期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 124, 期 21, 页码 11625-11630出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.0c02453
关键词
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资金
- National Natural Science Foundation of China [21522106, 21971117, 21904071, 11804084]
- State Key Laboratory of Fine Chemicals [KF1818]
- 111 project from China [B18030]
- State Key Laboratory of Rare Earth Resource Utilization [RERU2019001]
- Functional Research Funds for the Central Universities, Nankai University [ZB19500202]
As illumination is a fundamental human need, the exploration of illumination sources possessing high efficiency and broadband white-light emission is highly desirable. Zero-dimensional (0D) metal halide compounds are promising candidates, and some lead-free antimony-containing compounds exhibit bimodal white-light emissions. However, their origins are still unclear. To solve this issue, we designed and prepared a new family of 0D metal halide compounds consisting of [M(18-crown-6)](+) (M = NH4, Rb) and SbX52- (X = Cl, Br) units. We found that the emission profiles of 0D compounds are distinct to and well separated from that of 18-crown-6 ether, excluding the intraligand charge transfer mechanism proposed in several reports. Femtosecond transient absorption data and the compositional dependence of photophysical properties imply that bimodal white-light emission is induced by both singlet state and triplet state of the self-trapped excitons ((STE)-S-1 and (STE)-S-3) coupled to metal halides. These 0D compounds are also very efficient emitters, with a white-light photoluminescence quantum yield as high as 54%.
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