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Gradient Alloy Shell Enabling Colloidal Quantum Wells Light-Emitting Diodes with Efficiency Exceeding 22.
Ba, Guohang; Yang, Yumin; Huang, Fei; Wang, Junfeng; Lu, Yue; Li, Jing; Cheng, Chunyan; Sui, Manling; Tian, Jianjun.
Afiliação
  • Ba G; Institute for Advanced Materials and Technology, University of Science and Technology Beijing,, Beijing 100083, China.
  • Yang Y; Institute for Advanced Materials and Technology, University of Science and Technology Beijing,, Beijing 100083, China.
  • Huang F; Institute for Advanced Materials and Technology, University of Science and Technology Beijing,, Beijing 100083, China.
  • Wang J; Institute for Advanced Materials and Technology, University of Science and Technology Beijing,, Beijing 100083, China.
  • Lu Y; Beijing Key Laboratory of Microstructure and Properties of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.
  • Li J; Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
  • Cheng C; Institute for Advanced Materials and Technology, University of Science and Technology Beijing,, Beijing 100083, China.
  • Sui M; Beijing Key Laboratory of Microstructure and Properties of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.
  • Tian J; Institute for Advanced Materials and Technology, University of Science and Technology Beijing,, Beijing 100083, China.
Nano Lett ; 24(15): 4454-4461, 2024 Apr 17.
Article em En | MEDLINE | ID: mdl-38572779
ABSTRACT
Colloidal quantum well (CQW) based light emitting diodes (LEDs) possess extra-high theoretical efficiency, but their performance still lags far behind conventional LEDs due to severe exciton quenching and unbalanced charge injection. Herein, we devised a gradient composition CdxZn1-xS shell to address these issues. The epitaxial shell with gradient composition was achieved through controlling competition between Cd2+ and Zn2+ cations to preferentially bind to the anions S2-. Thus, exciton quenching was suppressed greatly by passivating defects and reducing nonradiative recombination, thereby achieving near-unity photoluminescence quantum yield (PLQY). The gradient energy level of the shell reduced the hole injection barriers and increased the hole injection efficiency to balance the charge injection of LEDs. As a result, the LEDs achieved a high external quantum efficiency (EQE) of 22.83%, luminance of 111,319 cd/m2 and a long operational lifetime (T95@100 cd/m2) over 6,500 h, demonstrating the state-of-the-art performance for the CQW based LEDs.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article