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

Research output: Contribution to journalArticleResearchpeer-review

154 Citations (Scopus)

Abstract

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
Volume28
Issue number29
DOIs
Publication statusPublished - 18 Jul 2018

Keywords

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

Cite this