期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 14, 页码 11739-11746出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b18750
关键词
perovskite nanocrystals; ion exchange; photoluminescence tuning; Mn2+ emission; white light LEDs
资金
- National Natural Science Foundation of China [51722202, 91622125, 51572023]
- Natural Science Foundations of Beijing [2172036]
The unification of tunable band edge (BE) emission and strong Mn2+ doping luminescence in all-inorganic cesium lead halide perovskite nanocrystals (NCs) CsPbX3 (X = Cl and Br) is of fundamental importance in fine tuning their optical properties. Herein, we demonstrate that benefiting from the differentiation of the cation/anion exchange rate, ZnBr2 and preformed CsPb1-xCl3:xMn(2+) NCs can be used to obtain high Br- content Cs(Pb1-x-zZnz)(ClyBr(1-y))(3):xMn(2+) perovskite NCs with strong Mn2+ emission, and the Mn2+ substitution ratio can reach about 22%. More specifically, the fast anion exchange could be realized by the soluble halide precursors, leading to anion exchange within a few seconds as observed from the strong BE emission evolution, whereas the cation exchange instead generally required at least a few hours; moreover, their exchange mechanism and dynamics process have been evaluated. The Mn2+ emission intensity could be further varied by controlling the replacement of Mn2+ by Zn2+ with prolonged ion exchange reaction time. White light emission of the doped perovskite NCs via this cation/anion synergistic exchange strategy has been realized, which was also successfully demonstrated in a prototype white light-emitting diode (LED) device based on a commercially available 365 nm LED chip.
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