Highly efficient blue-emitting bi-doped Cs2SnCl6 perovskite variant: photoluminescence induced by impurity doping

Zhifang Tan, Jinghui Li, Cheng Zhang, Zha Li, Qingsong Hu, Zewen Xiao, Toshio Kamiya, Hideo Hosono, Guangda Niu, Efrat Lifshitz, Yibing Cheng, Jiang Tang

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154 Citations (Scopus)


Lead halide perovskites show excellent optoelectronic properties but are unsatisfactory in terms of stability and toxicity. Herein, bismuth (Bi)-doped lead-free inorganic perovskites Cs2SnCl6:Bi are reported as blue emissive phosphors. Upon Bi doping, the originally nonluminous Cs2SnCl6 exhibits a highly efficient deep-blue emission at 455 nm, with a Stokes shift of 106 nm and a high photoluminescence quantum yield (PLQY) close to 80%. Hybrid density functional theory calculations suggest the preferred formation of [BiSn+VCl] defect complex, which is believed to be responsible for the optical absorption and the associated blue emission. The Cs2SnCl6:Bi also shows impressive thermal and water stability due to its inorganic nature and the formation of protective BiOCl layer. White light-emitting diodes (LEDs) are constructed using Cs2SnCl6:Bi and commercial yellow phosphors combined with commercial UV LED chips, giving the Commission Internationale de I'Eclairage (CIE) color coordinates of (0.36, 0.37). This work represents a significant step toward the realization of highly efficient, stable, and environmentally benign next-generation solid-state lighting.

Original languageEnglish
Article number1801131
Number of pages10
JournalAdvanced Functional Materials
Issue number29
Publication statusPublished - 18 Jul 2018


  • blue emission
  • impurity doping
  • lead-free
  • perovskite

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