2021•The Journal of Physical Chemistry CRequires access
Optical Property of Inorganic Halide Perovskite Hexagonal Nanocrystals
Jian Wu, Shiyu Zhao, Xiaochun Chi, Ning Sui, Zhi‐Hui Kang, Qiang Zhou, Hanzhuang Zhang, Xianfeng Li, Bing Zhao, Yinghui Wang
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Abstract
Inorganic halide perovskite nanocrystals (NCs) exhibit many excellent optical and semiconductor properties. Herein, CsPbBr 3 hexagonal NCs (HNCs) have been synthesized, and their photophysical behavior has been investigated in detail. The CsPbBr 3 cubic NCs (CNCs) act as references. The CsPbBr 3 HNCs exhibit apparent linear and two-photon fluorescence properties, and their two-photon absorption cross section is 4668.7 GM. In addition, the energy band, radiative channel, and carrier recombination of CsPbBr 3 HNCs have been analyzed compared to those of CsPbBr 3 NCs by changing the temperature and pressure. The photoluminescence (PL) property of CsPbBr 3 HNCs is always better than that of CsPbBr 3 CNCs since their electron–hole bimolecular recombination related to PL is much rapid. Our results provide comprehensive insights into the photophysical properties of inorganic halide perovskite nanomaterials and examine their potential in the optoelectronic field.