Light-emitting device for vehicle and headlight for vehicle

Abstract

This light-emitting device for a vehicle is capable of emitting light that falls within the range of the ECE standard, has a correlated color temperature of higher than 5000 K but no higher than 7000 K, and has a color deviation duv of -0.02 to -0.01.

Description

Light emitting device for vehicle, vehicle headlamp

[0001] The present disclosure relates to a light emitting device for a vehicle and a vehicle headlamp.

[0002] For example, as a lighting device that can more suitably improve the appearance of skin, a lighting device has been disclosed that is characterized by having a light-emitting unit that emits light in a spectral range in which the skin color preference index PS is 80 to 100, the color deviation duv is -0.01 to 0, and the color temperature is 3000 to 5000 K (see, for example, Patent Document 1).

[0003] JP 2012-155906 A

[0004] The present disclosure aims to provide a vehicle light emitting device capable of improving the visibility of an object, and also to provide a vehicle headlamp equipped with the vehicle light emitting device.

[0005] A light emitting device for a vehicle according to an embodiment of the present disclosure is capable of emitting light that is within the range of the ECE standard, has a correlated color temperature higher than 5000 K and not higher than 7000 K, and has a color deviation duv of -0.02 or more and -0.01 or less. Furthermore, a light emitting device for a vehicle according to an embodiment of the present disclosure is capable of emitting light that is within the range of the ECE standard, has a correlated color temperature higher than 5000 K and not higher than 7000 K, and has a color deviation duv of -0.02 or more and -0.006 or less.

[0006] A vehicle headlamp according to an embodiment of the present disclosure includes a vehicle light emitting device according to an embodiment of the present disclosure and an optical member that irradiates at least a portion of light from the vehicle light emitting device toward a direction ahead of the vehicle. The vehicle headlamp according to an embodiment of the present disclosure is capable of emitting light that satisfies the ECE standard, has a correlated color temperature of greater than 5000 K and not more than 7000 K, and has a color deviation duv of -0.02 or more and -0.006 or less.

[0007] According to an embodiment of the present disclosure, it is possible to provide a vehicle light emitting device capable of improving the visibility of an object, and also to provide a vehicle headlamp including the vehicle light emitting device.

[0008] 8 is a perspective view schematically showing a vehicle light emitting device according to the present embodiment. FIG. 9 is a bottom view schematically showing a vehicle light emitting device according to the present embodiment. FIG. 10 is a top view of the vehicle light emitting device shown in FIG. 1 with the sealing member removed. FIG. 11 is a longitudinal cross-sectional view taken along line IV-IV in FIG. 1. FIG. 12 is a diagram summarizing examples and comparative examples. FIG. 13 is a chromaticity diagram (1) of the vehicle light emitting devices according to the examples and comparative examples. FIG. 14 is a chromaticity diagram (2) of the vehicle light emitting devices according to the examples and comparative examples. FIG. 15 is a schematic diagram explaining the evaluation environment. FIG. 16 is a schematic diagram explaining the evaluation environment. FIG. 17 is a diagram explaining the evaluation scores. FIG. 18 is a perspective view schematically showing a vehicle headlamp equipped with the vehicle light emitting device according to the present embodiment. FIG. 19 is a longitudinal cross-sectional view taken along line IX-IX in FIG.

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., "upper," "lower," and other terms including these terms) will be used as necessary. However, the use of these terms is intended to facilitate understanding of the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. Furthermore, parts that appear with the same reference numerals in multiple drawings indicate the same or equivalent parts or components.

[0010] Furthermore, the embodiments described below are intended to exemplify vehicle lighting devices and the like embodying the technical concepts of the present invention, and are not intended to limit the scope of the present invention. Furthermore, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are intended for illustrative purposes only and are not intended to limit the scope of the present invention. The relationship between color names and chromaticity coordinates, the relationship between light wavelength ranges and monochromatic light color names, etc., conforms to JIS Z8110. The content described in the first embodiment is also applicable to other embodiments and modified examples. The size and positional relationships of components shown in the drawings may be exaggerated for clarity. To avoid overly complex drawings, schematic diagrams may be used in which some elements are omitted, or end views may be used as cross-sectional views showing only the cut surface.

[0011] [Outline of Vehicle Light Emitting Device] A vehicle light emitting device 1 will be described as an example of a vehicle light emitting device according to the present disclosure. FIG. 1 is a perspective view that schematically shows the vehicle light emitting device according to this embodiment. FIG. 2 is a bottom view that schematically shows the vehicle light emitting device according to this embodiment. FIG. 3 is a top view of the vehicle light emitting device shown in FIG. 1 with the sealing member removed. FIG. 4 is a vertical cross-sectional view taken along line IV-IV in FIG. 1. FIG. 4 shows a cross section taken along line IV-IV in FIG. 1 and perpendicular to the top surface 10a of the package 10.

[0012] As illustrated in FIGS. 1 to 4, the light emitting device 1 for a vehicle includes a package 10, a light emitting element 20, and a sealing member 30.

[0013] The package 10 functions as a housing for accommodating the light-emitting element 20. In the illustrated example, the package 10 includes an insulating base 13 and lead terminals 14A and 14B. The package 10 also includes an upper surface 10a, a lower surface 10b, and four side surfaces 10c, 10d, 10e, and 10f. The outer edge of the upper surface 10a is, for example, substantially rectangular.

[0014] The package 10 has a recess 11 that opens to the top surface 10a. The base 13 forms part of the bottom surface 11b of the recess 11 and an inner side surface 11c of the recess 11. The inner side surface 11c is an inclined surface that is inclined relative to the bottom surface 11b. The top surface 10a of the package 10 may be provided with irregularities on the surface, a groove surrounding the opening, or the like. Parts of the lead terminals 14A and 14B are exposed on the bottom surface 11b of the recess 11.

[0015] The light-emitting element 20 is disposed on a lead terminal 14A exposed on the bottom surface 11b of the recess 11. A pair of positive and negative electrodes of the light-emitting element 20 are electrically connected to the lead terminals 14A and 14B exposed on the bottom surface 11b of the recess 11 by conductive wires 21A and 21B, respectively. When a current is supplied to the light-emitting element 20 from an external power source via the lead terminals 14A and 14B and the conductive wires 21A and 21B, the light-emitting element 20 emits light. From the viewpoint of improving the visibility of an object, the light-emitting element 20 preferably has an emission peak wavelength in the range of 400 nm to 460 nm.

[0016] In this embodiment, the vehicle light emitting device 1 includes a protective element 40. The protective element 40 is disposed on a lead terminal 14B exposed on the bottom surface 11b of the recess 11, and an electrode on the bottom surface is electrically connected to the lead terminal 14B. An electrode on the top surface of the protective element 40 is electrically connected to the lead terminal 14A by a conductive wire 22A. The light emitting element 20 and the protective element 40 are connected in parallel by such wiring.

[0017] The sealing member 30 is disposed in the recess 11. The sealing member 30 covers the light emitting element 20, the protective element 40, and the conductive wires 21A, 21B, and 22A within the recess 11, protecting them from moisture, external forces, and dust. The sealing member 30 is not disposed on the upper surface 10a of the package 10. The sealing member 30 includes a base material 31 and a wavelength conversion member 32. An example of the wavelength conversion member 32 is a phosphor that absorbs at least a portion of the light from the light emitting element 20 and emits light.

[0018] By including a phosphor in the sealing member 30, part or all of the light emitted from the light-emitting element 20 can be converted into light of another wavelength band and emitted from the upper surface of the sealing member 30. For example, if the light-emitting element 20 emits blue light and the phosphor converts the blue light into yellow light, the light emitted from the light-emitting device 1 for a vehicle can be white light that is a mixture of the blue light emitted by the light-emitting element 20 and the yellow light emitted by the wavelength conversion member 32.

[0019] The vehicle light emitting device 1 may contain one type of phosphor alone or two or more types of phosphors. From the viewpoint of improving the visibility of an object, the phosphor preferably contains a first phosphor having an emission peak wavelength in the range of 500 nm or more and less than 560 nm. The first phosphor contains, for example, a phosphor having a composition represented by the following formula [1A]:

[0020] (Y ａ , Lu １－ａ ) ｘ (Al ｂ , Ga １－ｂ ) ｙ O １２ : Ce ｚ[1A] (In formula [1A], a, b, x, y, and z satisfy 0≦a≦1, 0≦b≦1, 2.8≦x≦3.2, 4.8≦y≦5.2, and 0.009≦z≦0.6. In formula [1A], a may satisfy 0<a≦1 or 0<a<1. In formula [1A], b may satisfy 0<b≦1 or 0<b<1.)

[0021] The phosphor preferably further includes a second phosphor having an emission peak wavelength in the range of 560 nm or more and less than 620 nm. The second phosphor includes, for example, at least one phosphor selected from the group consisting of phosphors having a composition represented by the following formula [2A] and phosphors having a composition represented by the following formula [2B]:

[0022] (Y ａ , Gd １－ａ ) ｘ Al ｙ O １２ : Ce ｚ [2A] (In formula [2A], x, y, and z satisfy 0≦a≦1, 2.8≦x≦3.2, 4.8≦y≦5.2, and 0.009≦z≦0.6. In formula [2A], a may be 0<a≦1 or 0<a<1.), Ca ｓ Sr ｔ EU ｕ Si ｖ Al ｗ N ｘ [2B] (In formula [2B], s, t, u, v, w, and x satisfy 0<s<1, 0≦t<1, 0.002≦u≦0.08, 0.8≦s+t+u≦1.1, 0.8≦v≦1.2, 0.8≦w≦1.2, 1.8≦v+w≦2.2, 2.5≦x≦3.2.)

[0023] The vehicle light emitting device 1 is capable of emitting light from the sealing member 30 that is within the range of the ECE standard, has a correlated color temperature higher than 5000 K and equal to or lower than 7000 K, and has a color deviation duv of -0.02 or more and -0.006 or less. The color deviation duv may be equal to or higher than -0.02 and equal to or lower than -0.01. This enables the vehicle light emitting device 1 to improve the visibility of the object. Here, the object is, for example, a center line visible from inside the vehicle. The object may also be an instrument panel visible inside the vehicle.

[0024] In the light emitting device 1 for vehicles, the color deviation duv is preferably -0.017 or more and -0.006 or less. The color deviation duv may be -0.017 or more and -0.01 or less. This makes it possible to further improve the visibility of the object. Furthermore, in the light emitting device 1 for vehicles, the correlated color temperature is preferably 5500K or more and 6500K or less. This makes it possible to further improve the visibility of the object. In the light emitting device 1 for vehicles, the correlated color temperature may be 5600K or more and 6300K or less, or may be 5800K or more and 6100K or less.

[0025] Furthermore, the vehicular light emitting device 1 is capable of emitting light having an average color rendering index Ra greater than 66 and less than 80. This enables the vehicular light emitting device 1 to improve the visibility of an object. The vehicular light emitting device 1 may be capable of emitting light having an average color rendering index Ra of 80 or greater. By emitting light having an average color rendering index Ra of 80 or greater, it becomes possible to further improve the visibility of an object. Note that by emitting light having an average color rendering index Ra of 80 or greater, the visibility of a visual object, particularly of a yellow color, tends to improve. The vehicular light emitting device 1 may be capable of emitting light having a color deviation duv of -0.02 or greater and less than -0.012, and an average color rendering index Ra greater than 66 and less than 70.

[0026] In the emission spectrum of the vehicle light emitting device 1, the integrated value of the emission intensity in the wavelength range of 620 nm to 780 nm is preferably 45% to 60% of the integrated value of the emission intensity in the wavelength range of 380 nm to 470 nm. Here, the integrated value of the emission intensity in the wavelength range of 620 nm to 780 nm is the red component in the emission spectrum. Furthermore, the integrated value of the emission intensity in the wavelength range of 380 nm to 470 nm is the blue component in the emission spectrum. Since the long-wave red component is a component outside the luminous sensitivity range, an increase in the red component reduces the luminous flux. In the emission spectrum of the vehicle light emitting device 1, if the red component / blue component ratio is 45% to 60%, the luminous flux of the vehicle light emitting device 1 can be increased. The red component / blue component ratio may be 52% to 60%.

[0027] The vehicle light emitting device according to the present disclosure will be described in more detail below using examples, but the vehicle light emitting device according to the present disclosure is not limited to these examples.

[0028] First, four types of phosphors were prepared: YAG1, YAG2, LAG1, and SCASN1. The peak wavelength, composition formula, and average particle size of each phosphor are as shown in Table 1.

[0029]

[0030] Next, eight types of light emitting devices for vehicles having the structures shown in Figures 1 to 4 were fabricated using the phosphors shown in Table 1. A specific description will be given below.

[0031] [Fabrication of Vehicle Light-Emitting Device] [Comparative Example 1] First, a package 10 including a base 13 and lead terminals 14A and 14B and having a recess 11 was prepared. A light-emitting element 20 having an emission peak wavelength in the range of 400 nm to 460 nm was also prepared. The light-emitting element 20 was then placed on the bottom surface 11b of the recess 11 of the package 10, and the positive and negative electrodes of the light-emitting element 20 were connected to the lead terminals 14A and 14B with conductive wires 21A and 21B, respectively. Next, YAG1 (phosphor 1) shown in Table 1 was prepared as a wavelength conversion member 32, and a resin was prepared as a base material 31. The resin containing YAG1 (phosphor 1) was placed in the recess 11 and then heated to harden the resin, thereby fabricating a vehicle light-emitting device according to Comparative Example 1. In the vehicle light-emitting device according to Comparative Example 1, the phosphor concentration per 100 parts by mass of resin was 22 parts by mass.

[0032] Example 1 A light emitting device for a vehicle according to Example 1 was produced in the same manner as Comparative Example 1, except that YAG1 (phosphor 1) and YAG2 (phosphor 2) shown in Table 1 were added as wavelength conversion member 32 to resin, which is base material 31. In the light emitting device for a vehicle according to Example 1, the phosphor concentration was 19 parts by mass per 100 parts by mass of resin, and the compounding ratio of phosphor 1 to phosphor 2 was 60:40.

[0033] Example 2 A light emitting device for a vehicle according to Example 2 was produced in the same manner as Comparative Example 1, except that LAG1 (phosphor 1) and SCASN1 (phosphor 2) shown in Table 1 were added as wavelength conversion member 32 to the resin that was the base material 31. In the light emitting device for a vehicle according to Example 2, the phosphor concentration was 18.5 parts by mass with respect to 100 parts by mass of resin, and the compounding ratio of phosphor 1 to phosphor 2 was 30:70.

[0034] [Comparative Example 2] A light emitting device for a vehicle according to Comparative Example 2 was produced in the same manner as Comparative Example 1, except that LAG1 (phosphor 1) and SCASN1 (phosphor 2) shown in Table 1 were added as wavelength conversion member 32 to the resin that was base material 31. In the light emitting device for a vehicle according to Comparative Example 2, the phosphor concentration was 76 parts by mass per 100 parts by mass of resin, and the compounding ratio of phosphor 1 to phosphor 2 was 89.7:10.3.

[0035] Example 3 A light emitting device for a vehicle according to Example 3 was produced in the same manner as Comparative Example 1, except that LAG1 (phosphor 1) and SCASN1 (phosphor 2) shown in Table 1 were added as wavelength conversion member 32 to the resin that was the base material 31. In the light emitting device for a vehicle according to Example 3, the phosphor concentration was 69 parts by mass with respect to 100 parts by mass of resin, and the compounding ratio of phosphor 1 to phosphor 2 was 87.7:12.4.

[0036] Example 4 A light emitting device for a vehicle according to Example 4 was produced in the same manner as Comparative Example 1, except that LAG1 (phosphor 1) and SCASN1 (phosphor 2) shown in Table 1 were added as wavelength conversion member 32 to the resin that was the base material 31. In the light emitting device for a vehicle according to Example 4, the phosphor concentration was 65 parts by mass with respect to 100 parts by mass of resin, and the compounding ratio of phosphor 1 to phosphor 2 was 85:15.

[0037] Comparative Example 3 A light emitting device for a vehicle according to Comparative Example 3 was produced in the same manner as Comparative Example 1, except that LAG1 (phosphor 1) and SCASN1 (phosphor 2) shown in Table 1 were added as wavelength conversion member 32 to the resin that was base material 31. In the light emitting device for a vehicle according to Comparative Example 3, the phosphor concentration was 87 parts by mass per 100 parts by mass of resin, and the compounding ratio of phosphor 1 to phosphor 2 was 86.8:13.2.

[0038] Example 5 A light emitting device for a vehicle according to Example 5 was produced in the same manner as Comparative Example 1, except that YAG1 (phosphor 1) and YAG2 (phosphor 2) shown in Table 1 were added as wavelength conversion member 32 to the resin that was base material 31. In the light emitting device for a vehicle according to Example 5, the phosphor concentration was 23 parts by mass per 100 parts by mass of resin, and the compounding ratio of phosphor 1 to phosphor 2 was 85.3:14.7.

[0039] [Characteristics of Vehicle Light-Emitting Devices] For the eight types of vehicle light-emitting devices produced, the chromaticity coordinates x and y, correlated color temperature Tcp (K), color deviation duv, and general color rendering index Ra were measured using an optical measurement system combining a spectrophotometer (PMA-11, manufactured by Hamamatsu Photonics K.K.) and an integrating sphere, and the results are summarized in FIG. 5. Furthermore, for the eight types of vehicle light-emitting devices produced, the emission spectra were measured using an optical measurement system combining a spectrophotometer (PMA-11, manufactured by Hamamatsu Photonics K.K.) and an integrating sphere. Then, based on the measurement results of the emission spectra, the ratio of the integrated value of the emission intensity in the wavelength range of 620 nm to 780 nm to the integrated value of the emission intensity in the wavelength range of 380 nm to 470 nm, i.e., the ratio of the red component to the blue component (red component / blue component), was calculated, and the results are summarized in FIG. 5.

[0040] Chromaticity diagrams for Comparative Example 1, Example 1, and Example 2 are shown in FIG. 6A, and chromaticity diagrams for Comparative Example 2, Example 3, Example 4, Comparative Example 3, and Example 5 are shown in FIG. 6B. FIGS. 6A and 6B show the ECE standard and the locus of color deviation duv at each correlated color temperature within the range of the x value of the chromaticity coordinates in the CIE 1931 color coordinate system, which is 0.250 to 0.550 and the y value is 0.250 to 0.450. duv. ±0 is the blackbody radiation locus. The ECE (United Nations Economic Commission for Europe) standard is a unified standard for light distribution, chromaticity, etc. adopted by major countries, including Japan. The chromaticity coordinates of points A to F in the ECE standard are as shown in Table 2.

[0041]

[0042] [Evaluation of visibility] The visibility of the eight types of vehicle light emitting devices produced was evaluated. The evaluation was performed using Scheffe's paired comparison method (modified by Nakaya). Scheffe's paired comparison method (modified by Nakaya) involves presenting a pair of samples to an evaluator and asking them to rate which sample is more preferable. The details are as follows.

[0043] [Evaluation Environment] Figures 7A and 7B are schematic diagrams illustrating the evaluation environment, in which, for reference, an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other are shown.

[0044] As shown in FIG. 7A , a box 200 containing a visual target 201 and a box 300 containing a visual target 301 were placed on a horizontal plane 400. An evaluator 500 stood in front of the centers of the visual targets 201 and 301. The X-axis and Y-axis are in a plane parallel to the horizontal plane 400, and the Z-axis is normal to the horizontal plane 400. The X-axis direction is the direction in which the visual targets 201 and 301 are aligned. The Y-axis direction is the direction connecting the centers of the visual targets 201 and 301 and the midpoint between the left and right eyes of the evaluator 500. Here, the distance L connecting the centers of the visual targets 201 and 301 and the midpoint between the left and right eyes of the evaluator 500 was set to 100 cm.

[0045] 7B is a schematic diagram showing how each visual target is viewed by an evaluator. A light source 202 is placed above visual target 201, and a light source 302 is placed above visual target 301. Light source 202 and light source 302 have different characteristics such as correlated color temperature and color deviation.

[0046] The evaluators were four men and eight women, with an age breakdown of three in their 20s, three in their 30s, four in their 40s, and two in their 50s. During the evaluation, the brightness of light source 202 and light source 302 was set to be equal. In addition, the illuminance at the position of the evaluator's face was set to 0.7 lx or more and 0.8 lx or less.

[0047] [Evaluation] Evaluation was performed for the cases where the visual targets 201 and 301 were white straight lines imitating a center line, and where the visual targets 201 and 301 were yellow straight lines imitating a center line. The background of the visual targets 201 and 301 was gray, simulating asphalt. The light source 202 irradiating the left visual target 201 was fixed to the vehicle light-emitting device according to Comparative Example 1. The light source 302 irradiating the right visual target 301 was then sequentially changed to the vehicle light-emitting devices according to the other examples, and evaluation was performed.

[0048] Each evaluator was asked to rate which of the left and right visual targets was easier to see on a 7-point scale, and the results were scored. Specifically, as shown in FIG. 7C , if the left visual target 201 was "very easy to see," 3 points were assigned, if it was "normally easy to see," 2 points were assigned, and if it was "slightly easy to see," 1 point was assigned. If the right visual target 301 was "very easy to see," -3 points were assigned, if it was "normally easy to see," -2 points were assigned, and if it was "slightly easy to see," -1 point was assigned. If it was "neither," 0 points were assigned. A negative score indicates that the visual target 301 was easier to see than the visual target 201, and the larger the absolute value of the score, the easier it was to see. The results of the visibility evaluation are summarized in FIG. 5 as scores based on the vehicular light-emitting device of Comparative Example 1.

[0049] [Consideration of Results] As shown in Figure 5, the vehicle light emitting devices according to Examples 1 to 5 received negative scores for both the white line and the yellow line, resulting in easier visibility than the vehicle light emitting device according to Comparative Example 1. On the other hand, the vehicle light emitting device according to Comparative Example 2 received a positive score for the white line, resulting in harder visibility than the vehicle light emitting device according to Comparative Example 1. From these results, it can be said that in order to make both the white line and the yellow line easier to see, it is preferable that the color deviation duv be -0.017 or more and -0.006 or less. The color deviation duv may also be -0.017 or more and -0.01 or less.

[0050] Furthermore, the vehicular light-emitting device according to Comparative Example 3 received a positive score for the white line, resulting in a white line that was less visible than that of the vehicular light-emitting device according to Comparative Example 1. Considering this result together with the results of the vehicular light-emitting devices according to Examples 1 to 5, it appears that the visibility of white and yellow lines is not sufficient simply for the color deviation duv to be between -0.017 and -0.006, and that there is also a preferred range for the correlated color temperature. Since the vehicular light-emitting device according to Comparative Example 3 has a correlated color temperature of 5000 K or less, it can be said that the visibility of white and yellow lines requires a color deviation duv of between -0.017 and -0.006, and a correlated color temperature higher than 5000 K and 7000 K or less. The reason for the recommendation that the color deviation be 7000 K or less is due to consideration of the ECE standard. A correlated color temperature of 5500 K or more and 6500 K or less is more preferable. The correlated color temperature may be 5600K or more and 6300K or less, or 5800K or more and 6100K or less.

[0051] Furthermore, the absolute value of the number of points on the yellow line is larger in the vehicular light emitting devices according to Examples 3 and 4 than in the vehicular light emitting devices according to Examples 1 and 2. From this, it can be said that the visibility of the yellow line also depends on the general color rendering index Ra, and that it is preferable that the general color rendering index Ra is 80 or more. In other words, in order to make the white and yellow lines easy to see, it can be said that it is particularly preferable that the color deviation duv is -0.017 or more and -0.006 or less, the correlated color temperature is 5500 K or more and 6500 K or less, and the general color rendering index Ra is 80 or more.

[0052] Furthermore, in the emission spectra of the vehicle light emitting devices 1 according to Examples 1 to 5, the red component / blue component ratio was 48% or more and 57% or less. That is, the integrated value of the emission intensity in the wavelength range of 620 nm to 780 nm was 48% or more and 57% or less of the integrated value of the emission intensity in the wavelength range of 380 nm to 470 nm. If the red component / blue component ratio is within this range, the luminous flux of the vehicle light emitting device can be increased. The red component / blue component ratio may be 52% or more and 57% or less.

[0053] The reason why the white and yellow lines are used as visual targets is because they are typical examples of visual targets that can be seen from inside the vehicle. It goes without saying that the vehicle light emitting device according to the present disclosure improves the visibility of visual targets other than the white and yellow lines by satisfying the above-mentioned conditions for the color deviation duv and correlated color temperature.

[0054] [Each Component of the Vehicle Light Emitting Device] Hereinafter, each component of the vehicle light emitting device 1 will be described.

[0055] [Package 10] The base 13 is formed of an insulating material. It is also preferably formed of a material that is less transparent to light from the light-emitting element 20 and external light. Because the base 13 is a key component that maintains the structure of the package 10, it preferably has a predetermined strength. The base 13 is formed of, for example, a thermosetting resin, a thermoplastic resin, a ceramic, or the like. More specifically, the base 13 is formed of a resin material such as epoxy resin, silicone resin, phenolic resin, glass epoxy resin, BT resin, or PPA, or a ceramic material such as aluminum oxide or aluminum nitride. The base 13 may also be formed on the inner surface 11c of the recess 11 from a material that reflects light from the light-emitting element 20. In other words, the inner surface 11c may be formed of a different material that has a higher reflectivity for light from the light-emitting element 20 than the material constituting the outer surface of the base 13. This improves the light extraction efficiency of the vehicle light-emitting device 1.

[0056] The lead terminals 14A and 14B function as terminals for electrically connecting the light emitting element 20 to wiring or the like external to the package 10. The package 10 includes at least one pair of lead terminals 14A and 14B. A portion of each of the lead terminals 14A and 14B is exposed on the outer surface of the package 10, and the other portion is embedded in the base 13. In this embodiment, the lead terminal 14A has an end face exposed on the side surfaces 10c, 10e, and 10f of the package 10. The lead terminal 14B has an end face exposed on the side surfaces 10c, 10e, and 10f of the package 10.

[0057] During the manufacture of the vehicle light emitting device 1, the package 10 is formed from a resin-coated lead frame in which a plurality of packages 10 are integrally formed. Side surfaces 10c, 10d, 10e, and 10f of the package 10 and the end surfaces exposed thereto are formed when the resin-coated lead frame is cut. By using such a lead frame in which a plurality of packages are connected, a plurality of vehicle light emitting devices can be manufactured.

[0058] The lead terminals 14A and 14B have two opposite main surfaces, and as described above, one of the two main surfaces is partially exposed at the bottom surface 11b of the recess 11, and the other is partially exposed at the lower surface 10b of the package 10. The package 10 may include electrodes or wiring formed on the surface of the base 13, instead of the lead terminals 14A and 14B.

[0059] The lead terminals 14A and 14B are preferably made of a material with a relatively high thermal conductivity. Forming the lead terminals from such a material allows heat generated by the light-emitting element 20 to be efficiently dissipated to the outside of the package 10. For example, a material with a thermal conductivity of approximately 200 W / (m·K) or higher is preferable. Furthermore, a material with relatively high mechanical strength is preferable. For example, a metal plate made of aluminum, iron, nickel, copper, or an alloy containing these metals can be used, processed into the desired shape by stamping or etching. Furthermore, the surfaces of the lead terminals 14A and 14B are preferably coated with a metal film. Examples of suitable metal films include Ag, Ag alloys, Au, and Au alloys. Furthermore, a Ni-containing layer is preferably included as a base layer for the metal film. Examples of suitable base layers include Ni / Pd, Ni / Au, or Ni / Pd / Au. Examples of methods for forming the metal film include plating. By providing the lead terminal with such a metal film, it is possible to improve light reflectivity and / or bonding properties with a conductive wire, etc., which will be described later. The thickness of the lead terminal is, for example, 110 to 250 μm. The thickness of the lead terminal may vary partially due to the above-mentioned processing, etc. Furthermore, if the surface of the lead terminal is plated, the thickness or layer structure of the plating may vary partially.

[0060] [Light Emitting Element 20] The light emitting element 20 can suitably be a semiconductor light emitting element such as a light emitting diode (LED) chip or a semiconductor laser (LD) chip. The shape, size, etc. of the light emitting element 20 can be selected arbitrarily. The light emitting element 20 includes, for example, a semiconductor structure and a support substrate that supports the semiconductor structure. The semiconductor structure includes an n-side semiconductor layer, a p-side semiconductor layer, and an active layer sandwiched between the n-side semiconductor layer and the p-side semiconductor layer. The active layer may have a single quantum well (SQW) structure or a multiple quantum well (MQW) structure including multiple well layers. The semiconductor structure includes multiple semiconductor layers made of nitride semiconductors. The nitride semiconductors include In ｘ Al ｙ Ga １－ｘ－ｙThe term "active layer" includes semiconductors of all compositions in which the composition ratios x and y are varied within the respective ranges in a chemical formula of N (0≦x, 0≦y, x+y≦1). The emission peak wavelength of the active layer can be appropriately selected depending on the purpose. The active layer is configured to be able to emit, for example, visible light or ultraviolet light.

[0061] The light-emitting element 20 may have one semiconductor structure on one support substrate, or may have multiple semiconductor stacks on one support substrate. Furthermore, one semiconductor structure may have only one light-emitting layer, or may have multiple light-emitting layers. The structure of a semiconductor structure having multiple light-emitting layers may include multiple active layers between one n-side semiconductor layer and one p-side semiconductor layer, or may be a structure in which a structure including an n-side semiconductor layer, an active layer, and a p-side semiconductor layer in that order is repeated multiple times.

[0062] The light-emitting element 20 includes an n-electrode connected to the n-side semiconductor layer and a p-electrode connected to the p-side semiconductor layer. The p-electrode and the n-electrode may be disposed on different surfaces of the semiconductor laminate, or may be disposed on the same surface. Examples of the support substrate include an insulating substrate such as sapphire, and a nitride-based semiconductor substrate such as gallium nitride. Note that, in order to extract light emitted from the active layer through the support substrate, it is preferable to use a light-transmitting material for the support substrate. Note that the light-emitting element 20 may not have a support substrate.

[0063] In the present embodiment, as an example, the light emitting element 20 is disposed at a position shifted toward the inner surface from the center 11o of the bottom surface 11b of the recess 11 when viewed from above. In other words, the center of the light emitting element 20 and the center 11o of the bottom surface 11b of the recess do not coincide. By disposing the light emitting element 20 at a position closer to the inner surface than the center 11o of the bottom surface, it is possible to secure a connection area for wire bonds connecting the light emitting element to lead terminals and an area for mounting electronic components such as a protective element, which will be described later, while achieving a compact vehicle light emitting device.

[0064] [Protection Element 40] The protection element 40 is, for example, a Zener diode, and reduces the risk that the light emitting element 20 will be damaged by static electricity or the like.

[0065] [Sealing member 30] The sealing member 30 preferably has light-transmitting properties so as to transmit light emitted from the light-emitting element 20. Specifically, the sealing member 30 preferably contains a silicone resin as the base material 31. Examples of silicone resins that can be used include dimethyl silicone resin, methyl phenyl silicone resin, and phenyl silicone resin. Silicone resins have excellent heat resistance and light resistance, and are therefore preferable as the base material 31 of the sealing member 30. Alternatively, an epoxy resin may be used as the base material 31. Epoxy resins are generally known as resins that undergo a relatively large volume loss when cured, but by curing the epoxy resin while applying centrifugal force, it is possible to obtain a sealing member 30 with a flat upper surface.

[0066] The sealing member 30 may contain a filler in addition to the above-described base material 31. In this embodiment, the filler includes a wavelength conversion member 32. Examples of the wavelength conversion member 32 include a phosphor and quantum dots. Examples of the phosphor include an yttrium aluminum garnet phosphor (e.g., (Y, Gd) ３ (Al, Ga) ５ O １２ :Ce), lutetium aluminum garnet phosphors (e.g., Lu ３ (Al, Ga) ５ O １２ :Ce), terbium aluminum garnet phosphors (e.g., Tb ３ (Al, Ga) ５ O １２ :Ce), CCA-based phosphors (e.g., Ca １０ (P.O. ４ ) ６ Cl ２ :Eu), SAE-based phosphors (e.g., Sr ４ Al １４ O ２５ :Eu), chlorosilicate phosphors (e.g., Ca ８ MgSi ４ O １６ Cl ２ :Eu), silicate-based phosphors (e.g., (Ba, Sr, Ca, Mg) ２ SiO ４ :Eu), β-sialon-based phosphors (e.g., (Si, Al)３ (O, N) ４ :Eu) or α-sialon-based phosphor (e.g., Ca(Si,Al) １２ (O, N) １６ oxynitride phosphors such as (La,Y) ３ Si ６ N １１ :Ce), BSESN-based phosphors (e.g., (Ba, Sr) ２ Si ５ N ８ :Eu), SLA-based phosphors (e.g., SrLiAl ３ N ４ :Eu), CASN-based phosphors (e.g., CaAlSiN ３ :Eu) or SCASN-based phosphors (e.g., (Sr,Ca)AlSiN ３ nitride-based phosphors such as KSF-based phosphors (e.g., K ２ SiF ６ :Mn), KSAF-based phosphors (e.g., K ２ (Si １－ｘ Al ｘ ) F ６－ｘ :Mn where x satisfies 0<x<1) or MGF-based phosphor (for example, 3.5MgO.0.5MgF ２ GeO ２ Fluoride-based phosphors such as (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I) and quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I) ３ Here, FA and MA represent formamidinium and methylammonium, respectively.), II-VI quantum dots (e.g., CdSe), III-V quantum dots (e.g., InP), or quantum dots with a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se) ２ ) or the like can be used. A combination of multiple types of phosphors may be used. For example, color rendering properties and color reproducibility can be adjusted by using phosphors with different luminescent colors in a combination or blending ratio suitable for a desired color tone.

[0067] The sealing member 30 may contain a light-reflecting material as a filler. Examples of light-reflecting materials include silicon oxide (silica), titanium oxide, magnesium oxide, zirconium oxide, barium titanate, and aluminum oxide. When the light from the light-emitting element 20 or the light emitted from the wavelength conversion member 32 is irradiated onto the light-reflecting material, the light is reflected in random directions, which can further reduce unevenness in brightness, color, and the like of the light emitted from the vehicle light-emitting device 1.

[0068] The sealing member 30 may contain a light-absorbing material as a filler to the extent that translucency is not impaired. For example, black pigments such as carbon black and graphite can be used as the light-absorbing material. Dispersing such a filler in the sealing member can improve color unevenness of the vehicle light-emitting device 1 and reduce a decrease in display contrast.

[0069] The sealing member 30 may not contain the above-mentioned filler, or may contain one or more of the above-mentioned fillers. When the particles of the above-mentioned filler have a spherical shape, they tend to settle in the uncured base material 31. Therefore, light from the light-emitting element 20 tends to be emitted to the outside without being scattered near the upper surface of the sealing member 30. This allows the light extraction efficiency from the sealing member 30 to be improved.

[0070] The fluorescent properties of the phosphor used as the wavelength conversion member 32 may be degraded by moisture in the external environment, etc., depending on the composition of the constituent elements. When a phosphor with such properties is included in the sealing member 30, centrifugal force can be used to distribute the phosphor unevenly toward the bottom surface 11b of the recess 11 within the sealing member 30. This makes it possible to arrange the phosphor as far inside as possible from the top surface of the sealing member 30, which is the boundary with the external environment, and makes it possible to reduce the degradation caused by moisture in the external environment described above.

[0071] On the other hand, when the filler particles have a crushed shape, they have a larger surface area than spherical particles of the same size, so even when centrifugal force is applied, sedimentation is reduced in the uncured base material 31. Small particles are particularly resistant to the effects of centrifugal force. As a result, the filler can be positioned closer to the surface of the sealing member 30.

[0072] Therefore, when the sealing member 30 contains multiple types of filler, by utilizing the differences in the particle shapes of the fillers, it is possible to disperse some fillers uniformly throughout the sealing member 30 and to cause other fillers to be unevenly distributed toward the bottom surface 11b of the recess 11, even when centrifugal force is applied.

[0073] The vehicle light emitting device according to the present disclosure is not limited to the structures shown in FIGS. 1 to 4 and may have any structure as long as it is capable of emitting light within the range of the ECE standard, with a correlated color temperature greater than 5000 K and equal to or less than 7000 K, and a color deviation duv of -0.02 or greater and equal to or less than -0.006. For example, the vehicle light emitting device may have a structure in which a plate-shaped wavelength conversion member containing a phosphor is mounted on the upper surface of the light emitting element via a bonding member. In this case, a wavelength conversion member having high heat resistance, such as a wavelength conversion member formed by applying a resin composition containing a phosphor to a light-transmitting body made of heat-resistant glass, or a sintered body containing a phosphor and a light-transmitting material, may be used.

[0074] Furthermore, it is possible to realize a vehicle headlamp including a vehicle light emitting device according to the present disclosure and an optical element capable of irradiating at least a portion of light from the vehicle light emitting device according to the present disclosure toward the front of the vehicle. Examples of the optical element include a lens and a reflector. An example of a vehicle headlamp is shown below.

[0075] Fig. 8 is a perspective view that schematically shows a vehicle headlamp that includes the vehicle light emitting device according to this embodiment. Fig. 9 is a longitudinal cross-sectional view taken along line IX-IX in Fig. 8. In Figs. 8 and 9, the direction that passes through the center 30o of the upper surface of the sealing member 30 of the vehicle light emitting device 1 and is perpendicular to the upper surface of the sealing member 30 is referred to as the "first direction Z." The direction that is perpendicular to the first direction Z is referred to as the "second direction X." The direction that is perpendicular to the first direction Z and the second direction X is referred to as the "third direction Y."

[0076] As illustrated in FIGS. 8 and 9 , the vehicle headlamp 100 includes the vehicle light emitting device 1 , a substrate 110 , a reflector 130 , and a lens 140 .

[0077] The vehicle light emitting device 1 is disposed on the upper surface of a substrate 110. The substrate 110 is, for example, a wiring substrate having an insulating layer and wiring electrically connected to the vehicle light emitting device 1. The substrate 110 has, for example, a flat plate shape, with its upper and lower surfaces being generally flat and generally parallel to the XY plane including the second direction X and the third direction Y. However, the shape of the substrate 110 is not limited to the above. For example, the substrate 110 may be curved.

[0078] The reflector 130 is disposed on the upper surface of the substrate 110. The reflector 130 reflects light emitted from the vehicle light emitting device 1 toward the lens 140. The reflector 130 is, for example, a concave mirror that opens toward the substrate 110 and the lens 140. The surface of the reflector 130 includes a reflective surface 131 facing the upper surface of the sealing member 30, an outer surface 132 located on the opposite side of the reflective surface 131, a first end surface 133 located between the reflective surface 131 and the outer surface 132 and facing the substrate 110, and a second end surface 134 located between an edge of the reflective surface 131 facing the lens 140 in the second direction X and an edge of the outer surface 132 facing the lens 140 in the second direction X.

[0079] In this embodiment, the reflecting surface 131 is made up of a part of a spheroid A. The spheroid A is a surface obtained by rotating an ellipse around a major axis A1. The major axis A1 extends generally in the second direction X. The spheroid A also has two focal points F1 and F2. The major axis A1 passes through the two focal points F1 and F2 and is generally perpendicular to the normal N at the center 30o of the upper surface of the sealing member 30.

[0080] In this embodiment, the reflecting surface 131 is formed by a region of the spheroid A that is surrounded by a first plane P1 that is located above the major axis A1 and parallel to the second direction X and the third direction Y, and a second plane P2 that is located between the two focal points F1 and F2 and parallel to the first direction Z and the third direction Y. Therefore, the reflecting surface 131 intersects with the major axis A1 at an intersection F0. However, the shape of the reflecting surface is not limited to the above.

[0081] The outer surface 132 is curved in the same manner as the reflecting surface 131. The first end surface 133 is, for example, a flat surface and is generally parallel to the second direction X and the third direction Y. In this embodiment, the first end surface 133 is disposed below the intersection point F0. However, the position of the first end surface in the first direction may be the same as the position of the intersection point in the first direction. The second end surface 134 is, for example, a flat surface and is generally parallel to the first direction Z and the third direction Y. However, the specific shapes of the outer surface, the first end surface, and the second end surface are not limited to those described above.

[0082] The reflector 130 is disposed so that the position of the focal point F1 roughly coincides with the position of the center 30o, and the focal point F2 is located between the reflecting surface 131 and the lens 140. Therefore, the light emitted from the center 30o is reflected by the reflecting surface 131 and is condensed roughly at the focal point F2 before entering the lens 140. However, the focal point F1 does not necessarily have to be located on the center 30o, and it is sufficient that the focal point F1 is located at least on the upper surface of the sealing member 30, which is the light-emitting surface.

[0083] The reflector 130 is mainly made of a resin material, and a reflective film such as a metal film or a dielectric multilayer film is provided on the reflective surface 131. However, the reflector may be made of a metal material.

[0084] The lens 140 is, for example, a convex lens. The lens 140 is made of a light-transmitting material. The lens 140 is disposed so as to be spaced apart from the substrate 110 in the X direction.

[0085] Lens 140 has an incident surface 141 onto which light reflected by reflecting surface 131 enters, an exit surface 142 located on the opposite side of incident surface 141 and from which light that enters lens 140 from incident surface 141 exits, a first flat surface 143 located between incident surface 141 and exit surface 142, and a second flat surface 144 located between incident surface 141 and exit surface 142 and on the opposite side of first flat surface 143.

[0086] The incident surface 141 is, for example, a flat surface and is substantially parallel to the first direction Z and the third direction Y. The exit surface 142 is, for example, a convex curved surface.

[0087] The first flat surface 143 and the second flat surface 144 are, for example, generally parallel to the second direction X and the third direction Y. The first flat surface 143 corresponds to the upper surface, and the second flat surface 144 corresponds to the lower surface. The first flat surface 143 is located above the upper surface of the substrate 110. The second flat surface 144 is located below the lower surface of the substrate 110.

[0088] However, the specific shape of the lens is not limited to the above. For example, the upper and lower surfaces of the lens may be curved instead of flat. Furthermore, from the viewpoint of preventing light from entering the first flat surface 143 and the second flat surface 144 or from emitting light from the first flat surface 143 and the second flat surface 144, the first flat surface 143 and the second flat surface 144 may be covered with a light-shielding member. This can prevent stray light from occurring.

[0089] In this embodiment, the position of the focal point of the lens 140 roughly coincides with the position of the focal point F2 of the reflecting surface 131. However, the position of the focal point of the lens 140 may be shifted from the position of the focal point F2 of the reflecting surface 131.

[0090] Most of the light L1 emitted from the center 30o of the upper surface of the sealing member 30 of the vehicle light emitting device 1 is reflected by the reflecting surface 131. Most of the light L1 reflected by the reflecting surface 131 is incident on the lens 140. The light L1 emitted from the lens 140 can be used as a high beam or a low beam. When the light L1 emitted from the lens 140 is used as a low beam, a light blocking member for forming a cutoff line may be disposed between the lens 140 and the reflector 130. In this case, the light blocking member may be disposed on the focal point F2.

[0091] Because the vehicle headlamp 100 includes the vehicle light emitting device 1, it is capable of emitting light that is within the range of the ECE standard, has a correlated color temperature higher than 5000 K and equal to or lower than 7000 K, and has a color deviation duv of -0.02 to -0.006. The color deviation duv may be equal to or higher than -0.02 and equal to or lower than -0.01. This allows the vehicle headlamp 100 to achieve the same effects as the vehicle light emitting device 1.

[0092] In the vehicle headlamp 100, the color deviation duv is preferably -0.017 or more and -0.006 or less. The color deviation duv may be -0.017 or more and -0.01 or less. This allows the vehicle headlamp 100 to achieve the same effects as the vehicle light emitting device 1. Furthermore, in the vehicle headlamp 100, the correlated color temperature is preferably 5500 K or more and 6500 K or less. This allows the vehicle headlamp 100 to achieve the same effects as the vehicle light emitting device 1. In the vehicle headlamp 100, the correlated color temperature may be 5600 K or more and 6300 K or less, or may be 5800 K or more and 6100 K or less.

[0093] Furthermore, the vehicle headlamp 100 is capable of emitting light having an average color rendering index Ra greater than 66 and less than 80. This allows the vehicle headlamp 100 to achieve the same effects as the vehicle light emitting device 1. The vehicle headlamp 100 may be capable of emitting light having an average color rendering index Ra of 80 or greater. This allows the vehicle headlamp 100 to achieve the same effects as the vehicle light emitting device 1. The vehicle headlamp 100 may be capable of emitting light having a color deviation duv of greater than -0.02 and less than -0.012, and having an average color rendering index Ra greater than 66 and less than 70.

[0094] In the emission spectrum of the vehicle headlamp 100, the integral value of the emission intensity in the wavelength range of 620 nm to 780 nm is preferably 45% to 60% of the integral value of the emission intensity in the wavelength range of 380 nm to 470 nm. This allows the vehicle headlamp 100 to achieve the same effects as the vehicle light emitting device 1. The red component / blue component ratio may be 52% to 60%.

[0095] The above describes preferred embodiments in detail, but the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0096] In addition to the above embodiments, the following supplementary notes are further disclosed. (Supplementary Note 1) A light emitting device for a vehicle capable of emitting light within the range of the ECE standard, having a correlated color temperature higher than 5000K and equal to or lower than 7000K, and having a color deviation duv of -0.02 or more and equal to or lower than -0.01. (Supplementary Note 2) The light emitting device for a vehicle according to Supplementary Note 1, wherein the color deviation duv is -0.017 or more and equal to or lower than -0.01. (Supplementary Note 3) The light emitting device for a vehicle according to Supplementary Note 1 or 2, wherein the correlated color temperature is 5500K or more and equal to or lower than 6500K. (Supplementary Note 4) The light emitting device for a vehicle according to any one of Supplements 1 to 3, capable of emitting light having an average color rendering index Ra of 80 or more. (Supplementary Note 5) The vehicle light emitting device according to any one of Supplementary Notes 1 to 4, comprising: a light emitting element having an emission peak wavelength in the range of 400 nm or more and 460 nm or less; and a phosphor that emits light by absorbing at least a portion of the light from the light emitting element, wherein the phosphor includes a first phosphor having an emission peak wavelength in the range of 500 nm or more and less than 560 nm. (Supplementary Note 6) The vehicle light emitting device according to Supplementary Note 5, wherein the phosphor further includes a second phosphor having an emission peak wavelength in the range of 560 nm or more and less than 620 nm. (Supplementary Note 7) The vehicle light emitting device according to Supplementary Note 5, wherein the first phosphor includes a phosphor having a composition represented by the following formula [1A]. (Y ａ , Lu １－ａ ) ｘ (Al ｂ , Ga １－ｂ ) ｙ O １２ : Ce ｚ [1A] (In the formula [1A], a, b, x, y, and z satisfy 0≦a≦1, 0≦b≦1, 2.8≦x≦3.2, 4.8≦y≦5.2, and 0.009≦z≦0.6.) (Appendix 8) The light emitting device for a vehicle according to appendix 6, wherein the second phosphor includes at least one selected from the group consisting of phosphors having a composition represented by the following formula [2A] and phosphors having a composition represented by the following formula [2B]. (Y ａ , Gd １－ａ ) ｘ Al ｙ O １２ : Ce ｚ[2A] (wherein x, y, and z satisfy 0≦a≦1, 2.8≦x≦3.2, 4.8≦y≦5.2, and 0.009≦z≦0.6), Ca ｓ Sr ｔ EU ｕ Si ｖ Al ｗ N ｘ[2B] (In the formula [2B], s, t, u, v, w and x satisfy 0<s<1, 0≦t<1, 0.002≦u≦0.08, 0.8≦s+t+u≦1.1, 0.8≦v≦1.2, 0.8≦w≦1.2, 1.8≦v+w≦2.2, 2.5≦x≦3.2.) (Appendix 9) A vehicle headlamp comprising: the vehicle light emitting device according to any one of Appendices 1 to 8; and an optical member capable of irradiating at least a portion of light from the vehicle light emitting device ahead of the vehicle. (Appendix 10) The vehicle light emitting device according to any one of Appendices 1 to 8, wherein the correlated color temperature is 5800K or more and 6100K or less. (Supplementary Note 11) A light emitting device for a vehicle capable of emitting light that is within the range of the ECE standard, has a correlated color temperature higher than 5000K and equal to or lower than 7000K, and has a color deviation duv of -0.02 or more and -0.006 or less. (Supplementary Note 12) A light emitting device for a vehicle according to Supplementary Note 11, capable of emitting light having an average color rendering index Ra of greater than 66 and less than 80. (Supplementary Note 13) A light emitting device for a vehicle according to Supplementary Note 11, capable of emitting light having the color deviation duv of -0.02 or more and less than -0.012, and an average color rendering index Ra of greater than 66 and less than 70. (Supplementary Note 14) A light emitting device for a vehicle according to any one of Supplementary Notes 11 to 13, wherein, in an emission spectrum, an integrated value of emission intensity in a wavelength range of 620nm to 780nm is 45% to 60% of an integrated value of emission intensity in a wavelength range of 380nm to 470nm. (Supplementary Note 15) The vehicular light emitting device according to any one of Supplementary Notes 11 to 14, wherein the correlated color temperature is 5800K or more and 6100K or less. (Supplementary Note 16) A vehicular headlamp capable of emitting light within the range of the ECE standard, having a correlated color temperature higher than 5000K and 7000K or less, and having a color deviation duv of -0.02 or more and -0.006 or less. (Supplementary Note 17) The vehicular headlamp according to Supplementary Note 16, capable of emitting light having an average color rendering index Ra of greater than 66 and less than 80. (Supplementary Note 18) The vehicular headlamp according to Supplementary Note 16, capable of emitting light having a color deviation duv of -0.02 or more and less than -0.012, and having an average color rendering index Ra of greater than 66 and less than 70.(Supplementary Note 19) The vehicle headlamp according to any one of Supplementary Notes 16 to 18, wherein in the emission spectrum, an integrated value of the emission intensity in a wavelength range of 620 nm to 780 nm is 45% to 60% of an integrated value of the emission intensity in a wavelength range of 380 nm to 470 nm. (Supplementary Note 20) The vehicle headlamp according to any one of Supplementary Notes 16 to 19, wherein the correlated color temperature is 5800 K to 6100 K.

[0097] This international application claims priority based on Japanese Patent Application No. 2024-144275 filed on August 26, 2024, and Japanese Patent Application No. 2025-73502 filed on April 25, 2025. The entire contents of Japanese Patent Application No. 2024-144275 and Japanese Patent Application No. 2025-73502 are incorporated by reference into this international application.

[0098] 1 Vehicle light emitting device 10 Package 10a Upper surface 10b Lower surface 10c, 10d, 10e, 10f Side surface 11 Recess 11b Bottom surface 11c Inner surface 11o Center of bottom surface 13 Base 14A, 14B Lead terminal 20 Light emitting element 21A, 21B, 22A Conductive wire 30 Sealing member 30o Center 31 Base material 32 Wavelength conversion member 40 Protective element 100 Vehicle headlamp 110 Substrate 130 Reflector 131 Reflecting surface 132 Outer surface 133 First end surface 134 Second end surface 140 Lens 141 Incident surface 142 Emitting surface 143 First flat surface 144 Second flat surface 200, 300 Box 201, 301 Visual object 202, 302 Light source 400 Horizontal plane 500 Evaluator A Spheroid A1 Major axis F0 Intersection F1, F2 Focus L1 Light N Normal P1 First plane P2 Second plane

Claims

1. A lighting device for a vehicle that is capable of emitting light within the range of ECE standards, has a correlated color temperature higher than 5000K and equal to or lower than 7000K, and has a color deviation duv of -0.02 or more and equal to or lower than -0.

01.

2. The vehicle light emitting device according to claim 1, wherein the color deviation duv is not less than -0.017 and not more than -0.

01.

3. The vehicle light emitting device according to claim 1 or 2, wherein the correlated color temperature is 5500K or more and 6500K or less.

4. The vehicle light emitting device according to any one of claims 1 to 3, capable of emitting light having an average color rendering index Ra of 80 or more.

5. A light emitting device for a vehicle according to any one of claims 1 to 4, comprising: a light emitting element having an emission peak wavelength in the range of 400 nm or more and 460 nm or less; and a phosphor that absorbs at least a portion of the light from the light emitting element and emits light, wherein the phosphor includes a first phosphor having an emission peak wavelength in the range of 500 nm or more and less than 560 nm.

6. The vehicle light emitting device according to claim 5, wherein the phosphor further includes a second phosphor having an emission peak wavelength in the range of 560 nm or more and less than 620 nm.

7. The light emitting device for a vehicle according to claim 5, wherein the first phosphor includes a phosphor having a composition represented by the following formula [1A]: (Y ａ , Lu １－ａ ) ｘ (Al ｂ , Ga １－ｂ ) ｙ O １２ : Ce ｚ [1A] (In the formula [1A], a, b, x, y, and z satisfy 0≦a≦1, 0≦b≦1, 2.8≦x≦3.2, 4.8≦y≦5.2, and 0.009≦z≦0.6.) 8. The vehicle light emitting device according to claim 6, wherein the second phosphor comprises at least one selected from the group consisting of phosphors having a composition represented by the following formula [2A] and phosphors having a composition represented by the following formula [2B]. (Y ａ , Gd １－ａ ) ｘ Al ｙ O １２ : Ce ｚ [2A] (wherein x, y, and z satisfy 0≦a≦1, 2.8≦x≦3.2, 4.8≦y≦5.2, and 0.009≦z≦0.6), Ca ｓ Sr ｔ EU ｕ Si ｖ Al ｗ N ｘ [2B] (In the formula [2B], s, t, u, v, w, and x satisfy 0<s<1, 0≦t<1, 0.002≦u≦0.08, 0.8≦s+t+u≦1.1, 0.8≦v≦1.2, 0.8≦w≦1.2, 1.8≦v+w≦2.2, and 2.5≦x≦3.2.) 9. A vehicle headlamp comprising a vehicle light emitting device according to any one of claims 1 to 8 and an optical member capable of irradiating at least a portion of the light from the vehicle light emitting device ahead of the vehicle.

10. The vehicle light emitting device according to any one of claims 1 to 8, wherein the correlated color temperature is 5800K or more and 6100K or less.

11. A light emitting device for a vehicle capable of emitting light that is within the range of ECE standards, has a correlated color temperature higher than 5000K and equal to or lower than 7000K, and has a color deviation duv of -0.02 or more and equal to or lower than -0.

006.

12. The vehicle light emitting device according to claim 11, which is capable of emitting light having an average color rendering index Ra of greater than 66 and less than 80.

13. The vehicle light emitting device according to claim 11, capable of emitting light having the color deviation duv of -0.02 or more and less than -0.012, and an average color rendering index Ra of 66 or more and less than 70.

14. A vehicle light-emitting device according to any one of claims 11 to 13, wherein in the emission spectrum, the integral value of the emission intensity in the wavelength range of 620 nm or more and 780 nm or less is 45% or more and 60% or less of the integral value of the emission intensity in the wavelength range of 380 nm or more and 470 nm or less.

15. The vehicle light emitting device according to any one of claims 11 to 14, wherein the correlated color temperature is 5800K or more and 6100K or less.

16. A vehicle headlamp capable of emitting light that is within the scope of ECE standards, has a correlated color temperature higher than 5000K and equal to or lower than 7000K, and has a color deviation duv of -0.02 or more and equal to or lower than -0.

006.

17. A vehicle headlamp according to claim 16, capable of emitting light having an average color rendering index Ra of greater than 66 and less than 80.

18. The vehicle headlamp according to claim 16, capable of emitting light having a color deviation duv of -0.02 or more and less than -0.012, and an average color rendering index Ra of 66 or more and less than 70.

19. A vehicle headlamp as claimed in any one of claims 16 to 18, wherein in the emission spectrum, the integral value of the emission intensity in the wavelength range of 620 nm to 780 nm is 45% to 60% of the integral value of the emission intensity in the wavelength range of 380 nm to 470 nm.

20. A vehicle headlamp according to any one of claims 16 to 19, wherein the correlated color temperature is 5800K or higher and 6100K or lower.

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