Implications of gas-barrier properties in realizing the self-recovery of photodegraded CsPbBr3perovskite nanocrystals

Research output: Contribution to journalArticlepeer-review


Fluorescent CsPbBr3perovskite nanocrystals (NCs) degraded by photoinduced desorption of surface ligands can exhibit self-recovery; however, irreversible oxidative damage from oxygen in the atmosphere must be avoided. In this work, gas-barrier polymer films made of ethylene vinyl alcohol (EVOH) and ethylene vinyl acetate (EVA) copolymers were investigated as sealing materials for CsPbBr3NC films. The NC film covered with EVOH showed photodegradation with blackening and photoluminescence quenching under light excitation, while self-recovery of the optical properties was observed during dark storage. These phenomena were attributed to the photoinduced desorption of surface ligands (and thus the formation of surface defects) and their re-adsorption, respectively. In contrast, self-recovery did not occur when an EVA film was used. X-ray photoelectron spectroscopy indicated the formation of Pb-O bonds for the EVA-coated film. Thus, EVOH, which has a lower oxygen permeability than EVA, successfully prevented irreversible damage by permeated oxygen. This is an important finding for the reuse or lifetime-extension of CsPbBr3NCs.

Original languageEnglish
Pages (from-to)102-107
Number of pages6
JournalJournal of Materials Chemistry C
Issue number1
Publication statusPublished - 2022 Jan 7

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry


Dive into the research topics of 'Implications of gas-barrier properties in realizing the self-recovery of photodegraded CsPbBr<sub>3</sub>perovskite nanocrystals'. Together they form a unique fingerprint.

Cite this