Light-emitting device

Abstract

To provide a light-emitting device capable of emitting light in a wider range of chromaticity as luminous colors.SOLUTION: The present light-emitting device comprises: first and second light-emitting elements which are drivable independently of each other; a wall part located between the first and the second light-emitting elements in plan view; and a translucent member that transmits light from the first and second light-emitting elements. The translucent member includes a first translucent part covering the side surface of the first light-emitting element and including a first wavelength conversion member, a second translucent part covering the side surface of the second light-emitting element and including a second wavelength conversion member, and a third translucent part located upward of the first and second light-emitting elements and the first and second translucent parts. The height of the wall part is lower than the height of the first and second light-emitting elements, and the emission peak wavelength of the first wavelength conversion member is longer than the emission peak wavelength of the second wavelength conversion member.SELECTED DRAWING: Figure 1B

Description

Technical Field

[0001] The present disclosure relates to a light-emitting device.

Background Art

[0002] Generally, a light-emitting device using a light-emitting element such as a light-emitting diode is widely used as various light sources such as lighting fixtures. As such a light-emitting device, for example, Patent Document 1 discloses a first light-emitting element and a second light-emitting element that can be independently driven, a wall portion that separates the first light-emitting element and the second light-emitting element, and a first light-transmissive member that is separated from the second light-emitting element by the wall portion and covers at least a part of the side surface of the first light-emitting element and includes a first wavelength conversion member. In a plan view, a second light-transmissive member that covers the first light-emitting element, the second light-emitting element, and the first light-transmissive member and includes a second wavelength conversion member is provided. A light-emitting device is disclosed in which 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

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to provide a light-emitting device capable of emitting light with a wider range of chromaticity as an emission color.

Means for Solving the Problems

[0005] The light-emitting device according to an embodiment of the present disclosure includes a first light-emitting element and a second light-emitting element that can be independently driven, a wall portion located between the first light-emitting element and the second light-emitting element in a plan view, and a light-transmitting member that transmits light from the first light-emitting element and the second light-emitting element. The light-transmitting member includes a first light-transmitting portion that covers a side surface of the first light-emitting element and includes a first wavelength conversion member, a second light-transmitting portion that covers a side surface of the second light-emitting element and includes a second wavelength conversion member, and a third light-transmitting portion located above the first light-emitting element, the second light-emitting element, the first light-transmitting portion, and the second light-transmitting portion. The height of the wall portion is lower than the heights of the first light-emitting element and the second light-emitting element, and the emission peak wavelength of the first wavelength conversion member is longer than the emission peak wavelength of the second wavelength conversion member.

Effect of the Invention

[0006] According to an embodiment of the present disclosure, it is possible to provide a light-emitting device that can emit light with a wider range of chromaticity as a light-emitting color.

Brief Description of the Drawings

[0007]

Figure 1A

Figure 1B

Figure 2A

Figure 2B

Figure 3

Figure 4A

Figure 4B

Figure 4C

Figure 5

Figure 6A

Figure 6B

Figure 7

Mode for Carrying Out the Invention

[0008] Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the following description, terms indicating specific directions and 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 exemplify a light-emitting device and the like for embodying the technical idea of the present invention, and do not limit the present invention as follows. Also, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are not intended to limit the scope of the present invention only thereto, but are intended to be exemplified unless otherwise specified. Also, the content described in one embodiment is applicable to other embodiments and modifications. 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 the drawings becoming overly complex, a schematic diagram in which the illustration of some elements is omitted 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 the present disclosure includes a first light-emitting element and a second light-emitting element that can be independently driven, a wall portion located between the first light-emitting element and the second light-emitting element in a plan view, and a light-transmitting member that transmits light from the first light-emitting element and the second light-emitting element. The light-transmitting member includes a first light-transmitting portion that covers a side surface of the first light-emitting element and includes a first wavelength conversion member, a second light-transmitting portion that covers a side surface of the second light-emitting element and includes a second wavelength conversion member, and a third light-transmitting portion located above the first light-emitting element, the second light-emitting element, the first light-transmitting portion, and the second light-transmitting portion. The height of the wall portion is lower than the heights of the first light-emitting element and the second light-emitting element, and the emission peak wavelength of the first wavelength conversion member is longer than the emission peak wavelength of the second wavelength conversion member.

[0011] [Light-emitting device 1] As an example of the light-emitting device according to the present disclosure, the light-emitting device 1 will be described. FIG. 1A is a schematic top view illustrating a light-emitting device according to the first embodiment. FIG. 1B is a schematic cross-sectional view taken along line IB-IB of FIG. 1A. FIG. 2A is a schematic top view of the light-emitting device shown in FIG. 1 with the light-transmitting member removed. FIG. 2B is a schematic cross-sectional view taken along line IIB-IIB of FIG. 2A. Note that the cross-sectional views of FIGS. 1B and 2B show a first cross-section perpendicular to the upper surface of the first light-emitting element passing through the first light-emitting element and the second light-emitting element.

[0012] In each drawing, for reference, an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other are shown as necessary. The direction parallel to the X-axis is referred to as the X direction, the direction parallel to the Y-axis is referred to as the Y direction, and the direction parallel to the Z-axis is referred to as the Z direction. Also, in the X direction, the direction in which the arrow is pointing is referred to as the +X direction, and the direction opposite to the +X direction is referred to as the -X direction. In the Y direction, the direction in which the arrow is pointing is referred to as the +Y direction, and the direction opposite to the +Y direction is referred to as the -Y direction. In the Z direction, the direction in which the arrow is pointing is referred to as the +Z direction, and the direction opposite to the +Z direction is referred to as the -Z direction. However, these do not limit the orientation of the light-emitting device during use, and the orientation of the light-emitting device is arbitrary. Also, viewing an object from the +Z direction to the -Z direction is referred to as a plan view.

[0013] The light-emitting device 1 illustrated in FIGS. 1A to 2B includes a package 10, a first light-emitting element 41 and a second light-emitting element 42, a first protective element 51 and a second protective element 52, a wire 60, and a light-transmissive member 70.

[0014] The package 10 includes a lead frame 20 and a resin molded body 30. The lead frame 20 is held by the resin molded body 30.

[0015] The lead frame 20 has conductivity and can function as an electrode for supplying power to the first light-emitting element 41, the second light-emitting element 42, the first protective element 51, and the second protective element 52. The lead frame 20 includes a first lead 21, a second lead 22, a third lead 23, and a fourth lead 24. The first lead 21, the second lead 22, the third lead 23, and the fourth lead 24 are arranged at intervals from each other via the resin molded body 30.

[0016] The resin molded body 30 can 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 frame 20. The frame portion 32 protrudes in the +Z direction on the outer periphery of the bottom portion 31 and surrounds the first light-emitting element 41 and the second light-emitting element 42 in plan view. The frame portion 32 may be integral with or separate from the bottom portion 31. The wall portion 33 is located between the first light-emitting element 41 and the second light-emitting element 42 in plan view inside the frame portion 32 in plan view. The wall portion 33 may be integral with or separate from the bottom portion 31. Based on the upper surface of the lead frame 20, the height of the wall portion 33 is lower than the heights of the first light-emitting element 41 and the second light-emitting element 42. Note that the broken line A in FIG. 1B is a virtual line indicating the height-direction boundary between the bottom portion 31, the frame portion 32, and the wall portion 33. The broken line A is in the same plane as the upper surface of the lead frame 20. The package 10 has a recess 30x defined by the upper surface of the lead frame 20, the upper surface of the bottom portion 31, and the inner surface of the frame portion 32.

[0017] The first light-emitting element 41 is disposed on the first lead 21, and the second light-emitting element 42 is disposed on the second lead 22. The first light-emitting element 41 and the second light-emitting element 42 are electrically connected to necessary portions of the lead frame 20 by wires 60. The first light-emitting element 41 and the second light-emitting element 42 can be driven independently. The first protection element 51 is disposed on the third lead 23, and the second protection element 52 is disposed on the fourth lead 24.

[0018] The light-transmitting member 70 transmits light from the first light-emitting element 41 and the second light-emitting element 42. The light-transmitting member 70 includes, as a minimum configuration, a first light-transmitting portion 71, a second light-transmitting portion 72, and a third light-transmitting portion 73.

[0019] The first light-transmitting portion 71 covers the side surface of the first light-emitting element 41 and includes a first wavelength conversion member. The second light-transmitting portion 72 covers the side surface of the second light-emitting element 42 and includes a second wavelength conversion member. The emission peak wavelength of the first wavelength conversion member is longer than the emission peak wavelength of the second wavelength conversion member. The third light-transmitting portion 73 is located above the first light-emitting element 41, the second light-emitting element 42, the first light-transmitting portion 71, and the second light-transmitting portion 72. The third light-transmitting portion 73 can include a third wavelength conversion member. The third light-transmitting portion 73 may not include a wavelength conversion member.

[0020] When the third light-transmitting portion 73 includes a third wavelength conversion member, it is preferable that the emission peak wavelength of the third wavelength conversion member is shorter than the emission peak wavelength of the first wavelength conversion member and longer than the emission peak wavelength of the second wavelength conversion member. Thereby, the chromaticity of the emitted light emitted from the first light-transmitting portion 71, the chromaticity of the emitted light emitted from the second light-transmitting portion 72, and the chromaticity of the emitted light emitted from the third light-transmitting portion 73 can be easily made different. Further, since the emission peak wavelength of the third wavelength conversion member is longer than the emission peak wavelength of the second wavelength conversion member, the ratio of the light emitted from the second wavelength conversion member being absorbed by the third wavelength conversion member can be reduced.

[0021] In the example of the light-emitting device 1 shown, the translucent member 70 further includes a fourth translucent portion 74 and a fifth translucent portion 75. The fourth translucent portion 74 covers the upper surface of the first light-emitting element 41 and can include a fourth wavelength conversion member. It is preferable that the emission peak wavelength of the fourth wavelength conversion member is longer than the emission peak wavelength of the third wavelength conversion member. Thereby, the ratio of the light emitted from the fourth wavelength conversion member being absorbed by the third wavelength conversion member can be reduced. It is preferable that the side surface of the first light-emitting element 41 is exposed from the fourth translucent portion 74. Thereby, the light from the first light-emitting element 41 is likely to hit the first translucent portion 71.

[0022] The fifth translucent portion 75 covers the upper surface of the second light-emitting element 42 and can include a fifth wavelength conversion member. It is preferable that the emission peak wavelength of the fifth wavelength conversion member is shorter than the emission peak wavelength of the third wavelength conversion member. Thereby, the chromaticity of the emitted light emitted from the first translucent portion 71 and the chromaticity of the emitted light emitted from the fifth translucent portion 75 can be easily made different. It is preferable that the side surface of the second light-emitting element 42 is exposed from the fifth translucent portion 75. Thereby, the light from the second light-emitting element 42 is likely to hit the second translucent portion 72.

[0023] When the light-emitting device 1 is driven, current is supplied to the first light-emitting element 41 and the second light-emitting element 42 from an external power source via the lead frame 20, and the first light-emitting element 41 and the second light-emitting element 42 emit light. The light from the first light-emitting element 41 and the second light-emitting element 42 includes light traveling upward, sideward, and downward from each light-emitting element.

[0024] The light emitted from the light-emitting device 1 includes the light emitted from the first light-emitting element 41 and passing through the first light-transmitting portion 71 and the third light-transmitting portion 73, the light emitted from the first light-emitting element 41 and passing through the fourth light-transmitting portion 74 and the third light-transmitting portion 73, and the light emitted from the first light-emitting element 41 and passing through the fourth light-transmitting portion 74, the first light-transmitting portion 71, and the third light-transmitting portion 73. Further, the light emitted from the light-emitting device 1 includes the light emitted from the second light-emitting element 42 and passing through the second light-transmitting portion 72 and the third light-transmitting portion 73, the light emitted from the second light-emitting element 42 and passing through the fifth light-transmitting portion 75 and the third light-transmitting portion 73, and the light emitted from the second light-emitting element 42 and passing through the fifth light-transmitting portion 75, the second light-transmitting portion 72, and the third light-transmitting portion 73.

[0025] As described above, the emission peak wavelength of the first wavelength conversion member included in the first light-transmitting portion 71 is longer than the emission peak wavelength of the second wavelength conversion member included in the second light-transmitting portion 72. Thereby, when viewed on the 1931 CIE chromaticity diagram, the x value of the chromaticity of the light emitted from the first light-emitting element 41 and emitted from the light-emitting device 1 through the first light-transmitting portion 71 is higher than the x value of the chromaticity of the light emitted from the second light-emitting element 42 and emitted from the light-emitting device 1 through the second light-transmitting portion 72. As a result, the chromaticity of the light emitted from the first light-emitting element 41 and emitted from the light-emitting device 1 through the first light-transmitting portion 71 and the chromaticity of the light emitted from the second light-emitting element 42 and emitted from the light-emitting device 1 through the second light-transmitting portion 72 can be easily made different. For example, by appropriately adjusting the types and amounts of the first wavelength conversion member and the second wavelength conversion member, light of a desired chromaticity can be emitted. Therefore, the light-emitting device 1 can emit light of a wide range of chromaticities. That is, it is possible to realize a light-emitting device 1 that can emit light of a wider range of chromaticities than in the prior art as the emission color.

[0026] As an example, the first light-emitting element 41 and the second light-emitting element 42 are light-emitting elements that emit blue light. The first wavelength conversion member included in the first light-transmitting portion 71 is a red phosphor, the second wavelength conversion member included in the second light-transmitting portion 72 is a blue phosphor, the third light-transmitting portion 73 does not include a wavelength conversion member such as a third wavelength conversion member, the fourth light-transmitting portion 74 does not include a wavelength conversion member such as a fourth wavelength conversion member, and the fifth light-transmitting portion 75 does not include a wavelength conversion member such as a fifth wavelength conversion member. In the chromaticity diagram shown in FIG. 3, chromaticity adjustment is possible on the straight line indicated by the arrow.

[0027] In FIG. 3, the chromaticity coordinates (x, y) of point P1 are (0.458, 0.410), and the chromaticity coordinates (x, y) of point P2 are (0.188, 0.268). The color temperature of point P1 is 2700K, and the color temperature of point P2 is 10000K or higher. In the light-emitting device 1, the type and amount of the first wavelength conversion member included in the first light-transmitting portion 71 and the second wavelength conversion member included in the second light-transmitting portion 72 are adjusted so that light of the chromaticity of point P1 is emitted from the light-emitting device 1 when only the first light-emitting element 41 emits light, and light of the chromaticity of point P2 is emitted from the light-emitting device 1 when only the second light-emitting element 42 emits light. When both the first light-emitting element 41 and the second light-emitting element 42 emit light, by adjusting the value of the current flowing through the first light-emitting element 41 and the second light-emitting element 42, light of an arbitrary chromaticity located on the straight line indicated by the arrow connecting point P1 and point P2 can be emitted from the light-emitting device 1.

[0028] Note that the chromaticity coordinates of point P1 and point P2 shown in FIG. 3 are only examples, and by adjusting the type and amount of the first wavelength conversion member included in the first light-transmitting portion 71 and the second wavelength conversion member included in the second light-transmitting portion 72, other chromaticity coordinates are also possible. For example, point P1 can be a point with chromaticity coordinates (x, y) of (0.570, 0.420) and a color temperature of 1700K, and point P2 can be a point with chromaticity coordinates (x, y) of (0.312, 0.328) and a color temperature of 6500K. Also in this case, when both the first light-emitting element 41 and the second light-emitting element 42 emit light, by adjusting the value of the current flowing through the first light-emitting element 41 and the second light-emitting element 42, light of an arbitrary chromaticity located on the straight line indicated by the arrow connecting point P1 and point P2 can be emitted from the light-emitting device 1.

[0029] Further, when the third light-transmitting portion 73 includes a third wavelength conversion member and the emission peak wavelength of the third wavelength conversion member is shorter than the emission peak wavelength of the first wavelength conversion member and longer than the emission peak wavelength of the second wavelength conversion member, the degree of freedom in adjusting the chromaticity point can be improved. That is, by adjusting the types and amounts of the first wavelength conversion member, the second wavelength conversion member, and the third wavelength conversion member, it becomes possible to set the points P1 and P2 to chromaticity coordinates different from those in FIG. 3.

[0030] Furthermore, when the fourth light-transmitting portion 74 includes a fourth wavelength conversion member and the emission peak wavelength of the fourth wavelength conversion member is longer than the emission peak wavelength of the third wavelength conversion member, and / or when the fifth light-transmitting portion 75 includes a fifth wavelength conversion member and the emission peak wavelength of the fifth wavelength conversion member is shorter than the emission peak wavelength of the third wavelength conversion member, the degree of freedom in adjusting the chromaticity point can be further improved. That is, by adjusting the types and amounts of the first wavelength conversion member, the second wavelength conversion member, the third wavelength conversion member, the fourth wavelength conversion member, and / or the fifth wavelength conversion member, it becomes possible to set the points P1 and P2 to chromaticity coordinates different from those in FIG. 3.

[0031] Hereinafter, details of each member included in the light-emitting device 1 will be described.

[0032] (Lead frame 20) A part of the upper surfaces of the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24 that constitute the lead frame 20 can be exposed inside the frame portion 32 in a plan view. The upper surfaces of the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24 are, for example, in the same plane as the upper surface of the bottom portion 31. The lower surfaces of the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24 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, the second lead 22, the third lead 23, and the fourth lead 24 are, for example, in the same plane as the lower surface of the bottom portion 31. When the lower surfaces of the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24 are exposed from the lower surface of the bottom portion 31 of the resin molded body 30, heat from the light-emitting device 1 can be easily transmitted to the substrate on which the light-emitting device 1 is mounted through each lead. Therefore, the heat dissipation performance of the light-emitting device 1 can be improved. In addition, the lower surfaces of the leads exposed from the lower surface of the bottom portion 31 can be used as external terminal portions for electrically connecting to the substrate. The light-emitting device 1 may include five or more leads.

[0033] Examples of the material of the lead frame 20 include metals such as copper, aluminum, gold, silver, iron, nickel, or alloys thereof, phosphor bronze, copper containing iron, etc. In particular, it is preferable to use copper having high heat dissipation performance as the material of the lead frame 20. The lead frame 20 can be formed into a predetermined shape by processing such as rolling, punching, extrusion, wet or dry etching, or a combination thereof. The lead frame 20 may be single-layer or may have a laminated structure (for example, a clad material).

[0034] The lead frame 20 may have a plating layer on its surface. For the plating layer, for example, gold, silver, copper, platinum, aluminum, or an alloy containing one of these may be used for the purpose of improving reflectivity. Since gold is less likely to corrode compared to silver or the like, when the plating layer contains gold, the reliability of the light-emitting device 1 can be improved. When the plating layer contains silver, it is preferable to provide a protective film such as silicon oxide on the surface of the plating layer. Thereby, it is possible to reduce the discoloration of the silver-containing plating layer due to sulfur components or the like in the atmosphere. The protective film is preferably composed of an oxide, nitride, or oxynitride of at least one element selected from the group consisting of silicon, aluminum, zirconium, titanium, zinc, magnesium, tantalum, niobium, yttrium, indium, tin, and hafnium. Among these, an oxide, nitride, or oxynitride of at least one element selected from the group consisting of silicon, aluminum, and zirconium, which has a relatively low water vapor permeability, is particularly preferable. The protective film may be a single-layer film or a multilayer film. The protective film can be formed by at least one of sputtering, vapor deposition, and atomic layer deposition (ALD method). Among these, the sputtering method is preferable in terms of simplicity, and the atomic layer deposition method is preferable in terms of easily forming a dense film with low water vapor permeability.

[0035] In the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24, a groove 20x may be provided on the side closer to the frame portion 32 in plan view. The groove 20x is recessed downward from the upper surfaces of the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24. The groove 20x can be formed by etching, pressing, or the like. In the light-emitting device 1, the groove 20x is provided in each of the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24. In FIG. 2A, for convenience, the groove 20x is shown as a dot pattern. A part of the resin molded body 30 is preferably disposed in the groove 20x. Thereby, the adhesion between the resin molded body 30 and the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24 can be improved.

[0036] (Resin molded body 30) The resin molded body 30 defines part of the recess 30x by the upper surface of the bottom portion 31 and the inner surface of the frame portion 32. The bottom surface that defines the recess 30x is composed of the upper surface of the lead frame 20 and the upper surface of the bottom portion 31. The inner surface of the frame portion 32 may be an inclined surface that is inclined with respect to the upper surface of the lead frame 20, or may be a vertical surface that is perpendicular to the upper surface of the lead frame 20. In the example of the light-emitting device 1, the inner surface of the frame portion 32 has an inclined surface that faces outward as it goes upward from the upper surface of the lead frame 20. Thereby, the light from the first light-emitting element 41 and the second light-emitting element 42 is easily reflected upward.

[0037] In the example of the light-emitting device 1, the planar shape of the bottom surface that defines the recess 30x is rectangular. Also, the planar shape of the upper end of the inner surface that defines the recess 30x is rectangular. Here, the rectangle includes not only a shape with right angles but also a shape with chamfered corners. The shape with chamfered corners includes a shape in which two orthogonal sides are connected to a curve, a shape in which two orthogonal sides are connected to a straight line, and the like.

[0038] The wall portion 33 is a member that separates the first light-emitting element 41 and the second light-emitting element 42. The wall portion 33 is located above the upper surface of the lead frame 20. In the example of the light-emitting device 1, the wall portion 33 extends in the Y direction and is continuously provided 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.

[0039] The form in which the wall portion 33 extends in the Y direction is not limited. The wall portion 33 may be, for example, a form in which a portion extending in the X direction and a portion extending in the Y direction intersect in a cross shape in plan view. In this case, one light-emitting element may be arranged in each of the four regions divided by the cross-shaped wall portion 33. Alternatively, the wall portion 33 may be annular in plan view. In this case, by arranging the light-emitting elements inside and outside the annular wall portion 33 respectively, color adjustment can be performed inside and outside the annular wall portion 33.

[0040] The wall portion 33 may or may not cover the upper surface of the first lead 21 and / or the upper surface of the second lead 22. By the wall portion 33 covering the upper surface of the first lead 21 and / or the upper surface of the second lead 22, the adhesion between the wall portion 33 and the first lead 21 and / or the second lead 22 is improved. By the wall portion 33 not covering the upper surface of the first lead 21 and / or the upper surface of the second lead 22, the area of the lead frame 20 exposed from the resin molded body 30 at the bottom surface defining the recess 30x can be increased. Thereby, it becomes easier to arrange the first light-emitting element 41 and / or the second light-emitting element 42 on the lead frame 20.

[0041] Since the light-emitting device 1 has the wall portion 33, it becomes difficult for the first light-transmitting portion 71 and the second light-transmitting portion 72 to come into contact with each other. Also, since the light-emitting device 1 has the wall portion 33, it becomes difficult for the light from the first light-emitting element 41 to hit the second light-transmitting portion 72, and it becomes difficult for the light from the second light-emitting element 42 to hit the first light-transmitting portion 71. By doing so, it becomes easier to increase the difference between the chromaticity when only the first light-emitting element 41 emits light and the chromaticity when only the second light-emitting element 42 emits light. Thereby, it becomes easier to enable the light-emitting device 1 to emit light with a wide range of chromaticities.

[0042] In the present embodiment, the shape of the wall portion 33 is rectangular in a cross-sectional view. The corners of the rectangle may be chamfered, rounded, or the like. However, the shape of the wall portion 33 is not particularly limited, and for example, in a cross-sectional view, it may be trapezoidal, triangular, substantially semi-circular, substantially semi-elliptical, a shape with an upward curvature, a shape with an upward inclination, or the like, and also, for example, a shape with a step may be used.

[0043] The angle located inside the recess 30x within the angle formed by the side surface of the wall portion 33 facing the first light-emitting element 41 and the upper surface of the lead frame 20 is defined as the first angle. The angle located inside the recess 30x within the angle formed by the inner surface of the frame portion 32 defining the recess 30x facing the first light-emitting element 41 and the upper surface of the lead frame 20 is defined as the second angle. As shown in FIG. 1B, the first angle is preferably 90° or more and smaller than the second angle. By doing so, it becomes easier to reduce the length of the wall portion 33 in the X direction. As a result, it becomes easier to arrange the first light-emitting element 41 and the second light-emitting element 42 closer to each other, so it becomes easier to improve the color mixing property of the light-emitting device 1. Also, the upper surface of the wall portion 33 may have irregularities or the upper surface of the wall portion 33 may be inclined with respect to the upper surface of the lead frame 20.

[0044] With reference to the upper surface of the lead frame 20, the height of the wall portion 33 is preferably lower than the heights of the first light-emitting element 41 and the second light-emitting element 42. That is, it is preferable that the upper surfaces of the first light-emitting element 41 and the second light-emitting element 42 are at positions higher than the upper surface of the wall portion 33. Note that the height in this case is the length from the upper surface of the lead frame 20 to the portion farthest in the Z direction in each member.

[0045] According to such a configuration, the light emitted from the first light-emitting element 41 and the light emitted from the second light-emitting element 42 are likely to mix, and the color mixing property is improved. The difference between the height of the wall portion 33 and the heights of the first light-emitting element 41 and the second light-emitting element 42 is preferably 50 μm or more and 200 μm or less. If the difference is 50 μm or more, the color mixing property is more likely to be improved. On the other hand, if the difference is 200 μm or less, it becomes difficult for the first light-transmitting portion 71 and / or the second light-transmitting portion 72 to cross over the wall portion 33.

[0046] The width W of the wall portion 33 is not particularly limited, but is preferably 50 μm or more and 250 μm or less. If the width W of the wall portion 33 is 50 μm or more, it becomes difficult for the first light-transmitting portion 71 and the second light-transmitting portion 72 to cross over the wall portion 33. On the other hand, if it is 250 μm or less, the color mixing property is more likely to be improved. Note that the width W of the wall portion 33 is the maximum value of the length of the wall portion 33 in the direction (X direction) orthogonal to the direction (Y direction) in which the wall portion 33 extends.

[0047] For the resin material serving as the base material of the resin molded body 30, known materials such as thermosetting resins and thermoplastic resins can be used. In the case of a thermoplastic resin, for example, polyphthalamide resin, polybutylene terephthalate (PBT), unsaturated polyester, etc. can be used. In the case of a thermosetting resin, for example, epoxy resin, modified epoxy resin, silicone resin, modified silicone resin, etc. can be used. In particular, as the resin material, it is preferable to use thermosetting resins such as epoxy resin and silicone resin that are excellent in heat resistance and light resistance.

[0048] The resin molded body 30 preferably contains a light-reflective substance in the above-mentioned resin material serving as the base material. As the light-reflective substance, it is preferable to use a member that is difficult to absorb light from the light-emitting element and has a large refractive index difference with respect to the resin material serving as the base material. Examples of such light-reflective substances include titanium oxide, zinc oxide, silicon oxide, zirconium oxide, aluminum oxide, aluminum nitride, etc.

[0049] 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, even when the resin molded body 30 discolors, a decrease in light extraction efficiency can be reduced. Examples of the dark-colored resin include resins containing a filler such as carbon such as acetylene black, activated carbon, and graphite, transition metal oxides such as iron oxide, manganese dioxide, cobalt oxide, and molybdenum oxide, or colored organic pigments. The concentration of colors such as black and gray may be adjusted by the addition amount of the filler, etc. Examples of the resin include the resin materials serving as the base material of the above-mentioned resin molded body 30. The resin molded body 30 may be formed of two types of resins, namely, a dark-colored resin and a white-colored resin containing a light-reflective substance.

[0050] In the resin molded body 30, a reflective member may be provided on the bottom surface and the inner surface that define the concave portion 30x. Thereby, it becomes possible to efficiently extract upward the light emitted from the first light-emitting element 41 and the second light-emitting element 42 and the wavelength-converted light, and the light extraction efficiency of the light-emitting device 1 can be improved. As the reflective member, a member that is less likely to transmit or absorb light from the light-emitting element, external light, etc. is preferable. The reflective member is preferably white. As the resin material serving as the base material of the reflective member, the same resin material as that used in the resin molded body 30 can be used. The reflective member contains a light-reflective substance in these resin materials serving as the base materials. As the light-reflective substance, it is preferable to use a member that is less likely to absorb the light from the light-emitting element and has a large refractive index difference with respect to the resin material serving as the base material. Examples of such light-reflective substances include titanium oxide, zinc oxide, silicon oxide, zirconium oxide, aluminum oxide, aluminum nitride, and the like.

[0051] In addition, when providing the reflective member, it is preferable to provide a groove on the upper surface of the lead frame 20 that surrounds each of the first light-emitting element 41 and the second light-emitting element 42 in a plan view. Thereby, each groove serves to block the reflective member, and it is possible to reduce the decrease in the light emission efficiency due to the reflective member coming into contact with the first light-emitting element 41 and the second light-emitting element 42.

[0052] (First Light-Emitting Element and Second Light-Emitting Element) The first light-emitting element 41 and the second light-emitting element 42 are semiconductor elements that emit light by themselves when a voltage is applied. The shape, size, etc. of the first light-emitting element 41 and the second light-emitting element 42 can be arbitrarily selected. Examples of the first light-emitting element 41 and the second light-emitting element 42 include LED chips. The first light-emitting element 41 and the second light-emitting element 42 include a semiconductor structure. The semiconductor structure includes an n-type semiconductor layer and a p-type semiconductor layer, and a light-emitting layer sandwiched therebetween. The light-emitting layer may have a structure such as a double heterojunction or a single quantum well (SQW), or may have a structure having a group of light-emitting layers in one lump such as a multiple quantum well (MQW). The light-emitting layer can be configured to emit, for example, visible light or ultraviolet light.

[0053] The semiconductor structure may include a plurality of light-emitting portions each including an n-side semiconductor layer, an active layer, and a p-side semiconductor layer. When the semiconductor structure includes a plurality of light-emitting portions, each light-emitting portion may include well layers having different emission peak wavelengths, or may include well layers having the same emission peak wavelength. Note that the case where the emission peak wavelengths are the same includes the case where there is a variation of about several nm. The combination of the emission peak wavelengths of the plurality of light-emitting portions can be appropriately selected. For example, when the semiconductor structure includes two light-emitting portions, examples of the combination of the light emitted from each light-emitting portion include a combination of 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 portions, an example of the combination of the light emitted from each light-emitting portion is a combination of blue light, green light, and red light. Each light-emitting portion may include one or more well layers having an emission peak wavelength different from that of other well layers.

[0054] As the first light-emitting element 41 and the second light-emitting element 42, for example, a light-emitting element having a blue emission color (light with a wavelength of 430 to 490 nm) can be used. However, as the emission colors of the first light-emitting element 41 and the second light-emitting element 42, those having arbitrary wavelengths can be selected according to the application. For example, as the light-emitting element having a blue emission color (light with a wavelength of 430 to 490 nm) or a green emission color (light with a wavelength of 495 to 565 nm), those using a nitride-based semiconductor (In x Al y Ga 1-x-y N (0 ≦ x, 0 ≦ y, x + y ≦ 1), GaP, etc. can be used. As the light-emitting element having a red emission color (light with a wavelength of 610 to 700 nm), in addition to the nitride-based semiconductor element, GaAlAs, AlInGaP, etc. can be used.

[0055] The emission peak wavelength of the second light-emitting element 42 is equal to or less than the emission peak wavelength of the first light-emitting element 41. That is, the emission peak wavelength of the second light-emitting element 42 may be the same as the emission peak wavelength of the first light-emitting element 41, or may be shorter than the emission peak wavelength of the first light-emitting element 41. For example, the emission peak wavelength of each of the first light-emitting element 41 and the second light-emitting element 42 can be around 450 nm. Alternatively, the emission peak wavelength of the first light-emitting element 41 can be around 450 nm, and the emission peak wavelength of the second light-emitting element 42 can be around 420 nm. When the emission peak wavelength of the second light-emitting element 42 is shorter than the emission peak wavelength of the first light-emitting element 41, it becomes easier for the second light-emitting element 42 to excite the wavelength conversion member included in the second light-transmitting portion 72 or the third light-transmitting portion 73.

[0056] The height of the second light-emitting element 42 may be the same as the height of the first light-emitting element 41, or may be lower than the height of the first light-emitting element 41. By reducing the height of the second light-emitting element 42, the thickness of the light-transmitting portion disposed on the second light-emitting element 42 can be increased. Thereby, since the adjustment range of the amount of the wavelength conversion member included in the light-transmitting portion disposed on the second light-emitting element 42 can be increased, it becomes easier to adjust the color tone. In particular, when blue light is emitted from the light-transmitting portion disposed on the second light-emitting element 42, since it is difficult to adjust the color tone of blue light, it is meaningful to increase the adjustment range of the amount of the wavelength conversion member included in the light-transmitting portion disposed on the second light-emitting element 42. Note that the first light-emitting element 41 and the second light-emitting element 42 may have the same size or different sizes in plan view.

[0057] The first light-emitting element 41 has a pair of element electrodes on its upper surface and 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 joined to the first lead 21 via the wire 60, and the other element electrode is joined to the third lead 23 via the 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 second lead 22. One element electrode of the second light-emitting element 42 is joined to the second lead 22 via the wire 60, and the other element electrode is joined to the fourth lead 24 via the wire 60. Each light-emitting element may be flip-chip mounted with the surface on which the electrodes are formed facing downward.

[0058] In the example of the light-emitting device 1, two light-emitting elements, i.e., the first light-emitting element 41 and the second light-emitting element 42, are mounted on the lead frame 20. However, the present invention is not limited thereto, and three or more light-emitting elements may be mounted on one light-emitting device. The three or more light-emitting elements may be independently driven. Note that at least one light-emitting element arranged in one region separated by the wall portion and at least one light-emitting element arranged in the other region may be independently driven. For example, a plurality of light-emitting elements arranged in one region separated by the wall portion may be connected in series and / or in parallel.

[0059] In the example of the light-emitting device 1, the first light-emitting element 41 and the second light-emitting element 42 are mounted on the lead frame 20, but a COB (Chip On Board) type light-emitting device in which the light-emitting elements are directly arranged on a substrate having electrode terminals may be used. In the COB type light-emitting device, a frame portion that covers the light-emitting elements in plan view may be provided on the upper surface of the substrate, and a light-transmissive member may be arranged inside the frame portion.

[0060] (First protection element and second protection element) The first protection element 51 and the second protection element 52 are, for example, Zener diodes. The first protection element 51 and the second protection element 52 are provided with element electrodes on their upper surfaces and are respectively mounted on the third lead 23 and the fourth lead 24. In the example of the light-emitting device 1, the electrodes of the first protection element 51 and the second protection element 52 are joined to the first lead 21 and the second lead 22 via wires 60 respectively. The first protection element 51 and the second protection element 52 can be provided as needed. Also, a varistor may be used as the first protection element 51 and the second protection element 52.

[0061] (First light-transmitting part) The first light-transmitting part 71 can be arranged on the +X side of the wall part 33 in the region surrounded by the frame part 32 and the wall part 33 so as to cover the side surface of the first light-emitting element 41. When the light-emitting device 1 does not include the fourth light-transmitting part 74, the first light-transmitting part 71 can be arranged so as to cover the upper surface of the first light-emitting element 41. The first light-transmitting part 71 may cover a part or all of the inner surface of the frame part 32 on the +X side of the wall part 33. When covering all, the light emitted by the first wavelength conversion member included in the first light-transmitting part 71 can be enhanced.

[0062] In the first light-transmitting part 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-transmitting part 71. The first light-transmitting part 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-transmitting part 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-transmitting part 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 phosphor (e.g., Lu3(Al,Ga)5O 12 :Ce), terbium-aluminum-garnet-based phosphor (e.g., Tb3(Al,Ga)5O 12 :Ce), CCA-based phosphor (e.g., Ca 10 (PO4)6Cl2:Eu), BAM-based phosphor (e.g., BaMgAl 10 O 17 :Eu 2+ )、SAE-based phosphor (e.g., Sr4Al 14 O 25 :Eu), chlorosilicate-based phosphor (e.g., Ca8MgSi4O 16 Cl2:Eu), silicate-based phosphor (e.g., (Ba,Sr,Ca,Mg)2SiO4:Eu), β-sialon-based phosphor (e.g., (Si,Al)3(O,N)4:Eu) or α-sialon-based phosphor (e.g., Ca(Si,Al) 12 (O,N) 16 :Eu) and other oxynitride-based phosphors, LSN-based phosphor (e.g., (La,Y)3Si6N 11 :Ce), BSESN-based phosphor (e.g., (Ba,Sr)2Si5N8:Eu), SLA-based phosphor (e.g., SrLiAl3N4:Eu), CASN-based phosphor (e.g., CaAlSiN3:Eu) or SCASN-based phosphor (e.g., (Sr,Ca)AlSiN3:Eu) and other nitride-based phosphors, KSF-based phosphor (e.g., K2SiF6:Mn), KSAF-based phosphor (e.g., K2(Si 1-x Al x )F 6-x :Mn Here, x satisfies 0 < x < 1.), or fluoride-based phosphors such as MGF-based phosphor (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 Here, 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.

[0063] As the first wavelength conversion member, for example, a red phosphor with 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. For this reason, compared with the case where red light is extracted by the red light-emitting element, by using the red phosphor as the first wavelength conversion member, it becomes easier to improve the color rendering property of the light-emitting device 1.

[0064] As the resin material for the base material of the first light-transmitting portion 71, the same resin material as that used in the resin molded body 30 can be used. In particular, it is preferable to use a silicone resin composition or an epoxy resin composition. Further, the first light-transmitting portion 71 may contain light-scattering particles such as titanium oxide, silicon oxide, zirconium oxide, and aluminum oxide.

[0065] The first light-transmitting portion 71 may be formed of, in addition to the resin material, ceramics, glass, a sintered body of a phosphor, or the like. Thereby, in a high-output light-emitting device, the reliability of the light-emitting device can be improved.

[0066] (Second light-transmitting portion) The second light-transmitting portion 72 can be disposed on the -X side of the wall portion 33 so as to cover the side surface of the second light-emitting element 42 in the region surrounded by the frame portion 32 and the wall portion 33. When the light-emitting device 1 does not include the fifth light-transmitting portion 75, the second light-transmitting portion 72 can be disposed so as to cover the upper surface of the second light-emitting element 42. The second light-transmitting portion 72 may cover a part or all of the inner surface of the frame portion 32 on the -X side of the wall portion 33. When covering all, the color tone of the light emitted by the second wavelength conversion member included in the second light-transmitting portion 72 can be enhanced.

[0067] In the second light-transmitting part 72, the content of the second 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 second light-transmitting part 72. The second light-transmitting part 72 may include one or more other wavelength conversion members together with the second wavelength conversion member. In this case, in a cross-sectional view, the area of each of the other wavelength conversion members in the second light-transmitting part 72 is smaller than the area of the second wavelength conversion member. By including other wavelength conversion members together with the second wavelength conversion member in the second light-transmitting part 72, the color rendering property of the light-emitting device 1 can be improved. Examples of the second wavelength conversion member include phosphors. Examples of the other wavelength conversion members include phosphors of a type different from that of the second wavelength conversion member. The phosphor can be appropriately selected from among the phosphors exemplified as the first wavelength conversion member.

[0068] As the second wavelength conversion member, for example, a blue 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 blue phosphor is, for example, 40 nm or more and 100 nm or less, and preferably 50 nm or more and 90 nm or less. The base material of the second light-transmitting part 72 can be appropriately selected from among the materials exemplified as the base material of the first light-transmitting part 71. Generally, compared with the emission spectrum of the blue light-emitting element, the half-value width of the emission spectrum of the light-emitting device using the blue phosphor tends to be wider. For this reason, compared with the case where blue light is extracted by the blue light-emitting element, by using a blue phosphor as the second wavelength conversion member, it becomes easier to improve the color rendering property of the light-emitting device 1. Further, the second light-transmitting part 72 may contain light-scattering particles in the same manner as the first light-transmitting part 71.

[0069] (The third light-transmitting part) The third light-transmitting part 73 can be arranged so as to cover the first light-emitting element 41, the second light-emitting element 42, the first light-transmitting part 71, and the second light-transmitting part 72. The third light-transmitting part 73 covers the first light-emitting element 41 via the first light-transmitting part 71 and / or the fourth light-transmitting part 74, and covers the second light-emitting element 42 via the second light-transmitting part 72 and / or the fifth light-transmitting part 75. The third light-transmitting part 73 can protect the light-emitting element and the like from external force, dust, moisture, and the like.

[0070] The third light-transmitting portion 73 may include one or more other wavelength conversion members together with the third wavelength conversion member. In this case, in a cross-sectional view, the area of each of the other wavelength conversion members in the third light-transmitting portion 73 is smaller than the area of the third wavelength conversion member. By including other wavelength conversion members together with the third wavelength conversion member in the third light-transmitting portion 73, the color rendering property of the light-emitting device 1 can be improved. Examples of the third wavelength conversion member include phosphors. Examples of the other wavelength conversion members include phosphors of a type different from that of the third wavelength conversion member. The phosphor can be appropriately selected from among the phosphors exemplified as the first wavelength conversion member. As the third wavelength conversion member, for example, it is preferable to use a phosphor having a wide half-value width. The base material of the third light-transmitting portion 73 can be appropriately selected from among the materials exemplified as the base material of the first light-transmitting portion 71. Also, the third light-transmitting portion 73 may contain light-scattering particles in the same manner as the first light-transmitting portion 71.

[0071] In the cross section shown in FIG. 1B, the maximum length L1 in the vertical direction of the third light-transmitting portion 73 located above the wall portion 33 is preferably longer than the maximum length L2 in the vertical direction of the third light-transmitting portion 73 located above the first light-emitting element 41 and the maximum length L3 in the vertical direction of the third light-transmitting portion 73 located above the second light-emitting element 42. By thickening the third light-transmitting portion 73 located above the wall portion 33, the light emitted from the first light-emitting element 41 and the light emitted from the second light-emitting element 42 are more likely to mix above the wall portion 33, and the color mixing property above the wall portion 33 is improved.

[0072] (Fourth light-transmitting portion, fifth light-transmitting portion) The fourth light-transmitting portion 74 may include one or more other wavelength conversion members together with the fourth wavelength conversion member. In this case, in a cross-sectional view, the area of each of the other wavelength conversion members in the fourth light-transmitting portion 74 is smaller than the area of the fourth wavelength conversion member. By including other wavelength conversion members together with the fourth wavelength conversion member in the fourth light-transmitting portion 74, the color rendering property of the light-emitting device 1 can be improved. Examples of the fourth wavelength conversion member include phosphors. Examples of the other wavelength conversion members include phosphors of a type different from that of the fourth wavelength conversion member. The phosphor can be appropriately selected from the phosphors exemplified as the first wavelength conversion member.

[0073] As the fourth 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 content of the fourth wavelength conversion member can be, for example, 30% by mass or more and 60% by mass or less with respect to the total mass of the fourth light-transmitting portion 74. The base material of the fourth light-transmitting portion 74 can be appropriately selected from the materials exemplified as the base material of the first light-transmitting portion 71. Further, the fourth light-transmitting portion 74 may contain light-scattering particles in the same manner as the first light-transmitting portion 71.

[0074] The first wavelength conversion member and the fourth wavelength conversion member may use phosphors having the same composition. When phosphors having the same composition are used for the first wavelength conversion member and the fourth wavelength conversion member, by changing the content of each phosphor, it becomes easy to adjust the chromaticity of the light emitted from the first light-transmitting portion 71 and the fourth light-transmitting portion 74, and the light of the light-emitting device 1 after color mixing can be efficiently made into desired light.

[0075] The fifth light-transmitting part 75 may include one or more other wavelength conversion members together with the fifth wavelength conversion member. In this case, in a cross-sectional view, the area of each of the other wavelength conversion members in the fifth light-transmitting part 75 is smaller than the area of the fifth wavelength conversion member. By including other wavelength conversion members together with the fifth wavelength conversion member in the fifth light-transmitting part 75, the color rendering property of the light-emitting device 1 can be improved. Examples of the fifth wavelength conversion member include phosphors. Examples of the other wavelength conversion members include phosphors of a type different from that of the fifth wavelength conversion member. The phosphor can be appropriately selected from among the phosphors exemplified as the first wavelength conversion member.

[0076] As the fifth wavelength conversion member, for example, a blue 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 blue phosphor is, for example, 40 nm or more and 100 nm or less, and preferably 50 nm or more and 90 nm or less. The content of the fifth wavelength conversion member can be, for example, 30% by mass or more and 60% by mass or less with respect to the total mass of the fifth light-transmitting part 75. The base material of the fifth light-transmitting part 75 can be appropriately selected from among the materials exemplified as the base material of the first light-transmitting part 71. Also, the fifth light-transmitting part 75 may contain light-scattering particles in the same manner as the first light-transmitting part 71.

[0077] The second wavelength conversion member and the fifth wavelength conversion member may use phosphors having the same composition. When phosphors having the same composition are used for the second wavelength conversion member and the fifth wavelength conversion member, by changing the content of each phosphor, it becomes easy to adjust the chromaticity of the light emitted from the second light-transmitting part 72 and the fifth light-transmitting part 75, and the light of the light-emitting device 1 after color mixing can be efficiently made into desired light.

[0078] The fifth light-transmitting part 75 may not include a wavelength conversion member. For example, when a blue light-emitting element is used for the second light-emitting element 42, since the fifth light-transmitting part 75 does not contain a phosphor, most of the light emitted from the fifth light-transmitting part 75 is the light of the second light-emitting element 42 with a large blue component. Thereby, the emitted light emitted from the fifth light-transmitting part 75 becomes light with a relatively small x value of chromaticity, and it is possible to easily make the chromaticity of the emitted light emitted from the first light-transmitting part 71 and the fourth light-transmitting part 74 different from the chromaticity of the emitted light emitted from the fifth light-transmitting part 75.

[0079] The fourth light-transmitting part 74 and the fifth light-transmitting part 75 can have various shapes. The fourth light-transmitting part 74 is preferably provided in a convex lens shape in which the portion located at the center of the upper surface of the first light-emitting element 41 is higher than the portion located at the periphery of the upper surface of the first light-emitting element 41. Similarly, the fifth light-transmitting part 75 is preferably provided in a convex lens shape in which the portion located at the center of the upper surface of the second light-emitting element 42 is higher than the portion located at the periphery of the upper surface of the second light-emitting element 42. Thereby, it becomes easy to reduce the light emitted from the first light-emitting element 41 or the like from being reflected by the surface of the fourth light-transmitting part 74 or the like and returning to the side of the first light-emitting element 41 or the like. The entire upper surface of the fourth light-transmitting part 74 and the fifth light-transmitting part 75 may be a curved surface. Thereby, it becomes easy to reduce the light emitted from the first light-emitting element 41 or the like from being reflected by the surface of the fourth light-transmitting part 74 or the like.

[0080] The fourth light-transmitting part 74 and the fifth light-transmitting part 75 may have the same height or different heights in the Z direction. For example, in the Z direction, the fourth light-transmitting part 74 can be made higher than the fifth light-transmitting part 75. Thereby, for example, the content of the fourth wavelength conversion member contained in the fourth light-transmitting part 74 can be increased. Thereby, it is possible to easily make the chromaticity of the light emitted from the fourth light-transmitting part 74 different from the chromaticity of the light emitted from the fifth light-transmitting part 75.

[0081] [Examples of combinations of phosphors] Regarding the combinations of phosphors included in each light-transmitting part of the light-transmitting member 70 of the light-emitting device 1 shown in FIG. 1, three examples, Example 1 to Example 3, are shown. In Examples 1 to 3, the necessary phosphors are selected and used from among Phosphor 1 to Phosphor 5.

[0082] Phosphor 1 is a phosphor with a peak wavelength of 440 - 460 nm. Examples of Phosphor 1 include CCA and BAM. The composition of CCA is, for example, Ca 10 (PO4)6Cl2:Eu. The composition of BAM is, for example, BaMgAl 10 O 17 :Eu 2+ .

[0083] Phosphor 2 is a phosphor with a peak wavelength of 490 - 530 nm. Examples of Phosphor 2 include SAE, β - sialon, GLAG, and chlorosilicate. The composition of SAE is, for example, Sr4Al 14 O 25 :Eu. The composition of β - sialon is, for example, (Si,Al)3(O,N)4:Eu. The composition of GLAG is, for example, Lu3(Al,Ga)5O 12 :Ce. The composition of chlorosilicate is, for example, Ca8MgSi4O 16 C l2 :Eu

[0084] Phosphor 3 is a phosphor with a peak wavelength of 530 - 560 nm. Examples of Phosphor 3 include LAG, GYAG, and YAG. The composition of LAG is, for example, Lu3Al5O 12 :Ce. The composition of GYAG is, for example, Y3(Al,Ga)5O 12 :Ce. The composition of YAG is, for example, Y3Al5O 12 :Ce

[0085] Phosphor 4 is a phosphor with a peak wavelength of 605 - 660 nm. Examples of Phosphor 4 include SCASN and CASN. The composition of SCASN is, for example, (Sr,Ca)AlSiN3:Eu. The composition of CASN is, for example, CaAlSiN3:Eu

[0086] The phosphor 5 is a phosphor with a peak wavelength of 620 to 640 nm. Examples of the phosphor 5 include, for example, KSF. The composition of KSF is, for example, K2SiF6:Mn.

[0087] (Example 1) The combination of Example 1 is shown in FIG. 4A. In FIG. 4A, the double circles indicate the elements essential for realizing the specifications of Example 1, and the circles indicate the elements that may be added as needed for color tone adjustment.

[0088] As shown in FIG. 4A, in Example 1, the first light-transmitting portion 71 includes the phosphor 3 as the first wavelength conversion member. The first light-transmitting portion 71 may or may not include the phosphor 4 and / or the phosphor 5 as other wavelength conversion members together with the first wavelength conversion member. The second light-transmitting portion 72 includes the phosphor 2 as the second wavelength conversion member. The third light-transmitting portion 73 includes the phosphor 2 as the third wavelength conversion member. The third light-transmitting portion 73 may or may not include the phosphor 3 as other wavelength conversion members together with the third wavelength conversion member. The fourth light-transmitting portion 74 includes the phosphor 4 as the fourth wavelength conversion member. The fourth light-transmitting portion 74 may or may not include the phosphor 3 as other wavelength conversion members together with the fourth wavelength conversion member. The fifth light-transmitting portion 75 includes the phosphor 2 as the fifth wavelength conversion member.

[0089] With the combination of phosphors shown in FIG. 4A, the color temperature of the light emitted from the light-emitting device 1 is around 2700K when only the first light-emitting element 41 emits light, and 10000K or more when only the second light-emitting element 42 emits light. When both the first light-emitting element 41 and the second light-emitting element 42 emit light, by adjusting the value of the current flowing through the first light-emitting element 41 and the second light-emitting element 42, light of any chromaticity located on the straight line connecting the chromaticity coordinates corresponding to the above two color temperatures can be emitted from the light-emitting device 1.

[0090] As shown in FIG. 4A, the second light-transmitting portion 72, the third light-transmitting portion 73, and the fifth light-transmitting portion 75 all contain the phosphor 2. In this case, by changing the content of the phosphor 2 in each light-transmitting portion, a light-emitting device 1 capable of emitting light with a wide range of chromaticities can be realized.

[0091] (Example 2) The combination of Example 2 is shown in FIG. 4B. In FIG. 4B, the double circles indicate the elements essential for realizing the specifications of Example 2, and the circles indicate the elements that may be added as needed for color tone adjustment.

[0092] As shown in FIG. 4B, Example 2 is different from Example 1 in that the second light-transmitting portion 72 may contain the phosphor 3 and / or the phosphor 4 as other wavelength conversion members together with the second wavelength conversion member. Thereby, the color tone of the light emitted from the light-emitting device 1 can be adjusted with respect to Example 1.

[0093] (Example 3) The combination of Example 3 is shown in FIG. 4C. In FIG. 4C, the double circles indicate the elements essential for realizing the specifications of Example 3, and the circles indicate the elements that may be added as needed for color tone adjustment.

[0094] As shown in FIG. 4C, in Example 3, the first light-transmitting portion 71 includes the phosphor 3 as the first wavelength conversion member. The first light-transmitting portion 71 may or may not include the phosphor 2 and / or the phosphor 4 as other wavelength conversion members together with the first wavelength conversion member. The second light-transmitting portion 72 includes the phosphor 1 as the second wavelength conversion member. The second light-transmitting portion 72 may or may not include the phosphor 3 and / or the phosphor 4 as other wavelength conversion members together with the second wavelength conversion member. The third light-transmitting portion 73 includes the phosphor 1 as the third wavelength conversion member. The third light-transmitting portion 73 may or may not include the phosphor 3 and / or the phosphor 4 as other wavelength conversion members together with the third wavelength conversion member. The fourth light-transmitting portion 74 includes the phosphor 4 as the fourth wavelength conversion member. The fourth light-transmitting portion 74 may or may not include the phosphor 2 as other wavelength conversion members together with the fourth wavelength conversion member. The fifth light-transmitting portion 75 may not include the fifth wavelength conversion member. The fifth light-transmitting portion 75 may or may not include the phosphor 1 and / or the phosphor 4 as other wavelength conversion members.

[0095] Due to the combination of phosphors shown in FIG. 4C, the color temperature of the light emitted from the light-emitting device 1 is around 2700K when only the first light-emitting element 41 emits light, and is 10000K or more when only the second light-emitting element 42 emits light. When both the first light-emitting element 41 and the second light-emitting element 42 emit light, by adjusting the value of the current flowing through the first light-emitting element 41 and the second light-emitting element 42, light of any chromaticity located on the straight line connecting the chromaticity coordinates corresponding to the above two color temperatures can be emitted from the light-emitting device 1.

[0096] As shown in FIG. 4C, both the second light-transmitting portion 72 and the third light-transmitting portion 73 include the phosphor 1. In this case, by changing the content of the phosphor 1 in the second light-transmitting portion 72 and the third light-transmitting portion 73, a light-emitting device 1 capable of emitting light with a wide range of chromaticities can be realized.

[0097] Note that Examples 1 to 3 are merely illustrative, and the types and combinations of phosphors included in each light-transmitting portion of the light-transmitting member 70 of the light-emitting device 1 are not limited to Examples 1 to 3.

[0098] [Method for manufacturing a light-emitting device] An example of a method for manufacturing the light-emitting device 1 will be described.

[0099] (Lead frame preparation step) The lead frame preparation step is a step of preparing a lead frame 20 having a first lead 21, a second lead 22, a third lead 23, and a fourth lead 24. The lead frame 20 can be formed by performing etching or pressing on a thin metal plate. At this time, a groove 20x can be formed simultaneously with the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24. In the lead frame 20, if necessary, a plating layer may be formed on the surface by electroless plating or electrolytic plating. Further, the above-described protective film may be formed so as to cover the plating layer.

[0100] (Resin molded body forming step) The resin molded body forming step is a step of forming a resin molded body 30 that fixes and holds the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24. In this step, for example, the lead frame 20 having the first lead 21, the second lead 22, the third lead 23, and the fourth lead 24 is placed in a mold for package manufacturing, and resin is injected into the mold to cure the resin. Thereby, the package 10 including the lead frame 20 and the resin molded body 30 is completed.

[0101] (Light-emitting element mounting step) The light-emitting element mounting step is a step of mounting a first light-emitting element 41 on the first lead 21 and mounting a second light-emitting element 42 on the second lead 22. In this step, for example, the first light-emitting element 41 and the second light-emitting element 42 are face-up mounted on the first lead 21 and the second lead 22 that are exposed on the bottom surface of the recess 30x with the electrode formation surface as the main light extraction surface and the surface opposite to the electrode formation surface as the mounting surface. If necessary, in this step, a first protection element 51 and a second protection element 52 are respectively mounted on the third lead 23 and the fourth lead 24 that are exposed on the bottom surface of the recess 30x.

[0102] (Wire connection process) The wire connection process is a process of forming wires 60 that electrically connect the first light-emitting element 41 and the second light-emitting element 42 to necessary locations on the lead frame 20. In this process, for example, a wire 60 that electrically connects one electrode of the first light-emitting element 41 and the first lead 21, and a wire 60 that electrically connects the other electrode of the first light-emitting element 41 and the third lead 23 are formed. Also, a wire 60 that electrically connects one electrode of the second light-emitting element 42 and the second lead 22, and a wire 60 that electrically connects the other electrode of the second light-emitting element 42 and the fourth lead 24 are formed. Note that when the first light-emitting element and / or the second light-emitting element is face-down mounted, the wire connection process may not be necessary.

[0103] (Fourth light-transmitting part and fifth light-transmitting part arrangement process) The fourth light-transmitting part and fifth light-transmitting part arrangement process is a process of arranging the fourth light-transmitting part 74 on the upper surface of the first light-emitting element 41 and arranging the fifth light-transmitting part 75 on the upper surface of the second light-emitting element 42. In this process, for example, resin that becomes the fourth light-transmitting part 74 is arranged on the upper surface of the first light-emitting element 41 by printing, potting, spraying, etc. Then, for example, the resin is cured at a temperature of 120°C or higher and 200°C or lower to form the fourth light-transmitting part 74. Similarly, the fifth light-transmitting part 75 is arranged on the upper surface of the second light-emitting element 42. Alternatively, the fourth light-transmitting part 74 and the fifth light-transmitting part 75 may be arranged by attaching a sheet-like or block-like resin member to the upper surface of the light-emitting element with an adhesive or the like. Also, when the fourth light-transmitting part 74 includes a fourth wavelength conversion member, it may be arranged, for example, by electrophoresis deposition method or the like. The same applies when the fifth light-transmitting part 75 includes a fifth wavelength conversion member.

[0104] Note that in this process, either the fourth light-transmitting part 74 or the fifth light-transmitting part 75 may be arranged first, or they may be arranged simultaneously. This process can be provided as necessary.

[0105] (First light-transmitting part arrangement process) The first light-transmitting part arranging step is a step of arranging the first light-transmitting part 71 so as to cover at least a part of the side surface of the first light-emitting element 41. Similar to the fourth and fifth light-transmitting parts, the first light-transmitting part 71 can be arranged by arranging resin at a predetermined position and heating the resin to cure it.

[0106] (Second light-transmitting part arranging step) The second light-transmitting part arranging step is a step of arranging the second light-transmitting part 72 so as to cover at least a part of the side surface of the second light-emitting element 42. Similar to the fourth and fifth light-transmitting parts, the second light-transmitting part 72 can be arranged by arranging resin at a predetermined position and heating the resin to cure it.

[0107] Note that either the first light-transmitting part 71 or the second light-transmitting part 72 may be arranged first, or they may be arranged simultaneously.

[0108] (Third light-transmitting part arranging step) The third light-transmitting part arranging step is a step of arranging the third light-transmitting part 73 above the first light-emitting element 41, the second light-emitting element 42, the first light-transmitting part 71, and the second light-transmitting part 72. Similar to the fourth and fifth light-transmitting parts, the third light-transmitting part 73 can be arranged by arranging resin at a predetermined position and heating the resin to cure it.

[0109] Note that in the manufacturing method of the light-emitting device 1, within a range that does not adversely affect the above-mentioned respective steps, other steps may be included between or before and after each step. For example, it may include a foreign matter removing step for removing foreign matter mixed in during manufacturing.

[0110] Also, in the manufacturing method of the light-emitting device 1, the order of some steps is not limited and may be reversed.

[0111] The lead frame preparation step and / or the resin molded body forming step, etc. may be carried out by itself, or a lead frame or the like with a groove formed by transfer including purchase may be prepared.

[0112] (Modification 1) FIG. 5 is a schematic cross-sectional view illustrating a light-emitting device according to Modification 1 of the first embodiment. FIG. 5 shows a first cross-section perpendicular to the upper surface of the first light-emitting element through the first light-emitting element and the second light-emitting element.

[0113] The light-emitting device 1A shown in FIG. 5 is different from the light-emitting device 1 in that the light-transmitting member 70 is replaced with a light-transmitting member 70A. In the cross-section of FIG. 5, the third light-transmitting portion 73 of the light-transmitting member 70A includes a diffusion portion 73a and a light-transmitting portion 73b located above the diffusion portion 73a. The diffusion portion 73a is a portion where the third wavelength conversion member included in the third light-transmitting portion 73 is unevenly distributed. That is, in the third light-transmitting portion 73, almost all of the third wavelength conversion members are present within the diffusion portion 73a. Within the diffusion portion 73a, the third wavelength conversion members can be dispersed almost uniformly. The third wavelength conversion members may not be present at all in the light-transmitting portion 73b, or a very small proportion of the third wavelength conversion members may be present with respect to the diffusion portion 73a. For example, in the cross-section of FIG. 5, the ratio of the area of the third wavelength conversion members located in the diffusion portion 73a to the area of the diffusion portion 73a is 5 times or more the ratio of the area of the third wavelength conversion members located in the light-transmitting portion 73b to the area of the light-transmitting portion 73b.

[0114] Note that the shape of the boundary between the diffusion portion 73a and the light-transmitting portion 73b shown in FIG. 5 is an example and is not limited thereto.

[0115] By providing the diffusion portion 73a in the third light-transmitting portion 73, the third wavelength conversion members can be arranged close to the first light-emitting element 41 and the second light-emitting element 42. Thereby, the light from the first light-emitting element 41 and the second light-emitting element 42 can be efficiently wavelength-converted by the third wavelength conversion members.

[0116] In the diffusion portion 73a, the maximum length L4 in the vertical direction of the portion located above the wall portion 33 is preferably longer than the maximum length L5 in the vertical direction of the portion located above the first light-emitting element 41 and the maximum length L6 in the vertical direction of the portion located above the second light-emitting element 42. By thickening the diffusion portion 73a located above the wall portion 33, the light emitted from the first light-emitting element 41 and the light emitted from the second light-emitting element 42 are more likely to mix above the wall portion 33, and the color mixing property above the wall portion 33 is improved.

[0117] To provide the diffusion portion 73a and the light-transmitting portion 73b in the third light-transmitting portion 73, in the step of arranging the third light-transmitting portion 73, an uncured resin containing the third wavelength conversion member may be arranged inside the recess 30x, and the third wavelength conversion member may be settled on the sides of the first light-emitting element 41 and the second light-emitting element 42 within the recess 30x. For example, when selecting phosphor particles having a specific gravity greater than that of the uncured resin as the third wavelength conversion member, the phosphor particles can be settled before curing the uncured resin. In this case, the portion where the settled phosphor particles are unevenly distributed becomes the diffusion portion 73a, and the portion where almost no phosphor particles are present above it becomes the light-transmitting portion 73b.

[0118] (Modification 2) FIG. 6A is a schematic top view illustrating a light-emitting device according to Modification 2 of the first embodiment. FIG. 6B is a schematic cross-sectional view taken along line VIB-VIB of FIG. 6A. FIG. 6B shows a first cross-section perpendicular to the upper surface of the first light-emitting element passing through the first light-emitting element and the second light-emitting element.

[0119] The light-emitting device 1B shown in FIGS. 6A and 6B is different from the light-emitting device 1 in that the light-transmitting member 70 is replaced with a light-transmitting member 70B. In the light-transmitting member 70B, the first light-transmitting portion 71 and the second light-transmitting portion 72 are in contact with each other in the region B above the wall portion 33. According to such a configuration, the light emitted from the first light-emitting element 41 and the light emitted from the second light-emitting element 42 are more likely to mix above the wall portion 33, and the color mixing property above the wall portion 33 is improved.

[0120] In the cross section of FIG. 6B, with respect to the upper surface of the lead frame 20, it is preferable that the height H1 (maximum height) of the portion where the first light-transmitting portion 71 and the second light-transmitting portion 72 are in contact is lower than the height H2 of the first light-emitting element 41 and the second light-emitting element 42. By doing so, the light from the first light-emitting element 41 and / or the second light-emitting element 42 is likely to hit the portion where the first light-transmitting portion 71 and the second light-transmitting portion 72 are in contact, so that the color mixing property of the light-emitting device 1B is likely to be improved. When the heights of the first light-emitting element 41 and the second light-emitting element 42 are different, it is preferable that the height H1 is even lower than the lower one of the heights of the first light-emitting element 41 and the second light-emitting element 42.

[0121] To make the first light-transmitting portion 71 and the second light-transmitting portion 72 in contact with each other in region B, first, in the step of arranging the first light-transmitting portion 71, an uncured first resin containing a first wavelength conversion member is arranged so as to cover a part or all of the upper surface of the wall portion 33. Then, the uncured first resin is cured to form the first light-transmitting portion 71. Thereafter, in the step of arranging the second light-transmitting portion 72, an uncured second resin containing a second wavelength conversion member is arranged so as to cover the first light-transmitting portion 71 located on the upper surface of the wall portion 33. Then, the uncured second resin is cured to form the second light-transmitting portion 72.

[0122] Note that in region B, the Z-direction positional relationship between the first light-transmitting portion 71 and the second light-transmitting portion 72 may be opposite to that in FIG. 6B. In this case, first, the second light-transmitting portion 72 may be arranged, and then the first light-transmitting portion 71 may be arranged.

[0123] Region B may exist throughout the longitudinal direction (Y direction) of the wall portion 33 or may exist partially. As shown in FIG. 6A, it is preferable that Region B exists at three locations in the wall portion 33, namely, at both longitudinal ends and at the portion sandwiched between the first light-emitting element 41 and the second light-emitting element 42 in plan view. That is, between one end of both longitudinal ends and the portion sandwiched between the first light-emitting element 41 and the second light-emitting element 42 in plan view, it is preferable that the upper surface of the wall portion is exposed from the first light-transmitting portion 71 and the second light-transmitting portion 72. By doing so, the light from the first light-emitting element 41 is less likely to hit the second light-transmitting portion, and the light from the second light-emitting element 42 is less likely to hit the first light-transmitting portion 71, compared to the case where the entire upper surface of the wall portion is covered by the first light-transmitting portion and the second light-transmitting portion. As a result, it becomes easier to increase the difference between the chromaticity when only the first light-emitting element 41 emits light and the chromaticity when only the second light-emitting element 42 emits light. Similarly, between the other end of both longitudinal ends and the portion sandwiched between the first light-emitting element 41 and the second light-emitting element 42 in plan view, it is preferable that the upper surface of the wall portion is exposed from the first light-transmitting portion 71 and the second light-transmitting portion 72. As shown in FIG. 6A, the portion of the upper surface of the wall portion exposed from the first light-transmitting portion 71 and the second light-transmitting portion 72 is sandwiched by the portion where the first light-transmitting portion 71 and the second light-transmitting portion 72 are in contact with each other above the wall portion 33, whereby the color unevenness of the light-emitting device 1B can be made less noticeable.

[0124] At both longitudinal ends of the wall portion 33, the first light-transmitting portion 71 and / or the second light-transmitting portion 72 can easily cross over the wall portion 33 along the inner surface of the frame portion 32. Also, in the portion sandwiched between the first light-emitting element 41 and the second light-emitting element 42 in plan view, since the height of the wall portion 33 is lower than the heights of the first light-emitting element 41 and the second light-emitting element 42, the first light-transmitting portion 71 and / or the second light-transmitting portion 72 can easily cross over the wall portion 33. In addition, when Region B exists in the portion of the wall portion 33 sandwiched between the first light-emitting element 41 and the second light-emitting element 42 in plan view, it may exist throughout the entire portion sandwiched between the first light-emitting element 41 and the second light-emitting element 42 in plan view or may exist partially.

[0125] (Modification 3) FIG. 7 is a schematic cross-sectional view illustrating a light-emitting device according to Modification 3 of the first embodiment. FIG. 7 shows a first cross-section perpendicular to the upper surface of the first light-emitting element through the first light-emitting element and the second light-emitting element.

[0126] The light-emitting device 1C shown in FIG. 7 is different from the light-emitting device 1 in that the light-transmitting member 70 is replaced with the light-transmitting member 70C. The light-transmitting member 70C further includes a sixth light-transmitting portion 76 in which the first wavelength-converting member and the second wavelength-converting member are mixed above the wall portion 33. The sixth light-transmitting portion 76 can be arranged so as to be in contact with the upper surface of the wall portion 33. According to such a configuration, the light emitted from the first light-emitting element 41 and the light emitted from the second light-emitting element 42 are more likely to be mixed above the wall portion 33 than in the case of Modification 2, and the color mixing property above the wall portion 33 is further improved.

[0127] To provide the sixth light-transmitting portion 76, first, in the step of arranging the first light-transmitting portion 71, an uncured first resin containing a first wavelength-converting member is arranged so as to cover a part or all of the upper surface of the wall portion 33. Next, in the step of arranging the second light-transmitting portion 72, an uncured second resin is arranged so as to cover the first resin located on the upper surface of the wall portion 33. The uncured first resin and the uncured second resin are mixed above the wall portion 33 to form a region in which the first wavelength-converting member and the second wavelength-converting member are mixed. Then, by curing the uncured first resin and the uncured second resin simultaneously, the sixth light-transmitting portion 76 in which the first wavelength-converting member and the second wavelength-converting member are mixed is arranged on the wall portion 33.

[0128] Note that the order of arranging the uncured first resin containing the first wavelength-converting member and the uncured second resin containing the second wavelength-converting member may be opposite to the above.

[0129] The preferred embodiments have been described in detail above. However, 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 described in the claims.

[0130] In addition to the above embodiments, the following supplementary notes are further disclosed. (Appendix 1) A first light-emitting element and a second light-emitting element that can be independently driven, A wall portion located between the first light-emitting element and the second light-emitting element in a plan view, A light-transmitting member that transmits light from the first light-emitting element and the second light-emitting element, comprising: The light-transmitting member, A first light-transmitting portion that covers a side surface of the first light-emitting element and includes a first wavelength conversion member, A second light-transmitting portion that covers a side surface of the second light-emitting element and includes a second wavelength conversion member, A third light-transmitting portion located above the first light-emitting element, the second light-emitting element, the first light-transmitting portion, and the second light-transmitting portion, including: The height of the wall portion is lower than the heights of the first light-emitting element and the second light-emitting element, A light-emitting device, wherein a peak emission wavelength of the first wavelength conversion member is longer than a peak emission wavelength of the second wavelength conversion member. (Appendix 2) The third light-transmitting portion includes a third wavelength conversion member, The light-emitting device according to Appendix 1, wherein a peak emission wavelength of the third wavelength conversion member is shorter than a peak emission wavelength of the first wavelength conversion member and longer than a peak emission wavelength of the second wavelength conversion member. (Appendix 3) The light-transmitting member, Further includes a fourth light-transmitting portion that covers an upper surface of the first light-emitting element and includes a fourth wavelength conversion member, The light-emitting device according to Appendix 2, wherein a peak emission wavelength of the fourth wavelength conversion member is longer than a peak emission wavelength of the third wavelength conversion member. (Appendix 4) The light-transmitting member, Further includes a fifth light-transmitting portion that covers an upper surface of the second light-emitting element and includes a fifth wavelength conversion member, The light-emitting device according to Appendix 2 or 3, wherein a peak emission wavelength of the fifth wavelength conversion member is shorter than a peak emission wavelength of the third wavelength conversion member. (Appendix 5) In a first cross-section perpendicular to the upper surface of the first light-emitting element passing through the first light-emitting element and the second light-emitting element, In the light-emitting device according to any one of Appendices 1 to 4, the maximum length in the vertical direction of the third light-transmitting portion located above the wall portion is longer than the maximum length in the vertical direction of the third light-transmitting portion located above the first light-emitting element and the maximum length in the vertical direction of the third light-transmitting portion located above the second light-emitting element. (Appendix 6) In a first cross-section perpendicular to the upper surface of the first light-emitting element passing through the first light-emitting element and the second light-emitting element, the third light-transmitting portion includes a diffusing portion and a light-transmitting portion located above the diffusing portion. In the light-emitting device according to any one of Appendices 1 to 5, in the diffusing portion, the maximum length in the vertical direction of the portion located above the wall portion is longer than the maximum length in the vertical direction of the portion located above the first light-emitting element and the maximum length in the vertical direction of the portion located above the second light-emitting element. (Appendix 7) In the light-emitting device according to any one of Appendices 1 to 6, the first light-transmitting portion and the second light-transmitting portion are in contact with each other above the wall portion. (Appendix 8) In a first cross-section perpendicular to the upper surface of the first light-emitting element passing through the first light-emitting element and the second light-emitting element, In the light-emitting device according to Appendix 7, the height of the portion where the first light-transmitting portion and the second light-transmitting portion are in contact with each other is lower than the heights of the first light-emitting element and the second light-emitting element. (Appendix 9) The light-transmissive member In the light-emitting device according to any one of Appendices 1 to 6, the light-transmissive member further includes a sixth light-transmitting portion above the wall portion where the first wavelength-converting member and the second wavelength-converting member are mixed. (Appendix 10) In the light-emitting device according to any one of Appendices 1 to 9, the emission peak wavelength of the second light-emitting element is equal to or less than the emission peak wavelength of the first light-emitting element. (Appendix 11) In the light-emitting device according to any one of Appendices 1 to 10, the height of the second light-emitting element is lower than the height of the first light-emitting element.

Description of Reference Numerals

[0131] 1,1A,1B,1C light-emitting device 10 package 20 lead frame 20x groove 21 first lead 22 second lead 23 third lead 24 fourth lead 30 resin molded body 30x recess 31 bottom part 32 frame part 33 wall part 41 first light-emitting element 42 second light-emitting element 51 first protective element 52 second protective element 60 wire 70,70A.70B,70C light-transmissive member 71 first light-transmissive part 72 second light-transmissive part 73 third light-transmissive part 73a diffusion part 73b light-transmissive part 74 fourth light-transmissive part 75 fifth light-transmissive part 76 sixth light-transmissive part

Claims

1. A first light-emitting element and a second light-emitting element that can be independently driven, A wall portion located between the first light-emitting element and the second light-emitting element in a plan view, A light-transmissive member that transmits light from the first light-emitting element and the second light-emitting element, comprising: The light-transmissive member, A first light-transmissive portion that covers a side surface of the first light-emitting element and includes a first wavelength conversion member, A second light-transmissive portion that covers a side surface of the second light-emitting element and includes a second wavelength conversion member, A third light-transmissive portion located above the first light-emitting element, the second light-emitting element, the first light-transmissive portion, and the second light-transmissive portion, The height of the wall portion is lower than the heights of the first light-emitting element and the second light-emitting element, A light-emitting device in which a peak emission wavelength of the first wavelength conversion member is longer than a peak emission wavelength of the second wavelength conversion member.

2. The third light-transmissive portion includes a third wavelength conversion member, The light-emitting device according to claim 1, wherein a peak emission wavelength of the third wavelength conversion member is shorter than a peak emission wavelength of the first wavelength conversion member and longer than a peak emission wavelength of the second wavelength conversion member.

3. The light-transmissive member, Further includes a fourth light-transmissive portion that covers an upper surface of the first light-emitting element and includes a fourth wavelength conversion member, The light-emitting device according to claim 2, wherein a peak emission wavelength of the fourth wavelength conversion member is longer than a peak emission wavelength of the third wavelength conversion member.

4. The light-transmissive member, Further includes a fifth light-transmissive portion that covers an upper surface of the second light-emitting element and includes a fifth wavelength conversion member, The light-emitting device according to claim 2, wherein a peak emission wavelength of the fifth wavelength conversion member is shorter than a peak emission wavelength of the third wavelength conversion member.

5. In a first cross-section perpendicular to the upper surface of the first light-emitting element passing through the first light-emitting element and the second light-emitting element, The maximum length in the vertical direction of the third light-transmissive portion located above the wall portion is longer than the maximum length in the vertical direction of the third light-transmissive portion located above the first light-emitting element and the maximum length in the vertical direction of the third light-transmissive portion located above the second light-emitting element. The light-emitting device according to any one of claims 1 to 4.

6. In a first cross-section perpendicular to the upper surface of the first light-emitting element passing through the first light-emitting element and the second light-emitting element, the third light-transmissive portion includes a diffusing portion and a light-transmissive portion located above the diffusing portion. In the diffusion portion, the maximum length in the vertical direction of the portion located above the wall portion is longer than the maximum length in the vertical direction of the portion located above the first light-emitting element and the maximum length in the vertical direction of the portion located above the second light-emitting element. The light-emitting device according to any one of claims 1 to 4.

7. The light-emitting device according to any one of claims 1 to 4, wherein the first light-transmitting portion and the second light-transmitting portion are in contact with each other above the wall portion.

8. In a first cross-section perpendicular to the upper surface of the first light-emitting element through the first light-emitting element and the second light-emitting element, The height of the portion where the first light-transmitting portion and the second light-transmitting portion are in contact with each other is lower than the heights of the first light-emitting element and the second light-emitting element. The light-emitting device according to claim 7.

9. The light-transmissive member The light-emitting device according to any one of claims 1 to 4, further including a sixth light-transmitting portion above the wall portion where the first wavelength-converting member and the second wavelength-converting member are mixed.

10. The light-emitting peak wavelength of the second light-emitting element is equal to or less than the light-emitting peak wavelength of the first light-emitting element. The light-emitting device according to any one of claims 1 to 4.

11. The height of the second light-emitting element is lower than the height of the first light-emitting element. The light-emitting device according to any one of claims 1 to 4.

Images