Affiliation:
1. Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, Hubei Luojia Laboratory, School of Physics and Technology, Wuhan University , Wuhan 430072, People's Republic of China
Abstract
Metal halide perovskites have emerged as promising candidates for x-ray detection; in particular, the in-direct detectors based on perovskite scintillators have demonstrated appealing performance metrics. However, both perovskite thin films and nanocrystals still suffer from poor stability. In this work, we introduce a heterovalent cation exchange strategy to effectively modulate the optoelectronic properties of perovskite nanocrystals and further enhance their stability. Here, a portion of Pb2+ in perovskite nanocrystals was replaced with lead-free Sb3+. This is a versatile method that can be applied to cation exchange of various perovskite nanocrystals, such as CsPbX3 and FAPbX3, allowing for the synthesis of a wide range of mixed-cation perovskite compositions. The resulting nanocrystals exhibit relatively high photoluminescence quantum yields and improved thermal stability and water resistance. The Sb@CsPbBr3 nanocrystals also demonstrated great potential for x-ray detection as scintillators with fast response, bright and radioluminescence, and excellent image quality.
Funder
National Natural Science of China
Open Fund of Hubei Luojia Laboratory
Wuhan Science and Technology Project
Project funded by China Postdoctoral Science Foundation
Subject
Physics and Astronomy (miscellaneous)