Light-emitting device

Abstract

To provide a light-emitting device capable of improving color mixing. [Solution] The light-emitting device 1 has a support having a first recess 101 and a second recess 102 partitioned by a wall portion 33, wherein the area of ​​the first bottom surface 101a defining the first recess in a top view is larger than the area of ​​the second bottom surface 102a defining the second recess; a first light-emitting element 41 and a second light-emitting element 42 located in the first recess; a third light-emitting element 43 located in the second recess; a first light-transmitting member 71 located in the first recess and having a first wavelength conversion member having a longer emission peak wavelength than the emission peak wavelength of the first light-emitting element, overlapping with the first and second light-emitting elements in a top view and located away from the third light-emitting element in a top view; and a second light-transmitting member 72 located in the second recess and overlapping with the third light-emitting element in a top view, wherein the emission peak wavelength of the first light-emitting element, each of which can be driven independently, is longer than the emission peak wavelength of the second light-emitting element and the emission peak wavelength of the third light-emitting element.

Description

[Technical Field]

[0001] This disclosure relates to a light-emitting device. [Background technology]

[0002] Generally, light-emitting devices using light-emitting elements such as light-emitting diodes are widely used as various light sources for lighting fixtures and the like. As an example of such a light-emitting device, Patent Document 1 discloses a light-emitting device comprising: a first light-emitting element and a second light-emitting element that can be driven independently; a wall separating the first light-emitting element and the second light-emitting element; a first translucent member separated from the second light-emitting element by the wall, covering at least a part of the side surface of the first light-emitting element and including a first wavelength conversion member; and a second translucent member that, in a top view, covers the first light-emitting element, the second light-emitting element, and the first translucent member and includes a second wavelength conversion member, wherein the emission peak wavelength of the first wavelength conversion member is longer than the emission peak wavelength of the second wavelength conversion member. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-56834 [Overview of the project] [Problems that the invention aims to solve]

[0004] This disclosure aims to provide a light-emitting device capable of improving color mixing. [Means for solving the problem]

[0005] A light-emitting device according to one embodiment of the present disclosure includes a support having a first recess and a second recess partitioned by a wall, wherein the area of ​​a first bottom surface defining the first recess is larger than the area of ​​a second bottom surface defining the second recess in a top view; a first light-emitting element and a second light-emitting element located within the first recess; a third light-emitting element located within the second recess; a first light-transmitting member located within the first recess and having an emission peak wavelength longer than the emission peak wavelength of the first light-emitting element, overlapping with the first and second light-emitting elements in a top view and located away from the third light-emitting element in a top view; and a second light-transmitting member located within the second recess and overlapping with the third light-emitting element in a top view, wherein the first, second, and third light-emitting elements are independently drivable, and the emission peak wavelength of the first light-emitting element is longer than the emission peak wavelength of the second and third light-emitting elements. [Effects of the Invention]

[0006] According to one embodiment of the present disclosure, it is possible to provide a light-emitting device capable of improving color mixing. [Brief explanation of the drawing]

[0007] [Figure 1A] This is a schematic top view illustrating a light-emitting device according to the first embodiment. [Figure 1B] This is a schematic cross-sectional view along the IB-IB line in Figure 1A. [Figure 2] This is a schematic top view of the light-emitting device shown in Figure 1, with the first and second translucent members removed. [Figure 3] This is a schematic cross-sectional view illustrating a light-emitting device according to a modified example 1 of the first embodiment. [Figure 4] This is a schematic cross-sectional view illustrating a light-emitting device according to a modified example 2 of the first embodiment. [Figure 5] This is a schematic top view illustrating a light-emitting device according to a modified example 3 of the first embodiment. [Figure 6] This is a schematic cross-sectional view (1) illustrating a light-emitting device according to a modified example 4 of the first embodiment. [Figure 7] It is a schematic cross-sectional view (2) illustrating a light-emitting device according to Modification Example 4 of the First Embodiment. [Figure 8] It is a schematic cross-sectional view illustrating a light-emitting device according to Modification Example 5 of the First Embodiment. [Figure 9] It is a schematic cross-sectional view illustrating a light-emitting device according to Modification Example 6 of the First Embodiment. [Figure 10] It is a schematic cross-sectional view illustrating a light-emitting device according to Modification Example 7 of the First Embodiment.

Mode for Carrying Out the Invention

[0008] Hereinafter, modes for carrying out the invention will be described with reference to the drawings. In the following description, terms indicating specific directions or positions (for example, "up", "down", and other terms including those terms) are used as necessary. However, the use of those terms is for facilitating the understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meanings of those terms. Also, parts denoted by the same reference numerals in a plurality of drawings indicate the same or equivalent parts or members.

[0009] Furthermore, the embodiments shown below illustrate light-emitting devices and the like for embodying the technical idea of the present invention, and do not limit the present invention thereto. Also, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are not intended to limit the scope of the present invention thereto only without specific description, but are intended to be illustrative. Also, the content described in one embodiment is applicable to other embodiments and modification examples. Also, the sizes and positional relationships of the members shown in the drawings may be exaggerated for clarity of explanation. Furthermore, in order to avoid making the drawings overly complex, a schematic diagram omitting the illustration of some elements may be used, or an end view showing only the cut surface as a cross-sectional view may be used.

[0010] 〈First Embodiment〉 The light-emitting device according to this disclosure includes a support having a first recess and a second recess partitioned by a wall, wherein the area of ​​a first bottom surface defining the first recess is larger than the area of ​​a second bottom surface defining the second recess in a top view; a first light-emitting element and a second light-emitting element located within the first recess; a third light-emitting element located within the second recess; a first light-transmitting member located within the first recess and having an emission peak wavelength longer than the emission peak wavelength of the first light-emitting element, overlapping with the first and second light-emitting elements in a top view and located away from the third light-emitting element in a top view; and a second light-transmitting member located within the second recess and overlapping with the third light-emitting element in a top view, wherein the first, second and third light-emitting elements are independently drivable, and the emission peak wavelength of the first light-emitting element is longer than the emission peak wavelength of the second light-emitting element and the emission peak wavelength of the third light-emitting element.

[0011] [Light-emitting device 1] As an example of a light-emitting device according to this disclosure, light-emitting device 1 will be described. Figure 1A is a schematic top view illustrating a light-emitting device according to the first embodiment. Figure 1B is a schematic cross-sectional view along the line IB-IB in Figure 1A. Figure 2 is a schematic top view of the light-emitting device shown in Figure 1 with the first translucent member and the second translucent member removed.

[0012] In each drawing, for reference, mutually orthogonal X, Y, and Z axes are shown as needed. The direction parallel to the X-axis is called the first direction X, the direction parallel to the Y-axis is called the second direction Y, and the direction parallel to the Z-axis is called the third direction Z. Furthermore, in the first direction X, the direction the arrow is pointing is called the +X direction, and the opposite direction of the +X direction is called the -X direction. In the second direction Y, the direction the arrow is pointing is called the +Y direction, and the opposite direction of the +Y direction is called the -Y direction. In the third direction Z, the direction the arrow is pointing is called the +Z direction, and the opposite direction of the +Z direction is called the -Z direction. However, these do not restrict the orientation when using the light-emitting device, and the orientation of the light-emitting device is arbitrary. Also, viewing an object from the +Z direction toward the -Z direction is called a top view.

[0013] The light-emitting device 1 illustrated in Figures 1A, 1B, and 2 comprises a support 10, a first light-emitting element 41, a second light-emitting element 42, and a third light-emitting element 43, a wire 60, a first light-transmitting member 71, and a second light-transmitting member 72. The first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 are sometimes referred to as light-emitting elements.

[0014] The support 10 comprises a lead 20 and a resin molded body 30. The lead 20 is held by the resin molded body 30.

[0015] The lead 20 is conductive and can function as an electrode for supplying power to the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43. The lead 20 includes a first lead 21, a second lead 22, a third lead 23, a fourth lead 24, a fifth lead 25, and a sixth lead 26. The first lead 21, the second lead 22, the third lead 23, the fourth lead 24, the fifth lead 25, and the sixth lead 26 are separated from each other via a resin molded body 30.

[0016] The resin molded body 30 may include a bottom portion 31, a frame portion 32, and a wall portion 33. The bottom portion 31 covers the side surface of the lead 20. The frame portion 32 protrudes in the +Z direction on the outer circumference of the bottom portion 31 and surrounds the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 in a top view. The frame portion 32 may be integral with the bottom portion 31 or it may be a separate part. In a top view, the wall portion 33 is located inside the frame portion 32, between the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43. The wall portion 33 may be integral with the bottom portion 31 or it may be a separate part. In this embodiment, the wall portion 33 and the bottom portion 31 are separate parts. With respect to the top surface of the lead 20, the height of the wall portion 33 may be 0.9 times or more and 1.1 times or less the height of the frame portion 32. In this embodiment, the height of the wall portion 33 is the same as the height of the frame portion 32.

[0017] The support 10 has a first recess 101 and a second recess 102, which are demarcated by the wall portion 33. The first recess 101 and the second recess 102 are located inside the frame portion 32 when viewed from above. In this specification, "inside the frame portion 32 when viewed from above" means that, when viewed from above, they are located closer to the center of the light-emitting device 1 than the frame portion 32. Also, the center of the light-emitting device 1 when viewed from above means the geometric centroid of the light-emitting device 1 when viewed from above. The first recess 101 is defined by the first bottom surface 101a, the inner surface of the frame portion 32, and the inner surface of the wall portion 33. The first bottom surface 101a is composed of the upper surfaces of the first lead 21, the second lead 22, the third lead 23, the fourth lead 24, and the fifth lead 25, as well as the upper surface of the bottom portion 31. The second recess 102 is defined by the second bottom surface 102a, the inner surface of the frame portion 32, and the inner surface of the wall portion 33. The second bottom surface 102a is formed by the upper surfaces of the first lead 21 and the sixth lead 26, respectively, and the upper surface of the bottom portion 31. In a top view, the area of ​​the first bottom surface 101a defining the first recess 101 is larger than the area of ​​the second bottom surface 102a defining the second recess 102. The area of ​​the first bottom surface 101a may be 1.5 times or more and 2.5 times or less the area of ​​the second bottom surface 102a.

[0018] The first light-emitting element 41 and the second light-emitting element 42 are located within the first recess 101. More specifically, the first light-emitting element 41 and the second light-emitting element 42 are located on a first lead 21 exposed within the first recess 101 and are electrically connected to any point on the lead 20 by a wire 60. The third light-emitting element 43 is located within the second recess 102. More specifically, the third light-emitting element 43 is located on a first lead 21 exposed within the second recess 102 and is electrically connected to any point on the lead 20 by a wire 60.

[0019] The emission peak wavelength of the first light-emitting element 41 is longer than the emission peak wavelengths of the second light-emitting element 42 and the third light-emitting element 43. The emission peak wavelengths of the second light-emitting element 42 and the third light-emitting element 43 may be the same or different. For example, the first light-emitting element 41 may emit green light (peak wavelength 495 nm to 565 nm), and the second and third light-emitting elements 42 and 43 may emit blue light (peak wavelength 430 nm to 490 nm). The first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 can be driven independently.

[0020] The first light-emitting element 41 and the third light-emitting element 43 may be positioned side by side in the first direction X. In this case, it is preferable that the length of the third light-emitting element 43 in the first direction X is shorter than the length of the third light-emitting element 43 in the second direction Y which is perpendicular to the first direction X. This makes it possible to miniaturize the light-emitting device 1 in the first direction X.

[0021] In the illustrated example, the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 are rectangular in shape when viewed from above. The longer sides of each of the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 are parallel to the second direction Y, and their shorter sides are parallel to the first direction X. The first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 are positioned side by side in the first direction X. In a top view, the centers of the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 may be located on a virtual straight line parallel to the first direction X. The longer sides of the first light-emitting element 41 and the second light-emitting element 42 face each other. The opposing longer sides of the first light-emitting element 41 and the second light-emitting element 42, which have different emission peak wavelengths, improve the color mixing properties of the light-emitting device 1.

[0022] The first light-transmitting member 71 is located within the first recess 101. In this embodiment, the first light-transmitting member 71 includes a first wavelength conversion member having an emission peak wavelength longer than the emission peak wavelength of the first light-emitting element 41. For example, if the first light-emitting element 41 emits green light (peak wavelength 495 nm to 565 nm), the first wavelength conversion member may be a red phosphor (peak wavelength 610 nm to 700 nm).

[0023] The first light-transmitting member 71 overlaps with the first light-emitting element 41 and the second light-emitting element 42 in a top view, and is positioned away from the third light-emitting element 43 in a top view. The first light-transmitting member 71 covers the top and side surfaces of the first light-emitting element 41 and the second light-emitting element 42. The first light-transmitting member 71 is not located within the second recess 102.

[0024] The second light-transmitting member 72 is located within the second recess 102. The second light-transmitting member 72 overlaps with the third light-emitting element 43 when viewed from above. The second light-transmitting member 72 covers the top and side surfaces of the third light-emitting element 43. In this embodiment, the second light-transmitting member 72 does not include a wavelength conversion member. Note that "not including a wavelength conversion member" means that the unavoidable inclusion of a wavelength conversion member is not ruled out, for example, that the content of the wavelength conversion member is 0.05% by weight or less.

[0025] In another embodiment, the first light-transmitting member 71 may not include a wavelength conversion member, and the second light-transmitting member 72 may include a first wavelength conversion member having an emission peak wavelength longer than the emission peak wavelength of the first light-emitting element 41. When the first light-transmitting member 71 includes a first wavelength conversion member, the light emitted by the first light-emitting element 41 and the light emitted by the second light-emitting element 42 are scattered by the first wavelength conversion member, thus increasing light absorption. In contrast, when the second light-transmitting member 72 includes a first wavelength conversion member, only the light emitted by the third light-emitting element 43 is scattered by the first wavelength conversion member, thus reducing light absorption. This improves the light extraction efficiency of the light-emitting device 1.

[0026] At least a portion of the upper surface of the frame portion 32, the upper surface of the wall portion 33, the upper surface of the first translucent member 71, and the upper surface of the second translucent member 72 may be on the same plane.

[0027] When the light-emitting device 1 is driven, current is supplied from an external power source via the lead 20 to the first light-emitting element 41, the second light-emitting element 42, and / or the third light-emitting element 43, causing the first light-emitting element 41, the second light-emitting element 42, and / or the third light-emitting element 43 to emit light. The light from the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 includes light traveling upward, light traveling sideways, and light traveling downward from each respective light-emitting element. The light emitted from the light-emitting device 1 includes light emitted by the first light-emitting element 41 that passes through the first light-transmitting member 71, light emitted by the second light-emitting element 42 that passes through the first light-transmitting member 71, and light emitted by the third light-emitting element 43 that passes through the second light-transmitting member 72.

[0028] Thus, the light-emitting device 1 has a first light-emitting element 41 and a second light-emitting element 42 located in the first recess 101, and a third light-emitting element 43 located in the second recess 102, and these light-emitting elements can be driven independently. Furthermore, the light-emitting device 1 has a first translucent member 71 located in the first recess 101, overlapping with the first light-emitting element 41 and the second light-emitting element 42 in a top view, and located away from the third light-emitting element 43 in a top view. In addition, the emission peak wavelength of the first light-emitting element 41 is longer than the emission peak wavelength of the second light-emitting element 42 and the emission peak wavelength of the third light-emitting element 43. The first translucent member 71 includes a first wavelength conversion member having an emission peak wavelength longer than the emission peak wavelength of the first light-emitting element 41.

[0029] With this configuration, a light-emitting device 1 capable of improving color mixing can be realized. Specifically, for example, the first light-emitting element 41 emits green light, the second light-emitting element 42 and the third light-emitting element 43 emit blue light, and the first wavelength conversion member of the first translucent member 71 is a red phosphor. In this case, the green light emitted by the first light-emitting element 41, the red light emitted by the second light-emitting element 42 and wavelength-converted by the first translucent member 71, and the blue light emitted by the third light-emitting element 43 are mixed, and white light is emitted from the light-emitting device 1. Because the area of ​​the first bottom surface defining the first recess is large, it is easier to increase the volume of the first translucent member 71 located in the first recess compared to the case where the area of ​​the first bottom surface is smaller than the area of ​​the second bottom surface. This makes it easier for the green light emitted by the first light-emitting element 41, the blue light emitted by the second light-emitting element 42, and the red light emitted by the second light-emitting element 42 and wavelength-converted by the first light-transmitting member 71 to mix within the first light-transmitting member 71. This improves the color mixing ability of the light-emitting device 1. In addition, because the area of ​​the first bottom surface defining the first recess is large, it is easier to increase the area of ​​the first light-transmitting member 71 in a top view compared to the case where the area of ​​the first bottom surface is smaller than the area of ​​the second bottom surface. This allows the green light emitted by the first light-emitting element 41, the blue light emitted by the second light-emitting element 42, and the red light emitted by the second light-emitting element 42 and wavelength-converted by the first light-transmitting member 71 to mix within a relatively large area of ​​the first light-transmitting member 71 in a top view. This makes it possible to obtain white light over a relatively large area.

[0030] The details of each component included in the light-emitting device 1 are described below.

[0031] (Lead 20) Parts of the upper surfaces of the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26, which constitute the lead 20, can be exposed to the inside of the frame portion 32 when viewed from above. The upper surfaces of the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26 are, for example, coplane with the upper surface of the bottom portion 31. The lower surfaces of the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26 can be exposed from the lower surface of the bottom portion 31 of the resin molded body 30. The lower surfaces of the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26 are, for example, coplane with the lower surface of the bottom portion 31. When the lower surfaces of the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26 are exposed from the lower surface of the bottom 31 of the resin molded body 30, heat from the light-emitting device 1 is more easily transferred to the substrate on which the light-emitting device 1 is mounted via each lead. This improves the heat dissipation of the light-emitting device 1. In addition, the lower surfaces of each lead exposed from the lower surface of the bottom 31 can be used as external terminals for electrical connection to the substrate. The light-emitting device 1 may include seven or more leads. The light-emitting device 1 may also include leads that are not electrically connected to the light-emitting element.

[0032] Examples of materials for the lead 20 include copper, aluminum, gold, silver, iron, nickel, or alloys thereof, phosphor bronze, iron-containing copper, and other metals. It is particularly preferable to use copper, which has high heat dissipation properties, as the material for the lead 20. The lead 20 can be formed into a predetermined shape by processes such as rolling, punching, extrusion, etching by wet or dry etching, or a combination thereof. The lead 20 may be a single layer or a laminated structure (e.g., clad material).

[0033] The lead 20 may have a plating layer on the surface of the base metal. The plating layer may, for example, use gold, silver, copper, platinum, aluminum, or an alloy containing one of these, for the purpose of improving reflectivity. Since gold is less susceptible to corrosion than silver, etc., if the plating layer contains gold, the reliability of the light-emitting device 1 can be improved. If the plating layer contains silver, it is preferable to provide a known protective film such as silicon oxide on the surface of the plating layer. This reduces discoloration of the silver-containing plating layer due to sulfur components in the atmosphere. The protective film may be a single layer or a multilayer film. The protective film can be formed by at least one of sputtering, vapor deposition, or atomic layer deposition (ALD) method. Among these, sputtering is preferred because it is simple, and atomic layer deposition is preferred because it is easy to form a dense film with low water vapor permeability.

[0034] In the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26, grooves may or may not be provided on the side closer to the frame portion 32 when viewed from above. It is preferable to provide grooves in the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26 on the side closer to the frame portion 32 when viewed from above. The grooves are recessed downwards from the top surface of the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26. The grooves can be formed by etching or pressing. At least one of the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26 may have a groove. It is preferable to place a part of the resin molded body 30 inside the groove. This improves the adhesion between the resin molded body 30 and the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and / or sixth lead 26.

[0035] (Resin molded body 30) In the resin molded body 30, the inner surface of the frame portion 32 may be an inclined surface that slopes with respect to the upper surface of the lead 20, or a vertical surface that is perpendicular to the upper surface of the lead 20. In the example of the light-emitting device 1, the inner surface of the frame portion 32 has an inclined surface that slopes outward as it goes upward from the upper surface of the lead 20. This makes it easier for light from the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 to be reflected upward.

[0036] The wall portion 33 is a member that separates the first recess 101 and the second recess 102. The wall portion 33 is located above the upper surface of the lead 20. In the example of the light-emitting device 1, the wall portion 33 extends in the second direction Y and is provided continuously until it contacts the inner surface of the frame portion 32. The wall portion 33 does not have to contact the inner surface of the frame portion 32.

[0037] The wall portion 33 may or may not cover the upper surface of the first lead 21, the upper surface of the second lead 22, and / or the upper surface of the third lead 23. Covering the upper surface of the first lead 21, the upper surface of the second lead 22, and / or the upper surface of the third lead 23 with the wall portion 33 makes it easier to improve the adhesion between the support 10 and the first lead 21, the second lead 22, and / or the third lead 23. If the wall portion 33 does not cover the upper surface of the first lead 21, the upper surface of the second lead 22, and / or the upper surface of the third lead 23, the area of ​​the leads 20 exposed from the resin molded body 30 at the first bottom surface 101a and the second bottom surface 102a can be increased. This makes it easier to arrange the first light-emitting element 41, the second light-emitting element 42, and / or the third light-emitting element 43 on the leads 20.

[0038] The presence of the wall portion 33 in the light-emitting device 1 makes it difficult for the first translucent member 71 and the second translucent member 72 to come into contact. Furthermore, the presence of the wall portion 33 in the light-emitting device 1 makes it difficult for light from the first light-emitting element 41 and the second light-emitting element 42 to hit the second translucent member 72, and also makes it difficult for light from the third light-emitting element 43 to hit the first translucent member 71. In this way, it becomes easier to increase the difference between the chromaticity when only the first light-emitting element 41 is emitting light, when only the second light-emitting element 42 is emitting light, and when only the third light-emitting element 43 is emitting light. This makes it easier to widen the color gamut of the light-emitting device 1.

[0039] In this embodiment, the shape of the wall portion 33 is trapezoidal in cross-section. The corners of the trapezoid may be chamfered or rounded. However, the shape of the wall portion 33 is not particularly limited, and in cross-section it may be rectangular, triangular, approximately semicircular, approximately semielliptical, curved at the top, or inclined at the top, or it may have a stepped shape, for example.

[0040] The resin molded body 30 can use known materials such as thermosetting resins and thermoplastic resins as the base resin material. In the case of thermoplastic resins, for example, polyphthalamide resin, polybutylene terephthalate (PBT), unsaturated polyester, etc. can be used. In the case of thermosetting resins, for example, epoxy resin, modified epoxy resin, silicone resin, modified silicone resin, etc. can be used. In particular, it is preferable to use a thermosetting resin such as epoxy resin or silicone resin that has excellent heat resistance and light resistance as the resin material.

[0041] The resin molded body 30 preferably contains light-scattering particles in the resin material that serves as the base material. It is preferable to use light-scattering particles that do not easily absorb light from the light-emitting element and have a large refractive index difference with respect to the resin material. Examples of such light-scattering particles include titanium oxide, zinc oxide, silicon oxide, zirconium oxide, aluminum oxide, and aluminum nitride.

[0042] The resin molded body 30 may use a dark-colored resin such as a black resin or a gray resin. By using a dark-colored resin for the resin molded body 30, the decrease in light extraction efficiency can be reduced even if the resin molded body 30 discolors. Examples of dark-colored resins include resins containing fillers such as acetylene black, activated carbon, carbon such as graphite, transition metal oxides such as iron oxide, manganese dioxide, cobalt oxide, molybdenum oxide, or colored organic pigments. The density of the color, such as black or gray, can be adjusted by the amount of filler added. Examples of resins include the resin material that serves as the base material for the resin molded body 30 as described above. The resin molded body 30 may be formed from two types of resins: a dark-colored resin and a white resin containing light-scattering particles.

[0043] In the resin molded body 30, reflective members may be provided on the bottom surface and inner surface defining the first recess 101 and the second recess 102. This makes it possible to efficiently extract the light emitted by the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43, as well as the wavelength-converted light, upward, thereby improving the light extraction efficiency of the light-emitting device 1. As the reflective member, it is preferable to use a material that does not easily transmit and / or absorb light from the light-emitting elements and / or ambient light. The reflective member is preferably white. As the base resin material for the reflective member, the same resin material used in the resin molded body 30 can be used. The reflective member contains light-scattering particles in these base resin materials. As the light-scattering particles, it is preferable to use a material that does not easily absorb light from the light-emitting elements and has a large refractive index difference with respect to the base resin material. Examples of such light-scattering particles include the same light-scattering particles contained in the resin molded body 30.

[0044] Furthermore, when a reflective member is provided, it is preferable to provide grooves on the upper surface of the lead 20 that surround the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 when viewed from above. This allows each groove to act as a barrier for the reflective member, reducing the decrease in luminous efficiency caused by the reflective member coming into contact with the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43.

[0045] (First light-emitting element, second light-emitting element, and third light-emitting element) The first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 are semiconductor elements that emit light on their own when a voltage is applied. The shape and size of the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 can be selected arbitrarily. Examples of the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 include an n-type semiconductor layer, a p-type semiconductor layer, and a light-emitting layer sandwiched between them. The light-emitting layer may have a structure such as a double heterojunction or a single quantum well (SQW), or it may have a structure having a group of light-emitting layers such as a multiple quantum well (MQW). The light-emitting layer can be configured to emit visible light or ultraviolet light, for example.

[0046] The semiconductor structure may include multiple light-emitting sections, each containing an n-side semiconductor layer, an active layer, and a p-side semiconductor layer. When the semiconductor structure includes multiple light-emitting sections, each light-emitting section may include well layers with different emission peak wavelengths, or well layers with the same emission peak wavelength. Note that "same emission peak wavelength" includes variations of a few nanometers. The combination of emission peak wavelengths of the multiple light-emitting sections can be selected as appropriate. For example, when the semiconductor structure includes two light-emitting sections, possible combinations of light emitted by each section include blue light and blue light, green light and green light, red light and red light, ultraviolet light and ultraviolet light, blue light and green light, blue light and red light, or green light and red light. For example, when the semiconductor structure includes three light-emitting sections, possible combinations of light emitted by each section include blue light, green light, and red light. Each light-emitting section may include one or more well layers with different emission peak wavelengths from the other well layers. The semiconductor structure may also be an epitaxial stack structure.

[0047] The first light-emitting element 41 can be, for example, a light-emitting element with a green emission color. The second light-emitting element 42 and the third light-emitting element 43 can be, for example, light-emitting elements with a blue emission color. However, the emission colors of the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 can be selected from any wavelength depending on the application. For example, as blue and green light-emitting elements, nitride semiconductors (In x Al y Ga 1-x-y Devices using N(0≦x, 0≦y, x+y≦1), GaP, etc., can be used. In addition to nitride-based semiconductor devices, GaAlAs, AlInGaP, etc. can also be used as red light-emitting elements.

[0048] The first light-emitting element 41 is face-up mounted on the first lead 21. In the example of the light-emitting device 1, one element electrode of the first light-emitting element 41 is connected to the second lead 22 via a wire 60, and the other element electrode is connected to the third lead 23 via a wire 60. The second light-emitting element 42 has a pair of element electrodes on its upper surface and is face-up mounted on the first lead 21. One element electrode of the second light-emitting element 42 is connected to the fourth lead 24 via a wire 60, and the other element electrode is connected to the fifth lead 25 via a wire 60. The third light-emitting element 43 has a pair of element electrodes on its upper surface and is face-up mounted on the first lead 21. One element electrode of the third light-emitting element 43 is connected to the first lead 21 via a wire 60, and the other element electrode is connected to the sixth lead 26 via a wire 60. Each light-emitting element may be mounted as a flip-chip, with the side where the electrodes are formed facing downwards.

[0049] In the example of the light-emitting device 1, the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 are mounted on the lead 20, but it may also be a COB (Chip On Board) type light-emitting device in which the light-emitting elements are directly arranged on a substrate having electrode terminals. In a COB type light-emitting device, a frame portion that covers the light-emitting elements when viewed from above is provided on the upper surface of the substrate, and a light-transmitting member can be arranged inside the frame portion. The light-emitting device 1 of this embodiment has three light-emitting elements, the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43, but the light-emitting device 1 may have four or more light-emitting elements.

[0050] (Protective element) The light-emitting device 1 may include a protective element. The protective element is, for example, a Zener diode. The protective element can be mounted at any location on the lead 20. The protective element has, for example, an element electrode on its upper surface. The element electrode can be connected at any location on the lead 20 via, for example, a wire 60. A varistor may be used as the protective element.

[0051] (1st translucent member) The first light-transmitting member 71 may cover a portion of the inner surface of the frame portion 32 on the -X side of the wall portion 33, or it may cover the entire surface. When the entire surface is covered, the light emitted by the first wavelength conversion member included in the first light-transmitting member 71 can be intensified. The upper surface of the first light-transmitting member 71 may be flat, concave with the central part lower than the peripheral part, or convex with the central part higher than the peripheral part.

[0052] The first light-transmitting member 71 contains particulate first wavelength conversion members in a base material made of, for example, a light-transmitting resin. The same resin material used in the resin molded body 30 can be used as the base material. In particular, it is preferable to use a silicone resin composition and / or an epoxy resin composition. The first light-transmitting member 71 may also contain light-scattering particles similar to those in the resin molded body 30.

[0053] As the material of the base material of the first light-transmissive member 71, in addition to resin materials, there are ceramics, glass, sintered bodies of phosphors, and the like. Thereby, the reliability of the light-emitting device can be improved in a high-output light-emitting device.

[0054] In the first light-transmissive member 71, the content of the first wavelength conversion member can be, for example, 30% by mass or more and 70% by mass or less with respect to the total mass of the first light-transmissive member 71. The first light-transmissive member 71 may include one or more other wavelength conversion members together with the first wavelength conversion member. In this case, in a cross-sectional view, the area of each of the other wavelength conversion members in the first light-transmissive member 71 is smaller than the area of the first wavelength conversion member. By including other wavelength conversion members together with the first wavelength conversion member in the first light-transmissive member 71, the color rendering property of the light-emitting device 1 can be improved. Examples of the first wavelength conversion member include phosphors. Examples of the other wavelength conversion members include phosphors of a different type from the first wavelength conversion member. The phosphor is excited by the light emitted by the light-emitting element and emits light having a wavelength different from the wavelength of the light emitted by the light-emitting element. Examples of the phosphor include yttrium aluminum garnet-based phosphors (for example, (Y,Gd)3(Al,Ga)5O 12 :Ce), lutetium aluminum garnet-based phosphors (for example, Lu3(Al,Ga)5O 12 :Ce), terbium aluminum garnet-based phosphors (for example, Tb3(Al,Ga)5O 12 :Ce), CCA-based phosphors (for example, Ca 10 (PO4)6Cl2:Eu), BAM-based phosphors (for example, BaMgAl 10 O 17 :Eu 2+ ), SAE-based phosphors (for example, Sr4Al 14 O 25 :Eu), chlorosilicate-based phosphors (for example, Ca8MgSi4O 16 Cl2:Eu), silicate-based phosphors (for example, (Ba,Sr,Ca,Mg)2SiO4:Eu), β-sialon-based phosphors (for example, (Si,Al)3(O,N)4:Eu) or α-sialon-based phosphors (for example, Ca(Si,Al) 12 (O,N)16 : Oxynitride phosphors such as Eu), LSN phosphors (e.g., (La,Y)3Si6N 11 : Ce), BSESN phosphors (e.g., (Ba,Sr)2Si5N8:Eu), SLA phosphors (e.g., SrLiAl3N4:Eu), CASN phosphors (e.g., CaAlSiN3:Eu) or SCASN phosphors (e.g., (Sr,Ca)AlSiN3:Eu), nitride phosphors such as KSF phosphors (e.g., K2SiF6:Mn), KSAF phosphors (e.g., K2(Si 1-x Al x )F 6-x : Mn where x satisfies 0 < x < 1.), or fluoride phosphors such as MGF phosphors (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I)3 where FA and MA represent formamidinium and methylammonium, respectively.), II-VI group quantum dots (e.g., CdSe), III-V group quantum dots (e.g., InP), or quantum dots having a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se)2) and the like can be mentioned.

[0055] As the first wavelength conversion member, for example, a red phosphor having a wide half-value width can be used. Thereby, the color rendering property of the light-emitting device 1 can be improved. The half-value width of the red phosphor is, for example, 60 nm or more and 100 nm or less, and preferably 70 nm or more and 85 nm or less. Generally, compared with the emission spectrum of the red light-emitting element, the half-value width of the emission spectrum of the light-emitting device using the red phosphor tends to be wider. Therefore, compared with the case of extracting red light by the red light-emitting element, by using a red phosphor as the first wavelength conversion member, it becomes easier to improve the color rendering property of the light-emitting device 1.

[0056] Examples of red phosphors include KSF, SCASN, and CASN. The composition of KSF is, for example, K2SiF6:Mn. The composition of SCASN is, for example, (Sr,Ca)AlSiN3:Eu. The composition of CASN is, for example, CaAlSiN3:Eu. When the first light-emitting element 41 emits green light and the second light-emitting element 42 emits blue light, it is preferable to use KSF as the first wavelength conversion member. KSF is less easily excited by green light compared to SCASN and CASN. Therefore, by using KSF as the first wavelength conversion member, it becomes easier to increase the difference between the chromaticity when only the first light-emitting element 41 is emitting light and the chromaticity when only the second light-emitting element 42 is emitting light. This makes it easier to broaden the color gamut of the light-emitting device.

[0057] (Second translucent member) The second light-transmitting member 72 may cover a portion of the inner surface of the frame portion 32 on the +X side of the wall portion 33, or it may cover the entire surface. The upper surface of the second light-transmitting member 72 may be flat, or it may be concave, with the central part being lower than the peripheral part.

[0058] The second translucent member 72 is made of, for example, a translucent resin. The second translucent member 72 can use the same resin material as the first translucent member 71 as the base resin material. The second translucent member 72 may contain light scattering particles. The same light scattering particles that can be contained in the first translucent member 71 can be used as the light scattering particles.

[0059] [Manufacturing method for light-emitting devices] An example of a manufacturing method for the light-emitting device 1 will be described.

[0060] (Lead preparation process) The lead preparation process involves preparing a lead 20 having a first lead 21, a second lead 22, a third lead 23, a fourth lead 24, a fifth lead 25, and a sixth lead 26. The lead 20 can be formed by etching or pressing a thin metal plate. If necessary, a plating layer may be formed on the surface of the lead 20 by electroless plating or electrolytic plating.

[0061] (Resin molded body forming process) The resin molded body forming process is a process of forming a resin molded body 30 that fixes and holds the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26. In this process, for example, the leads 20 having the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26 are placed in a mold for package manufacturing, and resin is injected into the mold and the resin is cured. This results in a support body 10 including the leads 20 and the resin molded body 30.

[0062] (Light-emitting element placement process) The light-emitting element mounting step is the step of mounting the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 on the first lead 21. In this step, for example, the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 are mounted face up on the first lead 21 that is exposed on the bottom surface of the first recess 101 or the second recess 102, with the electrode-forming surface being the main light extraction surface and the surface opposite to the electrode-forming surface being the mounting surface.

[0063] (Wire connection process) The wire connection step is the step of forming wires 60 that electrically connect the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 to any point on the lead 20. After forming the wires 60, the aforementioned protective film may be formed to cover the lead, the light-emitting elements, and the wires. The wire connection step is not necessary if the first light-emitting element 41, the second light-emitting element 42, and / or the third light-emitting element 43 are face-down mounted.

[0064] (First translucent member arrangement step) The first translucent member placement step is a step of placing the first translucent member 71 so as to cover the top and side surfaces of the first light-emitting element 41 and the second light-emitting element 42. In this step, for example, a resin that will become the first translucent member 71 is placed so as to cover the top and side surfaces of the first light-emitting element 41 and the second light-emitting element 42 by printing, potting, spraying, etc. Then, for example, the resin is cured at a temperature of 120°C to 200°C to form the first translucent member 71. The first translucent member 71 may be placed by attaching a sheet-shaped or block-shaped resin member to the top surface of the light-emitting element with an adhesive or the like.

[0065] (Second translucent member placement process) The second translucent member placement step is the step of placing the second translucent member 72 so as to cover the top and side surfaces of the third light-emitting element 43. In this step, the second translucent member 72 can be placed by placing resin in a predetermined position and heating it to harden the resin, similar to the first translucent member 71. The second translucent member 72 may also be placed by attaching a sheet-shaped or block-shaped resin member to the top surface of the light-emitting element with an adhesive or the like.

[0066] Note that the first translucent member 71 and the second translucent member 72 may be placed first, or they may be placed simultaneously. Also, the support body 10 created by the resin molded body forming process may be an assembly in which the support bodies 10 constituting each of the multiple light-emitting devices are connected. When the support body 10 is an assembly, the first lead 21, second lead 22, third lead 23, fourth lead 24, fifth lead 25, and sixth lead 26 constituting each of the multiple light-emitting devices are connected. Also, when the support body 10 is an assembly, the resin molded bodies 30 constituting each of the multiple light-emitting devices are connected. When the support body 10 is an assembly, the manufacturing method of the light-emitting device 1 includes a fragmentation step to separate each light-emitting device into individual pieces.

[0067] Furthermore, in the manufacturing method of the light-emitting device 1, other steps may be included between or before / after each of the above steps, as long as they do not contradict the above steps. For example, a foreign matter removal step may be included to remove foreign matter that has been mixed in during the manufacturing process.

[0068] Furthermore, in the manufacturing method of the light-emitting device 1, some steps are not limited to a specific order and may be performed in any order.

[0069] The lead preparation process and / or resin molded body formation process may be carried out in-house, or the lead with grooves already formed may be prepared by acquisition, including purchase.

[0070] (Variation 1) Figure 3 is a schematic cross-sectional view illustrating a light-emitting device according to Modification 1 of the First Embodiment. The light-emitting device 1A shown in Figure 3 differs from the light-emitting device 1 in that the second light-transmitting member 72 is replaced with the second light-transmitting member 72A.

[0071] Furthermore, unlike the light-emitting device 1, in the light-emitting device 1A, the height of the wall portion 33 is lower than the height of the frame portion 32, with respect to the upper surface of the lead 20. However, it is preferable that the height of the wall portion 33 is higher than the height of the upper surfaces of the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43, with respect to the upper surface of the lead 20. This makes it easier for the first light-transmitting member 71 to cover the upper surfaces of the first light-emitting element 41 and the second light-emitting element 42.

[0072] The second light-transmitting member 72A covers the upper surface of the first light-emitting element 41, the upper surface of the second light-emitting element 42, the upper surface of the third light-emitting element 43, and the upper surface of the wall portion 33. In the illustrated example, the second light-transmitting member 72A has a first light-transmitting portion 721 that overlaps with the first light-emitting element 41, the second light-emitting element 42, the third light-emitting element 43, and the wall portion 33 when viewed from above, and a second light-transmitting portion 722 that overlaps with the third light-emitting element 43 when viewed from above. The second light-transmitting portion 722 is located within the second recess 102. The first light-transmitting portion 721 is located above the first light-transmitting member 71 located within the first recess 101, and above the second light-transmitting portion 722 located within the second recess 102.

[0073] The dashed line A is a virtual line indicating the height boundary between the first translucent portion 721 and the second translucent portion 722. The dashed line A may be coplane with the upper surface of the wall portion 33. The second translucent portion 722 is located on the lead 20 side of the second recess 102 than the dashed line A. The first translucent portion 721 and the second translucent portion 722 may be a single unit or separate.

[0074] Thus, in the light-emitting device 1A, the second light-transmitting member 72A has a first light-transmitting portion 721 that overlaps with the first light-emitting element 41, the second light-emitting element 42, the third light-emitting element 43, and the wall portion 33 when viewed from above. As a result, the light emitted by the first light-emitting element 41 and the second light-emitting element 42 and the light emitted by the third light-emitting element 43 mix more easily above the wall portion 33, thereby improving the color mixing above the wall portion 33.

[0075] The first light-emitting element 41 and the third light-emitting element 43 are positioned side by side in the first direction X, and it is preferable that the length of the third light-emitting element 43 in the first direction X is shorter than the length of the third light-emitting element 43 in the second direction Y which is perpendicular to the first direction X. In other words, it is preferable that the third light-emitting element 43 is positioned with its longitudinal direction facing the second direction Y.

[0076] Suppose the length of the third light-emitting element 43 in the first direction X is longer than the length of the third light-emitting element 43 in the second direction Y, which is perpendicular to the first direction X. In this case, in Figure 3, the light from the +X end of the third light-emitting element 43 toward the upper part of the wall 33 is incident at a relatively large angle of incidence on the upper surface of the first light-transmitting part 721 located above the wall 33, and may be totally reflected at the upper surface of the first light-transmitting part 721. If some of the light emitted by the third light-emitting element 43 is totally reflected at the upper surface of the first light-transmitting part 721, the light extraction efficiency of the light-emitting device will be reduced. In addition, if the light totally reflected at the upper surface of the first light-transmitting part 721 is incident on the first light-transmitting member 71, the first wavelength conversion member may be excited. This may cause the light emitted by the light-emitting device to deviate from the desired chromaticity.

[0077] In the light-emitting device 1A, by making the length of the third light-emitting element 43 in the first direction X shorter than the length of the third light-emitting element 43 in the second direction Y which is perpendicular to the first direction X, the amount of light emitted by the third light-emitting element 43 that is totally reflected at the upper surface of the first light-transmitting section 721 can be reduced. This improves the light extraction efficiency of the light-emitting device 1A. In addition, since the first wavelength conversion member is less likely to be excited by the light emitted by the third light-emitting element 43, the deviation of the emitted light from the desired chromaticity of the light-emitting device 1A can be reduced.

[0078] (Modification 2) Figure 4 is a schematic cross-sectional view illustrating a light-emitting device according to a modified example 2 of the first embodiment. The light-emitting device 1B shown in Figure 4 differs from the light-emitting device 1A in that it has a third light-transmitting member 73.

[0079] The third light-transmitting member 73 is located within the first recess 101, between the first light-transmitting member 71 and the first light-transmitting portion 721. The third light-transmitting member 73 includes a second wavelength conversion member having an emission peak wavelength shorter than the emission peak wavelength of the first light-emitting element 41.

[0080] The third light-transmitting member 73 contains, for example, a particulate second wavelength conversion member in a base material made of a light-transmitting resin. The third light-transmitting member 73 can use the same resin material as the base material used in the first light-transmitting member 71. The third light-transmitting member 73 may also contain light-scattering particles. The same light-scattering particles that can be contained in the first light-transmitting member 71 can be used.

[0081] For example, in the light-emitting device 1A shown in Figure 3, even if the amount of light emitted by the third light-emitting element 43 that is totally reflected at the upper surface of the first light-transmitting section 721 is reduced, some light may still be totally reflected. In this case, as mentioned above, a decrease in the light extraction efficiency of the light-emitting device and / or a deviation of the emitted light from the desired chromaticity may occur.

[0082] In the light-emitting device 1B, the third light-transmitting member 73 is positioned between the first light-transmitting member 71 and the first light-transmitting section 721. Therefore, even if light from the third light-emitting element 43 is reflected from the upper surface of the first light-transmitting section 721, the amount of light hitting the first light-transmitting member 71 can be reduced. As a result, the first wavelength conversion member is less likely to be excited, and the deviation of the emitted light from the light-emitting device 1B from the desired chromaticity can be reduced.

[0083] For example, if the first light-emitting element 41 emits green light and the third light-emitting element 43 emits blue light, a blue phosphor can be used as the second wavelength conversion member contained in the third light-transmitting member 73. Examples of blue phosphors include CCA and BAM. The composition of CCA is, for example, Ca 10 The composition of BAM is (PO4)6Cl2:Eu. For example, BaMgAl 10 O 17 :EU 2+ That is the case.

[0084] The third light-transmitting member 73 may contain a blue pigment. If the third light-transmitting member 73 contains a blue pigment, the third light-transmitting member 73 may or may not contain a second wavelength conversion member.

[0085] (Variation 3) Figure 5 is a schematic top view illustrating a light-emitting device according to modification 3 of the first embodiment. The light-emitting device 1C shown in Figure 5 differs from the light-emitting device 1 in the arrangement of the first light-emitting element 41 and the second light-emitting element 42.

[0086] In the light-emitting device 1C, the first light-emitting element 41 and the second light-emitting element 42 are positioned side by side in the second direction Y. The first light-emitting element 41 and the second light-emitting element 42 are rectangular in top view, with their respective long sides parallel to the first direction X and their respective short sides parallel to the second direction Y. In top view, a virtual line connecting the center of the first light-emitting element 41 and the center of the second light-emitting element 42 may be parallel to the second direction Y. Furthermore, the long sides of the first light-emitting element 41 and the second light-emitting element 42 face each other. By arranging the first light-emitting element 41 and the second light-emitting element 42 in this manner, the light-emitting device 1C can be miniaturized in the first direction X. In addition, the opposing long sides of the first light-emitting element 41 and the second light-emitting element 42 improve color mixing.

[0087] The inner surface of the frame portion 32 defining the first recess 101, the first light-emitting element 41, the wall portion 33, and the third light-emitting element 43 are arranged in order in the first direction X, and it is preferable that, in a top view, the length L1 from the first light-emitting element 41 to the wall portion 33 in the first direction X is shorter than the length L2 from the first light-emitting element 41 to the inner surface of the frame portion 32 defining the first recess 101 in the first direction X. This makes it possible to bring the first light-emitting element 41 and the third light-emitting element 43 closer together, thereby improving color mixing.

[0088] Similarly, the inner surface of the frame portion 32 defining the first recess 101, the second light-emitting element 42, the wall portion 33, and the third light-emitting element 43 are arranged in order in the first direction X, and it is preferable that, in a top view, the length L3 from the second light-emitting element 42 to the wall portion 33 is shorter than the length L4 from the second light-emitting element 42 to the inner surface of the frame portion 32 defining the first recess 101 in the first direction X. This makes it possible to bring the second light-emitting element 42 and the third light-emitting element 43 closer together, thereby improving color mixing.

[0089] (Modification 4) Figure 6 is a schematic cross-sectional view (1) illustrating a light-emitting device according to modification 4 of the first embodiment. The light-emitting device 1D shown in Figure 6 differs from the light-emitting device 1 in that it includes a first light-diffusing member 81.

[0090] The first light-diffusing member 81 overlaps with the first light-emitting element 41 in a top view, and at least a portion of it is located above the wall portion 33. The entire first light-diffusing member 81 may also be located above the wall portion 33. The first light-diffusing member 81 covers the upper surface of the first light-transmitting member 71. The first light-diffusing member 81 can have various shapes, but for example, it can have a convex shape in which the central part is higher than the peripheral part.

[0091] The first light-diffusing member 81 has light-transmitting and light-diffusing properties, and for example, contains light-scattering particles in a base material made of a light-transmitting resin. The first light-diffusing member 81 can use the same resin material as the base material used in the first light-transmitting member 71. The light-scattering particles can be the same as the light-scattering particles that can be contained in the first light-transmitting member 71.

[0092] By providing the first light diffusing member 81, the light incident on the first light diffusing member 81 is diffused and emitted from the first light diffusing member 81, making it easier to mix with the light emitted from the second light-transmitting member 72, thereby improving color mixing.

[0093] Figure 7 is a schematic cross-sectional view (2) illustrating a light-emitting device according to modification 4 of the first embodiment. The light-emitting device 1E shown in Figure 7 differs from the light-emitting device 1D in that it includes a second light-diffusing member 82 in addition to the first light-diffusing member 81.

[0094] The second light-diffusing member 82 overlaps with the third light-emitting element 43 in a top view, and at least a portion of it is located above the wall portion 33 and away from the first light-diffusing member 81. The second light-diffusing member 82 may be entirely located above the wall portion 33. The second light-diffusing member 82 covers the upper surface of the second light-transmitting member 72. The second light-diffusing member 82 can have various shapes, but for example, it can have a convex shape in which the central part is higher than the peripheral part.

[0095] The second light-diffusing member 82 has light-transmitting and light-diffusing properties, and for example, contains light-scattering particles in a base material made of a light-transmitting resin. The second light-diffusing member 82 can use the same resin material as the base material used in the first light-transmitting member 71. The light-scattering particles can be the same as the light-scattering particles that can be contained in the first light-transmitting member 71.

[0096] By providing the second light diffusing member 82, the light incident on the second light diffusing member 82 is diffused and emitted from the second light diffusing member 82, making it easier to mix with the light diffused and emitted from the first light diffusing member 81, thereby further improving the color mixing ability compared to the light-emitting device 1D.

[0097] Furthermore, by positioning the second light-diffusing member 82 at a distance from the first light-diffusing member 81, it becomes easier to reduce the amount of light from the third light-emitting element 43 that passes through the first light-diffusing member 81 and the second light-diffusing member 82 before hitting the first light-transmitting member 71. As a result, the first wavelength conversion member is less likely to be excited, thus reducing the deviation of the emitted light from the light-emitting device 1E from the desired chromaticity.

[0098] In the light-emitting devices 1D and 1E, the height of the wall portion 33 is the same as the height of the frame portion 32, with respect to the top surface of the lead 20. However, as shown in Figure 3, the height of the wall portion 33 may be lower than the height of the frame portion 32. In this case, the light emitted by the first light-emitting element 41 and the second light-emitting element 42 and the light emitted by the third light-emitting element 43 mix more easily above the wall portion 33, further improving the color mixing ability.

[0099] (Variation 5) Figure 8 is a schematic cross-sectional view illustrating a light-emitting device according to modification 5 of the first embodiment. The light-emitting device 1F shown in Figure 8 differs from the light-emitting device 1A in that the third light-emitting element 43 is inclined with respect to the upper surface of the lead 20. In the light-emitting device 1A shown in Figure 3, the third light-emitting element 43 is not inclined with respect to the upper surface of the lead 20.

[0100] In the light-emitting device 1F, the third light-emitting element 43 can be positioned at an angle to the upper surface of the lead 20 such that the -X side of its upper surface is higher than the +X side. This makes it easier to reduce the amount of light from the third light-emitting element 43 that is reflected from the upper surface of the second translucent member 72A and strikes the first translucent member 71. As a result, the first wavelength conversion member is less likely to be excited, and the deviation of the emitted light from the light-emitting device 1F from the desired chromaticity can be reduced.

[0101] Alternatively, the third light-emitting element 43 may be positioned at an angle to the upper surface of the lead 20 such that the -X side of its upper surface is lower than the +X side. This further improves the color mixing properties of the light-emitting device. To tilt the third light-emitting element 43 with respect to the upper surface of the lead 20, for example, the amount of adhesive on the -X side and the amount of adhesive on the +X side can be varied when bonding the third light-emitting element 43 to the upper surface of the lead 20.

[0102] (Experimental variation 6) Figure 9 is a schematic cross-sectional view illustrating a light-emitting device according to modification 6 of the first embodiment. The light-emitting device 1G shown in Figure 9 differs from the light-emitting device 1A in that it has a first light control unit 91, a second light control unit 92, and a fourth light-transmitting member 95.

[0103] The first light control unit 91 covers the upper surface of the third light-emitting element 43. The second light control unit 92 covers the upper surface of the second light-transmitting member 72A on the second recess 102 and on the wall portion 33. The second light control unit 92 does not cover the upper surface of the second light-transmitting member 72A on the first recess 101. The first light control unit 91 and the second light control unit 92 can have various shapes, but for example, they can have a convex lens shape in which the central part is higher than the peripheral part. The second light control unit 92 and the second light-transmitting member 72A may be an integrated unit or separate units.

[0104] The first light control unit 91 and the second light control unit 92 are translucent and are made of, for example, a translucent resin. The first light control unit 91 and the second light control unit 92 can use the same resin material as the first translucent member 71 as the base resin material. The first light control unit 91 and the second light control unit 92 may contain light scattering particles. The same light scattering particles that can be contained in the first translucent member 71 can be used as the light scattering particles.

[0105] As described above, by providing the first light control unit 91 and the second light control unit 92, light distribution control becomes possible. The side surface of the third light-emitting element 43 may be covered with a reflective member. This brings the third light-emitting element 43 closer to a point light source, making light distribution control by the first light control unit 91 easier. Only one of the first light control unit 91 or the second light control unit 92 may be provided.

[0106] Furthermore, because the convex lens-shaped first light control unit 91 is positioned on the upper surface of the third light-emitting element 43, the light emitted by the third light-emitting element 43 is focused by the first light control unit 91. This reduces the amount of light emitted from the first light control unit 91 that is reflected from the upper surface of the second light-transmitting member 72A and strikes the first light-transmitting member 71. As a result, the first wavelength conversion member is less likely to be excited, and the deviation of the emitted light from the light-emitting device 1G from the desired chromaticity can be reduced.

[0107] Furthermore, by not providing a convex-shaped light control unit on the upper surface of the first light-emitting element 41, the light emitted by the first light-emitting element 41 is more easily incident on the third light-emitting element 43 side, thereby improving color mixing.

[0108] The fourth light-transmitting member 95 covers the upper surface of the second light-emitting element 42. The fourth light-transmitting member 95 can have various shapes; for example, it can have a convex shape in which the central part is higher than the peripheral part.

[0109] The fourth translucent member 95 is translucent and contains particulate third-wavelength conversion members in a base material made of, for example, a translucent resin. The fourth translucent member 95 can use the same resin material as the base material used in the first translucent member 71. The fourth translucent member 95 may contain light-scattering particles. The same light-scattering particles that can be contained in the first translucent member 71 can be used as light-scattering particles.

[0110] The third wavelength conversion member has an emission peak wavelength longer than the emission peak wavelength of the second light-emitting element 42. For example, if the second light-emitting element 42 emits blue light, the third wavelength conversion member can be a red phosphor. This makes it possible to increase the redness of the light emitted from the light-emitting device 1G, thereby improving color rendering.

[0111] (Example 7) Figure 10 is a schematic cross-sectional view illustrating a light-emitting device according to modification 7 of the first embodiment. In cross-sectional view, the shape of the wall portion 33 of the light-emitting device 1H shown in Figure 10 differs from that of the light-emitting device 1.

[0112] In the light-emitting device 1H, in a cross-sectional view, the inclination angles of the +X-side inclined surface and the -X-side inclined surface of the wall portion 33 are different. In a cross-sectional view, the angle θ1 between the upper surface of the lead 20 and the +X-side inclined surface of the wall portion 33 is smaller than the angle θ2 between the upper surface of the lead 20 and the -X-side inclined surface of the wall portion 33. As a result, the light emitted by the third light-emitting element 43 is reflected by the +X-side inclined surface of the wall portion 33 and tends to concentrate towards the center of the frame portion 32 in a top view, thus improving color mixing. However, in a cross-sectional view, the angle θ1 between the upper surface of the lead 20 and the +X-side inclined surface of the wall portion 33 may be larger than the angle θ2 between the upper surface of the lead 20 and the -X-side inclined surface of the wall portion 33.

[0113] Preferred embodiments have been described in detail above. However, the embodiments are not limited to those described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0114] In addition to the embodiments described above, the following further notes are disclosed. (Note 1) A support having a first recess and a second recess separated by a wall, wherein, in a top view, the area of ​​the first bottom surface defining the first recess is larger than the area of ​​the second bottom surface defining the second recess, A first light-emitting element and a second light-emitting element located within the first recess, A third light-emitting element located within the second recess, A first translucent member is located within the first recess and includes a first wavelength conversion member having an emission peak wavelength longer than the emission peak wavelength of the first light-emitting element, and is positioned so as to overlap the first light-emitting element and the second light-emitting element in a top view, and away from the third light-emitting element in a top view, It has a second translucent member located within the second recess and overlapping with the third light-emitting element in a top view, The first light-emitting element, the second light-emitting element, and the third light-emitting element are independently drivable. A light-emitting device in which the emission peak wavelength of the first light-emitting element is longer than the emission peak wavelength of the second light-emitting element and the emission peak wavelength of the third light-emitting element. (Note 2) The light-emitting device according to Appendix 1, wherein the second light-transmitting member has, in a top view, the first light-emitting element, the second light-emitting element, the third light-emitting element, and a first light-transmitting portion that overlaps with the wall portion. (Note 3) The light-emitting device according to Appendix 2, further comprising a third light-emitting member that includes a second wavelength conversion member located between the first light-transmitting member and the first light-transmitting portion, and having an emission peak wavelength shorter than the emission peak wavelength of the first light-emitting element. (Note 4) The first light-emitting element and the third light-emitting element are positioned side by side in the first direction. The light-emitting device according to any one of appendices 1 to 3, wherein the length of the third light-emitting element in the first direction is shorter than the length of the third light-emitting element in the second direction perpendicular to the first direction. (Note 5) The light-emitting device according to any one of appendices 1 to 4, wherein the first light-emitting element and the second light-emitting element are positioned side by side in a second direction. (Note 6) The first recess and the second recess are located inside the frame when viewed from above. The inner surface of the frame portion defining the first recess, the first light-emitting element, the wall portion, and the third light-emitting element are arranged in order in the first direction. In a top view, the length from the first light-emitting element to the wall in the first direction is shorter than the length from the first light-emitting element to the inner surface in the first direction. A light-emitting device as described in any one of the appendices 1 to 5. (Note 7) The light-emitting device according to any one of appendices 1 to 6, comprising a first light-diffusing member that overlaps with the first light-emitting element in a top view and at least a portion of which is located above the wall portion. (Note 8) The light-emitting device according to Appendix 7, which includes a second light-diffusing member that overlaps with the third light-emitting element in a top view, is located at least in part above the wall, and is located away from the first light-diffusing member. [Explanation of Symbols]

[0115] 1,1A,1B,1C,1D,1E,1F,1G,1H Light-emitting device 10 Support 20 Lead 21 First Lead 22. Second lead 23 Third lead 24 4th lead 25. 5th lead 26. Sixth lead 30 Resin molded body 31 Bottom 32 Frame section 33 Wall section 41. First light-emitting element 42. Second light-emitting element 43 Third light-emitting element 60 wires 71 First translucent member 72,72A 2nd translucent member 73 Third translucent member 81 First light-diffusing member 82 Second light-diffusing member 91 First Optical Control Unit 92 Second Optical Control Unit 95 4th translucent member 101 First recess 101a 1st bottom 102 Second recess 102a 2nd bottom 721 1st transparent section 722 2nd transparent part

Claims

1. A support having a first recess and a second recess separated by a wall, wherein, in a top view, the area of ​​the first bottom surface defining the first recess is larger than the area of ​​the second bottom surface defining the second recess, The first light-emitting element and the second light-emitting element located within the first recess, A third light-emitting element located within the second recess, A first translucent member is located within the first recess and includes a first wavelength conversion member having an emission peak wavelength longer than the emission peak wavelength of the first light-emitting element, and is positioned so as to overlap the first light-emitting element and the second light-emitting element in a top view, and away from the third light-emitting element in a top view, It has a second translucent member located within the second recess and overlapping with the third light-emitting element in a top view, The first light-emitting element, the second light-emitting element, and the third light-emitting element are independently drivable. A light-emitting device wherein the emission peak wavelength of the first light-emitting element is longer than the emission peak wavelength of the second light-emitting element and the emission peak wavelength of the third light-emitting element.

2. The light-emitting device according to claim 1, wherein the second light-transmitting member has, in a top view, the first light-emitting element, the second light-emitting element, the third light-emitting element, and a first light-transmitting portion that overlaps with the wall portion.

3. The light-emitting device according to claim 2, further comprising a third light-emitting member located between the first light-transmitting member and the first light-transmitting portion, and including a second wavelength conversion member having an emission peak wavelength shorter than the emission peak wavelength of the first light-emitting element.

4. The first light-emitting element and the third light-emitting element are positioned side by side in the first direction. The light-emitting device according to any one of claims 1 to 3, wherein the length of the third light-emitting element in the first direction is shorter than the length of the third light-emitting element in the second direction perpendicular to the first direction.

5. The light-emitting device according to any one of claims 1 to 3, wherein the first light-emitting element and the second light-emitting element are positioned side by side in a second direction.

6. The first recess and the second recess are located inside the frame when viewed from above. The inner surface of the frame portion defining the first recess, the first light-emitting element, the wall portion, and the third light-emitting element are arranged in order in the first direction. The light-emitting device according to any one of claims 1 to 3, wherein, in a top view, the length from the first light-emitting element to the wall in the first direction is shorter than the length from the first light-emitting element to the inner surface in the first direction.

7. The light-emitting device according to any one of claims 1 to 3, further comprising a first light-diffusing member that overlaps with the first light-emitting element in a top view and at least a portion of which is located above the wall portion.

8. The light-emitting device according to claim 7, comprising a second light-diffusing member which overlaps with the third light-emitting element in a top view, at least a portion of which is located above the wall, and which is located away from the first light-diffusing member.

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