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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Lead-Free, Air-Stable All-Inorganic Cesium Bismuth Halide Perovskite Nanocrystals

Author

  • B Yang
  • Junsheng Chen
  • Feng Hong
  • Xin Mao
  • Kaibo Zheng
  • Songqiu Yang
  • Yajuan Li
  • Tõnu Pullerits
  • Weiqiao Deng
  • Keli Han

Summary, in English

Lead-based perovskite nanocrystals (NCs) have outstanding optical properties and cheap synthesis conferring them a tremendous potential in the field of optoelectronic devices. However, two critical problems are still unresolved and hindering their commercial applications: one is the fact of being lead-based and the other is the poor stability. Lead-free all-inorganic perovskite Cs3Bi2X9 (X=Cl, Br, I) NCs are synthesized with emission wavelength ranging from 400 to 560nm synthesized by a facile room temperature reaction. The ligand-free Cs3Bi2Br9 NCs exhibit blue emission with photoluminescence quantum efficiency (PLQE) about 0.2%. The PLQE can be increased to 4.5% when extra surfactant (oleic acid) is added during the synthesis processes. This improvement stems from passivation of the fast trapping process (2-20ps). Notably, the trap states can also be passivated under humid conditions, and the NCs exhibited high stability towards air exposure exceeding 30days.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2017

Language

English

Pages

12471-12475

Publication/Series

Angewandte Chemie - International Edition

Volume

56

Issue

41

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Physical Chemistry
  • Condensed Matter Physics

Keywords

  • Bismuth
  • Lead-free
  • Nanocrystals
  • Perovskites
  • Photoluminescence

Status

Published

ISBN/ISSN/Other

  • ISSN: 1433-7851