Blinking Mechanisms and Intrinsic Quantum‐Confined Stark Effect in Single Methylammonium Lead Bromide Perovskite Quantum Dots
Xue Han, Guofeng Zhang, Bin Li, Changgang Yang, Wenli Guo, Xiuqing Bai, Peng Huang, Ruiyun Chen, Chengbing Qin, Jianyong Hu, Yifei Ma, Haizheng Zhong, Liantuan Xiao, Suotang Jia
Abstract
Abstract Lead halide perovskite quantum dots (QDs) are promising materials for next‐generation photoelectric devices because of their low preparation costs and excellent optoelectronic properties. In this study, the blinking mechanisms and the intrinsic quantum‐confined Stark effect (IQCSE) in single organic–inorganic hybrid CH 3 NH 3 PbBr 3 perovskite QDs using single‐dot photoluminescence (PL) spectroscopy is investigated. The PL quantum yield‐recombination rates distribution map allows the identification of different PL blinking mechanisms and their respective contributions to the PL emission behavior. A strong correlation between the excitation power and the blinking mechanisms is reported. Most single QDs exhibit band‐edge carrier blinking under a low excitation photon fluence. While under a high excitation photon fluence, different proportions of Auger‐blinking emerge in their PL intensity trajectories. In particular, significant IQCSEs in the QDs that exhibit more pronounced Auger‐blinking are observed. Based on these findings, an Auger‐induced IQCSE model to explain the observed IQCSE phenomena is observed.