Lead-free cesium tin halide nanocrystals for light-emitting diodes and color down conversion

K. P.O. Mahesh*, Che Yu Chang, Wei Li Hong, Tzu Hsiang Wen, Pei Hsuan Lo, Hao Zhe Chiu, Ching Ling Hsu, Sheng Fu Horng, Yu Chiang Chao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Organometal halide perovskites are attracting a great deal of attention because of their long carrier diffusion lengths, wide wavelength tunability, and narrow-band emission. However, the toxicity of lead has caused considerable environmental and health concerns. In this work, lead-free cesium tin halide nanocrystals are synthesized and investigated. CsSnBr3and CsSnI3nanocrystals, 25 and 7 nm in size, are synthesized by a facile hot injection method. Absorption spectroscopy, photoluminescence spectroscopy, and X-ray diffraction were used to understand their structural and optical properties. CsSnBr3and CsSnI3nanocrystals show emission peaks at 683 and 938 nm, respectively. These nanocrystals show shelf stability for a few months. Temperature-dependent photoluminescence is utilized to know more about fundamental physical parameters, such as exciton binding energy, charge carrier-phonon interactions and band gap. Light-emitting diodes and color down-conversion films are also demonstrated using these lead free perovskite nanocrystals.

Original languageEnglish
Pages (from-to)37161-37167
Number of pages7
JournalRSC Advances
Volume10
Issue number61
DOIs
Publication statusPublished - 2020 Oct 7

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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