Dual-Band-Tunable White-Light Emission from Bi3+ /Te4+ Emitters in Perovskite-Derivative Cs2 SnCl6 Microcrystals.
Angew Chem Int Ed Engl
; 61(9): e202116085, 2022 Feb 21.
Article
en En
| MEDLINE
| ID: mdl-34981626
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 Bi3+ /Te4+ co-doped perovskite derivative Cs2 SnCl6 microcrystals. Owing to the strong electron-phonon coupling and efficient energy transfer from Bi3+ to Te4+ , the microcrystals exhibited broad dual-band white-light emission originating from the inter-configurational 3 P0,1 â1 S0 transitions of Bi3+ and Te4+ , with good stability and a high photoluminescence (PL) quantum yield of up to 68.3 %. Specifically, a remarkable transition in Bi3+ -PL lifetime from milliseconds at 10â
K to microseconds at 300â
K was observed, as solid evidence for the isolated Bi3+ emission. These findings provide not only new insights into the excited-state dynamics of Bi3+ and Te4+ in Cs2 SnCl6 , but also a general approach to achieve single-composition white-light emitters based on lead-free metal halides through ns2 -metal ion co-doping.
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MEDLINE
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En
Revista:
Angew Chem Int Ed Engl
Año:
2022
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Article
País de afiliación:
China