JPWO2019093346A1 - 表示装置 - Google Patents
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- JPWO2019093346A1 JPWO2019093346A1 JP2019552823A JP2019552823A JPWO2019093346A1 JP WO2019093346 A1 JPWO2019093346 A1 JP WO2019093346A1 JP 2019552823 A JP2019552823 A JP 2019552823A JP 2019552823 A JP2019552823 A JP 2019552823A JP WO2019093346 A1 JPWO2019093346 A1 JP WO2019093346A1
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- Prior art keywords
- light emitting
- layer
- display device
- electrode
- quantum dots
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- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
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- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
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Abstract
Description
量子ドットの構成及び材質を限定するものではないが、例えば、本実施形態における量子ドットは、数nm〜数十nm程度の粒径を有するナノ粒子である。
脂肪族1級アミン系、オレイルアミン:C18H35NH2、ステアリル(オクタデシル)アミン:C18H37NH2、ドデシル(ラウリル)アミン:C12H25NH2、デシルアミン:C10H21NH2、オクチルアミン:C8H17NH2
脂肪酸、オレイン酸:C17H33COOH、ステアリン酸:C17H35COOH、パルミチン酸:C15H31COOH、ミリスチン酸:C13H27COOH、ラウリル(ドデカン)酸:C11H23COOH、デカン酸:C9H19COOH、オクタン酸:C7H15COOH
チオール系、オクタデカンチオール:C18H37SH、ヘキサンデカンチオール:C16H33SH、テトラデカンチオール:C14H29SH、ドデカンチオール:C12H25SH、デカンチオール:C10H21SH、オクタンチオール:C8H17SH
ホスフィン系、トリオクチルホスフィン:(C8H17)3P、トリフェニルホスフィン:(C6H5)3P、トリブチルホスフィン:(C4H9)3P
ホスフィンオキシド系、トリオクチルホスフィンオキシド:(C8H17)3P=O、トリフェニルホスフィンオキシド:(C6H5)3P=O、トリブチルホスフィンオキシド:(C4H9)3P=O
発光層13は、上記に挙げた量子ドットのみで形成されてもよいし、量子ドットと、別の蛍光物質とを含んでいてもよい。また、発光層13は、溶剤に溶かした量子ドットを、例えば、インクジェット法により塗布して形成することができ、発光層13中に多少、溶剤成分が残されていてもよい。
正孔輸送層12は、正孔を輸送する機能を有する無機物質、或いは、有機物質からなる。正孔輸送層12は、無機物質から成ることが好ましく、例えば、NiOや、WO3等の無機酸化物で形成されることが好ましい。正孔輸送層12は、特に、NiOのナノ粒子で形成されることが好ましい。また、正孔輸送層12には、例えば、NiOにAl2O3等を混合させることも出来る。また、金属酸化物に、Li、Mg、Al等がドープされてもよい。また、正孔輸送層12は、無機酸化物以外の無機物質であってもよい。
電子輸送層14は、電子を輸送する機能を有する無機物質、或いは、有機物質からなる。電子輸送層14は、無機物質から成ることが好ましく、例えば、ZnOX、Ti−O、Sn−O、V−Ox、Mo−O等の無機酸化物で形成されることが好ましい。これらのうち2種以上選択することもできる。電子輸送層14は、特に、ZnOXのナノ粒子で形成されることが好ましい。また、金属酸化物に、Li、Mg、Al、Mn等がドープされてもよい。また、電子輸送層14は、無機酸化物以外の無機物質(例えば、CsPbBr3等)であってもよい。Xは、限定されるものではないが、0.8〜1.2程度である。
本実施形態では、陽極11の材質を限定するものではないが、例えば、陽極11は、Au、Ag等の金属、CuISnO2、ZnOX等の導電性透明材、インジウム−スズの複合酸化物(ITO)で形成されることが好ましい。このうち、陽極11は、ITOで形成されることが好ましい。陽極11は、基板10上に、これらの電極物質を蒸着やスパッタリング等の方法により薄膜で形成することができる。
本実施形態では、陰極15の材質を限定するものではないが、例えば、陰極15は、インジウム−スズの複合酸化物(ITO)、金属、合金、電気伝導性化合物及びこれらの混合物を電極物質として用いることができる。例えば、陰極15は、ITOで形成される。なお、陰極15は、例えば、基板10上に形成された非透過性の金属層を介して形成される。これにより、発光素子3を、トップエミッションとすることができる。
本実施形態では、基板10の材質を限定するものでないが、基板10としては、例えば、ガラス、プラスチック等で形成することができる。基板10は、具体的には、例えば、ガラス、石英、透明樹脂フィルムで形成される。
実験では、表2に示す各サンプルの量子ドット(緑色QD)を製造し、図4Aの発光素子を備えたボトムボトムエミッション型の表示装置にて、シェル厚と外部量子効率(External Quantum Efficiency:EQE)との関係について調べた。
図15は、実験で使用した発光素子における各層のエネルギー準位図である。図16は、赤色量子ドットを使用したEL発光体及びPL発光体の電流値とEQEとの関係を示すグラフである。また、図17は、赤色量子ドットを使用したEL発光体及びPL発光体の電流値とEQEとの関係を示すグラフ、更に、青色量子ドットを使用したEL発光体の電流値とEQEとの関係を示すグラフである。図16に示す実施例5と実施例6では、シェル厚が異なる。実施例5のほうが実施例6よりシェル厚が厚い。また、図17では、実施例7が、最もシェル厚が厚く、実施例8及び実施例9の順にシェル厚が薄くなっている。
図18は、実験で使用した発光素子における各層のエネルギーバンドギャップEg、伝導帯下端のエネルギーECB、価電子帯上端のエネルギーEVBを表すグラフ、及び各層のエネルギー準位図である。図18に示すL1或いはL2に、ZnOX(Li)を用いた。ここで、Liはドープされていても、されていなくてもよい。限定するものではないが、Xは、0.8〜1.2程度である。図18に示すように、電子注入層(ETL)や、電子輸送層に用いるZnOXに、ZnOX(Li)を用いるとバンドギャップを広げることができるとわかった。ZnOX(Li)により粒子径を小さくする効果があるものと推測される。図18に示すPVKは、ホール注入層であり、B1、B2、G(H)、G(I3)、R(F)は、発光層(EL層)であり、ZnOX、L2、L4が電子注入層である。発光層に、B1やB2を用いる場合、電子注入層に、ZnOXを用いることができるが、発光層に、G(H)、G(I3)、R(F)を用いる場合は、電子注入層に、L2或いはL4を用いることが好ましいとわかった。L2及びL4は、ZnOX(Li)である。
Claims (7)
- 表示領域を備えた表示装置であって、
前記表示領域は、第1電極、前記第1電極と発光層との間の層、前記発光層、前記発光層と第2電極との間の層、及び、前記第2電極が基板上にこの順で積層された発光素子を有し、
前記発光層は、量子ドットを含む無機層で形成されており、前記発光素子は、トップエミッション型であることを特徴とする表示装置。 - 前記発光素子に接続される薄膜トランジスタが、n−ch TFTであることを特徴とする請求項1に記載の表示装置。
- 前記薄膜トランジスタの酸化物半導体が、In−Ga−Zn−O系半導体で形成されることを特徴とする請求項2に記載の表示装置。
- 前記表示装置は、可撓性を有することを特徴とする請求項1から請求項3のいずれかに記載の表示装置。
- 前記量子ドットは、コアの表面がシェルで覆われていない構造であることを特徴とする請求項1から請求項4のいずれかに記載の表示装置。
- 前記第1電極と発光層との間の層、前記発光層、及び前記発光層と第2電極との間の層の少なくともいずれか1層は、インクジェット法で形成されることを特徴とする請求項1から請求項5のいずれかに記載の表示装置。
- 前記第1電極と発光層との間の層、及び、前記発光層は、塗布して形成されており、前記発光層と第2電極との間の層は、蒸着或いは塗布して形成されていることを特徴とする請求項1から請求項6のいずれかに記載の表示装置。
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JP2016196631A (ja) * | 2015-03-23 | 2016-11-24 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | ナノ結晶の、特にAgInS2−ZnSナノ結晶のフォトルミネッセンス内部量子効率を増加するためのプロセス |
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US20210399249A1 (en) | 2021-12-23 |
EP3709774A1 (en) | 2020-09-16 |
CN111279794A (zh) | 2020-06-12 |
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US20230247849A1 (en) | 2023-08-03 |
WO2019093346A1 (ja) | 2019-05-16 |
TW201923433A (zh) | 2019-06-16 |
KR20200085275A (ko) | 2020-07-14 |
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