Enhancing acid, base and UV light resistance of halide perovskite CH3NH3PbBr3 quantum dots by encapsulation with ZrO2 sol

Organic-inorganic methylammonium lead halide CH3NH3PbBr3 (MAPbBr(3)) perovskite quantum dots (QDs) have great potential in opto-electric devices such as solar cell, laser and light-emitting diode. The greatest challenge for halide perovskite QDs is the poor stability in the environment of air, moisture, acid, base and light illumination. Herein, we introduce a brief, feasible and efficient method to improve the stability of MAPbBr(3) QDs through encapsulating them in ZrO2 sol framework. This three-dimensional network ZrO2 colloid forms a good coating on the surface of MAPbBr(3) QDs. The ZrO2 sol protected MAPbBr 3 QDs showed greatly improved acid, base and ultraviolet light illumination resistance. The photoluminescence intensity of MAPbBr(3)/ZrO2 nanocomposites remained at 95% of the initial value after 4.5 h in base environment and 90% after 10 h in acid environment. The detailed mechanism was discussed. (C) 2019 Elsevier B.V. All rights reserved.