JP2009158638A - Light-emitting device - Google Patents

Light-emitting device Download PDF

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Publication number
JP2009158638A
JP2009158638A JP2007333618A JP2007333618A JP2009158638A JP 2009158638 A JP2009158638 A JP 2009158638A JP 2007333618 A JP2007333618 A JP 2007333618A JP 2007333618 A JP2007333618 A JP 2007333618A JP 2009158638 A JP2009158638 A JP 2009158638A
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Japan
Prior art keywords
light emitting
light
layer
emitting device
emitting element
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Withdrawn
Application number
JP2007333618A
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Japanese (ja)
Inventor
Kazuhiro Kawabata
和弘 川畑
Tamio Kusano
民男 草野
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Kyocera Corp
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Kyocera Corp
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Priority to JP2007333618A priority Critical patent/JP2009158638A/en
Publication of JP2009158638A publication Critical patent/JP2009158638A/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched

Abstract

<P>PROBLEM TO BE SOLVED: To reduce uneven light emission of a light-emitting member. <P>SOLUTION: A light-emitting device 1 has a light-emitting element 13, a translucent member 14, and the light-emitting member 15. The translucent member 14 is provided on the light-emitting element 11 and has a first layer 14-1 and a second layer 14-2. The second layer 14-2 is provided on the first layer 14-1 and has a refractive index smaller than that of the first layer 14-1. The light-emitting member 15 covers the translucent member 14 and has a fluorescent material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えば発光ダイオードなどの発光素子を有する発光装置に関するものである。   The present invention relates to a light emitting device having a light emitting element such as a light emitting diode.

近年、照明分野などにおいて、発光ダイオードなどの発光素子を有する発光装置の開発が進められている。この発光装置は、発光素子によって発生された光の波長を変換する発光部材を有している。今後、発光装置において、発光効率のさらなる向上が求められている。
特開２００５−２２８９９６号公報 In recent years, development of light emitting devices having light emitting elements such as light emitting diodes has been promoted in the field of illumination and the like. The light emitting device includes a light emitting member that converts the wavelength of light generated by the light emitting element. In the future, further improvement in light emission efficiency is required in light emitting devices.
JP 2005-228996 A

発光装置における発光効率を向上させるためには、蛍光材料を含んでいる発光部材における発光むらを低減させる必要がある。   In order to improve the light emission efficiency of the light emitting device, it is necessary to reduce unevenness of light emission in the light emitting member containing the fluorescent material.

本発明の一つの態様によれば、発光装置は、発光素子、透光性部材および発光部材を有している。透光性部材は、発光素子上に設けられており、第１の層および第２の層を有している。第２の層は、第１の層上に設けられており、第１の層より屈折率が小さい。発光部材は、透光性部材を覆っており、蛍光材料を有している。   According to one embodiment of the present invention, a light emitting device includes a light emitting element, a light transmissive member, and a light emitting member. The translucent member is provided on the light emitting element and has a first layer and a second layer. The second layer is provided on the first layer and has a refractive index smaller than that of the first layer. The light emitting member covers the translucent member and has a fluorescent material.

本発明の一つの態様によれば、発光装置は、第１の層と第１の層より屈折率の小さい第２の層とからなる透光性部材を有していることにより、発光部材における発光むらが低減されている。   According to one aspect of the present invention, the light-emitting device includes the light-transmitting member including the first layer and the second layer having a refractive index smaller than that of the first layer. Uneven light emission is reduced.

以下、本発明の実施形態が図面を参照して説明されている。本実施形態の照明装置１００が、図１を参照して説明されている。照明装置１００は、複数の発光装置１、基板２およびカバー３を有している。複数の発光装置１は、基板２上に実装されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. An illumination device 100 according to this embodiment is described with reference to FIG. The lighting device 100 includes a plurality of light emitting devices 1, a substrate 2, and a cover 3. The plurality of light emitting devices 1 are mounted on the substrate 2.

発光装置１が、図２を参照して説明されている。発光装置１は、基体１１、サブマウント１２および発光素子１３を有している。発光装置１は、透光性部材１４および発光部材１５をさらに有している。   The light emitting device 1 is described with reference to FIG. The light emitting device 1 includes a base 11, a submount 12 and a light emitting element 13. The light emitting device 1 further includes a light transmissive member 14 and a light emitting member 15.

基体１１は、金属材料からなる。金属材料の例は、銅（Ｃｕ）である。絶縁層１７が、基体１１上に形成されている。導体パターン１６が、絶縁層１７上に形成されている。サブマウント１２は、基体１１上に設けられている。サブマウント１２は、セラミックスからなる。   The base 11 is made of a metal material. An example of the metal material is copper (Cu). An insulating layer 17 is formed on the substrate 11. A conductor pattern 16 is formed on the insulating layer 17. The submount 12 is provided on the base 11. The submount 12 is made of ceramics.

発光素子１３は、サブマウント１２上に実装されており、導体パターン１６に電気的に接続されている。発光素子１３は、半導体材料からなる発光ダイオードである。発光素子１３は、駆動電力に応じて第１の光を放射する。第１の光は、青色光または紫外光である。   The light emitting element 13 is mounted on the submount 12 and is electrically connected to the conductor pattern 16. The light emitting element 13 is a light emitting diode made of a semiconductor material. The light emitting element 13 emits the first light according to the driving power. The first light is blue light or ultraviolet light.

透光性部材１４は、発光素子１３上に設けられている。透光性とは、発光素子１３から放射された光の波長の少なくとも一部が透過することをいう。透光性部材１４は、シリコーン樹脂からなる。透光性部材１４は、ドーム形状を有している。透光性部材１４は、第１の層１４−１および第２の層１４−２を有している。第２の層１４−２は、第１の層１４−１上に設けられており、第１の層１４−１の屈折率より小さい屈折率を有している。第１の層１４−１および第２の層１４−２の界面は平坦である。   The translucent member 14 is provided on the light emitting element 13. Translucency means that at least part of the wavelength of light emitted from the light emitting element 13 is transmitted. The translucent member 14 is made of a silicone resin. The translucent member 14 has a dome shape. The translucent member 14 includes a first layer 14-1 and a second layer 14-2. The second layer 14-2 is provided on the first layer 14-1, and has a refractive index smaller than that of the first layer 14-1. The interface between the first layer 14-1 and the second layer 14-2 is flat.

発光部材１５は、透光性部材１４を覆っている。発光部材１５は、透光性部材１４の第１の層１４−１を囲んでいる。発光部材１５は、第１の層１４−１および第２の層１４−２の界面を囲んでいる。発光部材１５は、ドーム形状を有している。発光部材１５は、透光性のベース材料および蛍光材料を含んでいる。ベース材料の透光性とは、発光素子１３から放射された光の波長の少なくとも一部が透過することをいう。ベース材料の例は、シリコーン樹脂である。蛍光材料は、発光素子１３から放射された第１の光によって励起される。発光部材１５は、第１の光に応じて第２の光を放射する。   The light emitting member 15 covers the translucent member 14. The light emitting member 15 surrounds the first layer 14-1 of the translucent member 14. The light emitting member 15 surrounds the interface between the first layer 14-1 and the second layer 14-2. The light emitting member 15 has a dome shape. The light emitting member 15 includes a translucent base material and a fluorescent material. The translucency of the base material means that at least a part of the wavelength of light emitted from the light emitting element 13 is transmitted. An example of the base material is a silicone resin. The fluorescent material is excited by the first light emitted from the light emitting element 13. The light emitting member 15 emits second light in response to the first light.

発光装置１における発光構造が、図４を参照して説明されている。発光素子１３から放射された光の一部Ｌ１３−１は、第１の層１４−１および第２の層１４−２の界面において全反射される。図５に示されているように、第１の層１４−１および第２の層１４−２の界面に対して臨界角以上の角度によって入射された光が、界面において全反射される。臨界角θは、第１の層１４−１の屈折率をｎ１として、第２の層１４−２の屈折率をｎ２とした場合、次の式を満たす。   The light emitting structure in the light emitting device 1 is described with reference to FIG. A portion L13-1 of the light emitted from the light emitting element 13 is totally reflected at the interface between the first layer 14-1 and the second layer 14-2. As shown in FIG. 5, light incident at an angle greater than the critical angle with respect to the interface between the first layer 14-1 and the second layer 14-2 is totally reflected at the interface. The critical angle θ satisfies the following expression when the refractive index of the first layer 14-1 is n1 and the refractive index of the second layer 14-2 is n2.

ｓｉｎθ＝ｎ２／ｎ１
光Ｌ１３−１は、発光部材１５の下部に進む。発光素子１３から放射された光の他の一部Ｌ１３−２は、第２の層１４−２を透過して、発光部材１５の上部へ進む。発光部材１５は、光Ｌ１３−１およびＬ１３−２によって第２の光を放射する。本実施形態の発光装置１は、第１の層１４−１および第２の層１４−２の界面を有していることにより、発光部材１５における発光むらが低減されている。 sin θ = n2 / n1
The light L13-1 travels to the lower part of the light emitting member 15. The other part L13-2 of the light emitted from the light emitting element 13 passes through the second layer 14-2 and proceeds to the upper part of the light emitting member 15. The light emitting member 15 emits the second light by the lights L13-1 and L13-2. The light emitting device 1 of the present embodiment has the interface between the first layer 14-1 and the second layer 14-2, so that the light emission unevenness in the light emitting member 15 is reduced.

本発明の実施形態の照明装置１００を示している。1 shows an illumination device 100 according to an embodiment of the present invention. 図１に示された発光装置１を示している。The light-emitting device 1 shown by FIG. 1 is shown. 図１のIII−III’における縦断面を示している。Fig. 3 shows a longitudinal section taken along line III-III 'in Fig. 1. 図３に示された発光装置１における発光構造を示している。4 shows a light emitting structure in the light emitting device 1 shown in FIG. 3. 図４に示された光の全反射を示している。5 shows the total reflection of the light shown in FIG.

符号の説明Explanation of symbols

１ 発光装置
１１ 基体
１２ サブマウント
１３ 発光素子
１４ 透光性部材
１５ 発光部材 DESCRIPTION OF SYMBOLS 1 Light-emitting device 11 Base | substrate 12 Submount 13 Light-emitting element 14 Translucent member 15 Light-emitting member

Claims (6)

発光素子と、
前記発光素子上に設けられており、第１の層と前記第１の層上に設けられており前記第１の層より屈折率の小さい第２の層とを有している透光性部材と、
前記第１の層を囲こむように前記透光性部材を覆っており、蛍光材料を有している発光部材と、
を備えた発光装置。 A light emitting element;
A translucent member provided on the light-emitting element and having a first layer and a second layer having a refractive index lower than that of the first layer provided on the first layer When,
A light-emitting member covering the translucent member so as to surround the first layer and having a fluorescent material;
A light emitting device comprising: 前記発光部材がドーム形状を有していることを特徴とする請求項１記載の発光装置。   The light emitting device according to claim 1, wherein the light emitting member has a dome shape. 前記透光性部材がドーム形状を有していることを特徴とする請求項２記載の発光装置。   The light-emitting device according to claim 2, wherein the translucent member has a dome shape. 前記第１の層および前記第２の層の界面が平坦であることを特徴とする請求項１記載の発光装置。   The light emitting device according to claim 1, wherein an interface between the first layer and the second layer is flat. 前記発光部材が、前記界面を囲んでいることを特徴とする請求項４記載の発光装置。   The light emitting device according to claim 4, wherein the light emitting member surrounds the interface. 前記発光部材がドーム形状を有していることを特徴とする請求項５記載の発光装置。   The light emitting device according to claim 5, wherein the light emitting member has a dome shape.
JP2007333618A 2007-12-26 2007-12-26 Light-emitting device Withdrawn JP2009158638A (en)

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JP2007333618A JP2009158638A (en) 2007-12-26 2007-12-26 Light-emitting device

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JP2007333618A JP2009158638A (en) 2007-12-26 2007-12-26 Light-emitting device

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