Ultraviolet light induced degradation of luminescence in CsPbBr3 perovskite nanocrystals

The degradation of luminescence in CsPbBr3 NC films under UV light illumination is attributed to the photo-oxidation of lead atoms on the NC surface. [Display omitted] •The degradation of PL in CsPbBr3 nanocrystals under UV illumination was studied.•The degradation was attributed to the photo-oxidat...

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Published inMaterials research bulletin Vol. 102; pp. 86 - 91
Main Authors Li, Ji, Wang, Li, Yuan, Xi, Bo, Baoxue, Li, Haibo, Zhao, Jialong, Gao, Xin
Format Journal Article
LanguageEnglish
Published United States Elsevier Ltd 01.06.2018
Subjects
AIR
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
CsPbBr3
Degradation
ILLUMINANCE
LEAD CARBONATES
LEAD OXIDES
LIGHT EMITTING DIODES
Luminescence
Nanocrystals
NANOSTRUCTURES
OXIDATION
PEROVSKITE
PHOTOLUMINESCENCE
RADIATION EFFECTS
ULTRAVIOLET RADIATION
X-RAY PHOTOELECTRON SPECTROSCOPY
Degradation
Perovskite
CsPbBr3
Nanocrystals
Luminescence
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Summary:The degradation of luminescence in CsPbBr3 NC films under UV light illumination is attributed to the photo-oxidation of lead atoms on the NC surface. [Display omitted] •The degradation of PL in CsPbBr3 nanocrystals under UV illumination was studied.•The degradation was attributed to the photo-oxidation of lead atoms on NC surface.•The PbCO3 and PbO phases were observed after long illumination time.•The change in PL intensity, peak energy, and linewidth as well as lifetimes under illumination was discussed. Perovskite nanocrystals (NCs) have been applied in light emitting diodes, but their stability is always the decisive factor to limit the practical application of devices. In this work, the influence of ultraviolet light illumination on the structural and luminescent properties of CsPbBr3 NC films with emissions of 495 and 520 nm was studied. It was demonstrated that the CsPbBr3 NC films exhibited significant degradation of photoluminescence (PL) under the illumination in air. The PbCO3 and PbO phases in CsPbBr3 NC films were observed after long illumination time with X-ray photoemission spectroscopy. The temperature-dependent PL spectra revealed that large amount of nonradiative traps were formed with increasing illumination time. The PL intensities, band energies, and bandwidths as well as PL lifetimes of the illuminated CsPbBr3 NC films were analyzed. The experimental results indicated that the PL degradation was attributed to the photo-oxidation of NCs under the illumination.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2018.02.021