High-performance and stable CsPbBr3 light-emitting diodes based on polymer additive treatment

Wanqing Cai; Ziming Chen; Dongcheng Chen; Shijian Su; Qinghua Xu; Hin-Lap Yip; Yong Cao

doi:10.1039/c9ra05270d

High-performance and stable CsPbBr₃ light-emitting diodes based on polymer additive treatment

RSC Adv. 2019 Sep 3;9(47):27684-27691. doi: 10.1039/c9ra05270d. eCollection 2019 Aug 29.

Authors

Wanqing Cai¹, Ziming Chen¹, Dongcheng Chen¹, Shijian Su¹, Qinghua Xu², Hin-Lap Yip^{1

3}, Yong Cao¹

Affiliations

¹ State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology 381 Wushan Road Guangzhou 510640 P. R. China mszimingchen@yahoo.com msangusyip@scut.edu.cn.
² Department of Chemistry, National University of Singapore 117543 Singapore.
³ Innovation Center for Printed Photovoltaics, South China Institute of Collaborative Innovation Dongguan 523808 P. R. China.

Abstract

Because of their high efficiency and sharp emission, perovskite light-emitting diodes are a promising candidate for next-generation lighting techniques. However, the relatively poor stability of perovskite light-emitting diodes lowers their utility. Therefore, a highly stable perovskite light-emitting diode has to be developed to meet the commercial demand. Herein, we report a highly stable CsPbBr₃ light-emitting diode via simple polymer treatment. The addition of 2-methyl-2-oxazoline in perovskite film assists the formation of CsPbBr₃ nanocrystals, improving the quality and photoluminescence property of perovskite film. Based on such CsPbBr₃ nanocrystals and polymer hybrid film, our device presents a high external quantum efficiency and luminance of around 3.0% and 16 648 cd m^-2, respectively. Moreover, an excellent device half-lifetime of more than 2.4 hours has been achieved, under continuous operation at a relatively high initial luminance of 1000 cd m^-2, representing one of the most stable PeLEDs operated at such high initial luminance.