Enhancing the stability and water resistance of CsPbBr3 perovskite nanocrystals by using tetrafluoride and zinc oxide as protective capsules

Lead halide perovskite materials are popular in optoelectronic applications due to their excellent properties, while their instability is still a bottleneck for their potential application. In this work, sodium yttrium fluoride (NaYF 4 ) and zinc oxide (ZnO) were used as capsules to protect CsPbBr 3 nanocrystals, greatly enhancing the resistance of CsPbBr 3 nanocrystals to water and polar solvents. Water-resistant and stable luminescent CsPbBr 3 @NaYF 4 and CsPbBr 3 @ZnO nanocrystals were obtained by using a simple solution-phase method. These water-stable enhanced perovskite nanocrystals are suitable for long-term stable optoelectronic applications in the atmosphere.