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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Size effect of lead-free halide double perovskite on luminescence property

Author

  • Peigeng Han
  • Xue Zhang
  • Xin Mao
  • Bin Yang
  • Songqiu Yang
  • Zhaochi Feng
  • Donghui Wei
  • Weiqiao Deng
  • Tõnu Pullerits
  • Keli Han

Summary, in English

Lead-free halide double perovskites have gathered wide scientific interest since they are environmentally friendly and stable. However, compared to the lead perovskites, their optoelectronic properties are compromised. Herein we report a series of bulk lead-free mixed Bi-In halide double perovskites: Cs2AgBi1−xInxCl6 (0<x<1). The Cs2AgBi0.125In0.875Cl6 breaks the parity-forbidden transition and retains direct band gap structure, having warm-white light emission, with photoluminescence quantum efficiency (PLQE) of 70.3%, much higher than the PLQE of reported lead perovskite materials. Its exciton self-trapping dynamics is investigated. Meanwhile, the Cs2AgBi0.125In0.875Cl6 nanocrystals and Cs2AgBi0.125In0.875Cl6 microcrystals can be synthesized by modified hot injection and rapid cooling crystallization, respectively. The size effect of Cs2AgBi0.125In0.875Cl6 is studied on the photoluminescence (PL) property. Additionally, the bulk material exhibits excellent stability on exposure to light, humidity and air for more than 3 months. It is a promising candidate as highly efficient warm white-light emitting material for road lighting.

Department/s

  • eSSENCE: The e-Science Collaboration
  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2019-07-19

Language

English

Pages

1405-1413

Publication/Series

Science China Chemistry

Volume

62

Issue

10

Document type

Journal article

Publisher

Science in China Press

Topic

  • Other Chemistry Topics
  • Natural Sciences
  • Condensed Matter Physics

Keywords

  • bulk crystals
  • double perovskite
  • size effect
  • stability
  • warm white

Status

Published

ISBN/ISSN/Other

  • ISSN: 1674-7291