One- And Two-Photon Excited Photoluminescence and Suppression of Thermal Quenching of CsSnBr3Microsquare and Micropyramid

Zong Yu Wu, Jie Hao Zhuang, Yu Tsung Lin, Yu Hsun Chou, Pin Chieh Wu, Chung Lin Wu, Peter Chen, Hsu Cheng Hsu

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Thermal photoluminescence (PL) quenching is fundamentally important for perovskite optoelectronic applications. Herein, we investigated PL characteristics of CsSnBr3 microsquares and micropyramids synthesized by chemical vapor deposition (CVD) and their PL quenching behavior at high temperature. These microstructures have favorable PL performances in ambient atmosphere. Under two-photon excitation, we observed whispering gallery modes (WGMs) in microsquares and amplified spontaneous emission (ASE) in micropyramids. Reversible PL losses due to thermal effect were observed for both samples. Monotonic blue shifts in PL emission upon temperature increase suggest a band gap widening associated with an emphanisis effect. Temperature-dependent spectral line width analysis reveals that a line width broadening is attributed to the dominant electron-longitudinal optical phonon interaction. The estimated activation energy of thermally assisted nonradiative recombination for CsSnBr3 microsquares and micropyramids is over 310 meV by the Arrhenius equation, which is higher than CsPbBr3. These results prove that CsSnBr3 exhibits better thermal stability than Pb-based perovskites.

Original languageEnglish
Pages (from-to)19613-19620
Number of pages8
JournalACS nano
Volume15
Issue number12
DOIs
Publication statusPublished - 2021 Dec 28

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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