In Situ Growth of CsPbBr3 Perovskite Nanocrystals in Lead-Based Matrix toward Significantly Enhanced Water/Photo Stabilities

Perovskite nanocrystals (NCs) are considered as the next-generation platforms for optoelectronic applications, but their poor stability greatly restricts their development. Here, we present a facile composite strategy to synthesize highly stable CsPbBr3/Pb-MA composite by in situ embedding the CsPbBr3 NCs in a C16H14Br2O6Pb2 (Pb-MA) organometallic compound (MOC). The CsPbBr3/Pb-MA composite powders show intense green emission at 519 nm, with a photoluminescence quantum yield of about 48.5% and a full width at half-maximum of about 17 nm. More interestingly, benefitted from the protection of MOC, the CsPbBr3/Pb-MA composites can maintain 43% and 83% of initial intensity after being illuminated under blue light for 36 h and being immersed in water for 192 h, respectively. Compared to the original CsPbBr3 NCs, the light/water stability of CsPbBr3/Pb-MA composites is enhanced by about 40 and 700 times (the PL intensities maintain at about 60% of the initial one), respectively. As a proof-of-concept, the as-fabricated devices exhibit a wide color gamut, 97.7% and 98.2% of Rec. 2020 for white light-emitting diodes and laser diodes, respectively. These findings demonstrate that the combination of MOC and perovskite NCs is an optimized strategy for the exploitation of high-performance perovskite composites for their future optoelectronic applications.