Lead-free halide perovskites are widely used in the field of optoelectronics and photocatalysis. However, extremely moisture-sensitive nature of halide perovskites set a huge hurdle for realizing photoluminescence and photocatalytic activities in water.
Recently, a research group led by Prof. HAN Keli from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) realized functional regulation of photoluminescence and photocatalysis in lead-free perovskites through ion substitution.
This study was published in Angewandte Chemie International Edition on August 5.
A tunable strategy to design a series of Cs2PtxSn1-xCl6 with controlling photoluminescence and photocatalytic hydrogen evolution activity (Image by YIN Hang)
The researchers synthesized a series of Cs2PtxSn1-xCl6 with high water-stability, which show switchable photoluminescence and photocatalytic functions by varying the amount of Pt4+ substitution.
They found that the photocatalytic function could be activated by low content of Pt4+ substitution (x=0.05), showing photocatalytic hydrogen evolution activity in water. And the photoluminescence function could be activated by high content of Pt4+ substitution (x=0.75).
"Optical spectroscopy study revealed that the switch between photoluminescence and photocatalysis function was controlled by sub-bandgap states," said Prof HAN.
This work was supported by National Natural Science Foundation of China, the National Key Research and Development Program of China, the Science Challenging Program and the Basic Research Program of Shandong University. (Text by YIN Hang)