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

Research output: Contribution to journalArticlepeer-review

1 Citation (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

  • Chemistry(all)
  • Chemical Engineering(all)

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