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The instability of metal halide perovskites upon exposure to moisture or heatstrongly hampers their applications in optoelectronic devices. Here, we reportthe large-yield synthesis of highly water-resistant total-inorganic greenluminescent CsPbBr3/CsPb2Br5 core/shell heteronanocrystals (HNCs) by developingan in situ phase transition approach. It is implemented via water-driven phasetransition of the original monoclinic CsPbBr3 nanocrystal and the resultanttetragonal CsPb2Br5 nanoshell has small lattice mismatch with the CsPbBr3 core,which ensures formation of an epitaxial interface for the yieldedCsPbBr3/CsPb2Br5 HNCs. These HNCs maintain nearly 100% of the originalluminescence intensity after immersion in water for eleven months and theluminescence intensity drops only to 81.3% at 100 {\deg}C. The transientluminescence spectroscopy and density functional theory calculation reveal thatthere are double radiative recombination channels in the core CsPbBr3nanocrystal, and the electron potential barrier provided by the CsPb2Br5nanoshell significantly improves the exciton recombination rate. A prototypequasi-white light-emitting device based on these robust CsPbBr3/CsPb2Br5 HNCsis realized, showing their strong competence in solid-state lighting and widecolor-gamut displays.

chemistry of materials

In Situ Phase-Transition Crystallization of All-Inorganic  Water-Resistant Exciton-Radiative Heteroepitaxial CsPbBr3-CsPb2Br5 Core-Shell  Perovskite Nanocrystals