Large-Scale Synthesis of Highly Luminescent Perovskite-Related CsPb2 Br5 Nanoplatelets and Their Fast Anion Exchange

Kun-Hua Wang; Liang Wu; Lei Li; Hong-Bin Yao; Hai-Sheng Qian; Shu-Hong Yu

doi:10.1002/anie.201602787

Large-Scale Synthesis of Highly Luminescent Perovskite-Related CsPb2 Br5 Nanoplatelets and Their Fast Anion Exchange

Angew Chem Int Ed Engl. 2016 Jul 11;55(29):8328-32. doi: 10.1002/anie.201602787. Epub 2016 May 23.

Authors

Kun-Hua Wang¹, Liang Wu¹, Lei Li¹, Hong-Bin Yao², Hai-Sheng Qian³, Shu-Hong Yu⁴

Affiliations

¹ Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China.
² Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China. yhb@ustc.edu.cn.
³ School of Medical Engineering, Hefei University of Technology, Hefei, 230009, China.
⁴ Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China. shyu@ustc.edu.cn.

PMID: 27213688
DOI: 10.1002/anie.201602787

Abstract

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 CsPb2 Br5 nanoplatelets synthesized by a facile precipitation reaction. The layered crystal structure of CsPb2 Br5 promoted an anisotropic two-dimensional (2D) crystal growth during the precipitation process, thus enabling the large-scale synthesis of CsPb2 Br5 nanoplatelets. Fast anion exchange has also been demonstrated in as-synthesized CsPb2 Br5 nanoplatelets to extend their photoluminescence spectra to the entire visible spectral region. The large-scale synthesis and optical tunability of CsPb2 Br5 nanoplatelets will be advantageous in future applications of optoelectronic devices.

Keywords: anion exchange; cesium lead halides; nanoplatelets; perovskites; photoluminescence.

Publication types

Research Support, Non-U.S. Gov't