JP7227482B2 - light emitting device - Google Patents

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JP7227482B2
JP7227482B2 JP2019065979A JP2019065979A JP7227482B2 JP 7227482 B2 JP7227482 B2 JP 7227482B2 JP 2019065979 A JP2019065979 A JP 2019065979A JP 2019065979 A JP2019065979 A JP 2019065979A JP 7227482 B2 JP7227482 B2 JP 7227482B2
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light emitting
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emitting element
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emitting elements
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JP2020167266A (en
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勇気 福崎
篤史 板東
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Nichia Corp
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Nichia Corp
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Description

本開示は、発光装置に関する。 The present disclosure relates to light emitting devices.

特許文献１には、赤色蛍光体を含む第２封止材料が上面に配置された近紫外ＬＥＤチップ（以下、第１光源）と、第２封止材料が上面に配置されない近紫外LEDチップ（以下、第２光源）と、第１光源および第２光源を一体に被覆し黄色蛍光体を含む第１封止材料とを備えた発光装置が開示されている。 Patent Document 1 discloses a near-ultraviolet LED chip (hereinafter referred to as a first light source) on which a second encapsulating material containing a red phosphor is placed on the top surface, and a near-ultraviolet LED chip on which the second encapsulating material is not placed on the top surface ( A light emitting device is disclosed that includes a second light source (hereinafter referred to as a second light source) and a first sealing material that integrally covers the first light source and the second light source and includes a yellow phosphor.

特開２０１３－１２０８１２号公報JP 2013-120812 A

しかしながら、特許文献１の発光装置では、第２光源により励起された黄色蛍光体の発する光が第２封止材料内に入り、その光の一部が赤色蛍光体に吸収される可能性がある。これにより、発光装置における光取り効率が低下する可能性がある。 However, in the light-emitting device of Patent Document 1, light emitted by the yellow phosphor excited by the second light source enters the second sealing material, and part of the light may be absorbed by the red phosphor. . This may reduce the light extraction efficiency of the light emitting device.

そこで、本発明の一実施形態では、光取り出し効率が向上した発光装置を提供することを目的とする。 Accordingly, an object of one embodiment of the present invention is to provide a light-emitting device with improved light extraction efficiency.

本発明の一実施形態の発光装置は、複数の第１発光素子と、第１発光素子の上面上に位置し、第１発光素子の側面を露出し、第１蛍光体を含む樹脂からなる第１透光性部材と、複数の第１発光素子の個数以下であり、上面上に第１透光性部材が位置しない複数の第２発光素子と、複数の第１発光素子、複数の第２発光素子および複数の第１透光性部材を被覆し、前記第１蛍光体が発する光よりも短波長の光を発する第２蛍光体を含む封止部材とを備える。 A light-emitting device according to an embodiment of the present invention includes a plurality of first light-emitting elements, and a first light-emitting element positioned on the top surface of the first light-emitting elements, exposing the side surfaces of the first light-emitting elements, and made of a resin containing a first phosphor. a light-transmitting member; a plurality of second light-emitting elements, the number of which is equal to or less than the number of the plurality of first light-emitting elements; and a sealing member that covers the light emitting element and the plurality of first translucent members and contains a second phosphor that emits light having a shorter wavelength than the light emitted by the first phosphor.

本発明の一実施形態により、光取り出し効率が向上した発光装置を提供することが可能となる。 According to one embodiment of the present invention, it is possible to provide a light emitting device with improved light extraction efficiency.

一実施形態に係る発光装置の模式的上面図である。1 is a schematic top view of a light emitting device according to one embodiment; FIG. 図１Ａ中の１Ｂ－１Ｂ線における模式端面図である。1B is a schematic end view along line 1B-1B in FIG. 1A. FIG. 発光装置の変形例を示す模式的上面図である。It is a schematic top view which shows the modification of a light-emitting device. 発光装置の変形例を示す模式的上面図である。It is a schematic top view which shows the modification of a light-emitting device.

以下、図面に基づいて詳細に説明する。複数の図面に表れる同一符号の部分は同一もしくは同等の部分又は部材を示す。
さらに以下は、本発明の技術思想を具体化するための発光装置を例示するものであって、本発明を以下に限定するものではない。構成部品の寸法、材質、形状、その相対的配置等は、特定的な記載がない限り、本発明の範囲をそれのみに限定する趣旨ではなく、例示することを意図したものである。また、各図面が示す部材の大きさや位置関係等は、理解を容易にする等のために誇張している場合がある。 A detailed description will be given below with reference to the drawings. Parts with the same reference numbers that appear in multiple drawings indicate the same or equivalent parts or members.
Furthermore, the following are examples of light-emitting devices for embodying the technical idea of the present invention, and the present invention is not limited to the following. Unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of components are intended to be illustrative rather than limiting the scope of the present invention. In addition, the sizes and positional relationships of members shown in each drawing may be exaggerated for ease of understanding.

図１Ａは一実施形態に係る発光装置１００の模式的上面図であり、図１Ｂは図１Ａ中の１Ｂ－１Ｂ線における模式的端面図である。図１Ａでは、凹部２の内部が分かりやすいように封止部材４０を省略して図示している。また、第１透光性部材１５の有無が分かりやすいように、第１発光素子１０の上面にハッチングを施している。図１Ｂでは、ワイヤ等を省略して図示している。 FIG. 1A is a schematic top view of a light emitting device 100 according to one embodiment, and FIG. 1B is a schematic end view taken along line 1B-1B in FIG. 1A. In FIG. 1A, the sealing member 40 is omitted so that the inside of the recess 2 can be easily understood. Further, the upper surface of the first light emitting element 10 is hatched so that the presence or absence of the first translucent member 15 can be easily recognized. In FIG. 1B, wires and the like are omitted from illustration.

図１Ａおよび図１Ｂに示す発光装置１００は、複数の第１発光素子１０と、第１発光素子１０の上面上に位置する第１透光性部材１５と、複数の第１発光素子１０の個数以下であり、上面上に第１透光性部材１５が位置しない複数の第２発光素子２０と、複数の第１発光素子１０、複数の第２発光素子２０および複数の第１透光性部材１５を被覆する封止部材４０とを備える。第１透光性部材１５は第１蛍光体６１を含み、封止部材４０は第２蛍光体６２を含む。図１Ａ等に示す発光装置１００は、凹部２を有するパッケージ５０をさらに備え、複数の第１発光素子１０および複数の第２発光素子２０は凹部２の底面に配置されている。 The light emitting device 100 shown in FIGS. 1A and 1B includes a plurality of first light emitting elements 10, a first translucent member 15 positioned on the upper surface of the first light emitting elements 10, and the number of the plurality of first light emitting elements 10. A plurality of second light-emitting elements 20 on which the first light-transmitting member 15 is not located on the upper surface, a plurality of first light-emitting elements 10, a plurality of second light-emitting elements 20, and a plurality of first light-transmitting members and a sealing member 40 covering 15 . The first translucent member 15 contains a first phosphor 61 and the sealing member 40 contains a second phosphor 62 . The light emitting device 100 shown in FIG. 1A and the like further includes a package 50 having a recess 2 , and the plurality of first light emitting elements 10 and the plurality of second light emitting elements 20 are arranged on the bottom surface of the recess 2 .

第１発光素子１０および第２発光素子２０は、発光装置１００の光源として機能する。第１発光素子１０および第２発光素子２０は、例えば、可視光の光を発する発光素子を用いることが好ましい。具体的には、第１発光素子１０および第２発光素子２０は、発光ピーク波長が４３０ｎｍ～４８０ｎｍである発光素子を用いることが好ましい。第１発光素子１０および第２発光素子２０が、近紫外領域よりも長波長の発光ピーク波長を有することで、近紫外領域の光の問題（例えば、人体や照射物に悪影響を及ぼしたり、発光装置の構成部材が劣化し発光装置の発光効率が大幅に低下するという問題）を抑制することができる。 The first light emitting element 10 and the second light emitting element 20 function as light sources of the light emitting device 100 . For the first light emitting element 10 and the second light emitting element 20, it is preferable to use, for example, light emitting elements that emit visible light. Specifically, the first light emitting element 10 and the second light emitting element 20 preferably use light emitting elements having an emission peak wavelength of 430 nm to 480 nm. Since the first light-emitting element 10 and the second light-emitting element 20 have emission peak wavelengths longer than those in the near-ultraviolet region, the problem of light in the near-ultraviolet region The problem that the luminous efficiency of the light-emitting device deteriorates due to the deterioration of the constituent members of the device) can be suppressed.

第１発光素子１０および第２発光素子２０は、それぞれの発光ピーク波長の波長差が５ｎｍ以下である発光素子を用いることが好ましい。第１発光素子１０および第２発光素子２０が同程度の発光ピーク波長を有する発光素子であることで、発光装置１００および発光装置１００を備える照明装置等における設計が容易になる。なお、第１発光素子１０および第２発光素子２０は異なる発光ピーク波長（波長差が５ｎｍより大きい）である発光素子であってもよい。例えば、第１発光素子１０は青色光を発する青色発光素子であり、第２発光素子２０は緑色光を発する緑色発光素子である。 For the first light emitting element 10 and the second light emitting element 20, it is preferable to use light emitting elements having emission peak wavelengths with a wavelength difference of 5 nm or less. Since the first light-emitting element 10 and the second light-emitting element 20 are light-emitting elements having approximately the same emission peak wavelength, the design of the light-emitting device 100 and the lighting device or the like provided with the light-emitting device 100 is facilitated. Note that the first light emitting element 10 and the second light emitting element 20 may be light emitting elements having different emission peak wavelengths (the wavelength difference is greater than 5 nm). For example, the first light emitting element 10 is a blue light emitting element that emits blue light, and the second light emitting element 20 is a green light emitting element that emits green light.

発光装置１００は、第１発光素子１０の上面上に位置する第１透光性部材１５を有する。第１透光性部材１５は、第１発光素子１０の上面と直接接して配置されていてもよく、第１透光性部材１５と第１発光素子１０の上面との間に保護層等の別の部材が位置し、第１発光素子１０の上方に間接的に配置されていてもよい。第１透光性部材１５は樹脂からなる。 The light emitting device 100 has a first translucent member 15 located on the upper surface of the first light emitting element 10 . The first translucent member 15 may be arranged in direct contact with the upper surface of the first light emitting element 10, and a protective layer or the like may be provided between the first translucent member 15 and the upper surface of the first light emitting element 10. Another member may be located and indirectly arranged above the first light emitting element 10 . The first translucent member 15 is made of resin.

第１透光性部材１５は、第１発光素子１０の側面を被覆しない。換言すると、第１発光素子１０の側面は第１透光性部材１５から露出する。これにより、封止部材４０内の第２蛍光体６２として励起効率が高い蛍光体を用いた場合に、第１発光素子１０から側方に出る光を第２蛍光体６２で効率的に励起することができる。その結果、光取り出しが良好な発光装置とすることができる。また、第１透光性部材１５となる液状の樹脂材料を第１発光素子１０の上面に塗布して配置する場合、第１発光素子１０の上面の縁部で樹脂材料に表面張力が働き、樹脂材料の広がりを第１発光素子１０の縁部内に留めることができる。これにより、複数の発光装置１００を製造する場合に、第１透光性部材１５の形状を安定して形成することができ、製造の歩留りを向上させることができる。また、第１透光性部材１５を安定して形成することで、所望の配光を有する発光装置１００を容易に得ることができる。 The first translucent member 15 does not cover the side surfaces of the first light emitting element 10 . In other words, the side surface of the first light emitting element 10 is exposed from the first translucent member 15 . As a result, when a phosphor with high excitation efficiency is used as the second phosphor 62 in the sealing member 40, the light emitted to the side from the first light emitting element 10 is efficiently excited by the second phosphor 62. be able to. As a result, a light-emitting device with good light extraction can be obtained. Further, when a liquid resin material to be the first translucent member 15 is applied to the upper surface of the first light emitting element 10 and arranged, surface tension acts on the resin material at the edge of the upper surface of the first light emitting element 10, The spreading of the resin material can be kept within the edge of the first light emitting element 10 . Thereby, when manufacturing a plurality of light emitting devices 100, the shape of the first translucent member 15 can be stably formed, and the manufacturing yield can be improved. Further, by stably forming the first translucent member 15, it is possible to easily obtain the light emitting device 100 having a desired light distribution.

第１透光性部材１５は第１蛍光体６１を含む。第１蛍光体６１は、例えば、半値幅の広い赤色蛍光体を用いることができる。これにより、発光装置１００の演色性を向上させることができる。赤色蛍光体の半値幅は、例えば８０ｎｍ以上１００ｎｍ以下であり、８５ｎｍ以上９５ｎｍ以下であることが好ましい。このような第１蛍光体６１として、例えば、下記式（１）で表される組成を有する赤色蛍光体を用いることができる。
（Ｓｒ，Ｃａ）ＡｌＳｉＮ３：Ｅｕ（１）
式（１）で表される組成を有する赤色蛍光体を用いることで、発光装置の演色性と光取り出しの双方を向上させることができる。第１蛍光体６１の含有量は、例えば、第１透光性部材１５の全重量に対して９重量％～５７重量％である。第１透光性部材１５内の第１蛍光体６１の含有量は各第１透光性部材１５で同じでもよく、異なっていてもよい。 First translucent member 15 includes first phosphor 61 . For the first phosphor 61, for example, a red phosphor having a wide half width can be used. Thereby, the color rendering properties of the light emitting device 100 can be improved. The half width of the red phosphor is, for example, 80 nm or more and 100 nm or less, preferably 85 nm or more and 95 nm or less. As such a first phosphor 61, for example, a red phosphor having a composition represented by the following formula (1) can be used.
(Sr, Ca) AlSiN3 :Eu(1)
By using the red phosphor having the composition represented by Formula (1), both the color rendering properties and light extraction of the light emitting device can be improved. The content of the first phosphor 61 is, for example, 9 wt % to 57 wt % with respect to the total weight of the first translucent member 15 . The content of the first phosphor 61 in the first translucent members 15 may be the same or different for each first translucent member 15 .

なお、第１蛍光体６１は、赤色の光を発する赤色蛍光体に限定されず、例えば、緑色の光を発する緑色蛍光体や青色の光を発する青色蛍光体であってもよい。また、第１蛍光体６１は、１種の蛍光体であってもよく、また複数種の蛍光体であってもよい。 The first phosphor 61 is not limited to a red phosphor that emits red light, and may be, for example, a green phosphor that emits green light or a blue phosphor that emits blue light. Also, the first phosphor 61 may be one type of phosphor, or may be a plurality of types of phosphors.

（封止部材４０）
封止部材４０は、複数の第１発光素子１０、複数の第２発光素子２０および複数の第１透光性部材１５を被覆し、第２蛍光体６２を含む。封止部材４０は、発光素子等を外力や埃、水分などから保護する役割を有する。 (sealing member 40)
The sealing member 40 covers the plurality of first light emitting elements 10 , the plurality of second light emitting elements 20 and the plurality of first translucent members 15 and includes a second phosphor 62 . The sealing member 40 has a role of protecting the light emitting element and the like from external force, dust, moisture, and the like.

第２蛍光体６２は、第１蛍光体６１よりも短波の光を発する蛍光体である。換言すると、第２蛍光体６２から出射される光は、第１蛍光体６１から出射される光よりも短波長である。これにより、第１蛍光体６１から発する光が第２蛍光体６２に吸収される割合を低減することができる。
第２蛍光体６２は、１種の蛍光体であってもよく、また複数種の蛍光体であってもよい。第２蛍光体６２として複数種の蛍光体を用いることで、例えば、発光装置１００の演色性を向上させることができる。第２蛍光体６２として、（Ｙ，Ｌｕ，Ｇｄ）３（Ａｌ，Ｇａ）５Ｏ１２：Ｃｅを用いることが好ましく、さらに、（Ｙ，Ｌｕ，Ｇｄ）３（Ａｌ，Ｇａ）５Ｏ１２：Ｃｅと（Ｓｒ，Ｃａ）ＡｌＳｉＮ３：Ｅｕとを混合したものを用いることがさらに好ましい。これにより、演色性の高い発光装置とすることができる。 The second phosphor 62 is a phosphor that emits light with a shorter wavelength than the first phosphor 61 . In other words, the light emitted from the second phosphor 62 has a shorter wavelength than the light emitted from the first phosphor 61 . As a result, the rate at which the light emitted from the first phosphor 61 is absorbed by the second phosphor 62 can be reduced.
The second phosphor 62 may be one type of phosphor, or may be a plurality of types of phosphors. By using a plurality of types of phosphors as the second phosphor 62, for example, the color rendering properties of the light emitting device 100 can be improved. (Y, Lu, Gd) 3 (Al, Ga) 5 O 12 :Ce is preferably used as the second phosphor 62, and (Y, Lu, Gd) 3 (Al, Ga) 5 O 12 : It is more preferable to use a mixture of Ce and (Sr, Ca)AlSiN 3 :Eu. Accordingly, a light-emitting device with high color rendering properties can be obtained.

発光装置１００は、複数の第１発光素子１０と、第１発光素子１０の上面上に位置する第１透光性部材１５と、複数の第１発光素子１０の個数以下であり、上面上に第１透光性部材１５が位置しない複数の第２発光素子２０とを備える。図１Ａで示す発光装置１００は、複数の発光素子を備え、複数の発光素子のうち半分以上の発光素子の上面上に第１透光性部材１５が位置している。これにより、複数の発光素子のうち半分以上の発光素子から出射される光の大部分は第１透光性部材１５を通り封止部材４０を通ることになる。その結果、波長の長い第１蛍光体６１が発する光が波長の短い第２蛍光体６２に吸収される割合を低減することができ、発光装置１００の光取り出し効率を向上させることができる。 The light emitting device 100 includes a plurality of first light emitting elements 10, a first translucent member 15 positioned on the upper surface of the first light emitting elements 10, and the number of the plurality of first light emitting elements 10 or less. and a plurality of second light emitting elements 20 on which the first translucent member 15 is not positioned. The light-emitting device 100 shown in FIG. 1A includes a plurality of light-emitting elements, and the first translucent member 15 is positioned on the upper surface of more than half of the plurality of light-emitting elements. Accordingly, most of the light emitted from more than half of the plurality of light emitting elements passes through the first translucent member 15 and the sealing member 40 . As a result, the ratio of the light emitted by the long-wavelength first phosphor 61 absorbed by the short-wavelength second phosphor 62 can be reduced, and the light extraction efficiency of the light-emitting device 100 can be improved.

複数の第１発光素子１０および複数の第２発光素子２０の配置は、所望の配光を得るために種々の配置にすることができる。例えば、複数の第１発光素子１０が第１方向Ｆに配列された第１素子群１０ａと、複数の第２発光素子２０が第１方向Ｆに配列された第２素子群２０ａとが、第１方向Ｆと直交する第２方向Ｓに順に配列された配置でもよい。同種の発光素子（第１透光性部材１５が配置される第１発光素子１０または第１透光性部材１５が配置されない第２発光素子２０）をライン状に配置することで、例えば、外観検査装置において各発光素子の外観を検査する際に、ラインごとに検査をすることが可能となり外観検査工程が容易になる。工程が簡略になることで、各発光装置のコストを低減することができる。図１Ａで示す発光装置１００では、２つの第１素子群１０ａと、２つの第１素子群１０ａの間に位置する第２素子群２０ａとを有している。具体的には、発光装置１００は、２つの第１発光素子１０を有する第１素子群１０ａが２つあり、２つの第１素子群１０ａの間に位置し３つの第２発光素子２０を有する第２素子群２０ａを備えている。２つの第１素子群１０ａの間に第２素子群２０ａが位置していることで、発光装置１００全体の混色性が向上する。また、第１透光性部材１５が上面上に位置する第１発光素子１０の個数が第２発光素子２０の個数よりも多いため、複数の発光素子のうち半分以上の発光素子から出射される光の大部分が第１透光性部材１５を通り封止部材４０を通ることになる。その結果、発光装置１００の光取り出し効率を向上させることができる。また、図１Ｃで示すように、第１素子群１０ａが複数群ある場合に、各第１素子群１０ａにおける第１発光素子１０の個数は異ならせることができる。第２素子群２０ａが複数群ある場合も同様である。なお、第１発光素子１０および第２発光素子の配置は上記の形態に限られず、第１素子群１０ａが２つの第２素子群２０ａの間に位置していてもよい。第１透光性部材１５が配置される第１素子群１０ａを内側に配置することで、発光装置１００全体の混色性を向上させることができる。 The arrangement of the plurality of first light emitting elements 10 and the plurality of second light emitting elements 20 can be variously arranged to obtain the desired light distribution. For example, a first element group 10a in which a plurality of first light emitting elements 10 are arranged in the first direction F and a second element group 20a in which a plurality of second light emitting elements 20 are arranged in the first direction F are arranged in the first direction F. Arrangement arranged in order in the 2nd direction S orthogonal to 1 direction F may be sufficient. By arranging the same kind of light emitting elements (the first light emitting element 10 with the first translucent member 15 arranged or the second light emitting element 20 without the first translucent member 15 arranged) in a line, for example, the appearance When inspecting the appearance of each light-emitting element in the inspection apparatus, it becomes possible to inspect each line, which facilitates the appearance inspection process. By simplifying the process, the cost of each light-emitting device can be reduced. The light emitting device 100 shown in FIG. 1A has two first element groups 10a and a second element group 20a located between the two first element groups 10a. Specifically, the light-emitting device 100 has two first element groups 10a each having two first light-emitting elements 10, and three second light-emitting elements 20 located between the two first element groups 10a. A second element group 20a is provided. Since the second element group 20a is positioned between the two first element groups 10a, the color mixing of the light emitting device 100 as a whole is improved. In addition, since the number of the first light emitting elements 10 on which the first translucent member 15 is located is greater than the number of the second light emitting elements 20, light is emitted from more than half of the plurality of light emitting elements. Most of the light passes through the first translucent member 15 and through the sealing member 40 . As a result, the light extraction efficiency of the light emitting device 100 can be improved. Also, as shown in FIG. 1C, when there are a plurality of first element groups 10a, the number of first light emitting elements 10 in each first element group 10a can be varied. The same is true when there are a plurality of second element groups 20a. In addition, the arrangement of the first light emitting element 10 and the second light emitting element is not limited to the form described above, and the first element group 10a may be positioned between the two second element groups 20a. By arranging the first element group 10a in which the first translucent member 15 is arranged inside, the color mixing of the entire light emitting device 100 can be improved.

第１発光素子１０および第２発光素子２０は、平面視における１辺の長さが例えば１５０μｍ～９００μｍであり、４５０μｍ～８００μｍであることが好ましく、６３０μｍ～７８０μｍであることがより好ましい。隣接する第１発光素子１０間の離隔距離および隣接する第２発光素子２０間の離隔距離は、０．２ｍｍ以上１．５ｍｍ以下であることが好ましい。これにより、発光素子から出射される光が隣接する発光素子に吸収される可能性を低減することができ、発光装置の光取り出しが良好になる。また、第１発光素子１０と第２発光素子２０との離隔距離は、０．３ｍｍ以上１．５ｍｍ以下であることが好ましい。これにより、第２発光素子２０が発する光および第２発光素子２０の上面上に位置し第２発光素子２０が発する光により励起される第２蛍光体６２が発する光が、第１発光素子１０の上面上に位置する第１透光性部材１５内に含まれる第１蛍光体６１に吸収されることを抑制することができる。その結果、第２発光素子２０等が発する光を効率良く外部に取り出すことができ、光取り出しが良好な発光装置とすることができる。好適には、第１発光素子１０と第２発光素子２０との離隔距離は、隣接する第１発光素子１０間の離隔距離および隣接する第２発光素子２０間の離隔距離よりも大きいことが好ましい。第１発光素子１０と第２発光素子２０との離隔距離を大きくすることで、第２発光素子２０および第２発光素子２０の上面上に位置する第２蛍光体６２が発する光を効率的に外部に取り出しつつ、同種の発光素子間の距離を小さくすることで、小型の発光装置を提供することができる。 The length of one side of the first light emitting element 10 and the second light emitting element 20 in plan view is, for example, 150 μm to 900 μm, preferably 450 μm to 800 μm, more preferably 630 μm to 780 μm. The distance between adjacent first light emitting elements 10 and the distance between adjacent second light emitting elements 20 are preferably 0.2 mm or more and 1.5 mm or less. As a result, it is possible to reduce the possibility that the light emitted from the light emitting element is absorbed by the adjacent light emitting element, and the light extraction of the light emitting device is improved. Moreover, the separation distance between the first light emitting element 10 and the second light emitting element 20 is preferably 0.3 mm or more and 1.5 mm or less. As a result, the light emitted by the second light emitting element 20 and the light emitted by the second phosphor 62 located on the upper surface of the second light emitting element 20 and excited by the light emitted by the second light emitting element 20 are combined into the first light emitting element 10 can be suppressed from being absorbed by the first phosphor 61 contained in the first translucent member 15 located on the upper surface of the . As a result, the light emitted by the second light emitting element 20 and the like can be efficiently extracted to the outside, and the light emitting device can be provided with excellent light extraction. Preferably, the distance between the first light emitting elements 10 and the second light emitting elements 20 is larger than the distance between the adjacent first light emitting elements 10 and the distance between the adjacent second light emitting elements 20. . By increasing the separation distance between the first light emitting element 10 and the second light emitting element 20, the light emitted from the second light emitting element 20 and the second phosphor 62 positioned on the upper surface of the second light emitting element 20 can be efficiently emitted. A small light-emitting device can be provided by reducing the distance between light-emitting elements of the same type while taking them out.

複数の第１発光素子１０の個数は、複数の第２発光素子２０の個数に対して１．２倍以上の個数（整数）であることが好ましく、２倍以上の個数（整数）であることがより好ましい。これにより、光取り出しが良好な発光装置１００を提供することができる。なお、各発光素子の個数の比率は上記に限定されない。 The number of the plurality of first light emitting elements 10 is preferably 1.2 times or more (integer) the number of the plurality of second light emitting elements 20, and the number (integer) is 2 times or more. is more preferred. Thereby, the light-emitting device 100 with good light extraction can be provided. Note that the ratio of the number of light emitting elements is not limited to the above.

第１透光性部材１５の上面は、湾曲面であることが好ましい。これにより、第１透光性部材１５の表面（第１発光素子１０側の内表面）において、第１発光素子１０が発する光が全反射されて第１発光素子１０側に戻る可能性を低減することができる。これにより、発光装置１００の光取り出し効率を向上させることができる。なお、第１透光性部材１５の上面は、平坦面であってもよく、湾曲面と平坦面とを組み合わせた形状であってもよい。また、第１透光性部材１５の高さは、各第１透光性部材１５で同じでもよく、異なっていてもよい。 The upper surface of the first translucent member 15 is preferably a curved surface. This reduces the possibility that the light emitted by the first light emitting element 10 is totally reflected on the surface of the first translucent member 15 (the inner surface on the first light emitting element 10 side) and returns to the first light emitting element 10 side. can do. Thereby, the light extraction efficiency of the light emitting device 100 can be improved. The upper surface of the first translucent member 15 may be a flat surface, or may have a shape in which a curved surface and a flat surface are combined. Moreover, the height of the first translucent members 15 may be the same or different for each of the first translucent members 15 .

第１透光性部材１５は、第１発光素子１０の上面の５０％以上の面積を被覆することが好ましく、第１発光素子１０の上面全面を被覆することがより好ましい。これにより、第１発光素子１０を外力や埃、水分などから保護することが可能となる。また、封止部材４０の母材の屈折率を第１透光性部材１５の母材の屈折率よりも大きく設定することで、凹部２内において第１発光素子１０側に戻る光を第１透光性部材１５の上面で上方に反射させやすくなる。これにより、発光装置１００の光取り出し効率を向上させることができる。 The first translucent member 15 preferably covers 50% or more of the upper surface of the first light emitting element 10 , and more preferably covers the entire upper surface of the first light emitting element 10 . This makes it possible to protect the first light emitting element 10 from external force, dust, moisture, and the like. Further, by setting the refractive index of the base material of the sealing member 40 to be higher than the refractive index of the base material of the first translucent member 15 , the light returning to the first light emitting element 10 side in the recess 2 is directed to the first light emitting element 10 side. The upper surface of the translucent member 15 facilitates upward reflection. Thereby, the light extraction efficiency of the light emitting device 100 can be improved.

第１透光性部材１５は、上面に微小な凹凸を有することが好ましい。これにより、第１透光性部材１５と封止部材４０との密着性を向上させることができる。微小な凹凸は、例えば、第１透光性部材１５の上面に粗面化処理を施すことにより形成することができる。粗面化処理としては、例えば、プラズマ処理、エッチング処理、ブラスト処理、又は微粒子を付着させる方法等を挙げることができる。 The first translucent member 15 preferably has fine unevenness on its upper surface. Thereby, the adhesion between the first translucent member 15 and the sealing member 40 can be improved. The minute unevenness can be formed, for example, by roughening the upper surface of the first translucent member 15 . Examples of roughening treatment include plasma treatment, etching treatment, blasting treatment, and a method of adhering fine particles.

封止部材４０の母材となる樹脂材料の屈折率は、第１透光性部材１５の母材となる樹脂材料の屈折率と同じ又は高いことが好ましい。これにより、第１透光性部材１５内において、第１透光性部材１５から封止部材４０へ進む光は、第１透光性部材１５と封止部材４０との界面において透過しやすい。一方、封止部材４０から第１透光性部材１５へ進む光は、第１透光性部材１５と封止部材４０との界面において反射されやすい。これにより、発光装置１００の光取り出し効率を効果的に向上させることができる。 The refractive index of the resin material that is the base material of the sealing member 40 is preferably the same as or higher than the refractive index of the resin material that is the base material of the first translucent member 15 . Accordingly, in the first translucent member 15 , light traveling from the first translucent member 15 to the sealing member 40 is easily transmitted through the interface between the first translucent member 15 and the sealing member 40 . On the other hand, light traveling from the sealing member 40 to the first translucent member 15 is likely to be reflected at the interface between the first translucent member 15 and the sealing member 40 . Thereby, the light extraction efficiency of the light emitting device 100 can be effectively improved.

封止部材４０の母材となる樹脂材料の屈折率と、第１透光性部材１５の母材となる樹脂材料の屈折率との差は、例えば、０～０．２であり、０．５～０．１５であることが好ましい。例えば、第１透光性部材１５の母材となる樹脂材料の屈折率は１．４～１．６であり、封止部材４０の母材となる樹脂材料の屈折率は、１．４～１．６である。なお、この場合の屈折率は、例えば、屈折率測定装置を用いて、最小偏角法、臨界角法またはVブロック法等により測定される。 The difference between the refractive index of the resin material that is the base material of the sealing member 40 and the refractive index of the resin material that is the base material of the first translucent member 15 is, for example, 0 to 0.2. It is preferably between 5 and 0.15. For example, the refractive index of the resin material that is the base material of the first translucent member 15 is 1.4 to 1.6, and the refractive index of the resin material that is the base material of the sealing member 40 is 1.4 to 1.4. 1.6. The refractive index in this case is measured by, for example, a minimum deflection angle method, a critical angle method, a V-block method, or the like using a refractive index measuring device.

図１Ｂで示すように、封止部材４０は、第１透光性部材１５の上方に位置する上面に凸部９を有することが好ましい。これにより、第１透光性部材１５から上方に出る光を凸部９から効率良く外部に取り出すことができる。凸部９は、例えば、図１Ｂで示すように、封止部材４０の上面のうち曲率が変化する２つの変曲点で規定される部分である As shown in FIG. 1B, the sealing member 40 preferably has a convex portion 9 on the upper surface located above the first translucent member 15 . As a result, light emitted upward from the first translucent member 15 can be efficiently extracted to the outside from the convex portion 9 . For example, as shown in FIG. 1B, the convex portion 9 is a portion of the upper surface of the sealing member 40 defined by two inflection points where the curvature changes.

また、図１Ｄで示すように、第１発光素子１０および第２発光素子２０は、上面視において、第１発光素子１０および第２発光素子２０のそれぞれの辺が凹部２の一の内側面に対して傾斜するように配置されてもよい。図１Ｄでは、凹部２は４つの内側面を有し、第１発光素子１０および第２発光素子２０は上側から見た外形が矩形状である発光素子である。第１発光素子１０および第２発光素子２０を上記のように配置することで、発光素子の側面から出た光が凹部２の内側面で反射されて発光素子側に戻り、その光の一部が発光素子に吸収されることを抑制することができる。特に、凹部２の内側面の近傍に配置される発光素子において、内側面と発光素子の側面との距離が大きくなるように発光素子を傾斜させて配置することで、発光装置の光取り出しが良好となる。上面視において、発光素子の一の辺の仮想線と、凹部２の内側面の仮想線とからなる角度θは、０度より大きく９０度よりも小さく、例えば、１５度、３０度、４５度、６０度または７５度である。好ましくは、角度θは３０度または４５度である。 In addition, as shown in FIG. 1D, each side of the first light emitting element 10 and the second light emitting element 20 is located on one inner side surface of the recess 2 when viewed from above. You may arrange|position so that it may incline with respect to. In FIG. 1D, the recess 2 has four inner side surfaces, and the first light emitting element 10 and the second light emitting element 20 are light emitting elements having a rectangular outer shape when viewed from above. By arranging the first light emitting element 10 and the second light emitting element 20 as described above, the light emitted from the side surface of the light emitting element is reflected by the inner surface of the recess 2 and returns to the light emitting element side, and part of the light can be suppressed from being absorbed by the light emitting element. In particular, in the light emitting element arranged near the inner side surface of the recess 2, by arranging the light emitting element at an angle so that the distance between the inner side surface and the side surface of the light emitting element is increased, the light extraction of the light emitting device is excellent. becomes. When viewed from the top, the angle θ formed by the virtual line of one side of the light emitting element and the virtual line of the inner surface of the recess 2 is greater than 0 degrees and less than 90 degrees, such as 15 degrees, 30 degrees, and 45 degrees. , 60 degrees or 75 degrees. Preferably, the angle θ is 30 degrees or 45 degrees.

（パッケージ）
発光装置１００は、凹部２を有するパッケージ５０を備えることができる。パッケージ５０は、発光素子を配置するための基台である。図１Ａおよび図１Ｂで示すパッケージ５０は、第１リード５１および第２リード５２と、第１リード５１および第２リード５２を保持する樹脂部３０とを備えている。パッケージ５０は凹部２を有し、凹部２の底面において、第１リード５１および第２リード５２の上面の一部が位置している。 (package)
The light emitting device 100 can comprise a package 50 having a recess 2 . The package 50 is a base for arranging the light emitting element. A package 50 shown in FIGS. 1A and 1B includes first leads 51 and second leads 52 and a resin portion 30 holding the first leads 51 and second leads 52 . The package 50 has a recess 2 , and part of the upper surfaces of the first lead 51 and the second lead 52 are located on the bottom surface of the recess 2 .

図１Ａおよび図１Ｂに示すパッケージ５０は、上面８０ａおよび上面８０ａと反対側に位置する下面８０ｂとを有している。また、パッケージ５０は、上面視において略矩形の外形形状を有し、第１外側面８１、第１外側面８１と反対側に位置する第２外側面８２、第３外側面８３、および第３外側面８３と反対側に位置する第４外側面８４を有する。パッケージ５０は、外側面において、第１リード５１および第２リード５２が樹脂部３０から外側に延出しないことが好ましい。図１Ｂでは、第３外側面８３において、第１リード５１が樹脂部３０から露出し、かつ、第１リード５１と樹脂部３０とが略同一面になっている。また、第４外側面８４において、第２リード５２が樹脂部３０から露出し、かつ、第２リード５２と樹脂部３０とが略同一面になっている。同様に、第１外側面８１および第２外側面８２においても、リードと樹脂部とが略同一面になっていることが好ましい。これにより、占有面積の小さい小型の発光装置１００を提供することができる。 The package 50 shown in FIGS. 1A and 1B has a top surface 80a and a bottom surface 80b opposite the top surface 80a. The package 50 has a substantially rectangular outer shape when viewed from above, and includes a first outer surface 81 , a second outer surface 82 opposite to the first outer surface 81 , a third outer surface 83 , and a third outer surface 83 . It has a fourth outer surface 84 located opposite the outer surface 83 . It is preferable that the first lead 51 and the second lead 52 not extend outward from the resin portion 30 on the outer surface of the package 50 . In FIG. 1B, the first lead 51 is exposed from the resin portion 30 on the third outer surface 83, and the first lead 51 and the resin portion 30 are substantially flush with each other. Further, the second lead 52 is exposed from the resin portion 30 on the fourth outer surface 84, and the second lead 52 and the resin portion 30 are substantially flush with each other. Similarly, on the first outer surface 81 and the second outer surface 82, it is preferable that the leads and the resin portion are substantially flush with each other. Accordingly, it is possible to provide a compact light emitting device 100 that occupies a small area.

パッケージ５０の下面８０ｂは、発光装置１００を実装基板に実装する実装面として機能する。また、パッケージ５０の下面８０ｂにおいて、第１リード５１および第２リード５２は、樹脂部３０から露出している。これにより、発光素子から発生する熱を、パッケージ５０の下面８０ｂから効率的に放熱することができる。また、パッケージ５０の下面８０ｂにおいて、第１リード５１および第２リード５２の下面と樹脂部３０の下面とは略同一面になっている。 A lower surface 80b of the package 50 functions as a mounting surface for mounting the light emitting device 100 on a mounting substrate. Also, the first lead 51 and the second lead 52 are exposed from the resin portion 30 on the lower surface 80 b of the package 50 . Thereby, heat generated from the light emitting element can be efficiently radiated from the lower surface 80 b of the package 50 . Further, on the lower surface 80b of the package 50, the lower surfaces of the first leads 51 and the second leads 52 and the lower surface of the resin portion 30 are substantially flush with each other.

以下、本発明の発光装置１００に用いられる各部材について詳細に説明する。 Each member used in the light emitting device 100 of the present invention will be described in detail below.

（第１発光素子、第２発光素子）
第１発光素子１０および第２発光素子２０には、発光ダイオード素子などを用いることができ、可視域の発光が可能な窒化物半導体（ＩｎｘＡｌｙＧａ１－ｘ－ｙＮ、０≦ｘ、０≦ｙ、ｘ＋ｙ≦１）を好適に用いることができる。第１発光素子１０および第２発光素子２０のそれぞれの個数は目的や用途に応じて変更可能である。各発光素子は、正負電極を有する電極形成面を上側にして載置される発光素子でもよく、または、電極形成面を下側にして載置される発光素子でもよい。複数の発光素子は直列、並列または直列と並列の組み合わせで電気的に接続される。 (First Light Emitting Element, Second Light Emitting Element)
A light-emitting diode element or the like can be used for the first light-emitting element 10 and the second light-emitting element 20, and a nitride semiconductor (In x Al y Ga 1-x-y N, 0≦x , 0≦y, x+y≦1) can be preferably used. The respective numbers of the first light emitting elements 10 and the second light emitting elements 20 can be changed according to the purpose and application. Each light-emitting element may be a light-emitting element that is placed with the electrode-forming surface having the positive and negative electrodes facing upward, or may be a light-emitting element that is placed with the electrode-forming surface facing downward. The plurality of light emitting elements are electrically connected in series, parallel or a combination of series and parallel.

（第１透光性部材、封止部材）
第１透光性部材１５および封止部材４０は、樹脂材料を固体化した樹脂部材等を用いることができる。樹脂材料としては、熱硬化性樹脂や熱可塑性樹脂を用いることができる。具体的には、エポキシ樹脂組成物、シリコーン樹脂組成物、シリコーン変性エポキシ樹脂などの変性エポキシ樹脂組成物、エポキシ変性シリコーン樹脂などの変性シリコーン樹脂組成物、変成シリコーン樹脂組成物、不飽和ポリエステル樹脂、飽和ポリエステル樹脂、ポリイミド樹脂組成物、変性ポリイミド樹脂組成物等の硬化体、ポリフタルアミド（ＰＰＡ）、ポリカーボネート樹脂、ポリフェニレンサルファイド（ＰＰＳ）、液晶ポリマー（ＬＣＰ）、ＡＢＳ樹脂、フェノール樹脂、アクリル樹脂、ＰＢＴ樹脂等の樹脂を用いることができる。特に、第１透光性部材１５および封止部材４０の樹脂材料として、耐熱性および耐光性に優れたシリコーン樹脂組成物の熱硬化性樹脂を用いることが好ましい。第１透光性部材１５および封止部材４０の全てが、シリコーン樹脂組成物からなることが好ましい。これにより、第１透光性部材１５および封止部材４０の耐光性が高くなるため、発光素子からの光による光劣化を効果的に抑制することができ、信頼性の高い発光装置とすることができる。 (First translucent member, sealing member)
For the first translucent member 15 and the sealing member 40, a resin member or the like obtained by solidifying a resin material can be used. A thermosetting resin or a thermoplastic resin can be used as the resin material. Specifically, epoxy resin compositions, silicone resin compositions, modified epoxy resin compositions such as silicone-modified epoxy resins, modified silicone resin compositions such as epoxy-modified silicone resins, modified silicone resin compositions, unsaturated polyester resins, Cured products such as saturated polyester resin, polyimide resin composition, modified polyimide resin composition, polyphthalamide (PPA), polycarbonate resin, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), ABS resin, phenolic resin, acrylic resin, A resin such as PBT resin can be used. In particular, as the resin material for the first translucent member 15 and the sealing member 40, it is preferable to use a thermosetting resin of a silicone resin composition that is excellent in heat resistance and light resistance. All of the first translucent member 15 and the sealing member 40 are preferably made of a silicone resin composition. As a result, the light resistance of the first light-transmitting member 15 and the sealing member 40 is increased, so that photodegradation due to light from the light emitting element can be effectively suppressed, and a highly reliable light emitting device can be obtained. can be done.

第１透光性部材１５および封止部材４０は、光散乱材を含有することができる。光散乱材としては、例えば、酸化チタン、酸化亜鉛、酸化ケイ素、酸化ジルコニウム、酸化アルミニウム、窒化アルミニウム等を用いることができる。 The first translucent member 15 and the sealing member 40 can contain a light scattering material. Examples of light scattering materials that can be used include titanium oxide, zinc oxide, silicon oxide, zirconium oxide, aluminum oxide, and aluminum nitride.

（第１蛍光体、第２蛍光体）
第１透光性部材１５は第１蛍光体６１を含み、封止部材４０は第２蛍光体６２を含む。第１蛍光体６１および第２蛍光体６２は、１種の蛍光体であってもよく、また複数種の蛍光体であってもよい。第１蛍光体６１および第２蛍光体６２は、発光素子の光で励起する蛍光体であればよい。第１蛍光体６１および第２蛍光体６２は、例えば、（Ｃａ,Ｓｒ,Ｂａ）５（ＰＯ４）３（Ｃｌ，Ｂｒ）：Ｅｕ、（Ｓｒ，Ｃａ，Ｂａ）４Ａｌ１４Ｏ２５：Ｅｕ、（Ｃａ，Ｓｒ，Ｂａ）８ＭｇＳｉ４Ｏ１６（Ｆ，Ｃｌ，Ｂｒ）２：Ｅｕ、（Ｙ，Ｌｕ，Ｇｄ）３（Ａｌ，Ｇａ）５Ｏ１２：Ｃｅ、（Ｓｒ，Ｃａ）ＡｌＳｉＮ３：Ｅｕ、３．５ＭｇＯ・０．５ＭｇＦ２・ＧｅＯ２：Ｍｎ、（ｘ-ｓ）ＭｇＯ・（ｓ/２）Ｓｃ２Ｏ３・ｙＭｇＦ２・ｕＣａＦ２・（１-ｔ）ＧｅＯ２・（ｔ/２）Ｍｔ ２Ｏ３：ｚＭｎ、Ｃａ３Ｓｃ２Ｓｉ３Ｏ１２：Ｃｅ、ＣａＳｃ２Ｏ４：Ｃｅ、（Ｌａ，Ｙ）３Ｓｉ６Ｎ１１：Ｃｅ、（Ｃａ，Ｓｒ，Ｂａ）３Ｓｉ６Ｏ９Ｎ４：Ｅｕ、（Ｃａ，Ｓｒ，Ｂａ）３Ｓｉ６Ｏ１２Ｎ２：Ｅｕ、（Ｂａ，Ｓｒ，Ｃａ)Ｓｉ２Ｏ２Ｎ２：Ｅｕ、（Ｃａ，Ｓｒ，Ｂａ）２Ｓｉ５Ｎ８：Ｅｕ、（Ｃａ，Ｓｒ，Ｂａ）Ｓ：Ｅｕ、（Ｂａ，Ｓｒ，Ｃａ）Ｇａ２Ｓ４：Ｅｕ、Ｋ２（Ｓｉ，Ｔｉ，Ｇｅ）Ｆ６：Ｍｎの蛍光体を用いることができる。 (First phosphor, second phosphor)
The first translucent member 15 contains a first phosphor 61 and the sealing member 40 contains a second phosphor 62 . The first phosphor 61 and the second phosphor 62 may be one type of phosphor, or may be a plurality of types of phosphors. The first phosphor 61 and the second phosphor 62 may be phosphors that are excited by the light from the light emitting element. The first phosphor 61 and the second phosphor 62 are, for example, (Ca, Sr, Ba) 5 (PO 4 ) 3 (Cl, Br):Eu, (Sr, Ca, Ba) 4 Al 14 O 25 :Eu , (Ca, Sr, Ba) 8 MgSi 4 O 16 (F, Cl, Br) 2 : Eu, (Y, Lu, Gd) 3 (Al, Ga) 5 O 12 : Ce, (Sr, Ca) AlSiN 3 :Eu, 3.5MgO.0.5MgF2.GeO2 : Mn , (x-s)MgO.(s/2 ) Sc2O3.yMgF2.uCaF2 . (1-t)GeO2 . (t) / 2 ) Mt2O3 :zMn , Ca3Sc2Si3O12 : Ce , CaSc2O4 :Ce, (La,Y) 3Si6N11 :Ce , (Ca,Sr, Ba ) 3 Si6O9N4 : Eu, (Ca,Sr , Ba ) 3Si6O12N2 :Eu, (Ba , Sr , Ca ) Si2O2N2 :Eu, (Ca,Sr,Ba) 2 Phosphors of Si5N8 :Eu, (Ca,Sr,Ba ) S:Eu, (Ba,Sr,Ca) Ga2S4 :Eu, K2 (Si,Ti,Ge) F6 :Mn are used. be able to.

（樹脂部）
樹脂部３０は、母材となる樹脂材料として、熱硬化性樹脂、熱可塑性樹脂を用いることができる。具体的には、エポキシ樹脂組成物、シリコーン樹脂組成物、シリコーン変性エポキシ樹脂などの変性エポキシ樹脂組成物、エポキシ変性シリコーン樹脂などの変性シリコーン樹脂組成物、変成シリコーン樹脂組成物、不飽和ポリエステル樹脂、飽和ポリエステル樹脂、ポリイミド樹脂組成物、変性ポリイミド樹脂組成物等の硬化体、ポリフタルアミド（ＰＰＡ）、ポリカーボネート樹脂、ポリフェニレンサルファイド（ＰＰＳ）、液晶ポリマー（ＬＣＰ）、ＡＢＳ樹脂、フェノール樹脂、アクリル樹脂、ＰＢＴ樹脂等の樹脂を用いることができる。特に、樹脂部３０の樹脂材料として、耐熱性および耐光性に優れたエポキシ樹脂組成物やシリコーン樹脂組成物の熱硬化性樹脂を用いることが好ましい。 (Resin part)
The resin portion 30 can use a thermosetting resin or a thermoplastic resin as a resin material serving as a base material. Specifically, epoxy resin compositions, silicone resin compositions, modified epoxy resin compositions such as silicone-modified epoxy resins, modified silicone resin compositions such as epoxy-modified silicone resins, modified silicone resin compositions, unsaturated polyester resins, Cured products such as saturated polyester resin, polyimide resin composition, modified polyimide resin composition, polyphthalamide (PPA), polycarbonate resin, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), ABS resin, phenolic resin, acrylic resin, A resin such as PBT resin can be used. In particular, as the resin material of the resin portion 30, it is preferable to use a thermosetting resin such as an epoxy resin composition or a silicone resin composition having excellent heat resistance and light resistance.

樹脂部３０は、上記の母材となる樹脂材料に、光反射性物質を含有させたものを用いることが好ましい。光反射性物質としては、発光素子からの光を吸収しにくく、且つ、母材となる樹脂材料に対して屈折率差の大きい部材を用いることが好ましい。このような光反射性物質は、例えば、酸化チタン、酸化亜鉛、酸化ケイ素、酸化ジルコニウム、酸化アルミニウム、窒化アルミニウム等である。 The resin portion 30 is preferably made of the above-described base resin material containing a light-reflecting substance. As the light-reflecting substance, it is preferable to use a member that hardly absorbs light from the light-emitting element and that has a large difference in refractive index with respect to the resin material serving as the base material. Such light-reflecting substances are, for example, titanium oxide, zinc oxide, silicon oxide, zirconium oxide, aluminum oxide, aluminum nitride and the like.

また、樹脂部３０は、発光装置１００のコントラストを向上させるために、発光装置１００の外光（多くの場合、太陽光）に対して光反射率が低い充填剤を含有してもよい。この場合、樹脂部３０は、例えば、黒色ないしそれに近似した色である。充填剤としては、アセチレンブラック、活性炭、黒鉛などのカーボンや、酸化鉄、二酸化マンガン、酸化コバルト、酸化モリブデンなどの遷移金属酸化物、もしくは有色有機顔料などを目的に応じて利用することができる。 Moreover, in order to improve the contrast of the light emitting device 100 , the resin portion 30 may contain a filler having a low light reflectance with respect to external light (sunlight in many cases) of the light emitting device 100 . In this case, the resin portion 30 is, for example, black or a color similar thereto. As the filler, 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 can be used depending on the purpose.

（第１リード、第２リード）
第１リード５１および第２リード５２は、導電性を有し、発光素子に給電するための電極として機能する。第１リード５１および第２リード５２は、母材として、例えば、銅、アルミニウム、金、銀、鉄、ニッケル、又はこれらの合金、燐青銅、鉄入り銅などの金属を用いることができる。これらは単層であってもよいし、積層構造（例えば、クラッド材）であってもよい。特に、母材には安価で放熱性が高い銅を用いることが好ましい。また、第１リード５１および第２リード５２は、表面に銀含有層を備えることができる。また、第１リード５１および第２リード５２は、母材と銀含有層との間に中間層を有することができる。中間層は、例えば、アルミニウム、ニッケル、パラジウム、ロジウム、金、銅、又はこれらの合金などを含む。なお、銀含有層または中間層は、第１リード５１および第２リード５２の全面に設けられていてもよく、また部分的に設けられていてもよい。また、リードの上面側に形成される銀含有層または中間層は、リードの下面側に形成される銀含有層または中間層よりも厚くすることができる。 (1st lead, 2nd lead)
The first lead 51 and the second lead 52 are conductive and function as electrodes for supplying power to the light emitting element. The base material of the first lead 51 and the second lead 52 can be metal such as copper, aluminum, gold, silver, iron, nickel, alloys thereof, phosphor bronze, iron-containing copper, or the like. These may be single layers or laminated structures (for example, clad materials). In particular, it is preferable to use copper, which is inexpensive and has high heat dissipation, as the base material. Also, the first lead 51 and the second lead 52 can have a silver-containing layer on their surface. Also, the first lead 51 and the second lead 52 can have an intermediate layer between the base material and the silver-containing layer. The intermediate layer contains, for example, aluminum, nickel, palladium, rhodium, gold, copper, or alloys thereof. The silver-containing layer or intermediate layer may be provided over the entire surface of first lead 51 and second lead 52, or may be provided partially. Also, the silver-containing layer or intermediate layer formed on the upper surface side of the lead can be thicker than the silver-containing layer or intermediate layer formed on the lower surface side of the lead.

第１リード５１および第２リード５２の最表面（例えば、銀含有層の表面）には、酸化ケイ素等の保護層を設けることができる。銀含有層の表面に保護層を設けることで、例えば、凹部２内に硫黄等が進入した場合に、銀含有層の劣化の進行を保護層によって効果的に阻害することができる。保護層の成膜方法は、例えばスパッタ等の真空プロセスによって成膜することができる。 A protective layer such as silicon oxide can be provided on the outermost surface of the first lead 51 and the second lead 52 (for example, the surface of the silver-containing layer). By providing the protective layer on the surface of the silver-containing layer, for example, when sulfur or the like enters the recesses 2, the progress of deterioration of the silver-containing layer can be effectively inhibited by the protective layer. The protective layer can be formed by a vacuum process such as sputtering, for example.

パッケージ５０は、少なくとも第１リード５１、第２リード５２を備えていればよい。パッケージ５０は、３つ以上のリードを備えていてもよく、例えば、第１リード５１および第２リード５２に加えて第３リードを備えることができる。第３リードは、放熱部材として機能してもよく、また第１リード５１等と同様に電極として機能してもよい。 The package 50 should have at least the first lead 51 and the second lead 52 . The package 50 may have more than two leads, for example, a third lead in addition to the first lead 51 and the second lead 52 . The third lead may function as a heat radiating member, or may function as an electrode like the first lead 51 and the like.

１００ 発光装置
５０ パッケージ
１０ 第１発光素子
１０ａ 第１素子群
２０ 第２発光素子
２０ａ 第２素子群
１５ 第１透光性部材
２ 凹部
３０ 樹脂部
５１ 第１リード
５２ 第２リード
６１ 第１蛍光体
６２ 第２蛍光体
８０ａ 上面
８０ｂ 下面
８１ 第１外側面
８２ 第２外側面
８３ 第３外側面
８４ 第４外側面
９ 凸部 REFERENCE SIGNS LIST 100 light emitting device 50 package 10 first light emitting element 10a first element group 20 second light emitting element 20a second element group 15 first translucent member 2 concave portion 30 resin portion 51 first lead 52 second lead 61 first phosphor 62 Second phosphor 80a Upper surface 80b Lower surface 81 First outer surface 82 Second outer surface 83 Third outer surface 84 Fourth outer surface 9 Projection

Claims (11)

複数の第１発光素子と、
前記第１発光素子の上面上に位置し、前記第１発光素子の側面を露出し、第１蛍光体を含む樹脂からなる第１透光性部材と、
前記複数の第１発光素子の個数より少なく、上面上に前記第１透光性部材が位置しない複数の第２発光素子と、
前記複数の第１発光素子、前記複数の第２発光素子および前記複数の第１透光性部材を被覆し、前記第１蛍光体が発する光よりも短波長の光を発する第２蛍光体を含む封止部材と、を備え、
前記封止部材の上面は、前記第１透光性部材の上方において凸部を有し、前記第２発光素子の上方において凸部を有さない発光装置。 a plurality of first light emitting elements;
a first translucent member positioned on the upper surface of the first light emitting element, exposing the side surface of the first light emitting element, and made of a resin containing a first phosphor;
a plurality of second light emitting elements that are less in number than the plurality of first light emitting elements and do not have the first translucent member positioned on an upper surface thereof;
a second phosphor covering the plurality of first light emitting elements, the plurality of second light emitting elements and the plurality of first translucent members and emitting light having a shorter wavelength than the light emitted by the first phosphor a sealing member including ;
The light emitting device, wherein the upper surface of the sealing member has a convex portion above the first translucent member and does not have a convex portion above the second light emitting element. 前記第１蛍光体の含有量は、前記第１透光性部材の全重量に対して９重量％～５７重量％である、請求項１に記載の発光装置。 The light emitting device according to claim 1, wherein the content of the first phosphor is 9 wt% to 57 wt% with respect to the total weight of the first translucent member. 前記第１発光素子および前記第２発光素子のそれぞれは、発光ピーク波長が４３０ｎｍ～４８０ｎｍの発光素子である、請求項１または２に記載の発光装置。 3. The light-emitting device according to claim 1, wherein each of said first light-emitting element and said second light-emitting element is a light-emitting element having an emission peak wavelength of 430 nm to 480 nm. 前記発光装置は、第１方向に２つ以上の前記第１発光素子が配列された２つの第１素子群と、前記第１方向に２つ以上の前記第２発光素子が配列された第２素子群とを有し、前記第２素子群は、前記２つの第１素子群の間に配置されている、請求項１～３のいずれか１項に記載の発光装置。 The light emitting device includes two first element groups in which two or more of the first light emitting elements are arranged in a first direction, and a second element group in which two or more of the second light emitting elements are arranged in the first direction. 4. The light-emitting device according to claim 1, further comprising: an element group, wherein said second element group is arranged between said two first element groups. 前記発光装置は、上側から見た外形が矩形状であり、凹部を有するパッケージを備え、
前記複数の第１発光素子および前記複数の第２発光素子は、前記凹部の底面に配置されている、請求項１～４のいずれか１項に記載の発光装置。 The light emitting device has a rectangular outer shape when viewed from above and includes a package having a recess,
5. The light emitting device according to claim 1, wherein said plurality of first light emitting elements and said plurality of second light emitting elements are arranged on the bottom surface of said recess. 前記第１発光素子および前記第２発光素子のそれぞれは、上側から見た外形が矩形状であり、
前記第１発光素子および前記第２発光素子は、上面視において、前記第１発光素子および前記第２発光素子それぞれの辺が前記凹部の一の内側面に対して傾斜して配置されている、請求項５に記載の発光装置。 each of the first light emitting element and the second light emitting element has a rectangular outer shape when viewed from above;
The first light emitting element and the second light emitting element are arranged such that each side of the first light emitting element and the second light emitting element is inclined with respect to one inner side surface of the recess when viewed from above, The light emitting device according to claim 5. 前記第１発光素子の発光ピーク波長と前記第２発光素子の発光ピーク波長との波長差は５ｎｍより大きい、請求項１～６のいずれか１項に記載の発光装置。The light-emitting device according to any one of claims 1 to 6, wherein a wavelength difference between the peak emission wavelength of said first light-emitting element and the peak emission wavelength of said second light-emitting element is greater than 5 nm. 前記第１発光素子と前記第２発光素子との離隔距離は、隣接する前記第１発光素子間の離隔距離および隣接する前記第２発光素子間の離隔距離よりも大きい、請求項１～７のいずれか１項に記載の発光装置。The separation distance between the first light emitting element and the second light emitting element is larger than the separation distance between the adjacent first light emitting elements and the separation distance between the adjacent second light emitting elements. The light-emitting device according to any one of items 1 and 2. 前記複数の第１発光素子の個数は、前記複数の第２発光素子の個数の１．２倍以上の整数で表される個数である、請求項１～８のいずれか１項に記載の発光装置。The light emission according to any one of claims 1 to 8, wherein the number of the plurality of first light emitting elements is a number represented by an integer equal to or greater than 1.2 times the number of the plurality of second light emitting elements. Device. 前記第１透光性部材の上面は、湾曲面である、請求項１～９のいずれか１項に記載の発光装置。The light-emitting device according to any one of claims 1 to 9, wherein the upper surface of said first translucent member is a curved surface. 前記封止部材の母材となる樹脂材料の屈折率は、前記第１透光性部材の母材となる樹脂材料の屈折率よりも高く、 the refractive index of the resin material serving as the base material of the sealing member is higher than the refractive index of the resin material serving as the base material of the first translucent member;
前記封止部材の母材となる樹脂材料の屈折率と、前記第１透光性部材の母材となる樹脂材料の屈折率と、の屈折率差は０より大きく０．２以下である、請求項１～１０のいずれか１項に記載の発光装置。 The refractive index difference between the resin material that is the base material of the sealing member and the refractive index of the resin material that is the base material of the first translucent member is greater than 0 and not more than 0.2. The light-emitting device according to any one of claims 1-10.
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