Controlling Photoluminescence and Photocatalysis Activities in Lead‐Free Cs 2 Pt x Sn 1− x Cl 6 Perovskites via Ion Substitution

Autor: Junsheng Chen, Hang Yin, Ke-Li Han, Bin Yang, Qingkun Kong, Daoyuan Zheng, Songqiu Yang, Panwang Zhou, Peng Guan, Tõnu Pullerits
Rok vydání: 2021
Předmět:
Zdroj: Angewandte Chemie International Edition. 60:22693-22699
ISSN: 1521-3773
1433-7851
DOI: 10.1002/anie.202108133
Popis: Lead-free halide perovskites have triggered interest in the field of optoelectronics and photocatalysis because of their low toxicity, and tunable optical and charge-carrier properties. From an application point of view, it is desirable to develop stable multifunctional lead-free halide perovskites. We have developed a series of Cs2 Ptx Sn1-x Cl6 perovskites (0≤x≤1) with high stability, which show switchable photoluminescence and photocatalytic functions by varying the amount of Pt4+ substitution. A Cs2 Ptx Sn1-x Cl6 solid solution with a dominant proportion of Pt4+ shows broadband photoluminescence with a lifetime on the microsecond timescale. A Cs2 Ptx Sn1-x Cl6 solid solution with a small amount of Pt4+ substitution exhibits photocatalytic hydrogen evolution activity. An optical spectroscopy study reveals that the switch between photoluminescence and photocatalysis functions is controlled by sub-band gap states. Our finding provides a new way to develop lead-free multifunctional halide perovskites with high stability.
Databáze: OpenAIRE
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