Dual‐Band‐Tunable White‐Light Emission from Bi3+/Te4+ Emitters in Perovskite‐Derivative Cs2SnCl6 Microcrystals. (18th January 2022)

• Record Type: Journal Article
• Authors: Zhang, Wei; Zheng, Wei; Li, Lingyun; Huang, Ping; Gong, Zhongliang; Zhou, Ziwei; Sun, Jinyue; Yu, Yan; Chen, Xueyuan
• Is Part Of: Angewandte Chemie. Volume 134:Number 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-18
• Subjects: Bismuth -- Cs2SnCl6 -- Excited-State Dynamics -- Tellurium -- White-Light Emission; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202116085
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Luminescent metal halides have attracted considerable attention in next‐generation solid‐state lighting because of their superior optical properties and easy solution processibility. Herein, we report a new class of highly efficient and dual‐band‐tunable white‐light emitters based on Bi 3+ /Te 4+ co‐doped perovskite derivative Cs2 SnCl6 microcrystals. Owing to the strong electron‐phonon coupling and efficient energy transfer from Bi 3+ to Te 4+, the microcrystals exhibited broad dual‐band white‐light emission originating from the inter‐configurational 3 P0, 1 → 1 S0 transitions of Bi 3+ and Te 4+, with good stability and a high photoluminescence (PL) quantum yield of up to 68.3 %. Specifically, a remarkable transition in Bi 3+ ‐PL lifetime from milliseconds at 10 K to microseconds at 300 K was observed, as solid evidence for the isolated Bi 3+ emission. These findings provide not only new insights into the excited‐state dynamics of Bi 3+ and Te 4+ in Cs2 SnCl6, but also a general approach to achieve single‐composition white‐light emitters based on lead‐free metal halides through ns 2 ‐metal ion co‐doping. Abstract : A strategy based on Bi 3+ /Te 4+ co‐doping was developed to achieve dual‐band‐tunable white‐light emission in perovskite‐derivative Cs2 SnCl6 microcrystals with a quantum yield of up to 68.3 %. Solid evidence including the transition in photoluminescence lifetime from milliseconds at 10 K to microseconds at 300 K was provided to unravel the photoluminescence originating from the inter‐configurational 3 P0, 1 → 1 S0 transitions of Bi 3+ /Te 4+ .