JP7389021B2 - 発光素子及びそれを有する表示装置 - Google Patents
発光素子及びそれを有する表示装置 Download PDFInfo
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- JP7389021B2 JP7389021B2 JP2020515261A JP2020515261A JP7389021B2 JP 7389021 B2 JP7389021 B2 JP 7389021B2 JP 2020515261 A JP2020515261 A JP 2020515261A JP 2020515261 A JP2020515261 A JP 2020515261A JP 7389021 B2 JP7389021 B2 JP 7389021B2
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- HZXMRANICFIONG-UHFFFAOYSA-N gallium phosphide Chemical compound [Ga]#P HZXMRANICFIONG-UHFFFAOYSA-N 0.000 description 2
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- H01L33/26—Materials of the light emitting region
- H01L33/30—Materials of the light emitting region containing only elements of Group III and Group V of the Periodic Table
- H01L33/32—Materials of the light emitting region containing only elements of Group III and Group V of the Periodic Table containing nitrogen
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Description
系半導体、例えば、(Al、Ga、In)Nのような窒化物系半導体から形成されることができる。n型半導体層1110、活性層1112及びp型半導体層1114は金属有機化学気相成長法(MOCVD)のような公知の方法を利用して形成されてもよい。また、n型半導体層1110はn型不純物(例えば、Si、Ge、Sn)を含み、p型半導体層1114はp型不純物(例えば、Mg、Sr、Ba)を含む。一実施形態で、n型半導体層1110はドーパントとしてSiを含むGaN又はAlGaNを含むことができ、p型半導体層1114はドーパントとしてMgを含むGaN又はAlGaNを含むことができる。
Claims (23)
- 各々第1導電形半導体層、活性層、及び第2導電形半導体層を含む第1発光セル、第2発光セル、及び第3発光セルと、
前記第1乃至第3発光セルを独立的に駆動できるように前記第1乃至第3発光セルに電気的に接続されたパッドと、
前記第2発光セルで放出された光の波長を変換する第2波長変換器と、
前記第3発光セルで放出された光の波長を変換する第3波長変換器と、を含み、前記第3波長変換器は、前記第2波長変換器より長い波長に光の波長を変換すると共に、前記第2波長変換器より光変換効率が小さく、
前記第2発光セルは、前記第1発光セルより大きい面積を有し、
前記第3発光セル及び前記第3波長変換器は、それぞれ前記第2発光セル及び前記第2波長変換器より大きい面積を有する発光素子。 - 前記第1乃至第3発光セルは、青色光を放出し、
前記第2波長変換器は、前記青色光を緑色光に変換し、
前記第3波長変換器は、前記青色光を赤色光に変換する請求項1に記載の発光素子。 - 前記第1発光セルに対する第2発光セル及び第3発光セルの面積比は、各々前記第2波長変換器の光変換効率及び前記第3波長変換器の光変換効率に反比例する請求項2に記載の発光素子。
- 前記第1発光セルで放出された光の波長を第1波長の光に変換する第1波長変換器をさらに含み、前記第1波長変換器は、前記第2波長変換器よりさらに短波長に光の波長を変換すると共に、前記第2波長変換器より光変換効率が大きく、
前記第1波長変換器は、前記第2波長変換器より小さい面積を有し、
前記第1乃至第3発光セルは、紫外線を放出する請求項1に記載の発光素子。 - 前記第1波長変換器は、紫外線を青色光に変換し、
前記第2波長変換器は、前記紫外線を緑色光に変換し、
前記第3波長変換器は、前記紫外線を赤色光に変換する請求項4に記載の発光素子。 - 前記第1発光セルに対する第2発光セル及び第3発光セルの面積比は、各々前記第1波長変換器に対する前記第2波長変換器の光変換効率比及び前記第3波長変換器の光変換効率比に反比例する請求項5に記載の発光素子。
- 前記第1波長変換器上に配置された第1カラーフィルターと、
前記第2波長変換器上に配置された第2カラーフィルターと、
前記第3波長変換器上に配置された第3カラーフィルターと、をさらに含む請求項4に記載の発光素子。 - 前記第2波長変換器上に配置された第2カラーフィルターと、
前記第3波長変換器上に配置された第3カラーフィルターと、をさらに含む請求項1に記載の発光素子。 - 前記第1乃至第3発光セルが配置された基板をさらに含む請求項1に記載の発光素子。
- 前記第1発光セル乃至前記第3発光セルの間の各々に提供され、前記光を遮蔽する隔壁を含み、
前記第1発光セル乃至前記第3発光セルの高さは、前記隔壁の高さより低く、
前記隔壁と前記第1発光セル乃至前記第3発光セルとの間の距離は、10μm乃至20μm以下である請求項1に記載の発光素子。 - 前記第1発光セル乃至前記第3発光セルの間に提供された前記隔壁は、互いに接続された一体である請求項10に記載の発光素子。
- 前記第1発光セル乃至前記第3発光セルの間の各々に提供され、前記光を遮蔽する隔壁を含み、
前記隔壁の幅は、前記基板から遠くなるにつれ、減少する請求項9に記載の発光素子。 - 前記第1発光セル乃至前記第3発光セルの間の各々に提供され、前記光を遮蔽する隔壁を含み、
前記基板の平面上の面積の中で前記隔壁が占める面積の比は、0.5乃至0.99である請求項9に記載の発光素子。 - 前記隔壁の高さは、15μm乃至115μmである請求項10に記載の発光素子。
- 前記第1発光セル乃至前記第3発光セルは、三角形状に配置される請求項9に記載の発光素子。
- 前記第1発光セル乃至前記第3発光セルは、一字形状に配置される請求項9に記載の発光素子。
- 前記第1乃至第3発光セルは、第1導電形半導体層を共有する請求項9に記載の発光素子。
- 前記パッドの中で前記共有された第1導電形半導体層に電気的に接続されたパッドから延長する延長部をさらに含む請求項17に記載の発光素子。
- 前記第2波長変換器と前記第3波長変換器は、同一フィルム内に位置する請求項1に記載の発光素子。
- 前記第2波長変換器と前記第3波長変換器は、積層フィルム内に位置し、
前記第2波長変換器と前記第3波長変換器は、互いに異なる層内に位置する請求項1に記載の発光素子。 - 基板と、
前記基板上に提供され、赤色光、緑色光、及び青色光を出射する第1発光セル、第2発光セル、及び第3発光セルと、
前記第1発光セル乃至前記第3発光セルの間の各々に提供され、前記光を遮蔽する隔壁を含み、
前記第1発光セル乃至前記第3発光セルの高さは、前記隔壁の高さより低く、
前記隔壁と前記第1発光セル乃至前記第3発光セルの間の距離は、5μm以下であり、
前記隔壁は、前記第1発光セル乃至前記第3発光セルの各々を囲む複数の開口を含み、
前記複数の開口のうち、少なくとも1つは、蛍光体層によって内部が満たされるとともに、前記蛍光体層で満たされていない残りの開口は、透明な保護層によって内部が満たされ、
前記透明な保護層は、前記隔壁の上面及び前記蛍光体層を覆う発光素子。 - 前記蛍光体層の上に、前記開口の幅よりも大きい幅を有するカラーフィルターが設けられている、請求項21に記載の発光素子。
- 回路基板と、
前記回路基板上に配列された複数の画素と、を含み、
前記複数の画素の各々は、請求項1乃至請求項22のいずれか一項の発光素子である表示装置。
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US11824145B2 (en) | 2023-11-21 |
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