the necessity for confirming the red color is often low. The specific CRI R9 of light emitted by a light-emitting device can also be negative. The specific CRI R9 of light emitted by a light-emitting device can be in the range of -150 to +99, -140 to +98, or -135 to +95.

[0045] In a light-emitting device, the full width at half maximum (FWHM) of the emission peak with the highest luminous intensity in its emission spectrum is typically 110 nm or less, but can also be 100 nm or less, 95 nm or less, 90 nm or less, or greater than 3 nm, 40 nm or greater, 60 nm or greater, or 70 nm or greater. If the FWHM of the emission peak with the highest luminous intensity in the emission spectrum is large, there is a tendency for an increase in the component of light on the longer wavelength side (which is difficult for humans to perceive) or the component of light on the shorter wavelength side (which is easily perceived by insects). If the component of light on the longer wavelength side increases, there is a tendency for the brightness of the light emitted from the light-emitting device to decrease. If the component of light on the shorter wavelength side increases, there is a tendency for an increase in the likelihood of insects being attracted. Conversely, if the FWHM of the emission peak with the highest luminous intensity in the emission spectrum is small, there is a tendency for a greater component of light within a specific wavelength range. When the emission peak with the highest emission intensity in the emission spectrum of a light-emitting device is located on the short-wavelength side, the emission from the short-wavelength side, where the effect of attracting insects is greatest, is not suppressed, making it difficult to reduce the insect-attracting effect. Furthermore, if the emission peak with the highest emission intensity in the emission spectrum of a light-emitting device is located on the long-wavelength side, and the component of light on the long-wavelength side, which is difficult for humans to perceive, becomes larger, it becomes difficult to suppress the decrease in brightness. For example, in order to provide a light-emitting device that emits highly efficient light with a low insect-attracting effect, as required for light-emitting devices used outdoors or even indoors in locations close to the outdoors, the full width at half maximum (FWHM) of the emission peak with the highest emission intensity in the emission spectrum of the light-emitting device is preferably 110 nm or less.

[0046] The full width at half maximum (FWHM) of the emission peak with the highest luminous intensity in the emission spectrum of a light-emitting device is sometimes narrower than the FWHM of the emission peak at the emission peak wavelength of the first phosphor or the second phosphor. For example, when a first phosphor and a second phosphor are provided with emission peak wavelengths in different wavelength ranges, the luminous intensity varies in the overlapping portion of the emission spectra of the first phosphor and the second phosphor. As a result, the emission spectrum of the mixed light emitted from the light-emitting device differs from the emission spectrum of the first phosphor or the second phosphor, and is sometimes narrower than the FWHM of the emission peak at the emission peak wavelength of the first phosphor or the second phosphor.

[0047] The emission peak wavelength with the highest luminous intensity in the emission spectrum of the light-emitting device is preferably in the range of 570 nm to 680 nm, or it can be in the range of 575 nm to 680 nm, or it can be in the range of 575 nm to 670 nm. The range of the emission peak wavelength with the highest luminous intensity in the emission spectrum of the light-emitting device may also overlap with the range of the emission peak wavelength of the first phosphor. The emission peak with the highest luminous intensity in the emission spectrum of the light-emitting device may also be caused by the emission of the first phosphor.

[0048] The light-emitting device emits light with an insect-attracting index I of 0.031 or less derived from equation (1). The insect-attracting index I is the ratio of the effective radiant luminance Li of the light-emitting device (considering the spectral luminous efficiency of insects, Bickford data, hereinafter also referred to as "Bickford") in the range of 250 nm to 615 nm to the luminance L of the light-emitting device in the range of 380 nm to 780 nm, considering the relative luminous luminance of human visual standards as defined by the CIE. The insect-attracting index I represents the ratio of the effective radiant luminance of the light-emitting device acting on the positive phototaxis of insects to the luminance of the light emitted by the light-emitting device. The smaller the value of the insect-attracting index I, the more the positive phototaxis of insects is suppressed relative to the luminance of the light emitted by the light-emitting device.

[0049] The light-emitting device possesses a light-emitting element with a peak emission wavelength in the range of 400 nm to 490 nm. Even when light containing the blue component emitted from the light-emitting element is included, the insect attraction index I is below 0.031, resulting in a lower insect-attracting effect. By emitting light with an insect attraction index I below 0.031, the light-emitting device reduces the spectral radiance in the wavelength range of 400 nm to 615 nm, which overlaps with the spectral luminous efficiency of insects, especially in the wavelength range of 400 nm to 550 nm, thus emitting light with a lower insect-attracting effect. By reducing the spectral radiance in the wavelength range above 400 nm and below 550 nm, light with a low insect-attracting effect is emitted from the light-emitting device. By suppressing the reduction in spectral radiance in the range of 550 nm to 600 nm, light with suppressed brightness reduction is emitted from the light-emitting device. As long as the insect-attracting index I of the light emitted by the light-emitting device is below 0.031, it has a sufficient low insect-attracting effect. However, the insect-attracting index I can also be below 0.028 or even below 0.025. If the spectral luminous efficiency of insects is taken into account, the light-emitting device can emit light with an insect-attracting index I of 0.001 or higher, or light with an insect-attracting index I of 0.005 or higher, or light with an insect-attracting index I of 0.012 or higher.

[0050] The luminance L of a light-emitting device in the range of 380 nm to 780 nm is derived from the following equation (2). The luminance L of the light-emitting device is the integral of the spectral radiance S(λ) of the light-emitting device in the range of 380 nm to 780 nm and the relative luminous visibility curve V(λ) of human visual standard as specified by CIE.

[0051]

[0052] The effective radiance Li of a light-emitting device considering the spectral luminous efficiency of insects in the range of 250 nm to 615 nm is derived by the following equation (3). The effective radiance Li of a light-emitting device considering the spectral luminous efficiency of insects is the integral value of the spectral radiance S(λ) of the light-emitting device in the range of 250 nm to 615 nm and the spectral luminous efficiency (Bickford) R(λ) of insects.

[0053]

[0054] The insect attraction index I derived from Equation (1) is the ratio of the effective radiant brightness Li of the light-emitting device derived from Equation (3) to the brightness L of the light-emitting device in the range of 380 nm and below derived from Equation (2) (I = Li / L).

[0055] Light-emitting element

[0056] The light-emitting element has a peak emission wavelength in the range of 400 nm to 490 nm. To achieve a correlated color temperature that does not appear unnatural when illuminating outdoor environments, to meet the color rendering requirements for outdoor illumination, and to emit light with lower insect-attracting effects, the peak emission wavelength of the light-emitting element is preferably in the range of 420 nm to 480 nm, and may further be in the range of 440 nm to 460 nm. At least a portion of the light emitted by the light-emitting element is utilized as excitation light for a first phosphor, and in the case of a second phosphor, it is utilized as excitation light for the second phosphor. Additionally, a portion of the light emitted by the light-emitting element is utilized as light emitted from the light-emitting device. The full width at half maximum (FWHM) of the emission peak with the peak emission wavelength in the emission spectrum of the light-emitting element is preferably 30 nm or less, more preferably 25 nm or less, and even more preferably 20 nm or less. For example, a semiconductor light-emitting element utilizing a nitride-based semiconductor is preferably used. This results in a stable light-emitting device with high efficiency, high linearity of output relative to input, and resistance to mechanical shock. The light-emitting element is provided with a p-electrode and an n-electrode. The p-electrode and n-electrode of the light-emitting element can be formed on the same side of the light-emitting element, or they can be disposed on different sides of the light-emitting element.

[0057] First fluorescent

[0058] The light-emitting device includes a first phosphor having a peak emission wavelength in the range of 570 nm to 680 nm. The first phosphor is excited by the emission of a light-emitting element having a peak emission wavelength in the range of 400 nm to 490 nm, emitting light with a peak emission wavelength in the range of 570 nm to 680 nm. The first phosphor may also have a peak emission wavelength in the range of 575 nm to 670 nm, or in the range of 580 nm to 660 nm. Regarding the first phosphor, the full width at half maximum (FWHM) of the emission peak in the emission spectrum of the first phosphor is preferably in the range of 3 nm to 120 nm. The full WHM of the emission peak in the emission spectrum of the first phosphor is preferably in the range of 3 nm to 15 nm, or in the range of 60 nm to 120 nm. In order to have a correlated color temperature that does not feel out of place as a light-emitting device used outdoors or even indoors in places close to the outdoors, to meet the color rendering requirements for light-emitting devices used outdoors or even indoors in places close to the outdoors, and to emit light with low insect-attracting effect, the full width at half maximum (FWHM) of the emission peak with the emission peak wavelength in the emission spectrum of the first phosphor is preferably within the range described above.

[0059] In order to obtain the above-mentioned emission spectrum, the first phosphor preferably includes at least one selected from a first nitride phosphor having a composition represented by the following formula (1A), a second nitride phosphor having a composition represented by the following formula (1B), a fluoride phosphor represented by the following formula (1C), and a fluoride phosphor with a composition different from that of the following formula (1C) and represented by the following formula (1C').

[0060] M 1 2Si5N8:Eu (1A)

[0061] (In formula (1A), M) 1 It is an alkaline earth metal element containing at least one selected from Ca, Sr, and Ba.

[0062] Sr q Ca s Al t Si u N v Eu (1B)

[0063] (In equation (1B), q, s, t, u, and v satisfy 0 ≤ q < 1, 0 < s ≤ 1, q + s ≤ 1, 0.9 ≤ t ≤ 1.1, 0.9 ≤ u ≤ 1.1, and 2.5 ≤ v ≤ 3.5, respectively.)

[0064] Ac [M 2 1-b Mn 4+ b F d (1C)

[0065] (In equation (1C), A contains elements selected from K) + Li + Na + 、Rb + Cs + and NH4 + At least one of them, wherein K + Preferred. M 2 It contains at least one element selected from Group 4 and Group 14 elements, with Si and Ge being preferred. b satisfies 0 < b < 0.2, and c is [M... 2 1-b Mn 4+ b F d The absolute value of the charge of an ion, d, satisfies 5 < d < 7.

[0066] A' c’ [M 2 ' 1-b’ Mn 4+ b’ F d’ ] (1C')

[0067] (In formula (1C'), A' contains elements selected from K) + Li + Na + 、Rb + Cs + and NH4 + At least one of them, wherein K + Preferred. M 2 It contains at least one element selected from Group 4, Group 13, and Group 14 elements, with Si and Al being preferred. b' satisfies 0 < b' < 0.2, and c' is [M 2 ' 1-b’ Mn 4+ b’ F d’ The absolute value of the charge of an ion, d', satisfies 5 < d' < 7.

[0068] In this specification, in the formula representing the composition of the phosphor, the part before the colon (:) indicates the molar ratio of each element in 1 mole of the parent crystal and the phosphor, and the part after the colon (:) indicates the activating element.

[0069] The first phosphor may also comprise at least one phosphor selected from fluorogermanate phosphors, fourth nitride phosphors, and first sulfide phosphors. A fluorogermanate phosphor, for example, has a composition represented by formula (1D). A fourth nitride phosphor, for example, has a composition represented by formula (1E). A first sulfide phosphor, for example, has a composition represented by formula (1F).

[0070] (ij)MgO·(j / 2)Sc2O3·kMgF2·mCaF2·(1-n)GeO2·(n / 2)M 3 2O3:Mn (1D)

[0071] (In formula (1D), M) 3 It is selected from at least one of Al, Ga, and In. i, j, k, m, n, and z satisfy 2≤i≤4, 0≤j<0.5, 0<k<1.5, 0≤m<1.5, and 0≤n<0.5, respectively.

[0072] M 4 v2 M 5 w2 Al 3-y2 Si y2 N z2 :M 6 (1E)

[0073] (In formula (1E), M) 4 It is at least one element selected from Ca, Sr, Ba, and Mg, M 5 It is at least one element selected from Li, Na, and K, M 6 It is at least one element selected from Eu, Ce, Tb, and Mn, and v2, w2, y2, and z2 satisfy 0.80≤v2≤1.05, 0.80≤w2≤1.05, 0≤y2≤0.5, and 3.0≤z2≤5.0, respectively.

[0074] (Ca,Sr)S:Eu (1F)

[0075] In this specification, in the formula representing the composition of a phosphor, multiple elements separated by commas (,) mean that the composition contains at least one of these multiple elements, or may combine two or more elements from multiple elements.

[0076] Fluorogermanate phosphors having a composition represented by formula (1D) can also have a composition represented by the following formula (1d).

[0077] 3.5MgO·0.5MgF2·GeO2:Mn (1d)

[0078] The fourth nitride phosphor having the composition represented by formula (1E) can also have the composition represented by the following formula (1e).

[0079] M 4 v2 M 5 w2 M 6 x2 Al 3-y2 Si y2 N z2 (1e)

[0080] (In equation (1e), M) 4 M 5 and M 6 respectively with M in equation (1E) 4 M 5 and M 6 Synonyms, v2, w2, y2, and z2 are synonyms of v2, w2, y2, and z2 in equation (1E), respectively, and x2 satisfies 0.001 < x2 ≤ 0.1.

[0081] The fluorogermanate phosphor, the fourth nitride phosphor, and the first sulfide phosphor have emission peak wavelengths in the range of 570 nm to 680 nm, preferably in the range of 600 nm to 630 nm. Regarding the fluorogermanate phosphor, the fourth nitride phosphor, and the first sulfide phosphor, the full width at half maximum (FWHM) of the emission peak with the emission peak wavelength in the emission spectrum of the first phosphor is, for example, 5 nm to 100 nm, preferably 6 nm to 90 nm.

[0082] The light-emitting device of the first embodiment may contain at least one first phosphor or two or more first phosphors. By including the first phosphors, the light-emitting device, when installed outdoors, has a correlated color temperature of 1950K or lower that does not feel unnatural to humans; an average color rendering index Ra of 51 or higher, which is required for light-emitting devices used outdoors or even indoors in locations close to the outdoors; a full width at half maximum (FWHM) of 110 nm or lower for the emission peak with the highest luminous intensity in the emission spectrum; and emits light with a low insect-attracting effect, having an insect-attracting index I of 0.031 or lower.

[0083] The light-emitting device of the second embodiment must include a first nitride phosphor having the composition represented by formula (1A) as a first phosphor. The light-emitting device, by including a first nitride phosphor having the composition represented by formula (1A) as a first phosphor, together with light from a light-emitting element having a peak emission wavelength in the range of 400 nm to 490 nm, and by passing light from the first phosphor including the first nitride phosphor, has a correlated color temperature of 1950 K or less, and the full width at half maximum (FWHM) of the emission peak having the maximum emission intensity in the emission spectrum of the light-emitting device is 110 nm or less, and is capable of emitting light with a low insect-attracting effect, having an insect-attracting index I of 0.031 or less. The light-emitting device of the second embodiment must include a first phosphor having the composition represented by formula (1A) as a first phosphor, and may also include at least one selected from a second nitride phosphor having the composition represented by formula (1B), a fluoride phosphor having the composition represented by formula (1C), and a fluoride phosphor having the composition represented by formula (1C'). In addition, the light-emitting device of the second embodiment must include a first nitride phosphor having the composition represented by formula (1A) as a first phosphor, and may also include at least one phosphor selected from the following: a second nitride phosphor having the composition represented by formula (1B), a fluoride phosphor represented by formula (1C), a fluoride phosphor represented by formula (1C'), a fluorogermanate phosphor having the composition represented by formula (1D), a fourth nitride phosphor having the composition represented by formula (1E), and a first sulfide phosphor represented by formula (1F).

[0084] The light-emitting device of the second embodiment must include a first nitride phosphor having a composition represented by formula (1A) as a first phosphor, and may also include at least one phosphor selected from a fluorogermanate phosphor having a composition represented by formula (1D), a fourth nitride phosphor having a composition represented by formula (1E), and a first sulfide phosphor represented by formula (1F).

[0085] Where a first nitride fluorophore having the composition represented by formula (1A) must be included as the first fluorophore, it is also permissible for all of the first fluorophores to be first nitride fluorophores. Where a first nitride fluorophore having the composition represented by formula (1A) must be included as the first fluorophore and first fluorophores other than those having the composition represented by formula (1A) are also included, the mass ratio of the first nitride fluorophore to the first fluorophores other than those in the first nitride fluorophore (first nitride fluorophore / first fluorophores other than those in the first nitride fluorophore) in the first fluorophore can be in the range of 99 / 1 to 1 / 99, or in the range of 98 / 2 to 10 / 90, or in the range of 95 / 5 to 30 / 70. The first fluorophore other than the first nitride fluorophore with the composition represented by formula (1A) refers to at least one fluorophore selected from the following: the second nitride fluorophore with the composition represented by formula (1B), the fluoride fluorophore represented by formula (1C), the fluoride fluorophore represented by formula (1C'), the fluorogermanate fluorophore with the composition represented by formula (1D), the fourth nitride fluorophore with the composition represented by formula (1E), and the first sulfide fluorophore represented by formula (1F).

[0086] The content of the first phosphor in the light-emitting device varies depending on the shape of the light-emitting device. When the wavelength conversion component of the light-emitting device includes the first phosphor, the wavelength conversion component preferably includes a phosphor and a light-transmitting material. The wavelength conversion component may also be a wavelength converter including a phosphor and a light-transmitting material. The total amount of phosphor included in the wavelength conversion component, relative to 100 mass fractions of the light-transmitting material, can be in the range of 10 mass fractions or more and 900 mass fractions or less, or in the range of 15 mass fractions or more and 850 mass fractions or less, or in the range of 20 mass fractions or more and 800 mass fractions or less. When the light-emitting device includes only the first phosphor and no other phosphors besides the first phosphor, the total amount of phosphor refers to the total amount of the first phosphor. When the light-emitting device includes both a first phosphor and a second phosphor, the total amount of phosphor refers to the total amount of both the first and second phosphors.

[0087] When the light-emitting device includes a second phosphor (described later), the content of the first phosphor in the light-emitting device is preferably in the range of 5% by mass or more and 95% by mass or less relative to the total amount of the first phosphor and the second phosphor. If the content of the first phosphor in the light-emitting device is in the range of 5% by mass or more and 95% by mass or less relative to the total amount of the first phosphor and the second phosphor, the correlated color temperature is 1950 K or less, the full width at half maximum (FWHM) of the emission peak with the maximum emission intensity in the emission spectrum of the light-emitting device is 110 nm or less, and it can emit light with a low insect-attracting effect, where the insect attraction index I is 0.031 or less. The content of the first phosphor in the light-emitting device may also be in the range of 8% by mass or more and 80% by mass or less relative to the total amount of the first phosphor and the second phosphor, or it may be in the range of 10% by mass or more and 70% by mass or less, or it may be in the range of 11% by mass or more and 60% by mass or less.

[0088] Second phosphor

[0089] The light-emitting device preferably includes a second phosphor having a peak emission wavelength in the range of 480 nm or greater and less than 570 nm. The second phosphor is excited by the light-emitting element having a peak emission wavelength in the range of 400 nm or greater and 490 nm, emitting light with a peak emission wavelength in the range of 480 nm or greater and less than 570 nm. The second phosphor may also be excited by the light-emitting element to have a peak emission wavelength in the range of 490 nm or greater and 565 nm, or it may have a peak emission wavelength in the range of 495 nm or greater and 560 nm. Regarding the second phosphor, the full width at half maximum (FWHM) of the emission peak with the peak emission wavelength in the emission spectrum of the second phosphor is preferably in the range of 20 nm or greater and 125 nm, or it may be in the range of 25 nm or greater and 124 nm, or it may be in the range of 30 nm or greater and 123 nm. In order to ensure that the correlated color temperature is not incongruous when used as a light-emitting device for outdoor use or even indoor use in places close to the outdoors, to meet the color rendering requirements for light-emitting devices used outdoors or even indoor use in places close to the outdoors, and to emit light with low insect-attracting effect, the full width at half maximum (FWHM) of the emission peak with the emission peak wavelength in the emission spectrum of the second phosphor is preferably within the range described above.

[0090] In order to obtain the above-mentioned emission spectrum, the second phosphor preferably includes at least one selected from rare earth aluminate phosphors having a composition represented by the following formula (2A) and a third nitride phosphor having a composition represented by the following formula (2B).

[0091] Ln 1 3(Al 1-a Gaa )5O 12 :Ce (2A)

[0092] (In equation (2A), Ln) 1 It is at least one element selected from Y, Gd, Tb, and Lu, where a satisfies 0 ≤ a ≤ 0.5.

[0093] La w Ln 2 x Si6N y :Ce z (2B)

[0094] (In equation (2B), Ln) 2 It must contain at least one selected from Y and Gd, and may also contain at least one selected from Sc and Lu, in the composition of 1 mole containing Ln 2 When the element is set to 100 mol%, Ln 2 The total amount of Y and Gd contained therein is over 90 mol%, and w, x, y, and z satisfy the following conditions: 1.2 ≤ w ≤ 2.2, 0.5 ≤ x ≤ 1.2, 10 ≤ y ≤ 12.0, 0.5 ≤ z ≤ 1.2, 1.80 < w + x < 2.40, and 2.9 ≤ w + x + z ≤ 3.1.

[0095] The rare earth aluminate phosphor having a composition represented by formula (2A) and the third nitride phosphor having a composition represented by formula (2B) have a full width at half maximum (FWHM) of the emission peak having the emission peak wavelength in the emission spectrum of the phosphor, for example, being 90 nm or more, preferably 100 nm or more, more preferably 110 nm or more, and also, for example, being 125 nm or less, preferably 124 nm or less, more preferably 123 nm or less.

[0096] The second phosphor may also comprise at least one phosphor selected from alkaline earth metal aluminate phosphors and alkaline earth metal halosilicate phosphors. Alkaline earth metal aluminate phosphors are, for example, phosphors containing at least strontium and activated by europium, having a composition represented by formula (2C). Alkaline earth metal halosilicate phosphors are, for example, phosphors containing at least calcium and chlorine and activated by europium, having a composition represented by formula (2D).

[0097] Sr4Al 14 O 25 Eu (2C)

[0098] (Ca,Sr,Ba)8MgSi4O 16 (F,Cl,Br)2:Eu (2D)

[0099] In formula (2C), a portion of Sr may also be replaced by at least one element selected from Mg, Ca, Ba and Zn.

[0100] Alkaline earth metal aluminate phosphors having a composition represented by formula (2C) and alkaline earth metal halosilicate phosphors having a composition represented by formula (2D) have emission peak wavelengths in the range of greater than or equal to 480 nm and less than 520 nm, preferably in the range of 485 nm and more and less than 515 nm.

[0101] The alkaline earth metal aluminate phosphor having a composition represented by formula (2C) and the alkaline earth metal halosilicate phosphor having a composition represented by formula (2D) have a full width at half maximum (FWHM) of the emission peak having the emission peak wavelength in the emission spectrum of the phosphor being, for example, 30 nm or more, preferably 40 nm or more, more preferably 50 nm or more, and also, for example, 80 nm or less, preferably 70 nm or less.

[0102] The second phosphor may also comprise at least one phosphor selected from β-thion phosphors, second sulfide phosphors, scandium phosphors, and alkaline earth metal silicate phosphors. β-thion phosphors, for example, have a composition represented by formula (2E). Second sulfide phosphors, for example, have a composition represented by formula (2F). Scandium phosphors, for example, have a composition represented by formula (2G). Alkaline earth metal silicate phosphors, for example, have a composition represented by formula (2H) or formula (2J).

[0103] Si 6-g Al g O g N 8-g Eu(0<g≤4.2) (2E)

[0104] (Sr,M 7 Ga2S4:Eu (2F)

[0105] (In equation (2F), M) 7 This indicates that at least one element is selected from Be, Mg, Ca, Ba, and Zn.

[0106] (Ca,Sr)Sc2O4:Ce (2G)

[0107] (Ca,Sr)3(Sc,Mg)2Si3O 12 :Ce (2H)

[0108] (Ca,Sr,Ba)2SiO4:Eu (2J)

[0109] β-thion phosphors, second sulfide phosphors, scandium phosphors, and alkaline earth metal silicate phosphors have emission peak wavelengths in the range of 520 nm or higher and shorter than 580 nm, preferably in the range of 525 nm or higher and 565 nm lower. For the second phosphor, the full width at half maximum (FWHM) of the emission peak at the emission peak wavelength is, for example, 20 nm or higher, preferably 30 nm or higher, and also, for example, 120 nm or lower, preferably 115 nm or lower.

[0110] The second phosphor may also comprise at least one phosphor selected from the following: a rare-earth aluminate phosphor having the composition represented by formula (2A); a third nitride phosphor having the composition represented by formula (2B); an alkaline-earth metal aluminate phosphor having the composition represented by formula (2C); an alkaline-earth metal halosilicate phosphor having the composition represented by formula (2D); a β-thionon phosphor having the composition represented by formula (2E); a second sulfide phosphor having the composition represented by formula (2F); a scandium phosphor having the composition represented by formula (2G); an alkaline-earth metal silicate phosphor having the composition represented by formula (2H); and an alkaline-earth metal silicate phosphor having the composition represented by formula (2J). The second phosphor may comprise at least one phosphor or more than two phosphors.

[0111] The light-emitting device preferably emits light with a color deviation (Duv) of -0.008 or more and +0.008 relative to the blackbody radiation trajectory. The color deviation (Duv) is the deviation of the light emitted by the light-emitting device from the blackbody radiation trajectory and is measured according to JIS Z8725. Even in cases where the correlated color temperature is relatively low (below 1950K), if the color deviation (Duv) relative to the blackbody radiation trajectory (Duv = 0.000) on the CIE 1931 chromaticity diagram is within the range of -0.008 or more and +0.008, the light emitted from the light-emitting device will have a natural hue and will not cause discomfort to the irradiated object. The light-emitting device preferably emits light with a color deviation (Duv) of -0.008 to +0.008 relative to the blackbody radiation trajectory, below 1950K. More preferably, it emits light with a Duv of -0.006 to +0.006. Even more preferably, it emits light with a Duv of -0.003 to +0.003. If light with a color deviation (Duv) of less than -0.008 or greater than +0.008 relative to the blackbody radiation trajectory is emitted, the irradiated object deviates from its natural hue, which can sometimes create a sense of disharmony.

[0112] Figure 1AIt is a diagram showing the spectral locus and the blackbody radiation locus (Duv = 0.000) within the pure violet locus in the CIE 1931 chromaticity diagram, and the color deviation relative to the blackbody radiation locus. Figure 1B It means Figure 1A A magnified view of a portion of the image shows the blackbody radiation trajectory in the CIE 1931 chromaticity diagram, with x-values ​​greater than or equal to 0.300 and less than 0.600 and y-values ​​greater than or equal to 0.250 and less than 0.500. The image also shows the color deviations relative to the blackbody radiation trajectory, specifically the trajectories with Duv values ​​of -0.020, -0.010, -0.008, +0.008, +0.010, and +0.020. Figure 1B In the diagram, the straight lines intersecting the blackbody radiation trajectory (Duv = 0.000) are the isochromatic temperature lines at each correlated color temperature (CCT = 1700K, 1950K, 2000K, 2700K, 3000K, 4000K, 5000K, 6500K). When the color deviation (Duv) of the mixed light emitted from the light-emitting device is 0.000, there is no deviation relative to the blackbody radiation trajectory, and it approximates the blackbody radiation trajectory.

[0113] The light-emitting device preferably emits light with a second radiance in the range of 650 nm to 750 nm that is 50% or less relative to 100% of the first radiance in the range of 400 nm to 750 nm. In the emission of light by the light-emitting device, the ratio of the second radiance in the range of 650 nm to 750 nm to 100% of the first radiance in the range of 400 nm to 750 nm is also referred to as Lp. If the ratio Lp of the second radiance of the light emitted by the light-emitting device to the first radiance is 50% or less, then in the mixed-color light emitted from the light-emitting device, there is less red light, and the light emitted from the light-emitting device has a low insect-attracting effect without reducing the brightness. The ratio Lp of the second radiance of the light emitted by the light-emitting device to the first radiance can also be 45% or less, 40% or less, 35% or less, or 30% or less. In order to emit light with good color rendering, the ratio Lp of the second radiance of the light emitted by the light-emitting device to the first radiance can be 5% or more, or 8% or more.

[0114] The ratio Lp of the second radiance of the light emitted by the light-emitting device to the first radiance is derived by the following equation (4). The ratio Lp of the second radiance of the light emitted by the light-emitting device to the first radiance represents the proportion of the long-wavelength red component of the mixed light emitted from the light-emitting device.

[0115]

[0116] The light-emitting device preferably emits light with a relative insect-attracting index I / I0 of 99% or less. The relative insect-attracting index I / I0 refers to the ratio of the insect-attracting index I derived from equation (1) of a light-emitting device emitting light with a correlated color temperature of 1950K or less, when the baseline insect-attracting index I0 of a light-emitting device emitting light with a correlated color temperature exceeding 1950K is set to 100%. Regarding the baseline insect-attracting index I0, the lowest value of the insect-attracting index among the light-emitting devices that are the subjects of the measurement (emitting light with a correlated color temperature exceeding 1950K) can be used as the baseline insect-attracting index I0. If the relative insect-attracting index I / I0 is less than 99%, the insect-attracting effect is reduced, and light with a low insect-attracting effect is emitted from the light-emitting device. If light with a relative insect-attracting index I / I0 of less than 10% is emitted from the light-emitting device, the low insect-attracting effect is greater compared to a light-emitting device emitting light with a correlated color temperature exceeding 1950K, but the color balance of the light is unbalanced, and the color rendering index decreases. To meet the color rendering requirements of light-emitting devices used outdoors or indoors in locations close to the outdoors, and to increase their insect-attracting effect, the light-emitting device preferably emits light with a relative insect-attracting index (I / I0) of 10% or higher and 99% or lower. Light-emitting devices emitting light with a correlated color temperature of 1950K or lower may also have a relative insect-attracting index (I / I0) of 10% or higher and 99% or lower, 30% or higher and 97% or lower, or 40% or higher and 95% or lower.

[0117] The insect-attracting index I0 of a light-emitting device that emits light with a correlated color temperature exceeding 1950K can be derived by the following formula (5).

[0118]

[0119] (In equation (5), I0 is the insect attraction index of a light-emitting device with a correlated color temperature exceeding 1950K, S0(λ) is the spectral radiance of the light emitted by the light-emitting device with a correlated color temperature exceeding 1950K, and V(λ) and R(λ) are synonyms with equation (1).)

[0120] The relative insecticidal index I / I0 (%) can be derived by the following equation (6).

[0121]

[0122] An example of a light-emitting device is illustrated with reference to the accompanying drawings. Figure 2 and Figure 3 This is a schematic cross-sectional view showing the light-emitting device of the first configuration example.

[0123] like Figure 2As shown, the light-emitting device 100 includes a light-emitting element 10 having a peak emission wavelength in the range of 400 nm or more and 490 nm or less, and a first phosphor 71 that emits light when excited by light from the light-emitting element 10.

[0124] The light-emitting device 100 includes a molded body 41, a light-emitting element 10, and a wavelength conversion component 21. The molded body 40 is integrally formed of a first lead 2, a second lead 3, and a resin portion 42 comprising a thermoplastic resin or a thermosetting resin. The molded body 41 forms a recess with a bottom surface and side surfaces, and the light-emitting element 10 is mounted on the bottom surface of the recess. The light-emitting element 10 has a pair of positive and negative electrodes, which are electrically connected to the first lead 2 and the second lead 3 respectively via wires 60. The light-emitting element 10 is covered by the wavelength conversion component 21. The wavelength conversion component 21 includes, for example, a phosphor 70 that converts the wavelength of light from the light-emitting element 10 and a light-transmitting material. The wavelength conversion component 21 also functions as a sealing component that covers the light-emitting element 10 and the phosphor 70 in the recess of the molded body 41. The phosphor 70 includes a first phosphor 71 that has a peak emission wavelength in the range of 570 nm to 680 nm or less when excited by light from the light-emitting element. A portion of the first lead 2 and the second lead 3 of the positive and negative electrodes connected to the light-emitting element 10 are exposed to the outside of the package constituting the light-emitting device 100. Through these first leads 2 and second leads 3, the light-emitting device 100 can receive power from the outside to emit light.

[0125] like Figure 3 As shown, the light-emitting device 200, except for the phosphor 70 which includes a second phosphor 72 having an emission peak wavelength in the range of 480 nm to 570 nm, is similar to... Figure 2 The light-emitting device 100 shown is the same, and the same parts are labeled with the same reference numerals.

[0126] The wavelength conversion component in the light-emitting device of the first embodiment includes a phosphor and a light-transmitting material. Regarding the light-transmitting material used in the wavelength conversion component, at least one selected from resin, glass, and inorganic materials can be cited, with resin being preferred. The resin is preferably selected from at least one selected from epoxy resin, silicone resin, phenolic resin, and polyimide resin. Regarding inorganic materials, at least one selected from alumina and aluminum nitride can be cited. In addition to the phosphor and the light-transmitting material, the wavelength conversion component may also include fillers, colorants, and light-diffusing materials as needed. Examples of fillers include, for example, silicon oxide, barium titanate, titanium oxide, and alumina. The content of other components besides the phosphor and the light-transmitting material in the wavelength conversion component, based on the total content of the other components, can be in the range of 0.01% to 50% by mass relative to 100% of the light-transmitting material, or in the range of 0.1% to 45% by mass, or in the range of 0.5% to 40% by mass.

[0127] Method for manufacturing a light-emitting device in the first embodiment

[0128] The manufacturing method of the light-emitting device according to the first embodiment will be described. It should be noted that details can also be found in, for example, the disclosure in Japanese Patent Application Publication No. 2010-062272. The manufacturing method of the light-emitting device preferably includes a preparation step of a molded body, a placement step of light-emitting elements, a placement step of components for wavelength conversion parts, and a resin encapsulation forming step. When an aggregate molded body with multiple recesses is used as the molded body, a single-piece process for separating the resin encapsulation of each unit area after the resin encapsulation forming step may also be included.

[0129] In the preparation process of the molded body, multiple leads are integrally molded using thermosetting or thermoplastic resin to prepare a molded body having recesses on the sides and bottom. The molded body can also be a molded body composed of an aggregate matrix containing multiple recesses.

[0130] In the process of arranging the light-emitting element, the light-emitting element is arranged on the bottom surface of the recess of the molded body, and the positive and negative electrodes of the light-emitting element are connected to the first lead and the second lead through wires.

[0131] In the process of assembling the component for the wavelength conversion part, the component for the wavelength conversion part is arranged in the recess of the molded body.

[0132] In the resin encapsulation molding process, the wavelength conversion component disposed in the recess of the molded body is cured with the composition to form a resin encapsulation, thereby manufacturing a light-emitting device. When using a molded body composed of an aggregate substrate containing multiple recesses, after the resin encapsulation forming process, in the monolithization process, the resin encapsulation of each unit region of the aggregate substrate having multiple recesses is separated to manufacture each light-emitting device. As described above, it is possible to manufacture... Figure 2 or Figure 3 The light-emitting device of the first configuration example shown.

[0133] Figure 4 This is a schematic perspective view of the light-emitting device in the second configuration example. Figure 5 This is a schematic cross-sectional view showing the light-emitting device of the second configuration example.

[0134] like Figure 4 and Figure 5 As shown, the light-emitting device 300 includes a support body 1, a light-emitting element 10 disposed on the support body 1, a wavelength conversion member 22 containing a phosphor 70 disposed on the upper surface of the light-emitting element 10, and a light-reflecting member 43 disposed on the side of the support body 1 beside the wavelength conversion member 22 and the light-emitting element 10. A sealing member 50 is provided on the upper surface of the wavelength conversion member 22. The sealing member 50 has a lens portion 51 that is circular in plan view and hemispherical in cross-section, and a flange portion 52 extending to the outer periphery of the lens portion 51. The lens portion 51 is circular in plan view and hemispherical in cross-section. The flange portion 52 extends to the outer periphery of the lens portion 51.

[0135] The wavelength conversion component 22 is larger than the light-emitting element 10 when viewed from above. Furthermore, a light-transmitting component 30 is provided between the side of the light-emitting element 10 and the light-reflecting component 43, contacting both the side of the light-emitting element 10 and a portion of the wavelength conversion component 22. The light-transmitting component 30 includes a light-transmitting bonding component 32 disposed between the light-emitting element 10 and the wavelength conversion component 22. The light-transmitting bonding component 32 can be an adhesive used to bond the light-emitting element 10 and the wavelength conversion component 22. This light-transmitting bonding component 32 can also extend a portion towards the corner formed by the side of the light-emitting element 10 and the main surface of the wavelength conversion component 22 on the light-emitting element 10 side. Additionally, as... Figure 5As shown, the cross-sectional shape of the extended light-transmitting bonding member 32 can be an inverted triangle extending towards the light-reflecting member 43. The light-transmitting member 30 and the bonding member 32 can utilize a light-transmitting resin. The support body 1 is a component for mounting the light-emitting element 10, the sealing member 50, etc., on its upper surface. The support body 1 includes an insulating base material and conductive components 4 such as wiring patterns for mounting the light-emitting element on the surface of the base material. The light-reflecting member 43 is a component for covering the light-transmitting member 30, the bonding member 32, and the wavelength conversion member 22. It should be noted that details of the light-emitting device of the second configuration example and the manufacturing method of the light-emitting device of the second configuration example described later can also be found in, for example, the disclosure of Japanese Patent Application Publication No. 2020-57756.

[0136] The wavelength conversion component of the light-emitting device in the second embodiment, like the wavelength conversion component of the light-emitting device in the first embodiment, includes a phosphor and a light-transmitting material. The phosphor includes a first phosphor that has a peak emission wavelength in the range of 570 nm to 680 nm when excited by light from the light-emitting element. The phosphor may also include a second phosphor that has a peak emission wavelength in the range of 480 nm to 570 nm when excited by light from the light-emitting element. The light-transmitting material can be the same as that used in the wavelength conversion component of the light-emitting device in the first embodiment. Furthermore, in addition to the phosphor and the light-transmitting material, the wavelength conversion component of the light-emitting device in the second embodiment, like the wavelength conversion component of the light-emitting device in the first embodiment, may also include fillers, colorants, and light-diffusing materials as needed.

[0137] Method for manufacturing the light-emitting device in the second constituent example

[0138] This describes an example of a method for manufacturing the light-emitting device according to the second embodiment. The method for manufacturing the light-emitting device according to the second embodiment includes a process for arranging light-emitting elements, a process for preparing wavelength conversion components, a process for forming light-transmitting components and bonding components, a process for arranging light-reflecting components, and a process for arranging sealing components. It may also include a process for separating individual units.

[0139] In the process of assembling the light-emitting element, the light-emitting element is mounted on a pre-prepared support using a flip-chip method. In the process of preparing the wavelength conversion component, the wavelength conversion component, which contains a phosphor and a light-transmitting material, is pre-formed into a plate, sheet, or layer shape by curing the composition, and monolithically sized to be mounted on the light-emitting element. In the process of forming the light-transmitting component and the bonding component, a light-transmitting adhesive is applied to the upper surface of the light-emitting element, and the wavelength conversion component is bonded to the upper surface of the light-emitting element. Adhesive overflowing from the interface between the light-emitting element and the wavelength conversion component extends from the side of the light-emitting element toward the periphery of the wavelength conversion component and adheres thereto, curing in a filler-like manner to form the light-transmitting component and the bonding component. In the process of assembling the light-reflecting component, white resin is disposed on the upper surface of the support to cover the sides of the wavelength conversion component and the light-transmitting component, and then cured to assemble the light-reflecting component. Finally, a sealing component is disposed on the upper surface of the wavelength conversion component and the light-reflecting component. Thus, the light-emitting device of the second configuration example can be manufactured.

[0140] Lighting fixtures

[0141] The luminaire may include at least one of the aforementioned light-emitting devices. The luminaire may be configured to include the aforementioned light-emitting devices, and may also include a reflective component, a protective component, and an auxiliary device for supplying power to the light-emitting devices. The luminaire may also include multiple light-emitting devices. When the luminaire has multiple light-emitting devices, it may include multiple identical light-emitting devices or multiple light-emitting devices of different shapes. Furthermore, it may include a driving device capable of individually driving multiple light-emitting devices and adjusting the brightness of each device. The luminaire can be used in any of the following ways: direct mounting, recessed mounting, or suspended mounting.

[0142] Streetlights

[0143] A street light only needs to have at least one of the above-mentioned light-emitting devices. Figure 6 This diagram illustrates an example of a streetlight. The streetlight 1000 includes a utility pole P installed on a sidewalk W or a roadway C, and a support S for a light-emitting device Le. The support S has a light-transmitting portion T, made of acrylic, polycarbonate, or glass, that covers the area around the light-emitting device Le and allows at least a portion of the light emitted by the device Le to pass through. The streetlight 1000 can illuminate a lower area from a higher location using the light-emitting device Le installed in the support S, which is integrated with the utility pole P. The streetlight is not limited to... Figure 6 The example shown.

[0144] Streetlights can be various types of streetlights, including those with utility poles that allow for arbitrary height adjustment of the support structure, those with brackets that replace utility poles and support the support structure, those that illuminate from below, and those that are embedded in landscape materials such as pillars or blocks.

[0145] Example

[0146] The present invention will now be described in detail through embodiments. However, the present invention is not limited to these embodiments.

[0147] In the light-emitting devices of the various embodiments and comparative examples, the following first phosphor and / or second phosphor were used.

[0148] First fluorescent

[0149] As shown in Table 1, first nitride phosphors BSESN-1, BSESN-2, and BSESN-3, which have different emission peak wavelengths and full width at half maximum (FWHM) and are contained in the composition represented by formula (1A), and second nitride phosphors SCASN-1, SCASN-2, SCASN-3, SCASN-4, SCASN-5, and SCASN-6, which are contained in the composition represented by formula (1B), were prepared as first phosphors.

[0150] Second phosphor

[0151] As second phosphors, as shown in Table 2, rare earth aluminate phosphors G-YAG1 and G-YAG2 with different emission peak wavelengths and full width at half maximum (FWHM) and containing Y, Al and Ga in the composition represented by formula (2A), and rare earth aluminate phosphors YAG1 and YAG3 containing Y and Al in the composition represented by formula (2A) were prepared.

[0152] Determination of the emission spectrum of phosphors

[0153] For each phosphor, the emission spectra at room temperature (approximately 25°C) were measured using a quantum efficiency measuring device (QE-2000, manufactured by Otsuka Electronics Co., Ltd.) by irradiating each phosphor with light of an excitation wavelength of 450 nm. The emission peak wavelength and full width at half maximum (FWHM) of each emission spectrum were then determined. The results are shown in Tables 1 and 2.

[0154] [Table 1]

[0155] Peak wavelength (nm) Full width at half maximum (nm) SCASN1 608 73.5 SCASN2 612 74.6 SCASN3 620 72.9 SCASN4 628 75.4 SCASN5 639 83.7 SCASN6 642 96.4 BSESN1 582 69.2 BSESN2 586 74.2 BSESN3 594 80.6

[0156] [Table 2]

[0157] Peak wavelength (nm) Full width at half maximum (nm) G-YAG1 539 108.8 G-YAG2 540 109 YAG1 548 111.2 YAG3 565 118.9

[0158] Example 1

[0159] A light-emitting device according to the second embodiment was manufactured. The light-emitting device of the second embodiment can be referred to Figure 4 and Figure 5 .

[0160] Light-emitting element configuration process

[0161] The support 1 uses a ceramic substrate made of aluminum nitride. The light-emitting element 10 uses a nitride-based semiconductor layer with a peak emission wavelength of 450 nm. Regarding the size of the light-emitting element 10, its planar shape is approximately a square with a side length of about 1.0 mm and a thickness of about 0.11 mm. The light-emitting element is configured such that the light emitting surface is on the sealing component side, and it is mounted in a flip-chip manner using bumps made of conductive components 4 made of Au.

[0162] Preparation process for wavelength conversion components

[0163] Silicone resin was used as the light-transmitting material constituting the wavelength conversion component 22. Regarding the composition of the wavelength conversion component, relative to the mass fraction of the light-transmitting material 100, the correlated color temperature of the mixed light from the light-emitting element 10 and the phosphor 70 containing the first and second phosphors was adjusted such that the total amount of phosphor 70 and the mixing ratio of the first and second phosphors were as shown in Table 3. Regarding the composition of the wavelength conversion component, relative to the mass fraction of the silicone resin 100, 2 parts by mass of alumina were added as a filler. Next, the prepared composition of the wavelength conversion component was heated at 180°C for 2 hours to cure it into a sheet, thus preparing a monolithic sheet-shaped wavelength conversion component 22 with an aspect ratio of approximately 0.1 mm, a planar shape of approximately 1.6 mm on each side, and a thickness of approximately 150 μm.

[0164] Forming process of light-transmitting components and joining components

[0165] A phenyl silicone resin, which serves as a transparent adhesive, is applied to the upper surface of the light-emitting element 10 to bond the wavelength conversion component 22. A transparent adhesive is then applied to the interface between the light-emitting element 10 and the wavelength conversion component 22, and the mixture is cured at 150°C for 4 hours to form a transparent component 30 and a bonding component 32 that are cured in a fillet-like manner, extending from the side of the light-emitting element 10 toward the periphery of the wavelength conversion component 22.

[0166] Configuration process of light reflective components

[0167] As a component for a light-reflecting component, a component for a light-reflecting component was prepared comprising dimethyl silicone resin and titanium oxide particles with an average particle size (simulated value) of 0.28 μm, wherein the titanium oxide particles comprise 60% of the mass of the dimethyl silicone resin. On the upper surface of the support 1, a white resin, i.e., the component for the light-reflecting component, was disposed to cover the sides of the wavelength conversion component 22 and the light-transmitting component 30, and then cured to form the light-reflecting component 43.

[0168] Sealing component configuration process

[0169] Finally, a sealing member 50 is provided, which has a lens portion 51 formed by curing phenyl silicone resin, which is circular in top view and hemispherical in cross-section, and a flange portion 52 extending to the outer periphery of the lens portion 51, to manufacture a light-emitting device 300 that emits light with a correlated color temperature of 1950K or less.

[0170] Comparative Example 1

[0171] In the preparation process of the wavelength conversion component, relative to the mass of the light-transmitting material 100, a composition for the wavelength conversion component containing the first phosphor and the second phosphor is prepared in such a way that the correlated color temperature of the mixed light from the light-emitting element 10 and the light of the phosphor 70 containing the first phosphor and the second phosphor is around 2200, and the total amount of phosphor 70 and the mixing ratio of the first phosphor and the second phosphor are the amounts shown in Table 3. Otherwise, a light-emitting device 300 of the second configuration example emitting light with a correlated color temperature of 2200K or higher is manufactured in the same manner as in Example 1.

[0172] Examples 2 to 5

[0173] A light-emitting device according to the first embodiment was manufactured. The light-emitting device of the first embodiment can be referenced to a device including a first phosphor and a second phosphor. Figure 3 .

[0174] The light-emitting element 10 uses a nitride-based semiconductor layer with a peak emission wavelength of 450 nm. Regarding the size of the light-emitting element 10, the planar shape is approximately a square with a side length of about 700 mm and a thickness of about 200 mm.

[0175] As the first lead 2 and the second lead 3, a lead frame is used, and the first lead 2 and the second lead 3 are integrally molded using epoxy resin, thus preparing a molded body 41 having recesses with side surfaces and bottom surfaces.

[0176] A light-emitting element 10 is disposed on the bottom surface of the recess of the molded body 41, and the positive and negative electrodes of the light-emitting element 10 and the first lead 2 and the second lead 3 are connected by Au wires 60.

[0177] Silicone resin was used as the light-transmitting material constituting the wavelength conversion component 21. Regarding the composition of the wavelength conversion component, relative to the mass of the light-transmitting material 100, the correlated color temperature of the mixed light from the light-emitting element 10 and the light from the phosphor 70 containing the first phosphor 71 and the second phosphor 72 was prepared such that the total amount of phosphor 70 and the mixing ratio of the first phosphor 71 to the second phosphor 72 were in the amounts shown in Table 3. Regarding the composition of the wavelength conversion component, relative to the mass of the silicone resin 100, 2 parts by mass of alumina were also prepared as a filler. Next, the prepared composition of the wavelength conversion component was filled into the recess of the molded body 41.

[0178] The wavelength conversion component filled into the recess of the molded body 41 is heated at 150°C for 3 hours to cure it, forming a resin encapsulation having a wavelength conversion component 21 including a first phosphor 71 and a second phosphor 72, and a light-emitting device 200 of the first configuration example emitting light with a correlated color temperature of 1950K or less is manufactured.

[0179] Example 6

[0180] A light-emitting device according to the first embodiment was manufactured. The light-emitting device of the first embodiment can be compared with a device that includes only a first phosphor and does not include a second phosphor. Figure 2 .

[0181] As a component for the wavelength conversion component, the first phosphor 71 shown in the embodiments of Table 3 is used. The first phosphor 71 is 100% by mass relative to the total amount of phosphor 70 (the total amount of the first phosphor 71) and the total amount of the first phosphor 71 and the second phosphor. Otherwise, resin encapsulation is formed in the same manner as in Embodiment 2, and a light-emitting device 100 emitting light with a correlated color temperature of 1950K or lower is manufactured. As shown in Table 3, two first nitride phosphors, BSESN2 and BSESN3, having compositions represented by formula (1A) but with different compositions, are used as the first phosphor, with a mass ratio (BSESN2 / BSESN3) of 40 / 60.

[0182] Example 7

[0183] As shown in Table 3, two types of phosphors were used as the first phosphor: a first nitride phosphor (BSESN1) having a composition represented by formula (1A) and a second nitride phosphor (SCASN5) having a composition represented by formula (1B). The mass ratio of BSESN1 to SCASN5 (BSESN1 / SCASN5) was 93.3 / 6.7. Otherwise, the first light-emitting device 100 emitting light with a correlated color temperature of 1950K or less was manufactured in the same manner as in Example 6.

[0184] Compare Examples 2 and 3

[0185] A light-emitting device according to the first embodiment was manufactured. The light-emitting device of the first embodiment can be referenced to a device including a first phosphor and a second phosphor. Figure 3 .

[0186] As a component for a wavelength conversion component, and as a light-transmitting material, relative to the mass fraction of phenyl silicone resin 100, the composition for a wavelength conversion component containing first phosphor 71 and second phosphor 72 is prepared such that the correlated color temperature of the mixed light of light from the light-emitting element 10 and the light of phosphor 70 containing first phosphor 71 and second phosphor 72 is around 2000, and the total amount of phosphor 70 and the mixing ratio of first phosphor 71 to second phosphor 72 are the amounts shown in Table 3.

[0187] The wavelength conversion component composition is injected into the light-emitting element 10 in the recess of the molded body 41, the recess is filled, and the wavelength conversion component composition is cured by heating at 150°C for 4 hours to form a wavelength conversion component 21, thereby manufacturing a light-emitting device 200 of the first embodiment that emits light with a correlated color temperature of more than 1950K and less than 2000K.

[0188] The following measurements were performed on each light-emitting device. The results are shown in Table 3.

[0189] The emission spectrum of the light-emitting device

[0190] For each light-emitting device, the emission spectrum was measured using a photometer system combining a spectrophotometer (PMA-12, manufactured by Hamamatsu Photonics Co., Ltd.) and an integrating sphere. The emission spectra of each light-emitting device were measured at room temperature (20°C to 30°C). Figures 7-11 The luminous spectrum (spectral radiance) S(λ) of each luminous device, the relative luminous visibility curve V(λ) of human photopic vision (human luminous visibility), and the spectral luminous efficiency (Bickford) R(λ) of insects (insect luminous visibility) are recorded when the luminance L derived from the above equation (2) is the same for each luminous device.

[0191] Chromaticity coordinates (x, y), correlated color temperature (K), color deviation (Duv), average color rendering index (Ra), special color rendering index (R9), full width at half maximum (FWHM)

[0192] Based on the emission spectra of each light-emitting device, the chromaticity coordinates (x-value, y-value) on the CIE chromaticity diagram of CIE 1931 were measured. The correlated color temperature (CCT:K) and color deviation Duv were measured in accordance with JIS Z8725. The average color rendering index Ra, the specific color rendering index R9, and the full width at half maximum (FWHM) were measured in accordance with JIS Z8726.

[0193] The ratio of the second radiance to the first radiance, Lp

[0194] Based on the emission spectrum (spectral radiance) S(λ) of each light-emitting device, and based on the above formula (4), the ratio Lp(%) of the second radiance in the range of 650nm to 750nm, when the first radiance in the range of 400nm to 750nm is set to 100%, is calculated.

[0195] Insecticidal Index I

[0196] The insect attraction index I of each light-emitting device was determined by substituting the measured emission spectrum (spectral radiance) S(λ), the human standard relative luminous visibility curve V(λ) specified by the CIE, and the insect spectral luminous efficiency (Bickford) R(λ) into Equation (1). The human standard relative luminous visibility curve V(λ) used the emission spectrum with the maximum luminous intensity (peak wavelength) set to 1. The insect spectral luminous efficiency R(λ) used the emission spectrum with the maximum luminous intensity (peak wavelength) set to 1.

[0197] Relative insect attraction index I / I0

[0198] Among the light-emitting devices of Comparative Examples 1 to 3 that emit light with a correlated color temperature exceeding 1950K, the insect-attracting index I of Comparative Example 3, which has the lowest insect-attracting index I, was set as the baseline insect-attracting index I0. The ratio of the insect-attracting index I of each light-emitting device to the baseline insect-attracting index I0, i.e., the relative insect-attracting index I / I0, was calculated based on Equation (6).

[0199] [Table 3]

[0200]

[0201] As shown in Table 3, the light-emitting devices of Examples 1-7 have a correlated color temperature of 1950K or lower, emitting light with a correlated color temperature that is, for example, similar to or slightly lower than that emitted by a high-pressure sodium lamp. When used as a light source for outdoor lighting fixtures as a substitute for a high-pressure sodium lamp, the light-emitting devices of Examples 1-7 also emit light with a natural hue that does not feel unnatural to humans. Furthermore, the full width at half maximum (FWHM) of the emission peak with the highest luminous intensity in the emission spectrum of the light-emitting devices is in the range of 3 nm or more and 110 nm or less. Additionally, the wavelength of the emission peak in the emission spectrum of the light-emitting devices is in the range of 570 nm or more and 680 nm or less. Because the full WHM of the emission peak with the highest luminous intensity in the emission spectrum of the light-emitting devices is 3 nm or more and 110 nm or less, it is possible to suppress the components of long-wavelength light that are difficult for humans to perceive. In addition, the light-emitting devices involved in Examples 1 to 7 emit light with an insect-attracting index I of 0.031 or less derived from the above formula (1). Compared with the brightness of the light emitted by the light-emitting device, the effect of attracting insects is reduced, and the insect-attracting effect is low.

[0202] The light-emitting devices involved in Examples 1 to 7 emit light with a color deviation (Duv) of 0.000 relative to the blackbody radiation trajectory. When emitting light with a correlated color temperature of 1950K or less, the light emitted from the light-emitting device also produces light with a natural hue of the irradiated object that does not feel unnatural to humans.

[0203] The light-emitting devices described in Examples 1-7 emit light with a second radiance in the range of 650 nm to 750 nm, where the ratio (Lp) to 100% of the first radiance in the range of 400 nm to 750 nm is 30% or less. The light-emitting devices described in Examples 1-7 emit light with a relatively low red component in the mixed-color light emitted, thus producing light with a low insect-attracting effect without appearing unnatural.

[0204] The light-emitting devices involved in Examples 1 to 7 have a relative insect-attracting index I / I0 of 30% or more and 95% or less, which reduces the effect of attracting insects and has a low insect-attracting effect.

[0205] The light-emitting devices involved in Examples 1 to 5 have an average color rendering index Ra of 51 or higher, emitting light that has sufficient color rendering even when illuminating roads with heavy traffic or many people.

[0206] The light-emitting devices involved in Examples 6 and 7 have an average color rendering index Ra of 30 or higher, which provides sufficient color rendering for illuminating roads, etc. The insect attraction index I is as low as 0.020 or lower, and the relative insect attraction index I / I0 is in the range of 40 to 50%, emitting light with a low insect attraction effect.

[0207] The light-emitting devices involved in Comparative Examples 1-3 emit light with a slightly higher correlated color temperature than that emitted by high-pressure sodium lamps. When used as a light source for outdoor lighting fixtures such as streetlights or road lighting lamps, replacing high-pressure sodium lamps, the color tone of the illuminated objects appears unnatural and may cause a sense of disharmony. Furthermore, the light-emitting devices involved in Comparative Examples 1-3 have an insect attraction index I exceeding 0.031 and a relative insect attraction index I / I0 exceeding 100%, indicating no reduction in their insect-attracting effect.

[0208] like Figure 7 As shown, the spectral radiance of the light-emitting device according to Example 1 is lower than that of the light-emitting devices according to Comparative Examples 1 and 3 in the wavelength range of 400nm to 615nm, which overlaps with the spectral luminous efficiency of insects, especially in the wavelength range of 400nm to 550nm. This reduces the effect of attracting insects and results in a low insect-attracting effect.

[0209] like Figure 8 As shown, the spectral radiance of the light-emitting devices according to Examples 2 and 3 is slightly lower than that of the light-emitting device according to Comparative Example 3 in the wavelength range of 400 nm to 615 nm, which overlaps with the spectral luminous efficiency of insects. This reduces the effectiveness in attracting insects and results in a low insect-attracting effect. Furthermore, the spectral radiance of the light-emitting devices according to Examples 2 and 3 is slightly higher than that of the light-emitting device according to Comparative Example 3 in the wavelength range of 600 nm to 750 nm, emitting light with excellent color rendering properties and an average color rendering index Ra of 60 or higher.

[0210] like Figure 9 As shown, the spectral radiance of the light-emitting devices involved in Examples 4 and 5 is lower than that of the light-emitting device involved in Comparative Example 3 in the wavelength range of 400 nm to 615 nm, which overlaps with the spectral luminous efficiency of insects, especially in the wavelength range of 400 nm to 550 nm. This reduces the effect of attracting insects and results in a low insect-attracting effect.

[0211] like Figure 10 As shown, the spectral radiance of the light-emitting devices involved in Examples 6 and 7 is significantly lower than that of the light-emitting device involved in Comparative Example 3 in the wavelength range of 400 nm to 615 nm, which overlaps with the spectral luminous efficiency of insects, especially in the wavelength range of 400 nm to 550 nm. As a result, the effect of attracting insects is greatly reduced and the low insect-attracting effect is increased.

[0212] like Figure 11As shown, the spectral radiance of the light-emitting devices involved in Comparative Examples 2 and 3 is the same as that of the light-emitting device involved in Comparative Example 3 in the wavelength range of 400 nm to 615 nm, which overlaps with the spectral luminous efficiency of insects, and the effect of attracting insects is not reduced. In addition, the spectral radiance of the light-emitting device involved in Comparative Example 2 has a larger red component in the wavelength range of 600 nm to 750 nm compared with Comparative Example 3, and the color balance of the mixed light is unbalanced.

[0213] Industrial applicability

[0214] The light-emitting device of one embodiment of the present invention can be used as a light source for streetlights requiring low insect-attracting effect, outdoor lighting fixtures such as harbors and tunnels, headlamps, flashlights or portable lanterns using LEDs, and even indoor lighting fixtures used near entrances, windows, and other places close to the outdoors.

[0215] Explanation of reference numerals in the attached figures

[0216] 1: Support body, 2: First lead wire, 3: Second lead wire, 4: Conductive component, 10: Light-emitting element, 21, 22: Wavelength conversion component, 30: Light-transmitting component, 32: Light-transmitting bonding component, 41: Molded body, 42: Resin part, 43: Light-reflecting component, 50: Sealing component, 51: Lens part, 52: Flange part, 60: Wire, 70: Phosphor, 71: First phosphor, 72: Second phosphor, 100, 200, 300: Light-emitting device, 1000: Street lamp, C: Lane, Le: Light source, P: Utility pole, S: Support part, T: Light-transmitting part, W: Sidewalk.

Claims

1. A light-emitting device, comprising: A light-emitting element having a peak emission wavelength in the range of above 400nm and below 490nm; The first phosphor has a peak emission wavelength in the range of 570 nm to 680 nm. in, The correlated color temperature of the light-emitting device is below 1950K, the average color rendering index Ra is above 51, and the full width at half maximum (FWHM) of the emission peak with the highest luminous intensity in the emission spectrum of the light-emitting device is below 110nm. The ratio of the effective radiant brightness of the light-emitting device, which emits light with an insect-attracting index I of 0.031 or less, wherein the insect-attracting index I is 250 nm or more and 615 nm or less, taking into account the spectral luminous efficiency of insects, to the brightness of light emitted by the light-emitting device, which takes into account the relative luminous ... In equation (1), S(λ) is the spectral radiance of the light emitted by the light-emitting device, V(λ) is the relative luminous visibility curve of human standard of sight as specified by the International Commission on Illumination (CIE), and R(λ) is the spectral luminous efficiency of the insect.

2. A light-emitting device, comprising: A light-emitting element having a peak emission wavelength in the range of above 400nm and below 490nm; The first phosphor has a peak emission wavelength in the range of 570 nm to 680 nm. in, The first phosphor comprises a first nitride phosphor having a composition represented by the following formula (1A). The correlated color temperature of the light-emitting device is below 1950K, and the full width at half maximum (FWHM) of the emission peak with the highest luminous intensity in the emission spectrum of the light-emitting device is below 110nm. The ratio of the effective radiant brightness of the light-emitting device, which emits light with an insect-attracting index I of 0.031 or less, wherein the insect-attracting index I is 250 nm or more and 615 nm or less, taking into account the spectral luminous efficiency of insects, to the brightness of light emitted by the light-emitting device, which takes into account the relative luminous ... M 1 2Si5N8:Eu (1A) In equation (1A), M 1 It is an alkaline earth metal element containing at least one selected from Ca, Sr and Ba; In equation (1), S(λ) is the spectral radiance of the light emitted by the light-emitting device, V(λ) is the relative luminous visibility curve of human standard of sight as specified by the International Commission on Illumination (CIE), and R(λ) is the spectral luminous efficiency of the insect.

3. The light-emitting device according to claim 1, The light-emitting device also includes a second phosphor having a peak emission wavelength in the range of greater than or equal to 480 nm and less than 570 nm.

4. The light-emitting device according to claim 2, The light-emitting device also includes a second phosphor having a peak emission wavelength in the range of greater than or equal to 480 nm and less than 570 nm.

5. The light-emitting device according to claim 1, The first phosphor comprises at least one selected from a first nitride phosphor having a composition represented by formula (1A), a second nitride phosphor having a composition represented by formula (1B), a fluoride phosphor having a composition represented by formula (1C), and a fluoride phosphor having a composition different from formula (1C) and represented by formula (1C'). M 1 2Si5N8:Eu (1A) In equation (1A), M 1 It is an alkaline earth metal element containing at least one selected from Ca, Sr and Ba; Sr. q That s the t And u N v :I (1B) In equation (1B), q, s, t, u and v satisfy 0≤q<1, 0<s≤1, q+s≤1, 0.9≤t≤1.1, 0.9≤u≤1.1 and 2.5≤v≤3.5 respectively; A c [M 2 1－b Mn 4＋ b F d ] (1C) In equation (1C), A contains elements selected from K. ＋ Li ＋ Na ＋ 、Rb ＋ Cs ＋ and NH4 ＋ At least one of them, M 2 It contains at least one element selected from Group 4 and Group 14, b satisfies 0 < b < 0.2, and c is [M]. 2 1－b Mn 4＋ b F d The absolute value of the charge of the ion, d, satisfies 5 < d < 7; A’ c’ [M 2 ’ 1－b’ Mn 4＋ b’ F d’ ] (1C’) In equation (1C'), A' contains elements selected from K. ＋ Li ＋ Na ＋ 、Rb ＋ Cs ＋ and NH4 ＋ At least one of them, M 2 'Contains at least one element selected from Group 4, Group 13, and Group 14, b' satisfies 0 < b' < 0.2, and c' is [M 2’ 1－b’ Mn 4＋ b’ F d’ The absolute value of the charge of the ion, d', satisfies 5 < d' < 7.

6. The light-emitting device according to claim 2, The first phosphor further comprises at least one selected from a second nitride phosphor having a composition represented by formula (1B), a fluoride phosphor having a composition represented by formula (1C), and a fluoride phosphor having a composition different from formula (1C) and represented by formula (1C'). Sr. q That s the t And u N v :I (1B) In equation (1B), q, s, t, u and v satisfy 0≤q<1, 0<s≤1, q+s≤1, 0.9≤t≤1.1, 0.9≤u≤1.1 and 2.5≤v≤3.5 respectively; A c [M 2 1－b Mn 4＋ b F d ] (1C) In equation (1C), A contains elements selected from K. ＋ Li ＋ Na ＋ 、Rb ＋ Cs ＋ and NH4 ＋ At least one of them, M 2 It contains at least one element selected from Group 4 and Group 14, b satisfies 0 < b < 0.2, and c is [M]. 2 1－b Mn 4＋ b F d The absolute value of the charge of the ion, d, satisfies 5 < d < 7; A’ c’ [M 2 ’ 1－b’ Mn 4＋ b’ F d’ ] (1C’) In equation (1C'), A' contains elements selected from K. ＋ Li ＋ Na ＋ 、Rb ＋ Cs ＋ and NH4 ＋ At least one of them, M 2 'Contains at least one element selected from Group 4, Group 13, and Group 14, b' satisfies 0 < b' < 0.2, and c' is [M 2’ 1－b’ Mn 4＋ b’ F d’ The absolute value of the charge of the ion, d', satisfies 5 < d' < 7.

7. The light-emitting device according to claim 1, For the first phosphor, the full width at half maximum (FWHM) of the emission peak with the emission peak wavelength in the emission spectrum of the first phosphor is in the range of 3 nm or more and 120 nm or less.

8. The light-emitting device according to claim 2, For the first phosphor, the full width at half maximum (FWHM) of the emission peak with the emission peak wavelength in the emission spectrum of the first phosphor is in the range of 3 nm or more and 120 nm or less.

9. The light-emitting device according to claim 3, The second phosphor comprises at least one selected from rare-earth aluminate phosphors having a composition represented by formula (2A) below and a third nitride phosphor having a composition represented by formula (2B) below. Ln 1 3(Al 1－a Ga a ) 5O 12 :Ce (2A) In equation (2A), Ln 1 It is at least one element selected from Y, Gd, Tb and Lu, where a satisfies 0≤a≤0.5; to w In 2 x Si6N y :What z (2B) In equation (2B), Ln 2 It must contain at least one selected from Y and Gd and at least one selected from Sc and Lu, or Ln 2 It must contain at least one selected from Y and Gd and exclude Sc and Lu, in the composition of 1 mole of Ln 2 When the element is set to 100 mol%, Ln 2 The total amount of Y and Gd contained therein is more than 90 mol%, and w, x, y and z satisfy 1.2≤w≤2.2, 0.5≤x≤1.2, 10≤y≤12, 0.5≤z≤1.2, 1.80<w+x<2.40, 2.9≤w+x+z≤3.

1.

10. The light-emitting device according to claim 4, The second phosphor comprises at least one selected from rare-earth aluminate phosphors having a composition represented by formula (2A) below and a third nitride phosphor having a composition represented by formula (2B) below. Ln 1 3(Al 1－a Ga a ) 5O 12 :Ce (2A) In equation (2A), Ln 1 It is at least one element selected from Y, Gd, Tb and Lu, where a satisfies 0≤a≤0.5; to w In 2 x Si6N y :What z (2B) In equation (2B), Ln 2 It must contain at least one selected from Y and Gd and at least one selected from Sc and Lu, or Ln 2 It must contain at least one selected from Y and Gd and exclude Sc and Lu, in the composition of 1 mole of Ln 2 When the element is set to 100 mol%, Ln 2 The total amount of Y and Gd contained therein is more than 90 mol%, and w, x, y and z satisfy 1.2≤w≤2.2, 0.5≤x≤1.2, 10≤y≤12, 0.5≤z≤1.2, 1.80<w+x<2.40, 2.9≤w+x+z≤3.

1.

11. The light-emitting device according to claim 3, For the second phosphor, the full width at half maximum (FWHM) of the emission peak with the emission peak wavelength in the emission spectrum of the second phosphor is in the range of 20 nm or more and 125 nm or less.

12. The light-emitting device according to claim 4, For the second phosphor, the full width at half maximum (FWHM) of the emission peak with the emission peak wavelength in the emission spectrum of the second phosphor is in the range of 20 nm or more and 125 nm or less.

13. The light-emitting device according to claim 3, The content of the first phosphor is in the range of 5% by mass or more and 95% by mass or less relative to the total amount of the first phosphor and the second phosphor.

14. The light-emitting device according to claim 4, The content of the first phosphor is in the range of 5% by mass or more and 95% by mass or less relative to the total amount of the first phosphor and the second phosphor.

15. The light-emitting device according to claim 1, It emits light with a color deviation (Duv) of more than -0.008 and less than +0.008 relative to the blackbody radiation trajectory.

16. The light-emitting device according to claim 2, It emits light with a color deviation (Duv) of more than -0.008 and less than +0.008 relative to the blackbody radiation trajectory.

17. The light-emitting device according to claim 1, The second radiance, which is in the range of 650 nm to 750 nm, is less than 50% of the first radiance, which is in the range of 400 nm to 750 nm.

18. The light-emitting device according to claim 2, The second radiance, which is in the range of 650 nm to 750 nm, is less than 50% of the first radiance, which is in the range of 400 nm to 750 nm.

19. A lamp comprising the light-emitting device according to any one of claims 1 to 18.

20. A street light comprising the light-emitting device according to any one of claims 1 to 18.

Images