JP7017761B2 - 発光装置、プロジェクター、およびディスプレイ - Google Patents
発光装置、プロジェクター、およびディスプレイ Download PDFInfo
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- JP7017761B2 JP7017761B2 JP2019195936A JP2019195936A JP7017761B2 JP 7017761 B2 JP7017761 B2 JP 7017761B2 JP 2019195936 A JP2019195936 A JP 2019195936A JP 2019195936 A JP2019195936 A JP 2019195936A JP 7017761 B2 JP7017761 B2 JP 7017761B2
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- 239000004065 semiconductor Substances 0.000 claims description 129
- 239000000758 substrate Substances 0.000 claims description 25
- 230000007423 decrease Effects 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 description 29
- 230000000694 effects Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000004038 photonic crystal Substances 0.000 description 8
- 238000000605 extraction Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001451 molecular beam epitaxy Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002061 nanopillar Substances 0.000 description 2
- 239000002073 nanorod Substances 0.000 description 2
- 239000002070 nanowire Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 229910002704 AlGaN Inorganic materials 0.000 description 1
- 229910000980 Aluminium gallium arsenide Inorganic materials 0.000 description 1
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Description
基体と、
前記基体に設けられ、複数の柱状部を有する積層体と、
を有し、
前記柱状部は、
第1半導体層と、
前記第1半導体層と導電型の異なる第2半導体層と、
前記第1半導体層と前記第2半導体層との間に設けられた発光層と、
を有し、
前記積層体は、
前記第2半導体層の前記基体とは反対側に接続され、前記第2半導体層と同じ導電型の第3半導体層を有し、
前記第2半導体層は、前記発光層と前記第3半導体層との間に設けられ、
前記第3半導体層には、凹部が設けられ、
前記第3半導体層の前記基体側とは反対側の面には、前記凹部の開口が設けられ、
前記凹部の底における径は、前記凹部の開口における径よりも小さい。
前記積層体の前記基体側とは反対側には、電極が設けられていてもよい。
前記積層体の積層方向から見て、前記電極の前記凹部と重なる位置には、前記電極を貫通する貫通孔が設けられていてもよい。
前記凹部は、複数設けられ、
複数の前記柱状部は、第1方向に第1ピッチで配列され、
複数の前記凹部は、第2方向に第2ピッチで配列され、
前記第1方向は、前記柱状部が最も短いピッチで並ぶ方向であり、
前記第2方向は、前記凹部が最も短いピッチで並ぶ方向であり、
前記第2ピッチは、前記第1ピッチよりも小さくてもよい。
前記凹部の開口における径は、前記柱状部の径よりも小さくてもよい。
前記凹部の形状は、円錐または角錐であってもよい。
前記凹部の径は、前記凹部の開口から前記凹部の底に向かうに従って、小さくてもよい。
前記発光装置を有する。
1.1. 発光装置
まず、第1実施形態に係る発光装置について、図面を参照しながら説明する。図1は、第1実施形態に係る発光装置100を模式的に示す断面図である。図2は、第1実施形態に係る発光装置100を模式的に示す平面図である。なお、図1は、図2のI-I線断面図である。
層32により、pinダイオードが構成される。発光装置100では、第1電極50と第2電極52との間に、pinダイオードの順バイアス電圧を印加すると、発光層34に電流が注入されて発光層34で電子と正孔との再結合が起こる。この再結合により発光が生じる。発光層34で発生した光は、第1半導体層32および第2半導体層36により積層方向と直交する方向に伝搬し、複数の柱状部30によるフォトニック結晶の効果により定在波を形成し、発光層34で利得を受けてレーザー発振する。そして、発光装置100は、+1次回折光および-1次回折光をレーザー光として、積層方向に射出する。
発光装置100では、第3半導体層38には凹部40が設けられ、凹部40の底42における径Bは、凹部40の開口41における径Tよりも小さい。そのため、発光装置100では、上述したように、第2電極52による光の損失を低減でき、かつ、光の取り出し効率を向上できる。
次に、第1実施形態に係る発光装置100の製造方法について、図面を参照しながら説
明する。図6は、第1実施形態に係る発光装置100の製造工程を模式的に示す断面図である。
次に、第2実施形態に係る発光装置について、図面を参照しながら説明する。図7は、第2実施形態に係る発光装置200を模式的に示す断面図である。図8は、発光装置200の第3半導体層38を模式的に示す断面図である。なお、図8には、さらに、積層方向における第3半導体層38の平均屈折率の分布を示すグラフを図示している。
状は角錐であって、凹部40の底42が角錐の頂点となっていてもよい。この場合も、凹部40の形状が円錐の場合と同様の作用効果を奏することができる。
次に、第3実施形態に係るプロジェクターについて、図面を参照しながら説明する。図9は、第3実施形態に係るプロジェクター900を模式的に示す図である。
ックプリズム、908…投射装置、910…スクリーン
Claims (8)
- 基体と、
前記基体に設けられ、複数の柱状部を有する積層体と、
を有し、
前記複数の柱状部の各々は、
第1半導体層と、
前記第1半導体層と導電型の異なる第2半導体層と、
前記第1半導体層と前記第2半導体層との間に設けられた発光層と、
を有し、
前記第1半導体層および前記第2半導体層は、前記発光層に光を閉じ込めるクラッド層であり、
前記積層体は、
前記第2半導体層の前記基体とは反対側に接続され、前記第2半導体層と同じ導電型の第3半導体層を有し、
前記第3半導体層は、コンタクト層であり、
前記第2半導体層は、前記発光層と前記第3半導体層との間に設けられ、
前記第3半導体層には、凹部が設けられ、
前記第3半導体層の前記基体側とは反対側の面には、前記凹部の開口が設けられ、
前記凹部の底における径は、前記凹部の開口における径よりも小さく、
前記凹部の深さは、前記第3半導体層の厚さよりも小さく、
前記積層体の前記基体側とは反対側には、電極が設けられ、
前記電極は、前記第3半導体層と電気的に接続されている、発光装置。 - 請求項1において、
前記積層体の積層方向から見て、前記電極の前記凹部と重なる位置には、前記電極を貫通する貫通孔が設けられている、発光装置。 - 請求項1または2において、
前記凹部は、複数設けられ、
前記複数の柱状部は、第1方向に第1ピッチで配列され、
複数の前記凹部は、第2方向に第2ピッチで配列され、
前記第1方向は、前記複数の柱状部の各々が最も短いピッチで並ぶ方向であり、
前記第2方向は、前記凹部が最も短いピッチで並ぶ方向であり、
前記第2ピッチは、前記第1ピッチよりも小さい、発光装置。 - 請求項1ないし3のいずれか1項において、
前記凹部の開口における径は、前記複数の柱状部の各々の径よりも小さい、発光装置。 - 請求項1ないし4のいずれか1項において、
前記凹部の形状は、円錐または角錐である、発光装置。 - 請求項1ないし5のいずれか1項において、
前記凹部の径は、前記凹部の開口から前記凹部の底に向かうに従って、小さくなる、発光装置。 - 請求項1ないし6のいずれか1項に記載の発光装置を有する、プロジェクター。
- 請求項1ないし6のいずれか1項に記載の発光装置を有する、ディスプレイ。
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