Issue 9, 2022

Blue-light-excited narrowing red photoluminescence in lead-free double perovskite Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx with cryogenic effects

Abstract

With the addition of Na+ and Bi3+ to the lead-free double perovskite Cs2AgInCl6, high photoluminescence quantum yields (PLQYs) can be achieved, making Cs2AgInCl6 more promising; however, it is still difficult to achieve blue-light-excited narrowing emission. In this study, Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx was developed with K+ and Br, realizing blue-light-excited narrowing red photoluminescence under cryogenic temperatures. The transitional non-localized donor energy level was formed by KBr addition, changing the exciton excitation and transition process. With the increase in the x value, Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx can be excited by blue light at 150 K and emit a narrowing red light. When 1 : 1 KBr was added, the full width at half maximum (FWHM) of Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx red light emission was further narrowed to only 73 nm, when excited by 467 nm blue light at 10 K. This study will stimulate further research on lead-free double perovskites in the field of display technologies.

Graphical abstract: Blue-light-excited narrowing red photoluminescence in lead-free double perovskite Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx with cryogenic effects

Supplementary files

Article information

Article type
Research Article
Submitted
26 jul 2021
Accepted
01 set 2021
First published
20 set 2021

Inorg. Chem. Front., 2022,9, 1879-1889

Blue-light-excited narrowing red photoluminescence in lead-free double perovskite Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx with cryogenic effects

X. Gong, X. Zhang, L. Li, J. Xu, R. Ding, H. Yin, Z. Zhang, Q. Li and L. Liu, Inorg. Chem. Front., 2022, 9, 1879 DOI: 10.1039/D1QI00928A

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