Light-emitting device

Abstract

To improve the light extraction efficiency of a light-emitting device that can emit light of a desired chromaticity.SOLUTION: A light-emitting device includes a light-emitting element that emits first light, a first wavelength conversion member that is arranged on the light-emitting element and has a bottom surface bonded to the light-emitting element, an upper surface opposite the bottom surface, and a side surface connected to the upper surface, and that is excited by the first light and emits second light, a second wavelength conversion member that exposes the top surface of the first wavelength conversion member, covers the side surface, and has a sloping surface from the side surface to the outside, and emits third light when excited by at least one of the first light and the second light, and a first light reflective member covering the sloping surface.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] In recent years, there has been an increasing demand for light emitting devices that emit white light and that emit light in a desired chromaticity range. For example, the light emitting device described in Patent Document 1 adjusts the color temperature of the emitted light by a phosphor layer that covers the side surface of the light emitting element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-082027 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the light emitting device described in Patent Document 1 still has room for improvement in terms of light extraction efficiency.

[0005] An object of the present disclosure is to improve the light extraction efficiency in a light emitting device capable of emitting light in a desired chromaticity range. [Means for solving the problem]

[0006] A light emitting device according to one embodiment of the present disclosure includes a light emitting element that emits a first light, a first wavelength conversion member that is arranged on the light emitting element and has a lower surface joined to the light emitting element, an upper surface opposite the lower surface, and a side surface connected to the upper surface, and is excited by the first light to emit a second light, a second wavelength conversion member that exposes the upper surface of the first wavelength conversion member, covers the side surface, and has an inclined surface extending outward from the side surface, the second wavelength conversion member that is excited by at least one of the first light and the second light to emit a third light, and a first light reflective member that covers the inclined surface. Effect of the Invention

[0007] According to an embodiment of the present disclosure, it is possible to improve the light extraction efficiency in a light emitting device capable of emitting light in a desired chromaticity range. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic top view of a light emitting device according to a first embodiment of the present disclosure. [Diagram 2] 2 is a schematic cross-sectional view of the light-emitting device shown in FIG. 1 taken along line II-II. [Diagram 3] 3 is a schematic cross-sectional view of the light-emitting device shown in FIG. 1 taken along line III-III. [Figure 4] 2 is a diagram showing a schematic diagram of how light travels in the light emitting device shown in FIG. [Figure 5A] 1 is a schematic cross-sectional view illustrating a step of a method for manufacturing the light emitting device according to Embodiment 1. FIG. [Figure 5B] 1 is a schematic top view illustrating a step of a method for manufacturing the light emitting device according to Embodiment 1. FIG. [Figure 5C] 1 is a schematic cross-sectional view illustrating a step of a method for manufacturing the light emitting device according to Embodiment 1. FIG. [Figure 5D] 1 is a schematic cross-sectional view illustrating a step of a method for manufacturing the light emitting device according to Embodiment 1. FIG. [Figure 5E] 1 is a schematic cross-sectional view illustrating a step of a method for manufacturing the light emitting device according to Embodiment 1. FIG. [Figure 5F] 1 is a schematic cross-sectional view illustrating a step of a method for manufacturing the light emitting device according to Embodiment 1. FIG. [Figure 5G] 1 is a schematic cross-sectional view illustrating a step of a method for manufacturing the light emitting device according to Embodiment 1. FIG. [Figure 5H] 1 is a schematic cross-sectional view illustrating a step of a method for manufacturing the light emitting device according to Embodiment 1. FIG. [Figure 6] FIG. 4 is a schematic cross-sectional view of a light emitting device according to a second embodiment of the present disclosure. [Figure 7] 1 is a schematic cross-sectional view of a light-emitting device according to an embodiment of the present disclosure. [Figure 8]FIG. 11 is a schematic cross-sectional view of a light emitting device according to a third embodiment of the present disclosure. [Figure 9] 1 shows a graph of chromaticity coordinates in which the chromaticity of light emitted by the light emitting device of the example and the chromaticity of light emitted by the light emitting device of the comparative example are plotted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments and examples for carrying out the present disclosure will be described with reference to the drawings. Note that the light emitting device described below is intended to embody the technical idea of ​​the present disclosure, and unless otherwise specified, the present disclosure is not limited to the following. In each drawing, the same reference numerals may be used for components having the same function. In consideration of the explanation or ease of understanding of the main points, the embodiments and examples may be shown separately for convenience, but partial replacement or combination of the configurations shown in different embodiments and examples is possible. In the embodiments and examples described below, the description of matters common to the above may be omitted, and only the differences may be described. In particular, similar effects due to similar configurations will not be mentioned in each embodiment or example. The size and positional relationship of the components shown in each drawing may be exaggerated to clarify the explanation. In this specification, the lower part of the light emitting device is the side on which the substrate 50 is disposed, and the upper part of the light emitting device is the side opposite the lower part. In addition, in this specification, the inside of the light emitting device is the center side of the light emitting device, and the outside of the light emitting device is the outer surface side of the light emitting device.

[0010] Embodiment 1. Embodiment 1 1 to 3, the light emitting device 100 according to the first embodiment includes a light emitting element 1 that emits a first light, a first wavelength conversion member 10 that is disposed on the light emitting element 1 and has a bottom surface 12 that is bonded to the light emitting element 1, a top surface 11 opposite to the bottom surface 12, and a side surface 13 that is continuous with the top surface 11, and that is excited by the first light to emit a second light, a second wavelength conversion member 20 that exposes the top surface 11 of the first wavelength conversion member 10, covers the side surface 13, and has an inclined surface 22 that faces outward from the side surface 13, and a first light reflective member 30 that covers the inclined surface 22. The second wavelength conversion member 20 is excited by at least one of the first light and the second light to emit a third light. Furthermore, the light emitting device 100 may include a substrate 50 on which the light emitting element 1 is placed, and a second light reflective member 40 disposed between the side surface 3 of the light emitting element 1 and the second wavelength conversion member 20. Furthermore, on the substrate 50, a first convex portion 91, a second convex portion 92, and a protective element 80 may be arranged to support the first light reflective member 30 and cover part of the side surface of the first light reflective member 30.

[0011] (substrate) The substrate 50 is a member on which the light-emitting element 1 is mounted, and includes wiring 56 for supplying power from the outside to the light-emitting element 1. As shown in Figures 1 to 3, the substrate 50 includes the wiring 56 and a base material 55 that supports the wiring 56. The wiring 56 is disposed on at least the upper surface of the base material 55.

[0012] The base material 55 has, for example, a substantially rectangular parallelepiped shape and includes four side surfaces that are continuous with the upper surface on which the light emitting element is placed. The four side surfaces are a first side surface 51 and a second side surface 52 that face each other, and a third side surface 53 and a fourth side surface 54 that connect the first side surface 51 and the second side surface 52 and face each other. It is preferable to use a material that is difficult for light from the light-emitting element and external light to pass through as the base material 55. Examples of the material include ceramics such as aluminum oxide, aluminum nitride, and silicon nitride, resins such as phenol resin, epoxy resin, polyimide resin, BT resin, and polyphthalamide, semiconductors such as silicon, and single materials such as metals such as copper and aluminum, and composite materials thereof. Examples of the wiring 56 include metals such as iron, copper, nickel, aluminum, gold, silver, platinum, titanium, tungsten, and palladium, or alloys containing at least one of these metals. The substrate 50 may have a recess on the upper surface, and the light emitting device 100 may have a structure in which the light emitting element 1 is placed on the bottom of the recess of the substrate 50. The light emitting device 100 may also have a structure without the substrate 50. For example, the light emitting device may have a structure in which a metal member exposed from a covering member such as the second wavelength conversion member 20 that covers the light emitting element 1 is provided as an electrode of the light emitting device.

[0013] The wiring 56 is electrically connected to the electrode 6 of the light-emitting element 1. The wiring 56 and the electrode 6 can be connected, for example, via a conductive bonding member 70. Examples of the bonding member 70 include eutectic solder, conductive paste, and bumps. The wiring 56 includes an anode-side wiring 56 and a cathode-side wiring 56. As shown in FIG. 1 and FIG. 3, a part of the anode-side wiring 56 and a part of the cathode-side wiring 56 are exposed on the surface of the light-emitting device 100 and function as external electrodes of the light-emitting device 100.

[0014] (Light emitting element) The light emitting element 1 emits a first light. 2 and 3, the light-emitting element 1 includes a semiconductor stack 5 and an electrode 6. The light-emitting element 1 may include a support substrate 7 that supports the semiconductor stack 5.

[0015] The semiconductor stack 5 includes, for example, a first semiconductor layer, a second semiconductor layer, and a light emitting layer disposed between the first semiconductor layer and the second semiconductor layer. Examples of the semiconductor laminate 5 include various semiconductors such as III-V group compound semiconductors and II-VI group compound semiconductors.X Al Y Ga 1-X-Y Examples of the nitride-based semiconductor materials include InN, AlN, GaN, InGaN, AlGaN, InGaAlN, etc. (0≦X, 0≦Y, X+Y≦1). The thickness and layer structure of each layer may be those known in the art. The semiconductor laminate 5 emits a first light from the light-emitting layer. The peak wavelength of the first light is, for example, in the range of 260 nm to 630 nm. The first light is, for example, blue light.

[0016] The light-emitting element 1 may have one semiconductor laminate 5 on one support substrate, or may have multiple semiconductor laminates 5 on one support substrate. Furthermore, one semiconductor laminate 5 may have only one light-emitting layer, or may have multiple light-emitting layers. The structure of the semiconductor laminate 5 having multiple light-emitting layers may be a structure including multiple light-emitting layers between one first semiconductor layer and one second semiconductor layer, or a structure including a first semiconductor layer, a light-emitting layer, and a second semiconductor layer in that order may be repeated multiple times.

[0017] The light-emitting element 1 includes an electrode 6 on a semiconductor laminate 5. The electrode 6 includes a first electrode connected to the first semiconductor layer and a second electrode connected to the second semiconductor layer. The first electrode and the second electrode may be disposed on different surfaces of the semiconductor laminate 5 or may be disposed on the same surface.

[0018] In the light emitting device 100, the shape of the light emitting element 1 when viewed from above is, for example, a square or a rectangle. The shape of the light emitting element 1 when viewed from above may also be a polygon such as a triangle or a hexagon.

[0019] (First wavelength conversion member) As shown in FIGS. 2 and 3, the first wavelength converting member 10 is disposed on the light emitting element 1. As shown in FIG. The first wavelength conversion member 10 includes a bottom surface 12 bonded to the light emitting element 1, a top surface 11 opposite to the bottom surface 12, and a side surface 13 continuous with the top surface 11. The bottom surface 12 of the first wavelength conversion member 10 is bonded to the top surface 2 of the light emitting element 1. The first wavelength conversion member 10 is excited by the first light emitted by the light emitting element 1 and emits a second light. The first wavelength conversion member 10 is, for example, a member having a flat plate shape. The top surface 11 and the bottom surface 12 are flat surfaces parallel to each other, and the top surface 11 is rectangular in shape as shown in FIG. 1. The lower surface 12 covers the entire upper surface 2 of the light-emitting element 1, as shown in FIGS. The side surface 13 includes a plurality of side surfaces. Specifically, the side surface 13 includes four side surfaces that are continuous with each side of the rectangular top surface 11. Here, each of the four side surfaces is a plane perpendicular to the top surface 11.

[0020] The above-mentioned shape of the first wavelength conversion member 10 is merely an example. For example, the first wavelength conversion member 10 may have an upper surface 11 and a lower surface 12 that are flat surfaces with the same area, or may have a shape in which one of the upper surface 11 and the lower surface 12 contains the other in a plan view. In this case, the first wavelength conversion member 10 may have a structure having a step between the upper surface 11 and the lower surface 12, or may have an inclined surface that slopes from the upper surface to the lower surface.

[0021] The first wavelength conversion member 10 can be bonded to the upper surface 2 of the light emitting element 1 via, for example, a light-transmitting bonding member. The first wavelength conversion member 10 and the light emitting element 1 may also be bonded directly without a bonding member. The upper surface 11 of the first wavelength conversion member 10 can be exposed from the first light reflective member 30 and form a part of the upper surface of the light emitting device 100. In this case, the upper surface 11 of the first wavelength conversion member 10 is the light emitting surface of the light emitting device 100.

[0022] The first wavelength conversion member 10 includes a phosphor that is excited by the first light emitted from the light emitting element 1 and emits the second light. The peak wavelength of the second light is longer than the peak wavelength of the first light. The peak wavelength of the second light is, for example, in the range of 520 nm to 560 nm. The second light is, for example, yellow-green to yellow light.

[0023] The first wavelength conversion member 10 includes, for example, a sintered body of a phosphor, or a material in which phosphor powder is contained in resin, glass, ceramic, or other inorganic substances. Further, as the first wavelength conversion member 10, a layer containing a phosphor may be disposed on the surface of a molded body of resin, glass, ceramic, or the like. Further, the first wavelength conversion member 10 may contain a filler such as a diffusing material to such an extent that it does not block light. As the diffusing material, for example, titanium oxide, silicon oxide, aluminum oxide, zinc oxide, or the like can be used. When resin is used as a binder for the phosphor and the diffusing material, as the resin, for example, resins such as epoxy resin, modified epoxy resin, silicone resin, modified silicone resin, acrylic resin, and fluororesin can be used. The first wavelength conversion member has light transmissivity, and the transmittance with respect to the first light emitted from the light emitting element 1, the wavelength-converted second light, and the third light is preferably 50% or more, and more preferably 70% or more.

[0024] As the phosphor contained in the first wavelength conversion member 10, one that can be excited by the first light emitted from the light emitting element 1 is used. For example, as the phosphor that emits green light, yttrium aluminum garnet-based phosphors (for example, Y3(Al,Ga)5O 12 :Ce), lutetium aluminum garnet-based phosphors (for example, Lu3(Al,Ga)5O 12 :Ce), terbium aluminum garnet-based phosphors (for example, Tb3(Al,Ga)5O 12 :Ce), silicate-based phosphors (for example, (Ba,Sr)2SiO4:Eu), chlorosilicate-based phosphors (for example, Ca8Mg(SiO4)4C l2 :Eu), β-sialon-based phosphors (for example, Si 6-z Al z O z N 8-z :Eu(0 < z < 4.2)), SGS-based phosphors (for example, SrGa2S4:Eu), and the like can be mentioned. As the phosphor that emits yellow light, α-sialon-based phosphors (for example, Mz(Si,Al) 12 (O,N) 16(However, 0 < z ≤ 2, and M includes Li, Mg, Ca, Y, and lanthanide elements excluding La and Ce, etc.). In addition, among the above-mentioned green-emitting phosphors, there are also yellow-emitting phosphors. For example, in the yttrium aluminum garnet-based phosphors, by substituting part of Y with Gd, the emission peak wavelength can be shifted to the longer wavelength side, enabling yellow emission. Also, among these, there are fluorescent substances capable of orange emission. Examples of the red-emitting phosphors include nitrogen-containing calcium aluminosilicate (CASN or SCASN) - based phosphors (e.g., (Sr,Ca)AlSiN3:Eu), BSESN - based phosphors (e.g., (Ba,Sr,Ca)2Si5N8:Eu), etc. In addition, manganese-activated fluoride-based phosphors (general formula (I) A2[M 1-a Mn a F6] - represented phosphors (wherein, in the above general formula (I), A is at least one selected from the group consisting of K, Li, Na, Rb, Cs, and NH4, M is at least one element selected from the group consisting of Group 4 elements and Group 14 elements, and a satisfies 0 < a < 0.2)) can be mentioned. Examples of this manganese-activated fluoride-based phosphor include KSF - based phosphors (e.g., K2SiF6:Mn), KSAF - based phosphors (e.g., K2Si 0.99 Al 0.01 F 5.99 :Mn), and MGF - based phosphors (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), etc.

[0025] The KSAF - based phosphor may have a composition represented by the following formula (I). M2[Si p Al q Mn r F s (I)

[0026] In formula (I), M represents an alkali metal and may contain at least K. Mn may be tetravalent Mn ions. p, q, r, and s may satisfy 0.9 ≦ p + q + r ≦ 1.1, 0 < q ≦ 0.1, 0 < r ≦ 0.2, 5.9 ≦ s ≦ 6.1. Preferably, 0.95 ≦ p + q + r ≦ 1.05 or 0.97 ≦ p + q + r ≦ 1.03, 0 < q ≦ 0.03, 0.002 ≦ q ≦ 0.02 or 0.003 ≦ q ≦ 0.015, 0.005 ≦ r ≦ 0.15, 0.01 ≦ r ≦ 0.12 or 0.015 ≦ r ≦ 0.1, 5.92 ≦ s ≦ 6.05 or 5.95 ≦ s ≦ 6.025. For example, K2[Si 0.946 Al 0.005 Mn 0.049 F 5.995 , K2[Si 0.942 Al 0.008 Mn 0.050 F 5.992 , K2[Si 0.939 Al 0.014 Mn 0.047 F 5.986 . According to such a KSAF-based phosphor, high luminance and red light emission with a narrow half-value width of the emission peak wavelength can be obtained.

[0027] Among them, as the phosphor contained in the first wavelength conversion member, as the yellow light-emitting phosphor, a yttrium-aluminum-garnet-based phosphor (for example, Y3(Al,Ga)5O 12 :Ce) in which part of Y is replaced by Gd can be preferably used. Thereby, the light-emitting device 100 can emit white light in which blue light as the first light and yellow light as the second light are mixed as the light emitted from the first wavelength conversion member.

[0028] (The second wavelength conversion member) The second wavelength conversion member 20 exposes the upper surface 11 of the first wavelength conversion member 10 and covers the side surface 13 of the first wavelength conversion member 10. The second wavelength conversion member 20 has an inclined surface (hereinafter referred to as the first inclined surface 22) facing outward from the side surface 13 of the first wavelength conversion member 10. The second wavelength conversion member 20 is excited by at least one of the first light and the second light and emits the third light.

[0029] The second wavelength conversion member 20 is excited by at least one of the first light emitted by the light emitting element 1 and the second light emitted by the first wavelength conversion member 10, and emits a third light. The peak wavelength of the third light is longer than the peak wavelength of the first light. Here, the peak wavelength of the third light is longer than the peak wavelength of the first light and the peak wavelength of the second light. The peak wavelength of the third light is, for example, 600 nm or more and 660 nm or less. The third light is, for example, orange to red light.

[0030] 2 and 3, the second wavelength conversion member 20 includes a first surface 21 in contact with the side surface of the first wavelength conversion member 10, and a first inclined surface 22 extending outward from an upper end of the first surface 21. The second wavelength conversion member 20 may further include a second inclined surface 23 extending outward from a lower end of the first surface 21. When the first wavelength conversion member 10 includes a plurality of side surfaces, the second wavelength conversion member 20 continuously covers the plurality of side surfaces of the first wavelength conversion member 10. In the light emitting device 100, the second wavelength conversion member 20 preferably continuously covers four side surfaces of the first wavelength conversion member 10, and more preferably covers the entire side surface 13 of the first wavelength conversion member 10. When the light emitting device 100 includes a second light reflective member 40 described later, the second wavelength conversion member 20 may cover at least a part of the upper region of each side surface 3 of the light emitting element 1 exposed from the second light reflective member 40. When the light emitting device 100 does not include a second light reflective member 40 described later, the second wavelength conversion member 20 preferably extends from the side surface of the first wavelength conversion member 10 to the side surface 3 of the light emitting element 1 and covers all of the side surfaces 3 of the light emitting element 1. The first inclined surface 22 is connected to the first surface 21. The upper end of the first inclined surface 22 is in contact with the side surface of the first wavelength conversion member 10, and the lower end is in contact with the upper surface of the substrate 50, for example. The second inclined surface 23 is located more inward than the first inclined surface 22, with its upper end in contact with the side surface of the first wavelength conversion member 10 or the side surface of the light emitting element 1, and its lower end in contact with the upper surface of the substrate 50, for example.

[0031] Each of the first inclined surface 22 and the second inclined surface 23 may be a flat surface or a curved surface. In particular, as shown in FIG. 2 and FIG. 3, the first inclined surface 22 is preferably a curved surface whose cross-sectional shape is a curved line that is convex from the outside to the inside of the light emitting device. Here, the first inclined surface is arranged as a cup-shaped curved surface that is a curved line that is convex toward the light emitting element 1 side in cross-sectional view. With such a shape, the light incident on the second wavelength conversion member 20 can be reflected, and the reflected light can proceed toward the first wavelength conversion member 10 side. In other words, it is possible to guide more light to the first wavelength conversion member 10, and the light extraction efficiency of the light emitting device 100 can be increased.

[0032] It is preferable that the first inclined surface 22 is entirely covered by the first light reflective member 30. The light reflecting function of the first light reflective member 30 makes it possible to guide more light to the first wavelength conversion member 10 side, thereby improving the light extraction efficiency of the light emitting device 100. The upper end of the first inclined surface 22 may be in contact with the upper end of the side surface 13 of the first wavelength conversion member 10 (in other words, the outer edge of the upper surface 11 of the first wavelength conversion member 10), or may be in contact below the upper end of the side surface 13 of the first wavelength conversion member 10. When the upper end of the first inclined surface 22 is in contact with the upper end of the side surface 13 of the first wavelength conversion member 10 (i.e., when the second wavelength conversion member 20 constitutes part of the upper surface of the light emitting device 100), the thickness of the second wavelength conversion member 20 exposed on the upper surface of the light emitting device 100 is preferably thin. For example, it is preferably 10 μm or less. This makes it possible to reduce the amount of light emitted from the second wavelength conversion member 20 to the outside without passing through the first wavelength conversion member 10, thereby suppressing unevenness in the emitted light color in the light emitting device 100. Furthermore, when the upper end of the first inclined surface 22 is in contact with a lower side than the upper end of the side surface 13 of the first wavelength conversion member 10 (that is, when the second wavelength conversion member 20A exposes the upper portion 13A of the side surface 13 of the first wavelength conversion member 10 as in the light emitting device 100A shown in FIG. 7), in the light emitting device 100A, the upper portion 13A of the side surface 13 of the first wavelength conversion member 10 exposed from the second wavelength conversion member 20A is preferably covered by the first light reflective member 30. This makes it difficult for the light emitted from the second wavelength conversion member 20 to be visually recognized from the outside via the first light reflective member 30, so that unevenness in the emitted light color in the light emitting device 100 can be suppressed.

[0033] The second wavelength conversion member 20 may be a resin containing a light-reflecting material and a phosphor. Specifically, a resin containing a light-reflecting material and a phosphor in a resin serving as a base material may be used. When the second wavelength conversion member 20 contains a light-reflecting material, the first light and the second light can be efficiently reflected. Furthermore, when the second wavelength conversion member 20 contains a phosphor, the light that has been transmitted without being reflected by the light-reflecting material can be wavelength-converted into a third light, which can be reflected by the first inclined surface 22 and / or the second inclined surface 23 and travel toward the first wavelength conversion member. When the light emitted from the light emitting device 100 contains the third light, the chromaticity of the light emitted from the light emitting device 100 can be adjusted. As the light reflective material contained in the second wavelength conversion member 20, titanium oxide, aluminum oxide, silicon oxide, zinc oxide, barium carbonate, barium sulfate, boron nitride, aluminum nitride, glass filler, or the like can be suitably used. As the resin for the base material, the same resin as the resin exemplified for the first wavelength conversion member 10 can be used. The phosphor contained in the second wavelength conversion member 20 is one that can be excited by at least one of the first light emitted by the light emitting element 1 and the second light emitted by the first wavelength conversion member 10. As the phosphor, the same phosphor as the above-mentioned phosphor can be used. Among them, as the phosphor contained in the second wavelength conversion member 20, a BSESN phosphor (for example, (Ba, Sr, Ca) 2 Si 5 N 8 :Eu) can be suitably used as a phosphor that emits orange light. In this manner, since the second wavelength conversion member 20 contains an orange-emitting phosphor, the light emitting device 100 can shift the chromaticity of white light obtained by mixing blue light and yellow light to the orange side.

[0034] The phosphor contained in the second wavelength conversion member 20 may be the same as the phosphor contained in the first wavelength conversion member 10. Even in this case, the chromaticity of the light emitted by the light emitting device 100 can be adjusted.

[0035] (First light reflective member) The first light reflective member 30 covers the first inclined surface 22 of the second wavelength conversion member 20. The first light reflective member 30 exposes the upper surface 11 of the first wavelength conversion member 10. On the upper surface of the light emitting device 100, the first light reflective member 30 is preferably disposed contiguous to the upper surface 11 of the first wavelength conversion member 10. The upper surface of the first light reflective member 30 is part of the upper surface of the light emitting device 100.

[0036] As shown in FIG. 1, the shape of the outer edge of the first light reflective member 30 in top view is, for example, substantially rectangular, and the first light reflective member 30 includes, for example, four side surfaces continuing to the upper surface. Two mutually opposing side surfaces 33, 34 of the first light reflective member 30 are part of the side surfaces of the light emitting device 100. As shown in FIG. 2, one side surface 33 of the two side surfaces 33, 34 is disposed substantially on the same plane as the third side surface 53 of the substrate 50. The other side surface 34 of the two side surfaces 33, 34 is disposed substantially on the same plane as the fourth side surface 54 of the substrate 50. The other mutually opposing side surfaces 31, 32 of the first light reflective member 30 are covered with a convex portion (a first convex portion 91 or a second convex portion 92) as shown in FIG. 3. Note that the light emitting device 100 does not need to include the first convex portion 91. In this case, the first light reflective member 30 has a side surface disposed substantially on the same plane as the first side surface 51 of the substrate 50.

[0037] The first light reflective member 30 may be, for example, a resin containing a light reflective substance. The light reflective substance may be the same as the materials exemplified for the second wavelength conversion member. The resin may be the same as the resin exemplified for the first wavelength conversion member 10. The first light reflective member 30 may contain a light absorbing substance such as carbon black or graphite. The first light reflective member 30 preferably has a reflectance of 60% or more with respect to the light emitted from the light emitting element 1, and more preferably 80% or more.

[0038] (Second light reflective member) The light emitting device 100 may include a second light reflective member 40 disposed between the side surface of the light emitting element 1 and the second wavelength conversion member 20. The second light reflective member 40 preferably covers the side surface 3 of the light emitting element 1. This allows the light emitted from the side surface 3 of the light emitting element 1 to be reflected and proceed toward the light emitting element 1. In addition, when the light emitting element 1 is placed on the substrate 50, the second light reflective member 40 preferably covers the space between the lower surface 4 of the light emitting element 1 and the upper surface of the substrate 50, and the side surface of the electrode 6 of the light emitting element 1. This allows the light emitted from the light emitting element 1 and directed downward to be reflected and proceed toward the light emitting element 1. Note that when the side surface of the light emitting element 1 is covered with a translucent bonding member, such as when the light emitting element 1 and the first wavelength conversion member 10 are bonded via a translucent bonding member, the second light reflective member 40 may cover the side surface 3 of the light emitting element 1 via the translucent bonding member. The second light reflective member 40 is preferably disposed as a fillet on the side surface 3 of the light emitting element 1. As a result, the second wavelength conversion member 20 covering the second light reflective member 40 can be provided with a second inclined surface 23 in contact with the second light reflective member 40. The second inclined surface 23 is preferably a curved surface whose cross-sectional shape is a curved line that is convex from the outside to the inside of the light emitting device. As a result, more light emitted from the side surface of the light emitting element 1 can be reflected toward the light emitting element 1. Note that the light that is not reflected by the second inclined surface 23 and enters the second wavelength conversion member 20 is reflected by the first inclined surface 22 and guided to the first wavelength conversion member 10 side, and can constitute a part of the emitted light of the light emitting device 100. As a result, the light extraction efficiency of the light emitting device 100 can be improved.

[0039] The second light reflective member 40 can be selected from the same materials as those constituting the first light reflective member 30. The materials constituting the first light reflective member 30 and the materials generating the second light reflective member 40 may be the same or different.

[0040] (Convex part) As shown in FIG. 3, the light emitting device 100 may include a convex portion that holds the first light reflective member. The convex portion includes a first convex portion 91 that covers one side surface of the first light reflective member 30, and a second convex portion 92 that covers one side surface opposite to the first side surface. The first convex portion 91 is disposed on the outer edge of the upper surface of the substrate 50 on the first side surface 51 side. The second convex portion 92 is disposed on the upper surface of the substrate 50 on the second side surface 52 side. The first light emitting element 1, the first wavelength conversion member 10, the second light reflective member 40, the second wavelength conversion member 20, the first light reflective member 30, and the protective element 80 are disposed in the region between the first convex portion 91 and the second convex portion 92. Hereinafter, the region where the first convex portion 91 and the second convex portion 92 are disposed and the region between the first convex portion 91 and the second convex portion 92 are referred to as a mounting region R1. A part of the wiring 56 is exposed in the region on the second side surface 52 side of the substrate 50 from the second convex portion 92. Hereinafter, this region will be referred to as the external connection region R2.

[0041] For example, a resin can be used for the first convex portion 91 and the second convex portion 92. The resin can be any of the above-mentioned resins. The resin constituting the convex portions may be a light-transmitting resin, or may be a white resin containing a light-reflecting material, a gray resin containing a light-absorbing material, a black resin, or the like.

[0042] (Protection element) The light emitting device 100 may further include a protective element 80. The protective element 80 is connected to the wiring 56 of the substrate 50 via a bonding member such as a bump. The surface of the protective element 80 is covered with one or more members selected from the first light reflective member 30, the second wavelength conversion member 20, and the second light reflective member 40. The protective element 80 is, for example, a Zener diode.

[0043] (How light travels) The way light travels in the light emitting device 100 will be described with reference to FIG. The first light (e.g., arrow A1) emitted from the upper surface 2 of the light-emitting element 1 is incident on the first wavelength conversion member 10. A part of the first light (e.g., arrow A2) emitted from the side surface 3 and lower surface 4 of the light-emitting element 1 is reflected by the side surface 3 and lower surface 4 of the light-emitting element 1, emitted from the upper surface 2 of the light-emitting element 1 (e.g., arrow A3), and incident on the first wavelength conversion member 10. A part of the light (e.g., arrow B5) incident on the first wavelength conversion member 10 is emitted to the outside from the upper surface of the first wavelength conversion member 10 (e.g., arrow C1). A part of the light emitted from the side surface 13 of the first wavelength conversion member 10 (for example, arrow B1) is reflected by the first surface 21 and / or the second wavelength conversion member 20 (for example, arrow B4) and emitted from the upper surface of the first wavelength conversion member 10 (for example, arrow C4). Another part is incident on the second wavelength conversion member 20 (for example, arrow D1). A portion of the first light and / or second light incident on the second wavelength conversion member 20 is converted into third light by the second wavelength conversion member 20. Another portion of the first light and / or second light incident on the second wavelength conversion member 20 is emitted from the second wavelength conversion member without being wavelength-converted into the third light. As a result, the light emitted from the second wavelength conversion member 20 can include the first light, the second light, and the third light. A part of the light emitted by the second wavelength conversion member 20 (for example, arrow D1) is reflected by the first inclined surface 22 and / or the first light reflective member 30. A part of the light reflected by the first inclined surface 22 and / or the first light reflective member 30 (for example, arrow D2) passes through the first surface 21, enters the first wavelength conversion member 10 (for example, arrow B2), and is emitted from the upper surface of the first wavelength conversion member 10 (for example, arrow C2). As a result, the light emitted from the upper surface of the first wavelength conversion member 10 can include the first light, the second light, and the third light. The light emitted from the upper surface of the first wavelength conversion member 10 constitutes the light emitted by the light emitting device 100.

[0044] The light emitted from the light emitting device 100 configured as described above includes the light that has passed through each member as described above. This allows the light emitting device 100 to emit light that is a mixture of the first light, the second light, and the third light. In particular, when the first light is blue light, the second light includes yellow-green to yellow light, and the third light includes orange to red light, the light emitting device 100 can adjust the chromaticity of the white light composed of the first light and the second light to the red side by adjusting the type and amount of the phosphor contained in the second wavelength conversion member. In other words, the light emitting device 100 can adjust the chromaticity of the light emitted by the light emitting device 100 by including the second wavelength conversion member 20.

[0045] Furthermore, the light emitted from the light emitting device 100 may not substantially contain the first light. For example, in the case of obtaining a light emitting device emitting orange to red light using a blue light emitting element, the light emitted from the light emitting device 100 may be composed almost entirely of the second light and the third light. In this case, too, the light emitting device includes a second wavelength conversion member, so that the chromaticity of the light emitted from the light emitting device can be adjusted. Furthermore, the first light can be prevented from leaking from the side surface of the light emitting device via the first light reflecting member.

[0046] Furthermore, when light emitting device 100 includes a second light reflective member, a portion of the light emitted from the side surface 3 and bottom surface 4 of light emitting element 1 that is not reflected by the side surface 3 and bottom surface 4 of light emitting element 1 and second light reflective member 40 and passes through second light reflective member 40 (e.g., arrow E1) enters second wavelength conversion member 20 (e.g., arrow D3). A portion of the first light that enters second wavelength conversion member 20 is converted into third light by second wavelength conversion member 20.

[0047] In this way, the light emitted from the second wavelength conversion member 20 includes the first light incident on the second wavelength conversion member 20 through the second light reflecting member 40, and the third light resulting from the first light. A part of the light passing through the second wavelength conversion member 20 (for example, arrow D3) is reflected by the first inclined surface 22 and / or the first light reflecting member 30 (for example, arrow D4), enters the first wavelength conversion member 10 from the first surface 21 (for example, arrow B3), and is emitted from the upper surface of the first wavelength conversion member 10 (for example, arrow C3). Therefore, the light incident on the second wavelength conversion member 20 through the second light reflecting member 40 can also constitute the light emitted by the light emitting device 100. That is, the light emitting device 100 configured as described above can also emit the light resulting from the first light transmitted through the second light reflecting member 40 from the light emitting surface. As a result, the light extraction efficiency of the light emitting device 100 can be improved. In addition, the arrows in Fig. 4 are merely schematic illustrations of the directions in which some of the light travels in order to simplify the explanation. In reality, when light passes between and through each member, the direction of travel changes as appropriate due to differences in the refractive index of each member, scattering by the included members, etc.

[0048] Furthermore, the content of the third light emitted from the light-emitting surface can be adjusted by appropriately changing the shapes and volumes of the first inclined surface 22 and the second inclined surface 23, the amount of phosphor contained in the second wavelength conversion member 20, etc. In other words, the color of the light emitted by the light-emitting device 100 can be appropriately adjusted.

[0049] 2. Manufacturing method The method for manufacturing the light emitting device 100 includes the steps of: (1) preparing an assembly substrate; (2) arranging a protrusion; (3) disposing a light-emitting element; (4) disposing a first wavelength conversion member; (5) placing a protective element; (6) disposing a second light reflective member; (7) disposing a second wavelength conversion member; (8) disposing a second light reflective member; (9) singulating the assembly substrate; Includes. Each step will be described below with reference to FIGS. 5A to 5H.

[0050] (1) Preparing the assembly board In the step of preparing an aggregate substrate, an aggregate substrate 50A including a plurality of substrate 50 regions is prepared as shown in Fig. 5A. The substrates 50 are arranged, for example, in a matrix as shown in Fig. 5B. The aggregate substrate 50A includes wiring 56 of a predetermined pattern for each range of the light emitting device 100 to be manufactured. 5A and 5B are imaginary lines indicating the boundaries of the substrate 50 of the light emitting device 100 to be manufactured in order to facilitate understanding of the drawings. Also, the wiring 56 shown in FIG. 5B is represented in a simplified shape in order to facilitate understanding of the drawings.

[0051] The wiring 56 can be arranged by a known technique such as plating, vapor deposition, or sputtering. The collective substrate 50A may be prepared by purchasing or receiving a substrate on which the wiring 56 is already arranged.

[0052] (2) The process of arranging the protrusions In the step of arranging the convex portions, a frame-shaped convex portion 90A is arranged on the upper surface of the collective substrate 50A. As shown in Fig. 5B, the convex portion 90A collectively surrounds the mounting regions R1 of the light emitting devices 100 to be manufactured so as to separate the mounting regions R1 and the external connection regions R2 of the light emitting devices 100. By arranging the convex portion 90A in this manner, in the step described below, the second light reflective member 40, the second wavelength conversion member 20, and the first light reflective member 30 can be easily arranged only in the region surrounded by the convex portion 90A.

[0053] (3) Step of arranging the light emitting element In the step of arranging the light-emitting element, the light-emitting element 1 is arranged on the wiring 56 surrounded by the protrusion 90A, as shown in Fig. 5C. The light-emitting element 1 is arranged via a bump 70, for example.

[0054] (4) Step of disposing the first wavelength conversion member In the step of arranging the first wavelength conversion member, as shown in Fig. 5D, the first wavelength conversion member 10 is arranged on the upper surface 2 of the light-emitting element 1. The first wavelength conversion member 10 is bonded to the light-emitting element 1 using, for example, a light-transmitting adhesive. In addition, the step of arranging the first wavelength conversion member may be performed before the step of arranging the light-emitting element. In this case, in the step of arranging the light-emitting element, the light-emitting element 1 with the first wavelength conversion member is arranged on the wiring 56.

[0055] (5) Step of placing protective elements In the step of arranging the protective element, as shown in Fig. 5E, the protective element 80 is arranged on the wiring 56 surrounded by the protruding portion 90A. The protective element 80 is arranged, for example, via a bump.

[0056] (6) Step of disposing a second light reflective member In the step of arranging the second light reflective member, as shown in FIG. 5F, the second light reflective member 40 is arranged in the area surrounded by the convex portion 90A so as to cover the side surface 3 of the light emitting element 1. Specifically, the uncured second light reflective member 40 is arranged around the protective element 80 by potting, spraying, or the like. The uncured second light reflective member 40 creeps up the side surface 3 of the light emitting element 1 due to surface tension, and covers the side surface 3 of the light emitting element 1. As a result, the second light reflective member 40 has a shape that expands as it approaches the collective substrate 50A, and the second light reflective member 40 having the first curved surface 41 that moves away from the light emitting element 1 as it approaches the collective substrate 50A is obtained. The first curved surface 41 has a curved shape that is convex toward the light emitting element 1 side.

[0057] (7) Step of disposing a second wavelength conversion member In the step of arranging the second wavelength conversion member, as shown in FIG. 5G, the second wavelength conversion member 20 is arranged in an area surrounded by the convex portion 90A so as to cover the side surface 13 of the first wavelength conversion member 10. Specifically, the uncured second wavelength conversion member 20 is arranged on the first curved surface 41 of the second light reflective member 40 by potting, spraying, or the like. The uncured second wavelength conversion member 20 creeps up the side surface 13 of the first wavelength conversion member 10 due to surface tension, and covers the side surface 13 of the first wavelength conversion member 10. This results in the second wavelength conversion member 20 having the first inclined surface 22 that moves away from the side surface 13 of the first wavelength conversion member 10 as it approaches the upper surface of the collective substrate 50A. In the light emitting device 100, the first inclined surface 22 is arranged at a position lower than the upper surface 11 of the first wavelength conversion member 10, and has a curved shape that is convex toward the inside (i.e., toward the first wavelength conversion member 10 and the light emitting element 1). Moreover, the second wavelength conversion member 20 covers the first curved surface 41 of the second light reflective member 40. As a result, the second wavelength conversion member 20 has a second inclined surface 23 along the first curved surface 41 at the interface with the second light reflective member 40.

[0058] (8) Step of disposing a first light reflective member In the step of arranging the first light reflective member, as shown in Fig. 5H, the first light reflective member 30 is arranged in the area surrounded by the convex portion 90A. Specifically, the uncured first light reflective member 30 is arranged on the first inclined surface 22 of the second wavelength conversion member 20 by potting, spraying, or the like, and is flattened by its own weight. At this time, it is preferable to adjust the supply amount so that the surface of the first light reflective member 30 is aligned with the upper surface 11 of the first wavelength conversion member 10, that is, so that both surfaces are positioned on approximately the same plane. Thereafter, the first light reflective member 30, the second wavelength conversion member 20, and the second light reflective member 40 are cured, for example, by heating.

[0059] (9) Slicing process In the step of dividing into individual pieces, cutting is performed at cutting positions CL, an example of which is shown in Fig. 5H, to obtain the light emitting devices 100. The cutting is performed using, for example, a blade.

[0060] The above manufacturing method provides a light emitting device 100 including a first light reflective member 30, a second wavelength conversion member 20, and a second light reflective member 40. In addition, it is preferable that the first light reflective member 30, the second wavelength conversion member 20, and the second light reflective member 40 are cured by heating or the like after flowing into a desired shape. This makes it possible to easily form a desired interface shape between each member. However, the first light reflective member 30, the second wavelength conversion member 20, and the second light reflective member 40 may be cured simultaneously. For example, the second light reflective member 40 is applied, its shape is defined, and it is temporarily cured. Thereafter, the second wavelength conversion member 20 is applied, its shape is defined, and it is temporarily cured. Then, the first light reflective member 30 is applied, and the first light reflective member 30, the second wavelength conversion member 20, and the second light reflective member 40 may be permanently cured. Each component may be cured and molded under conditions appropriate for that component, and the material is selected so that the curing conditions for each component do not adversely affect the other components. Each component may use the same or different materials as the base material.

[0061] 3. Embodiment 2 A light emitting device 200 according to a second embodiment of the present disclosure will be described with reference to Fig. 6. The light emitting device 200 differs from the light emitting device 100 according to the first embodiment in that a second wavelength conversion member 220 covers the side surface 3 of the light emitting element 1.

[0062] The second wavelength conversion member 220 covers the side surface of the first wavelength conversion member 10 and also covers the side surface 3 of the light emitting element 1. When the light emitting element 1 includes multiple side surfaces, for example, four side surfaces, the second wavelength conversion member 220 continuously covers the multiple side surfaces of the light emitting element 1. The second wavelength conversion member 220 may cover the entire side surface 3 of the light emitting element 1, or may cover, for example, the lower part of the side surface 3 of the light emitting element 1 while exposing it. In this case, the side surface 3 of the light emitting element 1 exposed from the second wavelength conversion member 220 is covered with the second light reflective member 40.

[0063] In the light emitting device 200 configured in this manner, a portion of the first light emitted from the side surface 3 of the light emitting element 1 is converted into a third light by the second wavelength conversion member 20. The first light incident on the second wavelength conversion member 20 and a portion of the third light obtained by wavelength conversion of the first light are reflected by the first inclined surface 22 and / or the second inclined surface 23, are incident on the first wavelength conversion member 10, and are emitted from the upper surface of the first wavelength conversion member 10.

[0064] This allows the light emitting device 200 to emit white light having a desired chromaticity. In addition, the light emitting device 200 can convert a larger portion of the first light emitted from the light emitting element 1 into the third light, thereby increasing the proportion of the third light contained in the light emitted from the light emitting device 200.

[0065] 4. Embodiment 3 A light emitting device 100B according to a third embodiment of the present disclosure will be described with reference to Fig. 8. The light emitting device 100B differs from the light emitting device 100 according to the first embodiment in that the shape of the first wavelength conversion member 10B is different. The first wavelength conversion member 10 exemplified in the above embodiment is a flat plate-shaped member in which the upper surface 11 and the lower surface 12 have the same shape and dimensions, but is not limited to this. The first wavelength conversion member may be a rectangular member in which the upper surface 11B and the lower surface 12B have different dimensions, as in the light emitting device 100B shown in FIG.

[0066] When the upper surface 11B and the lower surface 12B have different dimensions, the side surface 13B of the first wavelength conversion member 10B includes, for example, a first side surface 14 continuing to the upper surface 11B and a second side surface 15 continuing to the lower surface 12B. The first side surface 14 includes a plurality of side surfaces. Specifically, the first side surface 14 includes four surfaces that are connected to the respective sides of the rectangular upper surface 11B. Each of the four surfaces is, for example, a plane perpendicular to the upper surface 11B. The second side surface 15 includes a plurality of side surfaces. Specifically, the second side surface 15 includes four third side surfaces 16 that connect to each side of the rectangular bottom surface 12B, and four fourth side surfaces 17 that are continuous with the four third side surfaces 16, respectively. Each of the four third side surfaces 16 is, for example, a plane that is perpendicular to the bottom surface 12B. Each of the four fourth side surfaces 17 connects each of the third side surfaces 16 to each of the first side surfaces 14. Each of the fourth side surfaces 17 is, for example, a plane that is parallel to the top surface 11B and the bottom surface 12B.

[0067] By making the first wavelength conversion member 10 have the above-mentioned configuration, the area of ​​the light extraction surface is reduced, and the light emitting device 100B can have a higher brightness.

[0068] Furthermore, in the side surface 13B of the first wavelength conversion member 10B having the above-mentioned configuration, the first side surface 14 and the second side surface 15 may be continuously covered by the second wavelength conversion member 20. Moreover, the entire first side surface 14 and the entire second side surface 15 may be covered by the second wavelength conversion member 20. Moreover, an upper portion of the first side surface 14, or parts of the first side surface 14 and the second side surface 15 may be exposed from the second wavelength conversion member 20.

[0069] 5. Working Example As an example of the light emitting device, the light emitting device according to the first embodiment was produced. The light emitting element used was a GaN-based semiconductor light emitting element that emitted a first light having an emission peak wavelength of 450 nm. The first wavelength conversion member is a plate-shaped sintered body containing an yttrium-aluminum-garnet phosphor as a phosphor. The first wavelength conversion member emits the second light having an emission peak wavelength in the range of 520 nm to 560 nm. The second wavelength conversion member uses a silicone resin containing titanium oxide as a light reflective material and BSESN phosphor as a phosphor. The amount of titanium oxide contained in the second wavelength conversion member is 60 parts by mass with respect to 100 parts by mass of the silicone resin. The amount of phosphor contained in the second wavelength conversion member is 10 parts by mass with respect to 100 parts by mass of the silicone resin. The second wavelength conversion member emits third light having an emission peak wavelength in the range of 600 nm to 620 nm. The first light reflective member is made of silicone resin containing titanium oxide as a light reflective material. The amount of titanium oxide contained in the first light reflective member is 60 parts by mass per 100 parts by mass of silicone resin. The second light reflective member is made of silicone resin containing titanium oxide as a light reflective material. The amount of titanium oxide contained in the second light reflective member is 60 parts by mass per 100 parts by mass of silicone resin.

[0070] As the light emitting device of Comparative Example 1, a light emitting device similar to the light emitting device of the Example except that the second wavelength conversion member was not provided was prepared.

[0071] For the light emitting devices of Example and Comparative Example 1 thus produced, the x, y chromaticity coordinates of the chromaticity diagram in the CIE1931 color system were determined using a light measurement system combining a multichannel spectroscope and an integrating sphere. FIG. 9 shows a graph of chromaticity coordinates plotting the chromaticity of light emitted by the light emitting device of the embodiment and the chromaticity of light emitted by the light emitting device of the comparative example. In FIG. 9, plot P1 is the chromaticity of light emitted from the entire light emitting device of the embodiment. In FIG. 9, plot P2 is the chromaticity of light emitted from the entire light emitting surface of the embodiment. In FIG. 9, plot Q1 is the chromaticity of light emitted from the entire light emitting device of the comparative example. In FIG. 9, plot Q2 is the chromaticity of light emitted from the entire light emitting surface of the comparative example.

[0072] As a result of comparing the chromaticity of the light emitted by the light emitting device of the embodiment with the chromaticity of the light emitted by the light emitting device of the comparative example based on the above graph, it was revealed that the chromaticity of the light emitted by the light emitting device of the embodiment is closer to red than the light emitted by the light emitting device of the comparative example. In other words, by providing the light emitting device of the embodiment with the second wavelength conversion member, the chromaticity of the light emitted from the light emitting device can be adjusted.

[0073] The light emitting device according to the embodiment of the present disclosure can be used as a light emitting device for various applications, for example, as a headlight of a vehicle.

[0074] Although each embodiment of the present disclosure has been described above, the disclosed contents may vary in details of the configuration, and the combination and order of elements in each embodiment may be changed without departing from the scope and concept of the present disclosure as claimed. [Explanation of symbols]

[0075] 1 Light emitting element 2 Top surface 3. Aspects 4 Bottom side 5. Semiconductor laminate 6 electrodes 7 Support substrate 10, 10B First wavelength conversion member 11, 11B top surface 12, 12B bottom surface 13, 13B side 13A Upper 14 First aspect 15 Second aspect 16 Third aspect 17 Fourth aspect 20, 220, 20A Second wavelength conversion member 21 Page 1 22 1st slope 23 Second slope 30 First light reflective member 31~34 Side 40 Second light reflective member 41 First curved surface 50 Substrates 50A collective board 51 First aspect 52 Second aspect 53 Third aspect 54 Fourth aspect 55 Base material 56 Wiring 70 Bump 80 Protection element 90A Convex 91 First protrusion 92 Second convex part 100, 200, 100A, 100B Light-emitting device R1 Mounting area R2 External connection area

Claims

1. A substrate, a light emitting element disposed on the substrate and emitting a first light; a first wavelength conversion member disposed on the light emitting element and including a phosphor that is excited by the first light and emits a second light; a second wavelength conversion member that exposes an upper surface of the first wavelength conversion member, covers a side surface of the first wavelength conversion member, a side surface of the light emitting element, and an upper surface of the substrate, and has an inclined surface extending from the side surface of the first wavelength conversion member toward an outside, the second wavelength conversion member including a phosphor that is excited by at least one of the first light and the second light to emit a third light, and a light reflective material; a first light reflective member covering the inclined surface; A light emitting device comprising:

2. The light emitting device according to claim 1 , further comprising a second light reflective member disposed between a side surface of the light emitting element and the second wavelength conversion member.

3. The light emitting device according to claim 2 , wherein the second light reflective member covers a side surface of the light emitting element.

4. The light emitting device according to claim 2 , wherein the second light reflective member includes titanium oxide.

5. an upper portion of the side surface of the first wavelength converting member is exposed from the second wavelength converting member; The light emitting device according to claim 1 , wherein the first light reflective member covers a side surface of the first wavelength conversion member that is exposed from the second wavelength conversion member.

6. the side surface of the first wavelength conversion member includes a first side surface connected to the upper surface and a second side surface connected to the lower surface, The light emitting device according to claim 1 , wherein the second wavelength conversion member covers the first side surface and the second side surface continuously.

7. a peak wavelength of the second light is longer than a peak wavelength of the first light, The light emitting device according to claim 1 , wherein a peak wavelength of the third light is longer than a peak wavelength of the first light and a peak wavelength of the second light.

8. the first light is blue light; the second light is a yellow light; The light emitting device according to claim 1 , wherein the third light is red light.

9. The light emitting device includes a gallium nitride based semiconductor layer, The light emitting device according to claim 1 , wherein the first wavelength conversion member includes an yttrium aluminum garnet phosphor.

10. A light emitting device described in any one of claims 1 to 9, wherein the second wavelength conversion member contains BSESN phosphor and titanium oxide.

Images