Effect of synthesis methods on photoluminescent properties for CsPbBr3 nanocrystals: Hot injection method and conversion method

Fengying Zhang, Junsheng Chen, Ying Zhou, Rongxing He, Kaibo Zheng*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Multiple facile synthetic strategies for all inorganic perovskite CsPbBr3 nanocrystals (NCs) have been established and developed, profiting from their excellent performance and great potential applied in the field of photonic and optoelectronic. Here, CsPbBr3 NCs were synthesized by both hot injection method (method 1) and conversion method (method 2), and the discrepancy of their photophysical properties is elucidated via the complementary studies between time-resolved photoluminescence (TRPL) and transient-absorption (TA) spectroscopy. We found that CsPbBr3 NCs prepared by conversion method exhibited lower PL quantum yield (QY), which was ascribed to the larger partition of the NCs being passivated from the quenchers from the deep trap states. On the other hand, we also observed different radiative recombination rates between two samples which should be due to various trapping/detrapping times prior to the radiative recombination of the charge carriers in two samples. These results provide better guidance for the development and improvement of synthesis methodology for perovskite NCs.

Original languageEnglish
Article number117023
JournalJournal of Luminescence
Volume220
Number of pages6
ISSN0022-2313
DOIs
Publication statusPublished - 2020

Keywords

  • Perovskite nanoparticles
  • Radiative recombination
  • Synthetic strategy
  • Trap states

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