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Perovskite Light‐Emitting Diodes: Perovskite Quantum Dots with Ultralow Trap Density by Acid Etching‐Driven Ligand Exchange for High Luminance and Stable Pure‐Blue Light‐Emitting Diodes (Adv. Mater. 15/2021)
Author(s) -
Bi Chenghao,
Yao Zhiwei,
Sun Xuejiao,
Wei Xuecheng,
Wang Junxi,
Tian Jianjun
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202170119
Subject(s) - electroluminescence , materials science , light emitting diode , perovskite (structure) , quantum dot , optoelectronics , diode , luminance , etching (microfabrication) , oled , optics , nanotechnology , crystallography , chemistry , physics , layer (electronics)
In article number 2006722, Jianjun Tian and co‐workers report pure‐blue perovskite light‐emitting diodes (LEDs) based on ultralow‐trap‐density and extremely stable small‐sized CsPbBr 3 quantum dots, which is achieved by a novel acid‐etching‐driven ligand exchange. The LEDs exhibit electroluminescence at 470 nm wavelength with external quantum efficiency of 4.7%, remarkable high luminance (3850 cd m −2 ), and long‐term operational stability T 50 of 12 h.