Journal
PHYSICA B-CONDENSED MATTER
Volume 599, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physb.2020.412488
Keywords
Cu-substituted; Luminescent property; Stability
Categories
Funding
- National Natural Science Foundation of China [51402125]
- China Postdoctoral Science Foundation [2017M612175]
- Natural Science Foundation of Shandong Province [ZR2016QL004]
- Special Fund for the Postdoctoral Innovation Project of Shandong Province [201603061]
- Research Fund for the Post Doctorate Project of University of Jinan [XBH1607]
- Research Fund for the Doctoral Program of University of Jinan [XBS1447]
- Natural Science Foundation of University of Jinan [XKY1515]
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The toxicity and stability of all-inorganic perovskite quantum dots are major challenge to be addressed in its commercialization process. Here, the toxicity of lead is reduced while improving the optical properties of quantum dots via replacing Pb2+ ions in CsPbBr3 perovskites quantum dots with low-toxicity and costeffectiveness Cu2+ cations. The PL emission and absorption peaks of quantum dots appear blue shift due to lattice shrinkage caused by copper ion doping. At the same time, we also observed that with the increase of Cu2+ doping concentration, the fluorescence lifetime of quantum dots decreased from 40.66 ns to 8.23 ns. Next, the slim CsPbBr3:Cu@SiO2 core-shell QDs were synthesized via a simply one-step synthesis method. Compared with the original CsPbBr3:Cu QDs, the stability of the quantum dots after coated has been significantly improved. Benefiting from this effective cladding strategy, these CsPbBr3:Cu@SiO2 can be well used for manufacturing high-performance perovskite LEDs.
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