Photo-stability of CsPbBr3 perovskite quantum dots for optoelectronic application
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/96b0cb9d-dc0f-4391-87d6-ffbb8b0544b4
- author
- Chen, Junsheng LU ; Liu, Dongzhou ; Al-Marri, Mohammed J. ; Nuuttila, Lauri ; Lehtivuori, Heli and Zheng, Kaibo LU
- organization
- publishing date
- 2016-09-20
- 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}}, keywords = {{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}}, doi = {{10.1007/s40843-016-5123-1}}, volume = {{59}}, year = {{2016}}, }