JP6327220B2 - 発光装置 - Google Patents
発光装置 Download PDFInfo
- Publication number
- JP6327220B2 JP6327220B2 JP2015171430A JP2015171430A JP6327220B2 JP 6327220 B2 JP6327220 B2 JP 6327220B2 JP 2015171430 A JP2015171430 A JP 2015171430A JP 2015171430 A JP2015171430 A JP 2015171430A JP 6327220 B2 JP6327220 B2 JP 6327220B2
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- JP
- Japan
- Prior art keywords
- light emitting
- light
- emitting device
- translucent member
- emitting element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
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Description
図1Aは実施形態1に係る発光装置の模式的平面図であり、図1Bは図1A中のA−A断面図である。図1A、図1Bに示すように、実施形態1に係る発光装置100は、発光素子20と、平面視において発光素子20の上面28の周縁より内側に位置する下面32と、下面32に連なり発光素子20の上面28に対して傾斜する1つ以上の傾斜面を有する第1側面34と、第1側面34より上方且つ外側に位置する第2側面36と、を有する透光性部材30と、平面視において第2側面36より内側に位置し、発光素子20の上面28と透光性部材30の下面32とを接着するとともに、第1側面34を覆う透光性の接着部材40と、第2側面36を覆う光反射性部材50と、を備えた発光装置である。以下、詳細に説明する。
発光素子20には発光ダイオードを用いることができる。発光ダイオードとしては、例えば、成長基板上に発光層を含む積層構造が形成された発光ダイオードを用いることができる。発光層は種々の半導体(例:InN、AlN、GaN、InGaN、AlGaN、InAlGaN等の窒化物半導体、それ以外のIII−V族化合物半導体)により形成することができる。
透光性部材30は上面38と上面38に対向する下面32とを有している。上面38と下面32とは互いに平行である。透光性部材30の下面32は平面視において発光素子20の上面28と略相似形状であることが好ましい。また、透光性部材30の下面32の面積は発光素子20の上面28の面積より小さく、透光性部材30の下面32は平面視において発光素子20の上面周縁より内側に位置している。このような形状、面積及び配置により、発光素子20の上面28の周縁において接着部材40の表面張力が働くようになるとともに、接着部材40が透光性部材30の下面32と連なる第1側面34を這い上がるようになり、接着部材40がその硬化前に発光素子20と透光性部材30の間から垂れてしまうことが抑制される。
発光素子20の上面28と透光性部材30の下面32とは透光性の接着部材40により接着される。接着部材40は透光性部材30の第1側面34を覆っている。接着部材40は平面視において透光性部材30の第2側面36より内側に位置している。接着部材40が平面視で第2側面36の外側にはみ出ていると、発光素子20の光の一部が、透光性部材30を介することなく、当該はみ出ている部分から光反射性部材を介して光反射性部材の上面から光が漏れ出てしまう虞がある。しかしながら、上記の如く内側に位置させれば、このような漏れ光を防止して、発光部(領域X)と非発光部(領域X以外の領域)との輝度差が急峻でその境界が明確な発光装置とすることができる。
光反射性部材50は発光素子20の光を反射する光反射性材料を含んでいる。光反射性部材50の反射率は、発光素子20の光に対して60%以上であることが好ましく、80%または90%以上であることがより好ましい。
図2Aは実施形態2に係る発光装置の模式的平面図である。また、図2Bは、図2A中のB−B断面と、B−B断面中において破線で囲まれた領域を拡大した拡大断面と、を示す図である。図2A、図2Bに示すように、実施形態2に係る発光装置200は、実施形態1に係る発光装置100とは異なり、複数の発光素子20、複数の透光性部材30、及び複数の接着部材40を有している。複数の透光性部材30と複数の接着部材40は発光素子20ごとに配置されている。
図3Aは実施形態3に係る発光装置の模式的平面図である。また、図3Bは、図3A中のC−C断面と、C−C断面中において破線で囲まれた領域を拡大した拡大断面と、を示す図である。図3A、図3Bに示すように、実施形態3に係る発光装置300では、実施形態2に係る発光装置200と異なり、複数の発光素子20に対して一つの透光性部材30が設けられる。1つの透光性部材30は、1つの上面38を有する一方で、複数の発光素子20に対応して複数の下面32を有している。第1側面34と第2側面36は1つの透光性部材30の外周に設けられる。複数の下面32は溝部Yにより区切られており、各下面32は、対応する複数の発光素子20それぞれの上面の面積より小さく、平面視において、透光性部材30の下面32が発光素子20の上面28の周縁より内側に位置している。溝部Yは垂直側面Y1と傾斜側面Y2と平行面(溝部Yの底面)Y3とを有している。垂直側面Y1は、透光性部材30の下面32に連なり、発光素子20の上面28に対して垂直な面である。傾斜側面Y2は垂直側面Y1に連なり発光素子20の上面28に対して傾斜する面である。平行面(溝部Yの底面)は傾斜側面Y2に連なる透光性部材30の下面32に平行な面である。なお、本実施形態において、透光性部材30の溝部Yは、垂直側面Y1と傾斜側面Y2と平行面(溝部Yの底面)Y3とを有しているが、これは一例であって、溝部Yの形状はこれに限定されない。例えば、溝部は、発光素子20の上面28に対して傾斜する傾斜側面Y2のみで形成されていてもよい。
図4Aは実施形態4に係る発光装置の模式的平面図であり、図4Bは図4A中のD−D断面図である。図4A、図4Bに示すように、実施形態4に係る発光装置400は、透光性部材30が第2側面36と上面38との間に第3側面37を有している点で、実施形態1に係る発光装置100と異なっている。第3側面37は発光装置400の内側に凸となる緩やかな傾斜曲面を有している。
以下、透光性部材30の他の例について説明する。後述のとおり、以下で説明する形状の透光性部材30によっても、透光性部材30を発光素子20上の所望の位置に所望の向きで精度良く配置することができる。また、発光素子20から出射した光が接着部材40を伝って漏れ出てしまうことを防止し、発光部(領域X)と非発光部(領域X以外の領域)との輝度差が急峻でその境界が明確な発光装置を提供することができる。
以下、実施形態2に係る発光装置200の製造方法例について説明する。実施形態2に係る発光装置200について説明するが、実施形態1、3、4に係る発光装置100、300、400についても同様に製造することができる。
図9Aから図9Eは実施形態2に係る発光装置の製造方法の一例を示す図である。以下、図9Aから図9Eを参照しつつ、説明する。
図10Aから図10Cは実施形態2に係る発光装置の製造方法の他の一例を示す図である。以下、図10Aから図10Cを参照しつつ、説明する。
10 発光素子搭載用基板
20 発光素子
28 発光素子の上面
30 透光性部材
32 透光性部材の下面
34 第1側面
36 第2側面
37 第3側面
38 透光性部材の上面
40 接着部材
50 光反射性部材
60 導電部材
70 シート
80 接合部材
H1 発光素子の高さ
H2 第1側面の高さ
H3 第2側面の高さ
X 発光面
Y 溝部
Y1 垂直側面
Y2 傾斜側面
Y3 平行面(溝部の底面)
T 第3側面を覆う光反射性部材の厚み
Claims (8)
- 発光素子と、
平面視において前記発光素子の上面周縁より内側に位置する下面と、前記下面に連なり前記発光素子の上面に対して傾斜する1つ以上の傾斜面を有する第1側面と、前記第1側面より上方且つ外側に位置し、前記発光素子の上面の外縁と一致する外縁を有する第2側面と、を有し、蛍光体を含有する透光性部材と、
平面視において前記第2側面より内側に位置し、前記発光素子の上面と前記透光性部材の下面とを接着するとともに、前記第1側面を覆う透光性の接着部材と、
前記第2側面を覆う光反射性部材と、
を備えた発光装置。 - 前記第2側面は前記透光性部材の上面に連なり、該上面に対して垂直な面である請求項1に記載の発光装置。
- 前記発光素子、前記透光性部材、及び前記接着部材は複数設けられ、
前記複数の透光性部材と前記複数の接着部材は前記発光素子ごとに配置される請求項1または2に記載の発光装置。 - 前記複数の透光性部材は前記光反射性部材により一体的に保持される請求項3に記載の発光装置。
- 前記発光素子は複数設けられ、
前記透光性部材は前記複数の発光素子に対応して溝部により区切られた複数の前記下面を有し、
前記接着部材は前記溝部と前記下面とにそれぞれ配置され、前記下面に配置された隣接する接着部材は前記溝部に配置された接着部材を介して連なる請求項1に記載の発光装置。 - 前記複数の発光素子がマトリクス状に配置される請求項3から5のいずれか1項に記載の発光装置。
- 前記第1側面は前記透光性部材の下面に対して垂直な1つ以上の垂直面を有する請求項1から6のいずれか1項に記載の発光装置。
- 前記発光素子を搭載する発光素子搭載用基板を備える請求項1から7のいずれか1項に記載の発光装置。
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