Facile Synthesis of Stable CsPbBr3/SiO2 Solids Via 3-(Dimethoxymethylsilyl)propylamine: Coordination of Silica Encapsulation and Surface Passivation

Embedding cesium lead bromide perovskite quantum dots (PQDs) into silica matrix has been proved as an efficient way to enhance the stability of PQDs. Here, we firstly report 3-(Dimethoxymethylsilyl)propylamine (DEMSPA) as a precursor to form coating shell. The PQDs solution and DEMSPA were mixed in the open air at the room temperature. The final product was extracted from the sol-gel solution. The luminescent properties of QDs is over 60 d of storage under ambient conditions. The PQDs/SiO2 composite powder possesses the photoluminescence quantum yield (PLQY) of 63.5%. Coating the powder on the blue chips, the white light-emitting diode (LED) exhibits a wide color gamut with 123.6% of National Television System Committee (NTSC) color triangle area. The PQDs/SiO2 composite has been proved cubic phase structure, indicating good crystallinity. The good crystallinity enables QDs to be applied as broad optoelectronic devices.