期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 31, 页码 13093-13100出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202005966
关键词
2D perovskite halides; layered materials; nanocrystals; nanosheets; photoluminescence blinking
资金
- Swarna-Jayanti fellowship, Department of Science & Technology (DST), India [DST/SJF/CSA-02/2018-19]
- Shekh Saqr fellowship
- UGC Graduate Research Fellowships
- SERB National Post-doctoral Fellowship [PDF/2018/001143]
- CSIR
- SERB Early Career Research Award [ECR/2016/002052]
Two-dimensional (2D) lead-free halide perovskites have generated enormous perception in the field of optoelectronics due to their fascinating optical properties. However, an in-depth understanding on their shape-controlled charge-carrier recombination dynamics is still lacking, which could be resolved by exploring the photoluminescence (PL) blinking behaviour at the single-particle level. Herein, we demonstrate, for the first time, the synthesis of nanocrystals (NCs) and 2D nanosheets (NSs) of layered mixed halide, Cs3Bi2I6Cl3, by solution-based method. We applied fluorescence microscopy and super-resolution optical imaging at single-particle level to investigate their morphology-dependent PL properties. Narrow emission line widths and passivation of non-radiative defects were evidenced for 2D layered nanostructures, whereas the activation of shallow trap states was recognized at 77 K. Interestingly, individual NCs were found to display temporal intermittency (blinking) in PL emission. On the other hand, NS showed temporal PL intensity fluctuations within localized domains of the crystal. In addition, super-resolution optical image of the NS from localization-based method showed spatial inhomogeneity of the PL intensity within perovskite crystal.
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