JP2016018912A - 発光装置及びその製造方法 - Google Patents
発光装置及びその製造方法 Download PDFInfo
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- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/54—Encapsulations having a particular shape
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- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/20—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular shape, e.g. curved or truncated substrate
- H01L33/24—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular shape, e.g. curved or truncated substrate of the light emitting region, e.g. non-planar junction
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- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
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- H01L2224/14—Structure, shape, material or disposition of the bump connectors prior to the connecting process of a plurality of bump connectors
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Abstract
【解決手段】基板と、基板上に配置される発光素子と、発光素子と基板との間に配置される絶縁性の樹脂部材と、を有し、樹脂部材は、少なくとも第1樹脂部材と、第1樹脂部材と異なる領域に設けられる第2樹脂部材と、を有し、第1樹脂部材は、第2樹脂部材と、硬さが異なり、第1樹脂部材上の発光素子上面の高さと、第2樹脂部材上の発光素子の高さとが異なる発光装置。
【選択図】図1
Description
1.発光装置100の構成
実施形態に係る発光装置100の構成について、図面を参照しながら説明する。図1は、発光装置100の構成を示す断面図である。
基板10は、発光装置の母材となるものであり、基板本体11と、n側配線電極12と、p側配線電極13と、を有する。
基板10の形状は特に限定されず基板本体11の形状に相当する形状となる。例えば、円形、四角形等の多角形又はこれらに近い形状が挙げられる。
基板10の厚みは、基板本体11の厚みによって調整することができる。例えば、最も厚い部位の厚みは、1000μm程度以下が好ましく、500μm程度以下がより好ましい。また、40μm程度以上が好ましい。
基板本体11は、例えば、金属、セラミック、樹脂、誘電体、パルプ、ガラス、紙又はこれらの複合材料(例えば、複合樹脂)、あるいはこれら材料と導電材料(例えば、金属、カーボン等)との複合材料等が挙げられる。金属としては、銅、鉄、ニッケル、クロム、アルミニウム、銀、金、チタン又はこれらの合金を含むものが挙げられる。セラミックとしては、酸化アルミニウム、窒化アルミニウム、酸化ジルコニウム、窒化ジルコニウム、酸化チタン、窒化チタン又はこれらの混合物を含むものが挙げられる。複合樹脂としては、ガラスエポキシ樹脂等が挙げられる。樹脂としては、エポキシ樹脂、ビスマレイミドトリアジン(BT)樹脂、ポリイミド樹脂、シアネート樹脂、ポリビニルアセタール樹脂、フェノキシ樹脂、アクリル樹脂、アルキッド樹脂、ウレタン樹脂等が挙げられる。
n側配線電極12及びp側配線電極13は、基板10の上面10S上に配置される。n側配線電極12及びp側配線電極13は、それぞれ図示しない外部接続用の配線電極に接続されている。
発光素子20は、半導体層21と、半導体層21に形成されたp側電極及びn側電極(図示しない)と、を有する。本実施形態において、発光素子は、基板上に実装された後に、素子基板(サファイア等の成長基板)を除去したものであり、その素子基板の一部を、半導体層上に有していてもよい。また、後述のように、素子基板を備えた発光素子を基板に実装した後、素子基板側からレーザ光を照射することで基板を除去するため、素子基板としては、レーザ光が照射可能な透光性のものを用いる。
1つの発光装置に搭載される発光素子20は1つでもよいし、複数でもよい。発光素子20の大きさ、形状、発光波長は適宜選択することができる。複数の発光素子20が搭載される場合、その配置は不規則でもよく、行列など規則的又は周期的に配置されてもよい。複数の発光素子は、直列、並列、直並列又は並直列のいずれの接続形態でもよい。
樹脂部材30は、基板10と発光素子20との間に配置されるものであり、少なくとも硬さが異なる2種類の樹脂部材から構成される。実施形態1では、第1樹脂部材30aは、第2樹脂部材30bよりも、硬い樹脂であり、発光素子の中央の下に設けられる。第2樹脂部材30bは、第1樹脂部材30aよりも柔らかい樹脂であり、発光素子の周辺部の下に設けられる。また、第1樹脂部材の面積は、第2樹脂部材の面積の同等以下の面積とするのが好ましい。第1樹脂部材の面積が同等以下となることで、より曲率半径の小さい凸状形状となり、広配光化が可能となる。
樹脂部材30は、後述のサファイア基板50を除去(剥離)するプロセス中において、発光素子20の強度を向上させることができる。さらに発光装置全体の強度を確保することができる。封止部材を放熱性の高い材料で形成することによって、発光装置の小型化を維持したまま、放熱性を向上させることができる。
封止部材40は、発光素子や、発光素子の下に設けられる樹脂部材30、更に基板の上面等を覆う部材である。封止部材に、蛍光体が含まれている場合、このように発光素子20の出射面(上面)だけでなく、その周囲に設けられる樹脂部材30bの表面にも封止部材40が設けられることで、色ムラを低減することができる。また、蛍光体を含む封止部材40の上に、蛍光体を含まない封止部材(クリア層)があってもよい。
クリア層の形状は、特に限定されず、例えばレンズ形状であってもよい。
バンプB1、B2は、発光素子と基板とを電気的に接続させるとともに、発光素子を基板上に接合するための部材である。バンプの材料としては、例えば、Au、Cu、Alなどを用いることができる。バンプB1,B2は、p側配線電極とn側配線電極のそれぞれに複数個設けられることが好ましい。これにより、より安定して接続することができる。また、バンプB1、B2の高さは、数十μm程度である。
発光装置100の製造方法について、図面を参照しながら説明する。図2〜6は、発光装置100の製造方法を説明するための図である。
実施形態2では、第2樹脂部材30bが設けられ、その外側に第1樹脂部材30aを備える。第1樹脂部材30aは、第2樹脂部材30よりも、硬い樹脂であり、発光素子の周辺部の下に設けられる。第2樹脂部材30bは、第1樹脂部材30aよりも柔らかい樹脂であり、発光素子の中央の下に設けられる。また、第1樹脂部材30aの発光素子20上面の高さは、第2樹脂部材(樹脂部材30b)の発光素子20上面の高さに比べ、高い。つまり、発光素子20は、図7に示すように、凹形状となる。このような形状とすることで、発光素子の上面に高低差がない場合に比して、発光素子からの出射光の配向を狭くすることができる。
11…基板本体
12…n側配線電極
13…p側配線電極
B1、B2…バンプ
20…発光素子
20S…出射面
21…半導体層
30…樹脂部材
30a…第1樹脂部材
30b…第2樹脂部材
31…樹脂部材の頂部
40…封止部材
50…素子基板(サファイア基板)
100…発光装置
Claims (5)
- 基板と、
前記基板上に配置される発光素子と、
前記発光素子と前記基板との間に、配置される絶縁性の樹脂部材と、
を有し、
前記樹脂部材は、少なくとも第1樹脂部材と、該第1樹脂部材と異なる領域に設けられる第2樹脂部材と、を有し、
前記第1樹脂部材は、前記第2樹脂部材と、硬さが異なり、
前記第1樹脂部材上の前記発光素子上面の高さと、前記第2樹脂部材上の前記発光素子の高さとが異なる発光装置。 - 前記第1樹脂部材は、上面視において、前記発光素子の略中央に有し、前記第2樹脂部材は、前記第1樹脂部材よりも外側に設けられる請求項1記載の発光装置。
- 前記第1樹脂部材の面積は、前記第2樹脂部材と同等以下である、請求項1または2記載の発光装置。
- 前記第1樹脂部材は、前記第2樹脂部材よりも硬い請求項1〜3のいずれか1項に記載の発光装置。
- 前記第1樹脂部材は、前記第2樹脂部材よりも柔らかい請求項1〜3のいずれか1項に記載の発光装置。
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