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Colloidal Synthesis and Optical Properties of All‐Inorganic Low‐Dimensional Cesium Copper Halide Nanocrystals
Author(s) -
Cheng Pengfei,
Sun Lei,
Feng Lu,
Yang Songqiu,
Yang Yang,
Zheng Daoyuan,
Zhao Yang,
Sang Youbao,
Zhang Ruiling,
Wei Donghui,
Deng Weiqiao,
Han Keli
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201909129
Subject(s) - halide , nanocrystal , caesium , nanorod , copper , metal halides , exciton , colloid , photoelectric effect , quantum dot , materials science , chemistry , inorganic chemistry , nanotechnology , photochemistry , optoelectronics , physics , organic chemistry , condensed matter physics
Abstract Low‐dimensional metal halides have recently attracted extensive attention owing to their unique structure and photoelectric properties. Herein, we report the colloidal synthesis of all‐inorganic low‐dimensional cesium copper halide nanocrystals (NCs) by adopting a hot‐injection approach. Using the same reactants and ligands, but different reaction temperatures, both 1D CsCu 2 I 3 nanorods and 0D Cs 3 Cu 2 I 5 NCs can be prepared. Density functional theory indicates that the reduced dimensionality in 1D CsCu 2 I 3 compared to 0D Cs 3 Cu 2 I 5 makes the excitons more localized, which accounts for the strong emission of 0D Cs 3 Cu 2 I 5 NCs. Subsequent optical characterization reveals that the highly luminescent, strongly Stokes‐shifted broadband emission of 0D Cs 3 Cu 2 I 5 NCs arises from the self‐trapped excitons. Our findings not only present a method to control the synthesis of low‐dimensional cesium copper halide nanocrystals but also highlight the potential of 0D Cs 3 Cu 2 I 5 NCs in optoelectronics.