CN117704310A

CN117704310A - Light-emitting device for vehicle and lighting device for vehicle

Info

Publication number: CN117704310A
Application number: CN202311185862.1A
Authority: CN
Inventors: 后藤雄哉; 梶川幸治; 佐藤裕二
Original assignee: Nichia Corp
Current assignee: Nichia Corp
Priority date: 2022-09-15
Filing date: 2023-09-13
Publication date: 2024-03-15
Also published as: JP2024042652A

Abstract

Provided are a light emitting device for a vehicle and a lighting device for a vehicle. A light-emitting device for a vehicle is provided with: a light-emitting element having a light-emission peak wavelength in a range of 400nm to 510 nm; a fluorescent member including a first fluorescent material that is excited by light emitted from the light emitting element and emits light having a light emission peak wavelength in a range of 480nm to 530nm, and a second fluorescent material that is excited by light emitted from the light emitting element and emits light having a light emission peak wavelength in a range of 540nm to 600 nm; in chromaticity coordinates of the CIE1931 chromaticity diagram, (0.278,0.332) is defined as a first L point, (0.468,0.458) is defined as a second L point, (0.426,0.498) is defined as a third L point, and (0.247,0.362) is defined as a fourth L point, and the vehicle light-emitting device emits light in a region AL defined by a straight line connecting the first L point and the second L point, a straight line connecting the second L point and the third L point, a straight line connecting the third L point and the fourth L point, and a straight line connecting the fourth L point and the first L point.

Description

Light-emitting device for vehicle and lighting device for vehicle

Technical Field

The present invention relates to a vehicle light emitting device and a vehicle lighting device.

Background

The automobile must be provided with a brake light (stop light, brake light), a direction indicator (turn signal light, direction light), a tail light (rear tail light), a back light (back light), and a rear reflector (reflective reflector) at the rear of the automobile body, and standards for the light, the color of the reflected light, the brightness, and the like are defined. These various lamps are integrated into one unit and mounted to the vehicle body as a pair of left and right rear combination lamps. A general back combination lamp uses a vehicle lighting device that emits light of two or three colors, which is at least one of red for a brake lamp and a tail lamp and amber (orange) for a direction indicator and white for a back lamp, in a partitioned area. In addition, the rear combination lamp may be designed to be a single design by color matching and shape matching of light colors as an ornament of an automobile.

In such a lighting device for a vehicle, a light emitting device including a Light Emitting Diode (LED) or the like is housed as a light source in a base material (housing) having a reflective film provided on the inner surface thereof, and an opening of the base material is covered with a plate-like cover (outer lens) made of a transparent resin or the like as a light irradiation surface. The lighting device includes a rear reflector that reflects light in red, and thus includes a red cover made of a transparent resin or the like colored in red with a pigment, a transparent cover that is combined with a light emitting device that emits white light and serves as a region of a white lamp, or further includes an orange cover in a region of an orange lamp. Therefore, the cover of the lighting device is made of a plate material of two colors of transparent and red or three colors of orange added thereto, and is assembled to the base material, respectively, or is made of a single plate material of which the color is divided by integrally molding a resin material. If the cover for covering the surface is made of two or more kinds of plates, the shape of the parts constituting the cover may be complicated and the number of parts may be increased depending on the design, and the mold for forming the cover may be complicated, which may make it difficult to form the cover. In addition, when the cover has different functions depending on the position of the cover, for example, the degree of freedom in design is limited when the cover is mounted on a vehicle.

Patent document 1 discloses a vehicle lamp including three organic EL display device light sources that emit light of, for example, amber (orange), red, and white, and covered with a lens cover provided with a lens portion that transmits light of the organic EL display device light sources and a recursive reflection portion that colors a part of the light into a color different from that of the lens portion.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2002-133915

Disclosure of Invention

Technical problem to be solved by the invention

An object of one embodiment of the present invention is to provide a vehicle lighting device which has a cover made of one color filter capable of covering the entire irradiation surface and which has a high degree of freedom in design, and which is provided with a vehicle lighting device which obtains a predetermined white light after passing through a color filter and suppresses a drop in a light flux after passing through the color filter.

Technical scheme for solving technical problems

A first aspect is a light-emitting device for a vehicle, comprising: a light-emitting element having a light-emission peak wavelength in a range of 400nm to 510 nm; a fluorescent member including a first fluorescent material that is excited by light emitted from the light emitting element and emits light having a light emission peak wavelength in a range of 480nm to 530nm, and a second fluorescent material that is excited by light emitted from the light emitting element and emits light having a light emission peak wavelength in a range of 540nm to 600 nm; in the xy chromaticity coordinates of the CIE1931 chromaticity diagram, the chromaticity coordinates (xL, yL) are defined as a first L point, (xl=0.278, yl=0.332), a second L point, (xl=0.468, yl=0.458), a third L point, (xl=0.426, yl=0.498), and a fourth L point, (xl=0.247, yl=0.362), and the vehicle light-emitting device emits light in an area AL defined by a first L straight line connecting the first L point and the second L point, a second L straight line connecting the second L point and the third L point, a third L straight line connecting the third L point and the fourth L straight line connecting the fourth L point and the first L point.

A second aspect is a lighting device for a vehicle, comprising: the light-emitting device for a vehicle; a color filter provided at a position where light emitted from the vehicle light-emitting device is incident, wherein a maximum transmittance of light in a range of 410nm to 480nm is more than 50% and 90% or less, a minimum transmittance of light in a range of 500nm to 550nm is more than 20% and 70% or less, and a transmittance of light in a range of 600nm to 730nm is 80% or more; white light is emitted from the vehicle light-emitting device and transmitted through the color filter.

A third aspect is a vehicle lighting device including the vehicle light-emitting device and a color filter that transmits light emitted from the vehicle light-emitting device and emits white light, wherein in a graph Gx in which a minimum transmittance T in a range of 500nm to 550nm of the color filter is taken as a horizontal axis, an x coordinate of light emitted from the vehicle light-emitting device before passing through the color filter in chromaticity coordinates of a CIE1931 chromaticity diagram is taken as an xL value, an x coordinate of white light after passing through the color filter is taken as an xW value, a difference obtained by subtracting the xL value from the xW value is taken as Δx, and Δx is taken as a vertical axis, Δx satisfies the following formula (Ix),

In a graph Gy having a minimum transmittance T in a range of 500nm to 550nm inclusive of the color filter, a y-coordinate of emission of a vehicle light emitting device before passing through the color filter among chromaticity coordinates of a CIE1931 chromaticity diagram, a y-coordinate of white light after passing through the color filter, a y-coordinate of the white light after passing through the color filter, and a difference obtained by subtracting the y-L value from the y-W value, respectively, as Δy and a vertical axis, Δy satisfies the following formula (Iy),

Δx＝S ¹ ×T+I ¹ (Ix)，

(in the graph Gx, S in the formula (Ix) ¹ Represents the slope, I ¹ Representing the intercept, S ¹ 、I ¹ T respectively satisfies-0.003.ltoreq.S ¹ ≤0、0.050≤I ¹ ≤0.161、20＜T≤70)；

Δy＝S ² ×T×I ² (Iy)，

(in the graph Gy, S in the formula (Iy) ² Represents the slope, I ² Representing the intercept, S ² 、I ² T respectively satisfies 0.ltoreq.S ² ≤0.002、－0.114≤I ² ≤－0.030、20＜T≤70)。

Effects of the invention

According to one aspect of the present invention, it is possible to provide a vehicle lighting device having a cover formed of one color filter capable of covering the entire irradiation surface and having a high degree of freedom in design, and a vehicle lighting device which obtains a predetermined white light after passing through the color filter and suppresses a drop in light flux after passing through the color filter.

Drawings

Fig. 1 is a diagram showing an area AL of emission colors of a light emitting device for a vehicle in a CIE1931 chromaticity diagram.

Fig. 2 is a diagram showing a white region Ws defined by JISD5500 or ECE in the CIE1931 chromaticity diagram.

Fig. 3 is a schematic cross-sectional view showing a first example of the vehicular light-emitting device.

Fig. 4 is a schematic cross-sectional view showing a second example of the vehicular light-emitting device.

Fig. 5 is a diagram showing a CIE1931 chromaticity diagram showing a white light region AW emitted from a vehicle lighting device and a white light region Ws defined by JISD5500 or ECE.

Fig. 6 is an external view schematically showing a state in which the vehicle lighting device is attached to the vehicle body.

Fig. 7 is a schematic cross-sectional view showing a partial structure of the lighting device for a vehicle in a low-magnification manner.

Fig. 8 is a diagram showing a CIE1931 chromaticity diagram showing a region AL of light emitted from the vehicle light emitting device, a region AW of white light emitted from the vehicle light emitting device, and a white region Ws defined by JISD5500 or ECE.

Fig. 9 is a diagram showing the transmission spectra of the color filters 1 to 3.

Fig. 10 is a diagram showing chromaticity coordinates (xL, yL) of light emitted from the vehicle light emitting device according to example 1 before passing through the color filter, chromaticity coordinates (xW, yW) of white light from the vehicle lighting device after passing through the color filter, chromaticity coordinates (xL, yL) of light from the vehicle light emitting device according to comparative example 1 before passing through the color filter, and chromaticity coordinates (xW, yW) of white light from the vehicle lighting device after passing through the color filter in a CIE1931 chromaticity diagram.

Fig. 11 is a diagram showing chromaticity coordinates (xL, yL) of light transmitted through the color filters of the vehicle light emitting device according to examples 2 and 4 and chromaticity coordinates (xW, yW) of white light transmitted through the color filters of the vehicle lighting device in the CIE1931 chromaticity diagram.

Fig. 12 is a diagram showing chromaticity coordinates (xL, yL) of light transmitted through the light emitting device for a vehicle according to examples 3 and 5 before the color filter and chromaticity coordinates (xW, yW) of white light transmitted through the light emitting device for a vehicle after the color filter in the CIE1931 chromaticity diagram.

Fig. 13 is a diagram showing chromaticity coordinates (xL, yL) of the vehicle light emitting device according to examples 6 and 7 before passing through the color filter, chromaticity coordinates (xW, yW) of white light of the vehicle lighting device after passing through the color filter, chromaticity coordinates (xL, yL) of light of the vehicle light emitting device according to comparative example 2 before passing through the color filter, and chromaticity coordinates (xW, yW) of white light of the vehicle lighting device after passing through the color filter in a CIE1931 chromaticity diagram.

Fig. 14 is a graph showing two primary straight lines of the color filters 1 and 2 obtained from the xL value and the xW value of the chromaticity of the emission light of the vehicle light-emitting device before passing through the color filter, and the xW value of the chromaticity coordinates of the white light of the vehicle light-emitting device after passing through the color filter, and the difference Δx obtained by subtracting the xL value of the chromaticity of the emission light of the vehicle light-emitting device before passing through the color filter, from the xW value, as the vertical axis, for examples 1 to 7.

Fig. 15 is a graph in which four points of the maximum value and the minimum value of Δx at the minimum transmittance T (%) of the color filter obtained by the equation shown in fig. 14 are plotted on a graph Gx in which the minimum transmittance T (%) of examples 1 to 7 is taken as the horizontal axis and the difference Δx obtained by subtracting the xL value of the light emission of the vehicle light emitting device before the color filter from the xW value of the white light of the vehicle light emitting device after the color filter is transmitted is taken as the vertical axis, and four straight lines derived from the plotted four points are shown.

Fig. 16 is a graph showing two primary straight lines of the color filters 1 and 2 obtained from the y value and the y value of the chromaticity of the emission light of the vehicle light-emitting device and the vehicle lighting device according to examples 1 to 7, in which the y value of the chromaticity coordinate of the chromaticity of the white light of the vehicle lighting device after passing through the color filter is taken as the horizontal axis, and the difference Δy obtained by subtracting the y value of the chromaticity of the emission light of the vehicle light-emitting device before passing through the color filter from the y value is taken as the vertical axis for examples 1 to 7.

Fig. 17 is a graph showing four points of maximum and minimum values of Δy at the minimum transmittance T (%) of the color filter obtained by the equation shown in fig. 16 and showing four primary straight lines derived from the four points drawn, in the graph Gy of examples 1 to 7, in which the minimum transmittance T (%) of the color filter is in the range of 500nm to 550nm inclusive, and the difference Δy obtained by subtracting the chromaticity yL value of the emitted light of the vehicle light-emitting device before passing through the color filter from the yW value of the chromaticity coordinates of the white light emitted from the vehicle light-emitting device after passing through the color filter is taken as the vertical axis.

Fig. 18 is a graph Gx in which a minimum transmittance T (%) in a range of 500nm to 550nm inclusive of the color filter is plotted on the horizontal axis and a difference Δx obtained by subtracting the xL value of the light emission before passing through the color filter from the xW value of the white light after passing through the color filter is plotted on the vertical axis, and is a graph showing an approximate straight line derived from points at which the light emission of the vehicle light emitting device and the vehicle light emitting device according to examples 1 to 7 is plotted.

Fig. 19 is a graph showing a substantially straight line derived from points at which light emission of the vehicle light-emitting device and the sample of the vehicle lighting device according to examples 1 to 7 is plotted, in a graph Gy in which a minimum transmittance T (%) of the color filter in a range of 500nm to 550nm inclusive is plotted on the horizontal axis and a difference Δy obtained by subtracting the yL value of light emission before passing through the color filter from the yW value of white light after passing through the color filter is plotted on the vertical axis.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following embodiments are illustrative of a vehicle light emitting device and a vehicle lighting device for embodying the technical idea of the present invention, and the present invention is not limited to the vehicle light emitting device and the vehicle lighting device described below. In addition, the components shown in the claims are by no means limited to the components of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention to the specific description unless otherwise specified, but are merely illustrative examples. The relationship between Yan Seming and chromaticity coordinates, the relationship between the wavelength range of light and the color name of monochromatic light, and the like comply with JIS Z8110. In the present specification, when a plurality of substances conforming to each component are present in the composition, the content of each component in the composition indicates the total amount of the plurality of substances present in the composition unless otherwise specified. In the present specification, the full width at half maximum means a wavelength width at which the emission intensity in the emission spectrum becomes 50% with respect to the emission peak wavelength at which the emission intensity is the maximum. The components shown in the following drawings may be exaggerated in size and positional relationship, and the shape may be simplified. In the following description, the same names and reference numerals indicate the same or similar components in principle.

A light-emitting device for a vehicle is provided with: a light-emitting element having a light-emission peak wavelength in a range of 400nm to 510 nm; a fluorescent member including a first fluorescent material that emits light having an emission peak wavelength in a range of 480nm to 530nm, which is excited by light emitted from the light emitting element, and a second fluorescent material that emits light having an emission peak wavelength in a range of 540nm to 600nm, which is excited by light emitted from the light emitting element; in the CIE1931 chromaticity diagram, regarding chromaticity coordinates (xL, yL), let (xl=0.278, yl=0.332) be the first L point, let (xl=0.468, yl=0.458) be the second L point, let (xl=0.426, yl=0.498) be the third L point, let (xl=0.247, yl=0.362) be the fourth L point, and the vehicle light-emitting device emits light in a region AL defined by the first L line connecting the first L point and the second L point, the second L line connecting the second L point and the third L point, the third L line connecting the third L point and the fourth L line connecting the fourth L point and the first L point. Fig. 1 is a diagram showing an area AL of light emitted from a light emitting device for a vehicle in xy chromaticity coordinates of a CIE1931 chromaticity diagram. Hereinafter, the "CIE1931 chromaticity diagram" may be referred to as a "chromaticity diagram", and the "chromaticity coordinates of the CIE1931 chromaticity diagram" may be referred to as "chromaticity coordinates". The light in the area AL in the chromaticity diagram exhibits a bluish-green color which is white.

The vehicle light-emitting device transmits a color filter to emit light in a white light range specified by JISD5500 or in a white light range specified by ECE (institute of european economy). In addition, the vehicle lighting device using the vehicle lighting device emits light in which the decline of the light flux is suppressed even after the light passes through the color filter. The white region specified by JISD5500 is a chromaticity range of 0.500.gtoreq.x.gtoreq.0.310, y.gtoreq.0.150+0.640 x, y.gtoreq.0.050+0.750 x, and 0.440.gtoreq.y.gtoreq.0.382 in chromaticity coordinates of JIS Z8701. Fig. 2 is a diagram showing a white region Ws defined by JISD5500 or ECE in chromaticity coordinates of the chromaticity diagram. The chromaticity coordinates of JIS Z8701 are the same as those of the color system recommended in CIE1931 (see JIS Z8701).

An example of a light emitting device for a vehicle will be described with reference to the drawings. Fig. 3 is a schematic cross-sectional view showing a first example of the vehicular light-emitting device.

As shown in fig. 3, the vehicle light-emitting device 11 includes: a light-emitting element 41 having a light emission peak wavelength in a range of 400nm to 510 nm; the fluorescent member 51 includes a first fluorescent material 71 and a second fluorescent material 72, wherein the first fluorescent material 71 is excited by light emitted from the light emitting element 41 to emit light having an emission peak wavelength in a range of 480nm to 530nm, and the second fluorescent material 72 is excited by light emitted from the light emitting element 41 to emit light having an emission peak wavelength in a range of 540nm to 600 nm. The phosphor 70 includes a first phosphor 71 and a second phosphor 72.

The vehicle light-emitting device 11 includes a molded body 6, a light-emitting element 41, and a fluorescent member 51. The molded body 6 is formed by integrally molding the first lead 20, the second lead 30, and the resin portion 61 including a thermoplastic resin or a thermosetting resin. The shaped body 6 is sometimes referred to as a package 6. The molded body 6 has a recess having a bottom surface and side surfaces, and the light emitting element 41 is mounted on the bottom surface of the recess. The light emitting element 41 has a pair of positive and negative electrodes electrically connected to the first lead 20 and the second lead 30 via the lead 60, respectively. The light emitting element 41 is covered with a fluorescent member 51. The fluorescent member 51 includes a fluorescent material 70 and a light-transmitting material, and the fluorescent material 70 includes a first fluorescent material 71 and a second fluorescent material 72. The fluorescent member 51 also has a function as a sealing member for covering the light emitting element 41 and the fluorescent body 70 in the concave portion of the molded body 6. The vehicle light-emitting device 11 can be caused to emit light by receiving supply of electric power from the outside through the first lead 20 and the second lead 30 connected to the positive and negative electrodes of the light-emitting element 41.

The light-emitting element has a light-emission peak wavelength in a range of 400nm to 510 nm. The light-emitting element preferably has a light-emission peak wavelength in a range of 410nm to 480nm, more preferably Has a light emission peak wavelength in a range of 420nm to 460 nm. The light emitting element can use, for example, a Light Emitting Diode (LED) or a Laser Diode (LD). The light emitting element can use, for example, an LED chip. The light-emitting element can use a light-emitting element made of In _X Al _Y Ga _1－X－Y N (0.ltoreq.X, 0.ltoreq.Y, X+Y.ltoreq.1). The nitride semiconductor can select various light-emitting wavelengths by the material of the semiconductor layer and the mixed crystal thereof. The shape, size, mounting method (flip chip, wire bonding) to a molded body (also referred to as "molded body") containing a lead (hereinafter referred to as "package") and the like are not particularly limited as long as the light-emitting element emits the amount of light required for the light-emitting device for a vehicle.

The first phosphor preferably contains at least one phosphor selected from the group consisting of a silicate phosphor having a composition represented by the following formula (1 a), a first rare earth aluminate phosphor having a composition represented by the following formula (1 b), and a beta-sialon phosphor having a composition represented by the following formula (1 c).

(Ca,Sr,Ba) ₈ MgSi ₄ O ₁₆ (F,Cl,Br) ₂ :Eu(1a)

(Lu,Y,Gd,Tb) ₃ (Al,Ga) ₅ O ₁₂ :Ce(1b)

Si _6－z Al _z O _z N _8－z :Eu(0＜z≤4.2)(1c)

In this specification, a colon (:) in the compositional formula indicating the components of the phosphor indicates before the elements constituting the matrix crystal and the molar ratio thereof, and an activating element is indicated after the colon (:). In the present specification, a plurality of elements described by comma (,) in a formula indicating a component of a phosphor means that at least one element of the plurality of elements is contained in the component, and two or more elements may be contained in combination from the plurality of elements.

The first rare earth aluminate phosphor having a composition represented by the above formula (1 b) and the second rare earth aluminate phosphor having a composition represented by the following formula (2 a) have different compositions, and the first rare earth aluminate phosphor as the first phosphor and the second rare earth aluminate phosphor as the second phosphor are different in rare earth elements contained in the respective compositions, or in the case where the rare earth elements contained in the compositions are the same in the first rare earth aluminate phosphor and the second rare earth aluminate phosphor, the first rare earth aluminate phosphor is different in the content of Ga in the composition.

The second phosphor preferably contains a second rare earth aluminate phosphor having a composition represented by the following formula (2 a).

(Y,Gd,Tb) ₃ Al ₅ O ₁₂ :Ce(2a)

The fluorescent member of the light-emitting device for a vehicle may include a third fluorescent material that emits light having a light emission peak wavelength in a range of 605nm to 670nm by excitation with light emitted from the light-emitting element.

The median particle diameter of the phosphor is preferably in the range of 3 μm to 50 μm, or in the range of 5 μm to 40 μm, or in the range of 8 μm to 35 μm. If the median particle diameter is in the range of 3 μm to 50 μm, light having a desired light beam is easily emitted. The median particle diameter of the phosphor is a median particle diameter on a volume basis, and means a particle diameter corresponding to a volume accumulation of 50% from the small diameter side in a volume-based particle diameter distribution. The particle size distribution of the phosphor was measured by a laser diffraction method using a laser diffraction type particle size distribution measuring device. As described above, the phosphor may include the first phosphor and the second phosphor, or may include a third phosphor described below.

Fig. 4 is a schematic cross-sectional view showing a second example of the vehicular light-emitting device 11. As shown in fig. 4, the fluorescent member 51 is the same as the vehicle light-emitting device 11 shown in fig. 3 except that the fluorescent member 70 includes a third fluorescent member 73 that is excited by the light emitted from the light-emitting element 41 and has an emission peak wavelength in a range of 605nm to 670 nm. In fig. 4, the same members as those in fig. 3 are denoted by the same reference numerals.

The third phosphor preferably contains at least one phosphor selected from the group consisting of a first nitride phosphor having a composition represented by the following formula (3 a) and a second nitride phosphor having a composition represented by the following formula (3 b).

(Sr,Ca)AlSiN ₃ :Eu(3a)

(Ba,Sr) ₂ Si ₅ N ₈ :Eu(3b)

The fluorescent member may include a fluorescent material and a translucent material, and the fluorescent member may include a fluorescent material that is excited by light emitted from the light emitting element and emits an amount of light within a region AL in the chromaticity diagram from the vehicle light emitting device. Specifically, the amount of the fluorescent material including the first fluorescent material and the second fluorescent material may be in the range of 10 mass parts or more and 250 mass parts or less, may be in the range of 15 mass parts or more and 200 mass parts or less, or may be in the range of 20 mass parts or more and 180 mass parts or less, relative to the mass parts of the light-transmissive material 100. The content of the first phosphor may be in a range of 5 mass% or more and 99 mass% or less, or in a range of 10 mass% or more and 98 mass% or less, or in a range of 20 mass% or more and 97 mass% or less, relative to 100 mass% of the total amount of the phosphors. The total amount of the phosphors may be the sum of the first and second phosphors, if the third phosphor is not included. The phosphor may not include the third phosphor, and the third phosphor may be in a range of 0 mass% or more and 30 mass% or less, may be in a range of 3 mass% or more and 20 mass% or less, or may be in a range of 5 mass% or more and 10 mass% or less, with respect to 100 mass% of the total amount of the phosphor.

The light-transmitting material included in the fluorescent member may be at least one selected from the group consisting of a resin, glass, and an inorganic substance, and the light-transmitting material is preferably a resin. The resin is preferably at least one selected from the group consisting of epoxy resin, silicone resin, phenolic resin, and polyimide resin. The inorganic substance may be at least one selected from the group consisting of aluminum oxide and aluminum nitride. The fluorescent member may contain a filler, a colorant, and a light diffusing material as required, in addition to the fluorescent material and the light transmitting material. Examples of the filler include silicon oxide, barium titanate, titanium oxide, and aluminum oxide. The content of the other components other than the phosphor and the light transmissive material contained in the fluorescent member may be in a range of 0.01 mass part or more and 50 mass parts or less, may be in a range of 0.1 mass part or more and 45 mass parts or less, and may be in a range of 0.5 mass part or more and 40 mass parts or less, based on the total content of the other components, relative to the light transmissive material 100 mass parts.

An example of a method of manufacturing a light-emitting device for a vehicle will be described. For details, reference may be made to the disclosure of, for example, japanese patent application laid-open No. 2010-062272. The method for manufacturing the light-emitting device for a vehicle preferably includes a step of preparing a molded body, a step of disposing a light-emitting element, a step of disposing a fluorescent member composition, and a step of forming a resin package.

In the step of preparing the molded body, a plurality of leads are integrally molded with a thermosetting resin or a thermoplastic resin, and the molded body including the concave portion having the side surface and the bottom surface is prepared.

In the step of disposing the light-emitting element, the light-emitting element is disposed on the bottom surface of the concave portion of the molded body, and positive and negative electrodes of the light-emitting element are connected to the first lead and the second lead via wires.

In the step of disposing the fluorescent member composition, the fluorescent member composition is disposed in the recess of the molded body.

In the resin encapsulation molding step, the fluorescent member composition disposed in the recess of the molded body is cured to form a fluorescent member, and the resin encapsulation is formed to manufacture the light-emitting device for a vehicle. As described above, the light emitting device for a vehicle shown in fig. 3 or 4 can be manufactured.

The light-emitting device for a vehicle is not limited to a package using a molded body including a concave portion having a bottom surface and a side surface, and may be provided with a fluorescent member for covering a light-emitting element mounted on, for example, a flat package (wiring board). In addition, in the light emitting device for a vehicle, for example, a ceramic composite in a plate shape, which is formed by sintering a phosphor and an inorganic material, may be used as the fluorescent member. One embodiment of the light emitting device for a vehicle can be described in, for example, japanese patent application laid-open No. 2020-58695.

A lighting device for a vehicle is provided with: the above-mentioned vehicular light-emitting device; a color filter provided at a position where light emitted from the light-emitting device for a vehicle is incident, wherein the maximum transmittance of light in a range of 410nm to 480nm is more than 50% and 90% or less, the transmittance of light in a range of 500nm to 550nm is more than 20% and 70% or less, and the transmittance of light in a range of 600nm to 730nm is 80% or more; the light emitted from the vehicle light-emitting device transmits through the color filter to emit white light. The color filter may be a color filter having the transmittance in each wavelength range and having red or pink color slightly lighter than red. Light emitted from the vehicle light-emitting device that emits light in the region AL in the chromaticity diagram passes through the color filter having a specific transmittance in each wavelength range, and emits white light. The white light emitted from the vehicle lighting device can emit white light in a white region Ws defined by JISD5500 or ECE in the chromaticity diagram.

In the chromaticity diagram, (xw=0.310, yw=0.300) is preferably set as a first W point, (xw=0.500, yw=0.440) is set as a second W point, (xw=0.500, yw=0426) is set as a third W point, (xw=0.453, yw=0.440) is set as a fourth W point, and (xw=0.310, yw=0.348) is set as a fifth W point, and white light is emitted in an area AW defined by a first W line connecting the first W point and the second W point, a second W line connecting the second W point and the third W point, a third W line connecting the third W point and the fourth W point, a fourth W line connecting the fourth W point and the fifth W point, and a fifth W line connecting the fifth W point and the first W point. Fig. 5 is a diagram showing, in a chromaticity diagram, a white light region AW emitted from a vehicle lighting device and a white light region Ws defined by JISD5500 or ECE. The vehicle lighting device including the vehicle lighting device and the color filter emits white light in a specific region AW within a white region Ws defined by JISD5500 or ECE in the chromaticity diagram after the light emitted from the vehicle lighting device passes through the color filter. The vehicle lighting device can cover the plurality of vehicle light emitting devices with a cover having one color filter or a cover made up of one color filter, and can emit white light in a predetermined white region Ws from one color filter of the vehicle lighting device, thereby improving the degree of freedom of design in the vehicle.

The light flux maintenance ratio of the vehicle lighting device, which represents the ratio of the light flux of the white light transmitted through the color filter to the light flux of the light emitting device for the vehicle before the color filter, is preferably in the range of 40% to 75%. If the light flux maintenance ratio of the vehicle lighting device is in the range of 40% or more and 75% or less, the decrease in the light flux emitted from the vehicle lighting device through the color filter is suppressed, and white light that maintains the light flux is emitted from the vehicle lighting device even though the light flux passes through the color filter. The light flux maintenance ratio of the vehicle lighting device is more preferably in the range of 45% to 70%.

An example of a lighting device for a vehicle will be described with reference to the drawings. Fig. 6 is an external view schematically showing a state in which the vehicle lighting device is attached to the vehicle body. Fig. 7 is a schematic enlarged cross-sectional view showing a partial structure of the vehicle lighting device. Note that, in the cross-sectional view of fig. 7, the description will be given as the upper and lower sides in the same manner as the upper and lower sides in the drawing showing the cross-section of fig. 7 unless otherwise noted.

The lighting device 10 for a vehicle includes a housing 3 and a color filter 2 covering an opening of the housing 3. The case 3 is provided with the vehicle light-emitting device 11 that emits white light after passing through the color filter 2. The vehicle light-emitting device 11 that emits white light is referred to as a first vehicle light-emitting device 11. As described above, the first vehicle light-emitting device 11 includes the light-emitting element 41, the package 6, and the fluorescent member 51 including the fluorescent material including the first fluorescent material and the second fluorescent material. The light emitting element 41 is also referred to as a first light emitting element 41. The fluorescent member 51 is also referred to as a first fluorescent member 51. The first vehicular light-emitting device 11 emits light L emitted from the first light-emitting element 41 _B1 A first fluorescent member 51 is provided at the incident position to emit light L from the light emitting element 41 _B1 Wavelength-converted by the phosphor contained in the first fluorescent member 51, light L, which is light within the region AL in chromaticity coordinates of the chromaticity diagram, is emitted _G . Light emitting device for first vehicleLight L emitted by 11 in the chromaticity coordinates of the chromaticity diagram in the region AL _G White light L, which is a region AW in chromaticity coordinates of the chromaticity diagram, is emitted from the vehicle lighting device 10 through the color filter 2 _W 。

The vehicle lighting device preferably includes the second vehicle lighting device 12 and the third vehicle lighting device 13 together with the first vehicle lighting device 11. The second vehicular light-emitting device 12 includes a second light-emitting element 42, a package 6, and a second fluorescent member 52 including a fluorescent material, and emits light L emitted from the second light-emitting element 42 _B2 The light L is emitted from the second vehicle light-emitting device 12 by wavelength conversion using the phosphor contained in the second fluorescent member 52 _Y . Light L emitted from second vehicular light-emitting device 12 _Y Orange light L is emitted from the vehicle lighting device 10 through the color filter 2 _A . The third vehicle light-emitting device 13 includes a third light-emitting element 43, a package 6, and a third fluorescent member 53 including a fluorescent material, and emits light L emitted from the third light-emitting element 43 _B3 The light L is emitted from the third vehicle light-emitting device 13 by wavelength conversion using the phosphor contained in the third fluorescent member 53 _Ri . Light L emitted from third vehicle light-emitting device 13 _Ri Red light L is emitted from the vehicle lighting device 10 through the color filter 2 _R . The vehicle lighting device 10 includes at least the first vehicle lighting device 11, and may include either or both of the second vehicle lighting device 12 and the third vehicle lighting device 13. More than two first vehicle light emitting devices 11 may be provided, and no second vehicle light emitting device and/or no third vehicle light emitting device may be provided.

In the lighting device for a vehicle, two symmetrical left and right are used as a group behind the vehicle body. The vehicle lighting device is a rectangular parallelepiped that is long in the vehicle width direction (Y direction in fig. 6 or 7) of the mounted automobile, and is fitted to the vehicle body so that the rear surface of the irradiation surface is exposed. The illumination surface of the vehicle illumination device is divided into three regions in the Y direction, and each region sequentially illuminates white light L from the vehicle width direction center toward the vehicle body side surface _W Red light L _R Orange lightL _A . The vehicle lighting device 10 reflects red light from the color filter 2 covering the entire irradiation surface by using light from the outside. In this specification, orange includes amber.

White light L _W Is the light of the back lamp of the automobile, orange light L _A Is the light of the direction indicator, red light L _R The light of the brake lamp and the tail lamp are respectively specified by JISD 5500. As described above, white light L _W The chromaticity diagram has chromaticity coordinates in the region AW in the region Ws specified by JISD 5500. Orange light L _A The chromaticity coordinate of JIS Z8701 is defined as chromaticity range of 0.429.gtoreq.y.gtoreq.0.398 and z.gtoreq.0.007. Red light L _R The chromaticity coordinate of JIS Z8701 is defined as a chromaticity range in which y is 0.335 or less and Z is 0.008 or less. The light reflected by the irradiation surface of the vehicle lighting device is preferably defined as light color and red light L _R The same chromaticity range.

The second light-emitting element and the third light-emitting element can use the same light-emitting element as the first light-emitting element.

The phosphor contained in the second fluorescent member preferably has a light emission peak wavelength in a range of 550nm to 630 nm. The phosphor contained in the second fluorescent member preferably has a light emission peak wavelength of 560nm or more, more preferably 570nm or more, and still more preferably 600nm or less. Examples of such a phosphor include yttrium-aluminum-garnet phosphor (YAG phosphor), lutetium-aluminum-garnet phosphor, terbium-aluminum-garnet phosphor, and oxide phosphor such as garnet phosphor (Ba, sr) in which a part of these components is substituted ₂ Si ₅ N ₈ Eu, and the like. The phosphor contained in the second fluorescent member may contain a phosphor having the same composition as the phosphor contained in the first fluorescent member as long as the phosphor has a light emission peak wavelength in a range of 550nm to 630 nm. The second vehicle light-emitting device can be described in, for example, japanese patent application laid-open No. 2019-133794.

The phosphor contained in the third fluorescent member is preferably contained inThe light emission peak wavelength is in a range of 600nm to 700 nm. The phosphor contained in the third fluorescent member preferably has a light emission peak wavelength of 610nm or more, and more preferably has a light emission peak wavelength of 630nm or more. Examples of such a phosphor include CaAlSiN ₃ Eu (CASN phosphor), (Ca, sr) AlSiN ₃ :Eu、(Ca,Sr) ₃ Si ₅ N ₈ :Eu、SrLiAl ₃ N ₄ :Eu、(Ba,Sr) ₂ Si ₅ N ₈ Eu-like nitride phosphor, ca _u (Si,Al) ₁₂ (O,N) ₁₆ Eu (here, 0 < u.ltoreq.2.0). The third vehicle light-emitting device can be described in, for example, japanese patent application laid-open No. 2019-133794.

The color filters are provided at positions where light emitted from the first, second, and third vehicle light emitting devices 11, 12, 13 is incident. The color filter functions as a cover of the vehicle lighting device, that is, as a so-called outer lens of the vehicle lamp, and is provided to impart a function as a reflector to at least a part of the irradiation surface of the vehicle lighting device. If light is incident to the color filter from the outside, the color filter reflects red light and has a function as a reflector.

The maximum transmittance of light in the range of 410nm to 480nm of the color filter is more than 50% and 90% or less, the minimum transmittance of light in the range of 500nm to 550nm is more than 20% and 70% or less, and the transmittance of light in the range of 600nm to 730nm is 80% or more. The color filter suppresses the first light L emitted from the first vehicle light-emitting device 11 by having a maximum transmittance of light in the range of 410nm to 480nm inclusive of more than 50% and 90% or less and a transmittance of light in the range of 500nm to 550nm inclusive of more than 20% and 70% or less _G The light flux of (2) is allowed to pass through the color filter, and white light of the region AW included in the predetermined white region Ws in the chromaticity diagram is emitted.

The minimum transmittance T of light in the range of 500nm to 550nm inclusive of the color filter is in the range of more than 20% and 70% inclusive (20 < T.ltoreq.70), may be in the range of 25% to 65% inclusive (25.ltoreq.T.ltoreq.65), may be in the range of 28% to 60% inclusive, may be in the range of 30% to 60% inclusive (30.ltoreq.T.ltoreq.60), and may be in the range of 30% to 55% inclusive (30.ltoreq.T.ltoreq.55).

The color filter has a transmittance of 80% or more in a range of 600nm to 730nm, and can emit orange light L from the second vehicle light-emitting device while having a function as a reflector for reflecting red light _A Red light L emitted from third vehicle light-emitting device _R And (3) transmitting. The vehicle lighting device can emit white light L, which is light for a back light, which maintains a high light flux, from one color filter having a function as a reflector _W Orange light L as light for direction indicator _A Light for brake and/or tail lamps, i.e. red light L _R The degree of freedom of design can be improved. The transmittance of light in the range of 600nm to 730nm of the color filter may be 85% or more or 100% or less.

As the color filter, a color filter formed of a resin having a desired strength and transparent such as an acrylic resin or a polycarbonate resin colored with a red pigment such as an azo compound, a cyanine compound, a perylene compound or a dioxazine compound can be used. The color filter also has a function as an external lens, which is also called an external lens, but may have a lens function or may not have a lens function and directly pass light. The color filter may have a back surface (inner surface) or a front surface formed with a concave-convex (lens cut portion, microprism) so that at least a part of the region becomes a recursive reflector.

The housing is a case with an opening on the irradiation surface, and constitutes an exterior body of the lighting device for a vehicle. The case accommodates the first vehicle light-emitting device, the second vehicle light-emitting device, and the third vehicle light-emitting device, and a color filter is disposed so as to cover the opening portion, and the color filter is supported. The case is preferably a light reflector having a reflecting surface on an inner surface. With such a case, the color filter is oriented from the first, second, and third vehicle light emitting devicesEmits emergent light L _G 、L _y 、L _Ri White light L is emitted from a vehicle lighting device _W Orange light L _A Red light L _R Is emitted from the rear of the vehicle so as to expand to a predetermined angle. The case preferably has a structure in which the first, second, and third vehicle light emitting devices are detachable, and the vehicle light emitting devices can be replaced individually. The intervals (pitches) when the first vehicle light-emitting device, the second vehicle light-emitting device, and the third vehicle light-emitting device are arranged on the housing may be different. A spacer may be provided between the respective vehicle light emitting devices. The vehicle lighting device is not limited to a vehicle lighting device using a molded body having a concave portion, and a vehicle lighting device having a fluorescent member formed, for example, as a dome shape may be used, or a vehicle lighting device using a ceramic composite formed by sintering a fluorescent material and an inorganic material, for example, in a plate shape, may be used as a fluorescent member.

Fig. 8 is a diagram showing, in a chromaticity diagram, a region AL of light emitted from a first vehicle light-emitting device, which is a vehicle light-emitting device that emits white light through a color filter, a region AW of white light emitted from a vehicle lighting device through a color filter, and a white region Ws defined by JISD5500 or ECE. If the light in the area AL is emitted from the first vehicle light-emitting device, and the light emitted from the first vehicle light-emitting device is transmitted through the color filter and the white light in the area AW is emitted from the vehicle lighting device, even if the color filter having a function as a reflector is transmitted, it is possible to suppress a decrease in the luminous flux of the light emitted from the first vehicle light-emitting device, and the white light maintaining the luminous flux is emitted from the vehicle lighting device, and the degree of freedom in designing the vehicle lighting device is improved.

The vehicle lighting device preferably has a minimum transmittance T (%) in a range of 500nm to 550nm inclusive of the color filter as a horizontal axis, an x-coordinate of light emission of the vehicle lighting device before passing through the color filter as an xL value, an x-coordinate of white light after passing through the color filter as an xW value, a difference obtained by subtracting the xL value from the xW value as Δx, and a graph Gx having Δx as a vertical axis, wherein Δx satisfies the following expression (Ix), and a minimum transmittance T (%) in a range of 500nm to 550nm inclusive of the color filter as a horizontal axis, a y-coordinate of light emission of the vehicle lighting device before passing through the color filter as a yL value, a y-coordinate of white light after passing through the color filter as a yW value, a difference obtained by subtracting the yL value from the yW value as Δy, and Gy as a vertical axis, among the chromaticity coordinates of the chromaticity diagram. The color filter preferably has a maximum transmittance of light in a range of 410nm to 480nm of more than 50% and 90% or less, and a minimum transmittance of light in a range of 500nm to 550nm of more than 20% and 70% or less, and a transmittance of light in a range of 600nm to 730nm of more than 80%.

Δx＝S ¹ ×T+I ¹ (Ix)

(in the graph Gx, S in the formula (Ix) ¹ Represents the slope, I ¹ Representing the intercept, S ¹ 、I ¹ T respectively satisfies-0.003.ltoreq.S ¹ ≤0、0.050≤I ¹ ≤0.161、20＜T≤70)

Δy＝S ² ×T×I ² (Iy)

(in the graph Gy, S in the formula (Iy) ² Represents the slope, I ² Representing the intercept, S ² 、I ² T respectively satisfies 0.ltoreq.S ² ≤0.002、－0.114≤I ² ≤－0.030、20＜T≤70)

Considering the minimum transmittance T in the range of 500nm to 550nm of the color filter, if the difference Δx between the xW value of the white light after passing through the color filter and the xL value of the light emission of the first vehicular light-emitting device before passing through the color filter satisfies the expression (Ix) and the difference Δy between the yW value of the white light after passing through the color filter and the yL value of the light emission of the first vehicular light-emitting device before passing through the color filter satisfies the expression (Iy), the white light of the specific region AW in the white region Ws defined by JISD5500 or ECE in which the decrease of the light flux is suppressed is also emitted from the vehicular lighting device after passing through the color filter, and therefore, the degree of freedom in designing the vehicular lighting device that can be used as a rear combination lamp of a vehicle body can be improved.

The vehicle lighting device preferably emits white light in a range of Δx of 0.025 or more and 0.085 or less in the formula (Ix) and in a range of Δy of-0.055 or more and-0.005 or less in the formula (Iy). If Δx in the formula (Ix) is in the range of 0.025 or more and 0.085 or less and Δy in the formula (Iy) is in the range of-0.055 or more and-0.005 or less, a color filter having a minimum transmittance in the range of 500nm or more and 550nm or less exceeding 20% and 70% or less can be used, and the decrease in the light flux of the light emitted from the vehicle light-emitting device can be suppressed, and white light in the white region Ws defined by JISD5500 or ECE can be emitted from the vehicle light-emitting device.

S in formula (Ix) ¹ 、I ¹ And Δx, S in formula (Iy) ² 、I ² Each numerical range of Δy can be measured using a vehicle lighting device using at least two or more color filters having different minimum transmittance T in a range of 500nm to 550 nm. The vehicle lighting device can emit white light satisfying the formulas (Ix) and (Iy), and can emit white light within the white region Ws defined by JISD5500 or ECE while maintaining the luminous flux of the light emitted from the first vehicle lighting device.

Embodiments of the present invention include the following light emitting device for a vehicle and lighting device for a vehicle.

[ 1] A light-emitting device for a vehicle, comprising:

a light-emitting element having a light-emission peak wavelength in a range of 400nm to 510 nm;

a fluorescent member including a first fluorescent material that is excited by light emitted from the light emitting element and emits light having a light emission peak wavelength in a range of 480nm to 530nm, and a second fluorescent material that is excited by light emitted from the light emitting element and emits light having a light emission peak wavelength in a range of 540nm to 600 nm;

in the xy chromaticity coordinates of the CIE1931 chromaticity diagram, the chromaticity coordinates (xL, yL) are defined as a first L point, (xl=0.278, yl=0.332), a second L point, (xl=0.468, yl=0.458), a third L point, (xl=0.426, yl=0.498), and a fourth L point, (xl=0.247, yl=0.362), and the vehicle light-emitting device emits light in an area AL defined by a first L straight line connecting the first L point and the second L point, a second L straight line connecting the second L point and the third L point, a third L straight line connecting the third L point and the fourth L straight line connecting the fourth L point and the first L point.

[ 2] the vehicular light-emitting device according to item 1,

the first phosphor contains at least one phosphor selected from the group consisting of a silicate phosphor having a composition represented by the following formula (1 a), a first rare earth aluminate phosphor having a composition represented by the following formula (1 b), and a beta-sialon phosphor having a composition represented by the following formula (1 c),

(Ca,Sr,Ba) ₈ MgSi ₄ O ₁₆ (F,Cl,Br) ₂ :Eu(1a)；

(Lu,Y,Gd,Tb) ₃ (Al,Ga) ₅ O ₁₂ :Ce(1b)；

Si _6－z Al _z O _z N _8－z :Eu(0＜z≤4.2)(1c)。

[ 3] the vehicular light-emitting device according to item 1 or 2,

the second phosphor comprises a second rare earth aluminate phosphor having a composition represented by the following formula (2 a),

(Y,Gd,Tb) ₃ Al ₅ O ₁₂ :Ce(2a)。

[ 4] the vehicular light-emitting device according to any one of items 1 to 3,

the fluorescent member includes a third fluorescent material that emits light having a light emission peak wavelength in a range of 605nm to 670 nm.

The vehicular light-emitting device according to item 4,

the third phosphor contains at least one phosphor selected from the group consisting of a first nitride phosphor having a composition represented by the following formula (3 a) and a second nitride phosphor having a composition represented by the following formula (3 b),

(Sr,Ca)AlSiN ₃ :Eu(3a)；

(Ba,Sr) ₂ Si ₅ N ₈ :Eu(3b)。

[ 6] A lighting device for a vehicle, comprising: the vehicular light-emitting device according to any one of claims 1 to 5; a color filter provided at a position where light emitted from the vehicle light-emitting device is incident, wherein a maximum transmittance of light in a range of 410nm to 480nm is more than 50% and 90% or less, a minimum transmittance of light in a range of 500nm to 550nm is more than 20% and 70% or less, and a transmittance of light in a range of 600nm to 730nm is 80% or more; white light is emitted from the vehicle light-emitting device and transmitted through the color filter.

The vehicular illumination device according to item 6,

in the xy chromaticity coordinates of the CIE1931 chromaticity diagram, the chromaticity coordinates (xW, yW) are set to a first W point, the (xw=0.310, yw=0.300) is set to a second W point, the (xw=0.500, yw=0.440) is set to a third W point, the (xw=0.453, yw=0.440) is set to a fourth W point, the (xw=0.310, yw=0.348) is set to a fifth W point, and the vehicle lighting device emits an AW region defined by a first W line connecting the first W point and the second W point, a second W line connecting the second W point and the third W point, a third W line connecting the third W point and the fourth W point, a fourth W line connecting the fourth W point and the fifth W point, and a fifth W line connecting the fifth W point and the fifth W point.

[ 8] the lighting device for a vehicle according to item 6 or 7,

a light flux maintenance ratio, which represents a ratio obtained by dividing a light flux of white light transmitted through the color filter by a light flux of light emitted from a vehicle light emitting device before the color filter, is in a range of 40% to 75%.

[ 9] the lighting device for a vehicle according to any one of items 6 to 8,

In a graph Gx having a minimum transmittance T in a range of 500nm to 550nm inclusive of the color filter, an x-coordinate of emission of a vehicle light emitting device before passing through the color filter, among chromaticity coordinates of a CIE1931 chromaticity diagram, is set to an xL value, an x-coordinate of white light after passing through the color filter is set to an xW value, a difference obtained by subtracting the xL value from the xW value is set to Δx, and the Δx is set to a vertical axis, Δx satisfies the following formula (Ix),

Δx＝S ¹ ×T+I ¹ (Ix)，

Δy＝S ² ×T×I ² (Iy)，

The vehicular illumination device according to item 9,

in the formula (Ix), deltax is in a range of 0.025 to 0.085, and in the formula (Iy), deltay is in a range of-0.055 to-0.005.

[ 11] A vehicle lighting device comprising the vehicle light-emitting device according to any one of claims 1 to 5 and a color filter that transmits light emitted from the vehicle light-emitting device to emit white light,

Δx＝S ¹ ×T+I ¹ (Ix)，

Δy＝S ² ×T×I ² (Iy)，

The vehicular illumination device according to item 11,

Examples (example)

Hereinafter, the present invention will be specifically described with reference to examples. The present invention is not limited to these examples.

In the light emitting devices for vehicles of the respective examples and comparative examples, the following first phosphor and second phosphor are used.

First phosphor

As the first phosphor, a silicate phosphor (chlorosilicate) having a component contained in the component formula shown in the formula (1 a), a first rare earth aluminate phosphor (G-LAG) having a component contained in the component formula shown in the formula (1 b), which contains Lu as a rare earth element and Ga in the component, and a β -sialon phosphor (β -sialon) having a component contained in the component formula shown in the formula (1 c) were prepared.

Second phosphor

As the second phosphor, a second rare earth aluminate phosphor (YAG) having a component contained in the component formula shown by the formula (2 a) and containing Y as a rare earth element was prepared.

Third phosphor

As the third phosphor, a nitride phosphor (SCASN) having a component contained in the component formula shown by the formula (3 a) was prepared.

Chromaticity coordinates, emission peak wavelength, full width at half maximum of phosphor

For each phosphor, a quantum efficiency measuring device (QE-2000, manufactured by Otsuka electronics Co., ltd.) was used to irradiate each phosphor with light having an excitation wavelength of 450nm, and the emission spectrum at room temperature (about 25 ℃) was measured, and the xp value and yp value, the emission peak wavelength, and the full width at half maximum in the xy chromaticity coordinates of CIE1931 were measured from each emission spectrum. The results are shown in Table 1.

Median particle diameter of phosphor

For each phosphor, the volume-based particle size distribution of the phosphor was measured by a laser diffraction method using a laser diffraction particle size distribution measuring apparatus (MASTER size 2000, manufactured by MALVERN corporation), and the median particle diameter was taken as the particle diameter corresponding to 50% of the volume accumulation from the small diameter side in the volume-based particle size distribution. The results are shown in Table 1.

TABLE 1

Examples 1 to 5 and comparative example 1

A light emitting device of the embodiment shown in fig. 3 was manufactured.

The light-emitting element 41 used was a light-emitting element 41 in which a nitride semiconductor layer having an emission peak wavelength of 450nm was laminated. The light emitting element 41 has a substantially rectangular shape having a longitudinal direction of about 2mm and a transverse direction of about 3mm in a planar shape, and has a thickness of about 0.7mm.

The first lead 20 and the second lead 30 are integrally molded using an epoxy resin, and a molded body (package) 6 having a resin portion 61 is prepared, and the resin portion 61 includes a recess having a side surface and a bottom surface.

The light emitting element 41 is disposed on the bottom surface of the concave portion of the molded body 6, and positive and negative electrodes of the light emitting element 41 are connected to the first lead 20 and the second lead 30 by wires 60 made of gold (Au).

As the light-transmitting material constituting the fluorescent member 51, silicone resin is used. In the composition for a fluorescent member, the total amount of the first phosphor and the second phosphor, that is, the total amount of the phosphors, was set to the total amount shown in table 3 with respect to the light-transmitting material 100 mass portion, and the mixing ratio (mass%) of the first phosphor and the second phosphor was set to the mixing ratio shown in table 3 with respect to the total amount 100 mass% of the first phosphor and the second phosphor. Next, the prepared fluorescent member composition is filled into the concave portion of the molded body 6. The "-" symbol in table 3 indicates that there is no corresponding entry or value.

The wavelength conversion member composition filled in the concave portion of the molded body 6 was heated at 150 ℃ for 3 hours to be cured, and the package 6 including the fluorescent member 51 including the first fluorescent material 71 and the second fluorescent material 72 was formed, thereby manufacturing the light-emitting device 100 for a vehicle.

Color filter

A color filter 1, a color filter 2, and a color filter 3 having different transmittance at each wavelength are prepared. The color filters 1 to 3 were irradiated with light from the normal direction (incidence angle 0 ℃) of the color filters, and a transmission spectrum having a wavelength of 300nm to 800nm was measured at room temperature (25 ℃ ±5℃) using a spectrophotometer (U-3900, manufactured by Hitachi high technology Co., ltd.). Fig. 9 shows transmission spectra of the color filters 1 to 3. Table 2 shows the maximum transmittance (%) of light in the range of 410nm to 480nm, the minimum transmittance (%) of light in the range of 500nm to 550nm, and the transmittance of light in the range of 600nm to 730nm in each of the color filters 1 to 3. When the transmittance of light of 600nm or more and 730nm or less is 80% or more, the transmittance is expressed as "80 or more".

TABLE 2

Example 6

The intensities at the wavelengths of the emission spectra of the hues of the second phosphor and the third phosphor shown in table 1, which are (x=0.434, y=0.399) in the chromaticity coordinates of the chromaticity diagram, were divided by the transmittance of the color filter 1 at the wavelengths, and the emission spectra of the hues of the color filter 1, which are (x=0.434, y=0.399), were calculated by excitation of the emission of the light emitting element used in the vehicle light emitting device of example 1. The obtained spectrum was subjected to hue prediction using spectrum simulation software (manufactured by Niya chemical industries Co., ltd.) to obtain a spectrum having (x=0.394, y=0.491). According to the chromaticity of the light emitting element and the chromaticity of the first phosphor and the second phosphor used in the light emitting device for a vehicle according to example 1, it can be predicted that the hue cannot be obtained by only the first phosphor and the second phosphor (x=0.394, y=0.419), and it is considered that the third phosphor is required. The light emission spectrum of the color tone obtained by transmitting the color filter 1 from the first, second, and third phosphors (x=0.434, y=0.399) and the transmittance of the color filter 1 were used to confirm the color tone obtained by actually transmitting the color filter 1 (x=0.434, y=0.399) by the spectral simulation software, and the light flux maintenance ratio described later was calculated from the light fluxes before and after transmitting the color filter.

Example 7, comparative example 2

The intensities at the respective wavelengths of the emission spectra of the second phosphor and the third phosphor shown in table 1, which are the hues of (x=0.434, y=0.399) by excitation of the emission of the light-emitting element used in the light-emitting device for a vehicle according to example 1, were divided by the transmittance of each wavelength of the color filter 2 or 3, and the emission spectra of the hues of (x=0.434, y=0.399) after passing through the color filter 2 or 3 were calculated. The obtained spectrum was subjected to hue prediction by the spectrum simulation software, and in example 7, (x=0.365, y=0.440), and in comparative example 2, (x=0.292, y=0.501). According to the chromaticity of the light emitting element and the chromaticity of the first phosphor and the second phosphor used in the light emitting device for a vehicle according to example 1, it can be predicted that the chromaticity of (x=0.434, y=0.399) can be obtained without using the third phosphor if the first phosphor and the second phosphor are used. The light emission spectrum of the color tone obtained by transmitting through the color filter 2 or 3 from the first phosphor and the second phosphor and the transmittance of each color filter 2 or 3 are used to confirm the color tone obtained by actually transmitting through the color filter 2 or 3 (x=0.434, y=0.399), and the light flux maintenance ratio described later is calculated from the light fluxes before and after transmitting through the color filter.

Luminescence spectrum, chromaticity coordinates (xL, yL) (xW, yW), Δx, Δy

The light emission spectra of the light emitting devices for vehicles according to examples 1 to 5 and comparative example 1 were measured at room temperature (25 ℃ ±5℃) using a combination of a spectroscopic photometry device (PMA-11, manufactured by koku pine photonics corporation) and an integrating sphere. Chromaticity coordinates (xL, yL) of the chromaticity diagram are obtained from the emission spectra of the respective vehicle light-emitting devices. The chromaticity coordinates (xL, yL) of the light emission of each vehicle light emitting device according to examples 6 and 7 and comparative example 2 were derived by using spectral simulation software as described above. The emission spectra of the respective vehicle lighting apparatuses of examples 1 to 7 and comparative examples 1 to 2 were obtained by deriving the emission spectra after passing through the color filters from the emission spectra of the respective vehicle lighting apparatuses and the transmittance at each wavelength of the color filters using spectrum simulation software. Chromaticity coordinates (xw, yW) of white light of the vehicle lighting device after passing through the color filter are derived from the obtained emission spectrum of each vehicle lighting device after passing through the color filter. The chromaticity coordinates (xL, yL) of each of the vehicle light emitting devices before passing through the color filter, the chromaticity coordinates (xW, yW) of each of the vehicle front side devices after passing through the color filter, the difference Δx obtained by subtracting the xL value from the xW value, and the difference Δy obtained by subtracting the yL value from the yW value are shown in table 3.

Beam maintenance rate

With respect to the light emitting devices for vehicles of examples 1 to 5 and comparative example 1, the light beams emitted from the respective light emitting devices for vehicles before passing through the color filters were measured by using a full-beam measuring device using an integrating sphere. The light beams emitted from the respective vehicle light-emitting devices before passing through the color filters were obtained from the light emission spectra of the vehicle light-emitting devices of examples 6 and 7 and comparative example 2 using the spectrum simulation software. Then, by using spectral simulation software, the light flux transmitted through each of the color filters of the vehicle lighting devices of examples 1 to 7 and comparative examples 1 to 2 was derived from the light emission spectra of the vehicle lighting devices and the transmittance of each of the color filters. The ratio of the light flux of the white light transmitted through the color filter to the light flux of the light emission before the light flux transmitted through the color filter was calculated as the light flux maintenance ratio (%). The results are shown in Table 3.

TABLE 3

From the results shown in table 3 and fig. 10 to 12, the vehicle light-emitting devices according to embodiments 1 to 5 emit light having chromaticity coordinates (xL, yL) included in the range of the area AL before passing through the color filter 1 or 2, and the vehicle lighting devices according to embodiments 1 to 5 after passing through the color filter 1 or 2 emit white light having chromaticity coordinates (xW, yW) included in the range of the area AW by simulation. From the results shown in table 3 and fig. 13, the vehicle light-emitting devices according to examples 6 and 7 emit light having chromaticity coordinates (xL, yL) included in the range of the area AL by simulation before passing through the color filter 1 or 2, and white light having chromaticity coordinates (xW, yW) included in the range of the area AW is emitted from the sample of the vehicle light-emitting device according to examples 6 and 7 after passing through the color filter 1 or 2 by simulation. In examples 1 to 7, the light flux maintenance ratio of the white light transmitted through the color filter was 45% or more, and the decrease in light flux was successfully suppressed.

Based on the results shown in table 3 and fig. 10, the vehicle light-emitting device according to comparative example 1 emits light having chromaticity coordinates (xL, yL) in a range not included in the area AL before passing through the color filter 3, and the vehicle lighting device according to comparative example 1 emits light having chromaticity coordinates (xW, yW) included in the area AW by simulation after passing through the color filter 3. From the results shown in table 3 and fig. 13, the vehicle light-emitting device according to comparative example 2 emits light having chromaticity coordinates (xL, yL) in a range not included in the area AL by simulation before passing through the color filter 3, and emits light having chromaticity coordinates (xW, yW) included in the area AW by simulation from the sample of the vehicle lighting device according to comparative example 2 through the color filter 3. In comparative examples 1 and 2, the light flux maintenance ratio of the white light transmitted through the color filter was less than 25%, and the light flux was decreased after the light transmitted through the color filter.

A linear derivative of differences Δx and Δy obtained by subtracting chromaticity coordinates (xL, yL) of light emission before passing through the color filter from chromaticity coordinates (xW, yW) of white light after passing through the color filter of the vehicle light-emitting device and the vehicle light-emitting device according to examples 1 to 7 and a linear derivative of minimum transmittance T in a range of 500nm to 550nm inclusive of the color filter 1 or 2 are considered, and a range of a slope and a cutoff are defined.

The minimum transmittance T of the color filter 1 in the range of 500nm or more and 550nm is set to 50%. The minimum transmittance T of the color filter 2 in the range of 500nm or more and 550nm is set to 30%.

The minimum xW value of the area AW of the chromaticity diagram is 0.310, and the maximum xW value of the area AW is 0.500. In a graph in which the xW value after passing through the color filter in this range is taken as the horizontal axis and the difference Δx obtained by subtracting the xL of the light emission before passing through the color filter from the xW value of the white light after passing through the color filter is taken as the vertical axis, the xW values and Δx of the samples of the vehicle lighting devices according to examples 1, 2 and 6 in which the color filter 1 (minimum transmittance T: 50%) is used are plotted, and the following formula (I-1 x) showing the primary straight line in the case where the color filter 1 is used is derived. In a graph having the xW value of white light transmitted through the color filter as the horizontal axis and Δx as the vertical axis, each of the xW values and Δx of the samples of the vehicle lighting devices according to examples 4, 5 and 7 in which the color filter 2 (minimum transmittance T: 30%) was used was plotted, and the following formula (I-2 x) showing the primary straight line in the case where the color filter 2 was used was derived. Fig. 14 is a graph showing, in a graph having the xW value of white light transmitted through the color filter as the horizontal axis and Δx as the vertical axis, two primary straight lines for each color filter obtained from the light emission of the vehicle light emitting device and the white light of the vehicle lighting device according to examples 1 to 7 when the color filter 1 or 2 is used,

Δx＝0.075xW+0.008(I－1x)；

Δx＝0.143xW+0.007(I－2x)。

From the above formula (I-1 x) showing a straight line at a first time when the color filter 1 (minimum transmittance T: 50%) was transmitted, it was confirmed that: the Δx at the minimum value of 0.310 for the x-coordinate of the area AW is 0.030, and the Δx at the maximum value of 0.500 for the x-coordinate of the area AW is 0.050.

Further, it can be confirmed from the above formula (I-2 x) showing a straight line at a first time when the color filter 2 (minimum transmittance T: 30%) is transmitted: the Δx at the minimum value of 0.310 for the x-coordinate of the area AW is 0.050, and the Δx at the maximum value of 0.500 for the x-coordinate of the area AW is 0.080.

Considering the minimum transmittance T in the range of 500nm to 550nm of the color filter, four formulas (I-3 x) to (I-6 x) representing the following four primary straight lines are derived in order to obtain chromaticity coordinates of light emission of the vehicle light emitting device before passing through the color filter, in which white light of a high light flux is obtained after passing through the color filter. In a graph Gx in which a minimum transmittance T (%) of a color filter in a range of 500nm to 550nm is taken as the horizontal axis and a difference Deltax obtained by subtracting an xL value of light emission before passing through the color filter from an xW value of white light after passing through the color filter is taken as the vertical axis, a value of Deltax at a minimum value of 0.310 of an x coordinate of a region AW and a value of Deltax at a maximum value of 0.500 of an x coordinate of the region AW obtained from the formula (I-1 x) and the formula (I-2 x) are plotted. From the four points depicted, formulas (I-3 x), (I-4 x), (I-5 x) and (I-6 x) representing four primary straight lines in which the minimum transmittance T in the range of 500nm to 550nm inclusive of the color filter is taken into consideration are derived. FIG. 15 is a graph in which four points derivable from formulas (I-1 x) and (I-2 x) are plotted in a graph Gx having a minimum transmittance T (%) in a range of 500nm to 550nm inclusive and a vertical axis Deltax as the horizontal axis, and four primary straight lines derivable from the four points are represented,

Δx＝－0.001T+0.082(I－3x)；

Δx＝0.050(I－4x)；

Δx＝－0.003T+0.161(I－5x)；

Δx＝－0.002T+0.128(I－6x)。

In the formulas (I-3 x) to (I-6 x), the slope is set to S ¹ Let the intercept be I ¹ In the case of (a), the following expression (Ix) can be derived. In the formulas (I-3 x) to (I-6 x), the slope S ¹ The minimum value of (2) is-0.003, slope S ¹ Is 0. In the formulae (I-3 x) to (I-6 x), the intercept I ¹ The minimum value of (2) is 0.050, the intercept I ¹ Is set to a maximum value of 0.161,

Δx＝S ¹ ×T+I ¹ (Ix)。

s in formula (Ix) ¹ Represents the slope, I ¹ T represents the minimum transmittance of the color filter in the range of 500nm to 550nm, S ¹ 、I ¹ T respectively satisfies-0.003.ltoreq.S ¹ ≤0、0.050≤I ¹ T is more than or equal to 0.161 and less than or equal to 20 and less than or equal to 70.T may be in the range of 25 to 65 (25.ltoreq.T.ltoreq.65), may be in the range of 30 to 60 (30.ltoreq.T.ltoreq.60), may be in the range of 30 to 55 (30.ltoreq.T.ltoreq.55), and may be in the range of 30 to 50 (30.ltoreq.T.ltoreq.50). In the formula (Ix), Δx may be in a range of 0.025 or more and 0.085 or less (0.025. Ltoreq.Δx. Ltoreq.0.085).

The minimum yW value of the area AW of the chromaticity diagram is 0.300, and the maximum yW value of the area AW is 0.440. In this range, in a graph in which the yW value after passing through the color filter is plotted on the horizontal axis and the difference Δy obtained by subtracting the yL of the light emission before passing through the color filter from the yW value of the white light after passing through the color filter is plotted on the vertical axis, each yW value of the samples of the vehicle lighting devices according to examples 1, 2 and 6 in which the color filter 1 (minimum transmittance T: 50%) is used is plotted, and the following formula (I-1 y) indicating a primary straight line in the case where the color filter 1 is used is derived. In the graph having the yW value of white light transmitted through the color filter as the horizontal axis and Δy as the vertical axis, the sample yW of the vehicle lighting device according to examples 4, 5, and 7 in which the color filter 2 (minimum transmittance T: 30%) was used was plotted, and the following equation (I-2 yx) showing the primary straight line in the case where the color filter 2 was used was derived. Fig. 16 is a graph showing two primary straight lines for each color filter obtained from the light emission of the vehicle light-emitting device and the vehicle lighting device according to examples 1 to 7 when the color filter 1 or 2 is used, in a graph showing the yW value of white light transmitted through the color filter as the horizontal axis and Δy as the vertical axis,

Δy＝－0.014yW－0.014(I－1y)；

Δy＝－0.041yW+－0.025(I－2y)。

From the above formula (I-1 y) showing a straight line at a time when the color filter 1 (transmittance T: 50%) was transmitted, it was confirmed that: Δy at the minimum value of 0.300 for the y-coordinate of region AW is-0.030, and Δy at the maximum value of 0.440 for the y-coordinate of region AW is-0.010.

Further, it can be confirmed from the above formula (I-2 y) showing a straight line once when the color filter 2 (transmittance T: 30%) is transmitted: Δy at the minimum value of 0.300 for the y-coordinate of region AW is-0.050, and Δy at the maximum value of 0.440 for the y-coordinate of region AW is-0.030.

Considering the minimum transmittance T in the range of 500nm to 550nm of the color filter, four formulas (I-3 y) to (I-6 y) representing the following four primary straight lines are derived in order to obtain chromaticity coordinates of light emission of the vehicle light emitting device before passing through the color filter, in which white light of a high light flux is obtained after passing through the color filter. In a graph Gy in which the minimum transmittance T (%) of the color filter in a range of 500nm to 550nm is taken as the horizontal axis and the difference Deltay obtained by subtracting the yL value of the light emission before passing through the color filter from the yW value of the white light after passing through the color filter is taken as the vertical axis, the value of Deltay at the minimum value of 0.300 of the y coordinate of the area AW and the value of Deltay at the maximum value of 0.440 of the y coordinate of the area AW obtained from the expression (I-1 y) and the expression (I-2 y) are plotted. From the four points depicted, formulas (I-3 y), (I-4 y), (I-5 y), and (I-6 y) representing four primary straight lines in which the minimum transmittance T in the range of 500nm to 550nm inclusive of the color filter is considered are derived. FIG. 17 is a graph showing four points derivable from formulas (I-1 y) and (I-2 y) and four primary straight lines derivable from the four points in a graph Gy with a minimum transmittance T (%) in a range of 500nm to 550nm inclusive and a vertical axis Deltay as the horizontal axis of the color filter,

Δy＝0.001T－0.082(I－3y)；

Δy＝0.002T－0.114(I－4y)；

Δy＝－0.030(I－5y)；

Δy＝0.001T－0.062(I－6y)。

In the formulas (I-3 y) to (I-6 y), the slope is set to S ² Let the intercept be I ² In the case of (a), the following expression (Iy) can be derived. In the formulas (I-3 y) to (I-6 y), the slope S ² Is 0, slope S ² Is 0.002. In the formulae (I-3 y) to (I-6 y), the intercept I ² The minimum value of (2) is-0.114, the intercept I ² Is-0.030.

Δy＝S ² ×T+I ² (Iy)

S in formula (Iy) ² Represents the slope, I ² T represents the minimum transmittance of the color filter in the range of 500nm to 550nm, S ² 、I ² T is more than or equal to 0 and less than or equal to 0.002, S2 is more than or equal to 0.114 and less than or equal to minus 0.030, T is more than or equal to 20 and less than or equal to 70.T may be in the range of 25 to 65 (25.ltoreq.T.ltoreq.65), may be in the range of 30 to 60 (30.ltoreq.T.ltoreq.60), may be in the range of 30 to 55 (30.ltoreq.T.ltoreq.55), and may be in the range of 30 to 55May be in the range of 30 to 50 (30.ltoreq.T.ltoreq.50). In the formula (Iy), Δy may be within a range of-0.055 or more and-0.005 or less (-0.055. Ltoreq.Δy. Ltoreq.0.005).

From Δx, Δy derived from chromaticity coordinates (xL, yL) of light emission of the vehicle light-emitting device according to examples 1 to 7 and chromaticity coordinates (xW, yW) of white light of the sample of the vehicle light-emitting device and minimum transmittance T (%) in a range of 500nm to 550nm of the color filters 1 and 2, it was confirmed whether or not the light emission of examples 1 to 7 satisfies the formulas (Ix) and (Iy).

Fig. 18 is a graph Gx showing a substantially straight line derived from points at which light emission of the vehicle light-emitting device and the sample of the vehicle light-emitting device according to examples 1 to 7 is plotted, in a graph Gx in which the minimum transmittance T (%) of the color filter in a range of 500nm to 550nm inclusive is shown as the horizontal axis and the difference Δx obtained by subtracting the xL value of light emission before passing through the color filter from the xW value of white light after passing through the color filter is shown as the vertical axis. In the graph Gx, an approximate one-time straight line derived from the light emission of the vehicle light-emitting device and the white light of the sample of the vehicle lighting device according to embodiments 1 to 7 is represented by the following formula (I-8 x),

Δx＝－0.001T+0.097(I－8x)。

in the graph Gx, the slope S of the equation (I-8 x) of an approximate primary straight line derived from the light emission of the vehicle light-emitting device and the white light of the sample of the vehicle lighting device according to embodiments 1 to 7 is shown ¹ Is-0.001, intercept I ¹ 0.097. The formula (I-8 x) satisfies the slope S in the formula (Ix) ¹ Is not less than-0.003 and not more than 0 (-0.003.ltoreq.S) ¹ Less than or equal to 0) meets the cutting moment I ¹ Is not less than 0.050 but not more than 0.161 (0.050. Ltoreq.I) ¹ Less than or equal to 0.161), and satisfies the formula (Ix).

Fig. 19 is a graph showing a substantially straight line derived from points at which light emission of the vehicle light-emitting device and the sample of the vehicle lighting device according to examples 1 to 7 is plotted, in a graph Gy in which a minimum transmittance T (%) of the color filter in a range of 500nm to 550nm inclusive is plotted on the horizontal axis and a difference Δy obtained by subtracting the yL value of light emission before passing through the color filter from the yW value of white light after passing through the color filter is plotted on the vertical axis. In the graph Gy, an approximate one-time straight line derived from the light emission of the vehicle light-emitting device and the white light of the sample of the vehicle lighting device according to embodiments 1 to 7 is represented by the following formula (I-8 y),

Δy＝0.001T－0.072(I－8y)。

In the graph Gy, the slope S of the approximate primary straight line of the formula (I-8 y) derived from the light emission of the vehicle light-emitting device and the white light of the sample of the vehicle lighting device according to embodiments 1 to 7 is shown ² 0.001, intercept I ² Is-0.072. The formula (I-8 y) satisfies the slope S in the formula (Iy) ² Is in a range of 0 to 0.002 (0.ltoreq.S) ² Less than or equal to 0.002), meets the intercept I ² Is within a range of-0.114 to-0.030 (-0.114.ltoreq.I) ² Less than or equal to-0.030), and the formula (Ix) is satisfied.

Since the examples of the vehicle light-emitting device and the vehicle lighting device according to embodiments 1 to 7 satisfy the formulas (Ix) and (Iy), white light in the white region Ws defined by JISD5500 or ECE is emitted while suppressing the decrease in light flux even after passing through the color filter, and the predetermined white light can be emitted by one color filter, and the degree of freedom in designing the vehicle lighting device used as a rear combination lamp for a vehicle body can be improved.

Industrial applicability

The vehicular lighting device according to the embodiment of the present disclosure can be used as a vehicular lighting device. The vehicle lighting device can be used for a rear combination lamp of a vehicle used in a vehicle construction machine such as a road transportation vehicle such as a motorcycle or a motorcycle, a railway vehicle, a tractor such as a soil preparation, transportation, and loading machine, or an excavator such as an excavating machine.

Description of the reference numerals

2: color filter, 3: a housing, 6: shaped body or package, 10: lighting device for vehicle, 11: a vehicular light-emitting device or a first vehicular light-emitting device, 12: second vehicle light-emitting device, 13: third vehicle light-emitting device, 20: first lead, 30: second lead, 41: light emitting element or first light emitting element, 42: second light emitting element, 43: third light emitting element, 51: fluorescent member or first fluorescent member, 52: second fluorescent member, 53: third fluorescent member, 60: wire, 70: phosphor, 71: first phosphor, 72: second phosphor, 73: and a third phosphor.

Claims

1. A light-emitting device for a vehicle is provided with:

2. The vehicular light-emitting device according to claim 1,

(Ca,Sr,Ba) ₈ MgSi ₄ O ₁₆ (F,Cl,Br) ₂ :Eu(1a)；

(Lu,Y,Gd,Tb) ₃ (Al,Ga) ₅ O ₁₂ :Ce(1b)；

Si _6－z Al _z O _z N _8－z :Eu(0＜z≤4.2)(1c)。

3. the vehicular light-emitting device according to claim 1 or 2,

(Y,Gd,Tb) ₃ Al ₅ O ₁₂ :Ce(2a)。

4. The vehicular light-emitting device according to claim 1 or 2,

5. The vehicular light-emitting device according to claim 4,

(Sr,Ca)AlSiN ₃ :Eu(3a)；

(Ba,Sr) ₂ Si ₅ N ₈ :Eu(3b)。

6. a lighting device for a vehicle is provided,

the device is provided with: the vehicular light-emitting device according to claim 1; a color filter provided at a position where light emitted from the vehicle light-emitting device is incident, wherein a maximum transmittance of light in a range of 410nm to 480nm is more than 50% and 90% or less, a minimum transmittance of light in a range of 500nm to 550nm is more than 20% and 70% or less, and a transmittance of light in a range of 600nm to 730nm is 80% or more; white light is emitted from the vehicle light-emitting device and transmitted through the color filter.

7. The vehicular illumination device according to claim 6,

8. The vehicular illumination device according to claim 6 or 7,

9. The vehicular illumination device according to claim 6 or 7,

Δx＝S ¹ ×T+I ¹ (Ix)，

in the graph Gx, S in the formula (Ix) ¹ Represents the slope, I ¹ Representing the intercept, S ¹ 、I ¹ T respectively satisfies-0.003.ltoreq.S ¹ ≤0、0.050≤I ¹ ≤0.161、20＜T≤70；

Δy＝S ² ×T×I ² (Iy)，

In the graph Gy, S in the formula (Iy) ² Represents the slope, I ² Representing the intercept, S ² 、I ² T respectively satisfies 0.ltoreq.S ² ≤0.002、－0.114≤I ² ≤－0.030、20＜T≤70。

10. The vehicular illumination device according to claim 9,

11. A lighting device for a vehicle is provided,

a vehicle light-emitting device according to claim 1, and a color filter that transmits light emitted from the vehicle light-emitting device to emit white light,

Δx＝S ¹ ×T+I ¹ (Ix)，

Δy＝S ² ×T×I ² (Iy)，

12. The vehicular illumination device according to claim 11,