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Ultra‐Bright and Stable Pure Blue Light‐Emitting Diode from O, N Co‐Doped Carbon Dots
Author(s) -
Wang Xiao,
Ma Yurong,
Wu Qingyao,
Wang Zhenzhen,
Tao Yichen,
Zhao Yajie,
Wang Bo,
Cao Jingjing,
Wang Hui,
Gu Xiaoqing,
Huang Hui,
Li Si,
Wang Xiaoyong,
Hu Fengrui,
Shao Mingwang,
Liao Liangsheng,
Sham TsunKong,
Liu Yang,
Kang Zhenhui
Publication year - 2021
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.202000412
Subject(s) - electroluminescence , light emitting diode , materials science , optoelectronics , photoluminescence , diode , quantum dot , quantum efficiency , doping , fabrication , nanotechnology , layer (electronics) , medicine , alternative medicine , pathology
The pure blue light‐emitting diodes (LEDs) play a key role in the application of solid display and illumination. Most of pure blue LEDs reported so far, are based on semiconductor quantum dots and metal complex, involving heavy metal elements. Here, the fabrication of O, N co‐doped carbon dots (CDs) by a hydrothermal method from perylene‐3,4,9,10‐tetracarboxylic dianhydride and 2,3‐diaminophenazine is shown. These CDs show strong photoluminescence (PL) emission peaked at 447 nm (in ethanol) with absolute PL quantum yields of 88.9%. They are then doped into poly(vinyl carbazole) to form the active emission layer in the pure blue CDs LEDs. The electroluminescence emission of these CDs LEDs is centered at 452 nm with Commission Internationale d'Eclairage (CIE) coordinates of (0.14, 0.10). Moreover, the pure blue CDs LEDs show a high external quantum efficiency of 2.114%, high brightness of 648 cd m –2 , long half‐lifetime (T 50 ) of 200 h, and a favorable current efficiency of 2.2 cd A −1 . This work opens a new way to develop cost‐effective, environmental‐friendly, and high‐efficient metal‐free pure blue LEDs.