Coexistence of light-induced photoluminescence enhancement and quenching in CH3NH3PbBr3 perovskite films. Issue 19 (17th March 2020)

• Record Type: Journal Article
• Authors: Lou, Haoran; Lin, Chen; Fang, Zhishan; Jiang, Li; Chen, Xiaofeng; Ye, Zhizhen; He, Haiping
• Is Part Of: RSC advances. Volume 10:Issue 19(2020)
• Page Start: 11054
• Page End: 11059
• Publication Date: 2020-03-17
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra00605j
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Light illumination with relatively high intensity can result in photoluminescence enhancement and quenching simultaneously in lead halide perovskites. Abstract : Lead halide perovskites are promising semiconductors for various optoelectronic devices working in a wide photo-excitation density regime. However, photo-induced instability, attributed to illumination-activated mobile ions, has been an obstacle to their application. Herein, we use the time evolution of photoluminescence (PL) to investigate the light illumination effects of CH3 NH3 PbBr3 perovskite films under relatively high excitation (up to 4.5 W cm −2 ). We demonstrate that continuous illumination can lead to both PL enhancement and PL quenching simultaneously, with their weight ratios depending on the excitation density. The experimental data can be well described and interpreted by considering the coexistence of and competition between the photo-induced annihilation and the formation of long-living filled trap states. Our study may provide in-depth insight into the photo-induced instability of perovskite films and help to improve the performance of perovskite-based optoelectronic devices.