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

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