Antimony doped Cs₂SnCl₆ with bright and stable emission

Abstract

Lead halide perovskites, with high photoluminescence efficiency and narrow-band emission, are promising materials for display and lighting. However, the lead toxicity and environmental sensitivity hinder their potential applications. Herein, a new antimony-doped lead-free inorganic perovskites variant Cs₂SnCl₆:xSb is designed and synthesized. The perovskite variant Cs₂SnCl₆:xSb exhibits a broadband orange-red emission, with a photoluminescence quantum yield (PLQY) of 37%. The photoluminescence of Cs₂SnCl₆:xSb is caused by the ionoluminescence of Sb³⁺ within Cs₂SnCl₆ matrix, which is verified by temperature dependent photoluminescence (PL) and PL decay measurements. In addition, the all inorganic structure renders Cs₂SnCl₆:xSb with excellent thermal and water stability. Finally, a white light-emitting diode (white-LED) is fabricated by assembling Cs₂SnCl₆:0.59%Sb, Cs₂SnCl₆:2.75%Bi and Ba₂Sr₂SiO₄:Eu²⁺ onto the commercial UV LED chips, and the color rendering index (CRI) reaches 81.

Keywords

perovskite / lead-free / antimony doping / orange-red emission

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51761145048, 61725401 and 51702107), the National Key R&D Program of China (No. 2016YFB0700702) and the China Postdoctoral Science Foundation (No. 2018M632843). The authors thank the Analytical and Testing Center of HUST and the facility support of the Center for Nanoscale Characterization and Devices, WNLO. The work at Tokyo Institute of Technology was conducted under the Tokodai Institute for Element Strategy (TIES) funded by the MEXT Elements Strategy Initiative to Form Core Research Center.

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