Polymer-assisted room-temperature synthesis of highly luminescent perovskite nanocrystals with superior water resistance for WLED

Perovskite nanocrystal with good environmental stability is one of the most urgent problems to be solved in practical applications. Herein we report a fast facile polymer-assisted synthesis of all-inorganic perovskite nanocrystals (denoted as IPNCs) with environmental stability. The IPNCs with tunable bandgap and photoluminescence quantum yield (PLQY) (52%-93%) can be fabricated within 10 s at room temperature. The Poly (methyl methacrylate) (PMMA) polymer here not only directly acts as a ligand and reaction sites to confine the nucleation and crystal growth of IPNCs, but also facilitate the preparation of highly luminescent IPNCs-based film with superior water resistance. We also demonstrate its potential application in white light-emitting diodes (WLEDs) by combining green and red IPNCs-based film with a blue LED chips.