Synthesis of thermally stable and highly luminescent spherical shaped ligand-free Cs 4 PbBr 6 nanospheres with a single polar solvent

Periyayya Uthirakumar, Jin Hyeon Yun, M. Devendiran, Won Wook Lee, In-Hwan Lee

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2 Citations (Scopus)

Abstract

We demonstrate a simple method to synthesis thermally stable and green luminescent ligand-free Cs 4 PbBr 6 nanospheres (NS) with a polar solvent. In this approach, a single polar solvent, N,N-dimethylformamide (DMF) is sufficient enough to convert precursors into cubic shaped ligand-free Cs 4 PbBr 6 crystals. Further, the morphology of cubic shaped Cs 4 PbBr 6 crystals is reformed into spherical shaped Cs 4 PbBr 6 NS by prolonged DMF washing (overnight stirring, 15 h). Besides, the reduction in average particle size of spherical shaped Cs 4 PbBr 6 NS (~70 nm) to one-fourth to the original size of cubic Cs 4 PbBr 6 crystals (~310 nm). The ligand-free spherical shaped Cs 4 PbBr 6 NS showed a high photoluminescence quantum yield of 42.5%, which could compete the conventional ligand mediated Cs 4 PbBr 6 crystals. Moreover, spherical shaped Cs 4 PbBr 6 NS exhibited a high thermal stability even at 200 °C without sacrificing luminescence intensity. Hence, it is foreseen that this approach brings a new strategy to prepare ligand-free Cs 4 PbBr 6 NS as a promising material in optoelectronic devices.

Original languageEnglish
Pages (from-to)163-169
Number of pages7
JournalJournal of Luminescence
Volume209
DOIs
Publication statusPublished - 2019 May 1

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Keywords

  • Cs PbBr
  • Ligand-free
  • Nanospheres
  • Perovskites
  • Single solvent

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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