High efficiency pure blue perovskite quantum dot light-emitting diodes based on formamidinium manipulating carrier dynamics and electron state filling

Long Gao; Yilin Zhang; Lijie Gou; Qian Wang; Meng Wang; Weitao Zheng; Yinghui Wang; Hin-Lap Yip; Jiaqi Zhang

doi:10.1038/s41377-022-00992-5

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High efficiency pure blue perovskite quantum dot light-emitting diodes based on formamidinium manipulating carrier dynamics and electron state filling

Original Articles

- High efficiency pure blue perovskite quantum dot light-emitting diodes based on formamidinium manipulating carrier dynamics and electron state filling
- Light: Science & Applications Vol. 11, Issue 12, Pages: 3087-3097(2022)
- Affiliations：
  
  1.College of Materials Science and Engineering, Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun, 130012, China
  2.Femtosecond Laser laboratory, Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun, 130012, China
  3.Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China
  4.School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China
  5.Hong Kong Institute for Clean Energy, City University of Hong Kong, Kowloon, Hong Kong, China
- Author bio：
  
  Hin-Lap Yip (a.yip@cityu.edu.hk)
  Jiaqi Zhang (zhangjiaqi@jlu.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-00992-5
  CLC：
- Published：31 December 2022，
  
  Published Online：14 December 2022，
  
  Received：06 March 2022，
  
  Revised：23 August 2022，
  
  Accepted：24 September 2022
- Accepted：
Scan QR Code
Gao, L. et al. High efficiency pure blue perovskite quantum dot light-emitting diodes based on formamidinium manipulating carrier dynamics and electron state filling. Light: Science & Applications, 11, 3087-3097 (2022).
DOI：

Gao, L. et al. High efficiency pure blue perovskite quantum dot light-emitting diodes based on formamidinium manipulating carrier dynamics and electron state filling. Light: Science & Applications, 11, 3087-3097 (2022). DOI： 10.1038/s41377-022-00992-5.

摘要

Abstract

Achieving high efficiency and stable pure blue colloidal perovskite quantum dot (QD) light-emitting diodes (LEDs) is still an enormous challenge because blue emitters typically exhibit high defect density

low photoluminescence quantum yield (PLQY) and easy phase dissociation. Herein

an organic cation composition modification strategy is used to synthesize high-performance pure blue perovskite quantum dots at room temperature. The synthesized FA-CsPb(Cl

0.5

)

QDs show a bright photoluminescence with a high PLQY (65%)

which is 6 times higher than the undoped samples. In addition

the photophysical properties of the FA cation doping was deeply illustrated through carrier dynamics and first principal calculation

which show lower defects

longer lifetime

and more reasonable band gap structure than undoped emitters. Consequently

pure blue FA-CsPb(Cl

0.5

)

QDs light-emitting devices were fabricated and presented a maximum luminance of 1452 cd m

−2

and an external quantum efficiency of 5.01 % with an emission at 474 nm. The excellent photoelectric properties mainly originate from the enhanced blue QDs emitter and effective charge injection and exciton radiation. Our finding underscores this easy and feasible room temperature doping approach as an alternative strategy to blue perovskite QD LED development.

关键词

Keywords

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