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

Organic-inorganic methylammonium lead halide CH₃NH₃PbBr₃ (MAPbBr₃) 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 MAPbBr₃ QDs through encapsulating them in ZrO₂ sol framework. This three-dimensional network ZrO₂ colloid forms a good coating on the surface of MAPbBr₃ QDs. The ZrO₂ sol protected MAPbBr₃ QDs showed greatly improved acid, base and ultraviolet light illumination resistance. The photoluminescence intensity of MAPbBr₃/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.