Ceramic-like stable CsPbBr3 nanocrystals encapsulated in silica derived from molecular sieve templates

Qinggang Zhang; Bo Wang; Weilin Zheng; Long Kong; Qun Wan; Congyang Zhang; Zhichun Li; Xueyan Cao; Mingming Liu; Liang Li

doi:10.1038/s41467-019-13881-0

Ceramic-like stable CsPbBr₃ nanocrystals encapsulated in silica derived from molecular sieve templates

Nat Commun. 2020 Jan 7;11(1):31. doi: 10.1038/s41467-019-13881-0.

Authors

Qinggang Zhang¹, Bo Wang¹, Weilin Zheng¹, Long Kong¹, Qun Wan¹, Congyang Zhang¹, Zhichun Li¹, Xueyan Cao¹, Mingming Liu¹, Liang Li^{2

3}

Affiliations

¹ School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
² School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China. liangli117@sjtu.edu.cn.
³ Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, P. R. China. liangli117@sjtu.edu.cn.

Abstract

Achieving good stability while maintaining excellent properties is one of the main challenges for enhancing the competitiveness of luminescent perovskite CsPbX₃ (X=Cl, Br, I) nanocrystals (NCs). Here, we propose a facile strategy to synthesize ceramic-like stable and highly luminescent CsPbBr₃ NCs by encapsulating them into silica derived from molecular sieve templates at high temperature (600-900 ^oC). The obtained CsPbBr₃-SiO₂ powders not only show high photoluminescence quantum yield (~71%), but also show an exceptional stability comparable to the ceramic Sr₂SiO₄:Eu²⁺ green phosphor. They can maintain 100% of their photoluminescence value under illumination on blue light-emitting diodes (LEDs) chips (20 mA, 2.7 V) for 1000 h, and can also survive in a harsh hydrochloric acid aqueous solution (1 M) for 50 days. We believe that the above robust stabilities will significantly enhance the potential of perovskite CsPbX₃ NCs to be practically applied in LEDs and backlight displays.