期刊
ADVANCED OPTICAL MATERIALS
卷 7, 期 24, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201901335
关键词
2D halide perovskites; photoluminescence; white-light emission
资金
- National Natural Science Foundations of China [51722202, 51972118]
- Fundamental Research Funds for the Central Universities [D2190980]
- Guangdong Provincial Science & Technology Project [2018A050506004]
With single-component photoinduced white-light (WL) emission, low-dimensional hybrid halide perovskites have emerged as a new generation of luminescent materials; however, the effect of halogens on the intrinsic light emissions and the corresponding mechanisms is still unknown. Herein, the investigation of a family of two-dimensional (2D) hybrid perovskites R2PbBr4-xClx (R = BA(+), PMA(+), PEA(+); x = 0, 1, 2, 3, 4) highlights the influence of halogens on intrinsic emission to reveal the dependence of the photoluminescence on the nature and contribution of the halogens. Ultrabroad emissions covering the entire visible-light region are achieved in the halogen hybrid systems with the stoichiometry of R2PbBr2Cl2 (R = BA(+), PMA(+), PEA(+)), showing their potential as single-component WL phosphors in solid-state lighting devices. The origin of the WL emissions is the synergistic recombination emission of free excitons and self-trapped excitons. The ratio of halogens (Br/Cl) is confirmed to be a critical factor to fine-tune the intrinsic emission properties. This work provides a feasible strategy to achieve single-component WL emission in 2D hybrid perovskites, and proposes a method for regulating halogen contents for optimizing luminescent properties.
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