High-Temperature Photoluminescence of CsPbX3 (X = Cl, Br, I) Nanocrystals

Benjamin T. Diroll, Georgian Nedelcu, Maksym V. Kovalenko, Richard D. Schaller

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

Recent synthetic developments have generated intense interest in the use of cesium lead halide perovskite nanocrystals for light-emitting applications. This work presents the photoluminescence (PL) of cesium lead halide perovskite nanocrystals with tunable halide composition recorded as function of temperature from 80 to 550 K. CsPbBr3 nanocrystals show the highest resilience to temperature while chloride-containing samples show relatively poorer preservation of photoluminescence at elevated temperatures. Thermal cycling experiments show that PL loss of CsPbBr3 is largely reversible at temperatures below 450 K, but shows irreversible degradation at higher temperatures. Time-resolved measurements of CsPbX3 samples show an increase in the PL lifetime with temperature elevation, consistent with exciton fission to form free carriers, followed by a decrease in the apparent PL lifetime due to trapping. PL persistence measurements and time-resolved spectroscopies implicate thermally assisted trapping, most likely to halogen vacancy traps, as the mechanism of reversible PL loss.

Original languageEnglish
Article number1606750
JournalAdvanced Functional Materials
Volume27
Issue number21
DOIs
Publication statusPublished - Jun 6 2017

Keywords

  • CsPbX
  • high-temperature
  • perovskites
  • photoluminescence
  • stability

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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