Skip to main content

Research Repository

Advanced Search

Dual‐Defect Manipulation Enables Efficient and Spectrally Stable Blue Perovskite Light‐Emitting Diodes

Zhang, Chengxi; Yuan, Hao; Kong, Lingmei; Wang, Lin; Wang, Yuanzhi; Li, Yunguo; Yang, Yingguo; Turyanska, Lyudmila; Yang, Xuyong

Dual‐Defect Manipulation Enables Efficient and Spectrally Stable Blue Perovskite Light‐Emitting Diodes Thumbnail


Authors

Chengxi Zhang

Hao Yuan

Lingmei Kong

LIN WANG LIN.WANG1@NOTTINGHAM.AC.UK
Assistant Professor

Yuanzhi Wang

Yunguo Li

Yingguo Yang

Xuyong Yang



Abstract

Performance of blue solution‐processed perovskite light‐emitting diodes (LEDs) is limited by availability of blue perovskite materials. Herein, 4‐(trifluoromethyl)benzoyl ammonium bromide (4‐TMBABr) is used with abundant N H and C O groups to passivate the defects and produce highly stable PEAxPA2‐x(CsPbBr3)n‐1PbBr4 perovskites for blue LED applications. The N H group in the 4‐TMBABr suppresses the Br‐ion mismatch through hydrogen bonds (N‐H···Br) and C O group coordinates the unsaturated lead dangling bonds (C O:Pb). The effective defect passivation by 4‐TMBABr reduces the nonradiative recombination in the perovskite films, hence enhancing its optical performance. In the LED structure, the sodium bis(trifluoromethanesulfonyl)imide (SBTI) modified NiOx films are used to improve the hole transport and to inhibit the fluorescence quenching of the perovskite layer. The dual‐defect manipulation strategy is advantageous for producing efficient and spectrally stable blue perovskite LEDs, and the authors demonstrate an LED with maximum luminance of 1094 cd m−2 and external quantum efficiency of 10.3%. This work can inform and underpin future development of blue perovskite LEDs with highly efficient and stabile performance.

Citation

Zhang, C., Yuan, H., Kong, L., Wang, L., Wang, Y., Li, Y., …Yang, X. (2023). Dual‐Defect Manipulation Enables Efficient and Spectrally Stable Blue Perovskite Light‐Emitting Diodes. Advanced Optical Materials, 11(14), Article 2300147. https://doi.org/10.1002/adom.202300147

Journal Article Type Article
Acceptance Date Mar 17, 2023
Online Publication Date Apr 21, 2023
Publication Date Jul 18, 2023
Deposit Date Apr 24, 2023
Publicly Available Date Apr 25, 2023
Journal Advanced Optical Materials
Electronic ISSN 2195-1071
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 11
Issue 14
Article Number 2300147
DOI https://doi.org/10.1002/adom.202300147
Keywords blue perovskites, defect passivation, interface modification, ligands, light‐emitting diodes
Public URL https://nottingham-repository.worktribe.com/output/19992824
Publisher URL https://onlinelibrary.wiley.com/doi/10.1002/adom.202300147

Files





You might also like



Downloadable Citations