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Large‐Scale Synthesis of Highly Luminescent Perovskite‐Related CsPb 2 Br 5 Nanoplatelets and Their Fast Anion Exchange
Author(s) -
Wang KunHua,
Wu Liang,
Li Lei,
Yao HongBin,
Qian HaiSheng,
Yu ShuHong
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201602787
Subject(s) - photoluminescence , luminescence , materials science , nanocrystal , perovskite (structure) , precipitation , nanomaterials , halide , nanotechnology , caesium , ion , ion exchange , crystal (programming language) , chemical engineering , crystallography , inorganic chemistry , chemistry , optoelectronics , organic chemistry , physics , engineering , meteorology , computer science , programming language
All‐inorganic cesium lead‐halide perovskite nanocrystals have emerged as attractive optoelectronic nanomaterials owing to their stabilities and highly efficient photoluminescence. Herein we report a new type of highly luminescent perovskite‐related CsPb 2 Br 5 nanoplatelets synthesized by a facile precipitation reaction. The layered crystal structure of CsPb 2 Br 5 promoted an anisotropic two‐dimensional (2D) crystal growth during the precipitation process, thus enabling the large‐scale synthesis of CsPb 2 Br 5 nanoplatelets. Fast anion exchange has also been demonstrated in as‐synthesized CsPb 2 Br 5 nanoplatelets to extend their photoluminescence spectra to the entire visible spectral region. The large‐scale synthesis and optical tunability of CsPb 2 Br 5 nanoplatelets will be advantageous in future applications of optoelectronic devices.