Synthesis and Localized Photoluminescence Blinking of Lead‐Free 2D Nanostructures of Cs 3 Bi 2 I 6 Cl 3 Perovskite
| Autor: | Kaushik Kundu, Sarit S. Agasti, Ranjan Sasmal, Krishnendu Maji, Paribesh Acharyya, Kanishka Biswas |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Nanostructure Materials science Passivation 010405 organic chemistry business.industry Halide General Chemistry General Medicine 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Crystal Nanocrystal Optoelectronics Emission spectrum business Perovskite (structure) |
| Zdroj: | Angewandte Chemie. 132:13193-13200 |
| ISSN: | 1521-3757 0044-8249 |
| DOI: | 10.1002/ange.202005966 |
| Popis: | 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, Cs3 Bi2 I6 Cl3 , 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|