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Photo-stability of CsPbBr3 perovskite quantum dots for optoelectronic application

Chen, Junsheng LU ; Liu, Dongzhou; Al-Marri, Mohammed J.; Nuuttila, Lauri; Lehtivuori, Heli and Zheng, Kaibo LU (2016) In SCIENCE CHINA Materials 59(9). p.719-727
Abstract
Due to their superior photoluminescence (PL) quantum yield (QY) and tunable optical band gap, all-inorganic CsPbBr3 perovskite quantum dots (QDs) have attracted intensive attention for the application in solar cells, light emitting diodes (LED), photo detectors and laser devices. In this scenario, the stability of such materials becomes a critical factor. We hereby investigated the long-term stability of as-synthesized CsPbBr3 QDs suspended in toluene at various environmental conditions involving the light illumination, atmosphere, and temperature. We found light illumination would induce dramatic degradation of CsPbBr3 QDs reflecting as decreasing absorbance and PL intensity together with red-shifted emission band. Such light instability... (More)
Due to their superior photoluminescence (PL) quantum yield (QY) and tunable optical band gap, all-inorganic CsPbBr3 perovskite quantum dots (QDs) have attracted intensive attention for the application in solar cells, light emitting diodes (LED), photo detectors and laser devices. In this scenario, the stability of such materials becomes a critical factor. We hereby investigated the long-term stability of as-synthesized CsPbBr3 QDs suspended in toluene at various environmental conditions involving the light illumination, atmosphere, and temperature. We found light illumination would induce dramatic degradation of CsPbBr3 QDs reflecting as decreasing absorbance and PL intensity together with red-shifted emission band. Such light instability can be attributed to the photo-induced surface degradation and aggregation. The steady-state spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD) technics verified that CsPbBr3 QDs trend to aggregate to form larger particles under continuous light soaking. In addition, decreasing PL QY of the QDs during light soaking indicates the formation of trap sites. Such trap sites lead to the red-shifted emission with increasing PL lifetime. Our work reveals that the main origin of instability in CsPbBr3 QDs and provide reference to engineer such QDs towards optimal device application. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
perovskite, quantum dots, Photo-stability
in
SCIENCE CHINA Materials
volume
59
issue
9
pages
9 pages
publisher
Science in China Press
ISSN
2095-8226
DOI
10.1007/s40843-016-5123-1
language
English
LU publication?
yes
id
96b0cb9d-dc0f-4391-87d6-ffbb8b0544b4
date added to LUP
2018-02-20 15:17:45
date last changed
2018-11-21 21:38:08
@article{96b0cb9d-dc0f-4391-87d6-ffbb8b0544b4,
  abstract     = {Due to their superior photoluminescence (PL) quantum yield (QY) and tunable optical band gap, all-inorganic CsPbBr3 perovskite quantum dots (QDs) have attracted intensive attention for the application in solar cells, light emitting diodes (LED), photo detectors and laser devices. In this scenario, the stability of such materials becomes a critical factor. We hereby investigated the long-term stability of as-synthesized CsPbBr3 QDs suspended in toluene at various environmental conditions involving the light illumination, atmosphere, and temperature. We found light illumination would induce dramatic degradation of CsPbBr3 QDs reflecting as decreasing absorbance and PL intensity together with red-shifted emission band. Such light instability can be attributed to the photo-induced surface degradation and aggregation. The steady-state spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD) technics verified that CsPbBr3 QDs trend to aggregate to form larger particles under continuous light soaking. In addition, decreasing PL QY of the QDs during light soaking indicates the formation of trap sites. Such trap sites lead to the red-shifted emission with increasing PL lifetime. Our work reveals that the main origin of instability in CsPbBr3 QDs and provide reference to engineer such QDs towards optimal device application.},
  author       = {Chen, Junsheng and Liu, Dongzhou and Al-Marri, Mohammed J. and Nuuttila, Lauri and Lehtivuori, Heli and Zheng, Kaibo},
  issn         = {2095-8226},
  keyword      = {perovskite,quantum dots,Photo-stability},
  language     = {eng},
  month        = {09},
  number       = {9},
  pages        = {719--727},
  publisher    = {Science in China Press},
  series       = {SCIENCE CHINA Materials},
  title        = {Photo-stability of CsPbBr3 perovskite quantum dots for optoelectronic application},
  url          = {http://dx.doi.org/10.1007/s40843-016-5123-1},
  volume       = {59},
  year         = {2016},
}