Low-temperature synthesis of zirconium silicate stabilized perovskite quantum dot composite material

Perovskite quantum dots (PQDs) have been devised as an efficient narrow half-width phosphor and received extensive attention due to their high photoluminescence quantum yield (PLQY), adjustable emission colour and high colour purity. However, the low stability of perovskite quantum dots seriously affects its performance and application. Here, we have proposed a simple ligand-assisted precipitation method to encapsulate PQDs in zirconium silicate (ZrSi). Owing to the special stacked structure and high specific surface area of ZrSi, the composite material exhibits extremely high humidity stability and thermal stability compared to pure PQDs. Both ZrSi/CH3NH3PbBr3 PQDs and ZrSi/CsPbBr3 PQDs prepared by ZrSi packaging exhibit excellent luminescence properties, and the three-colour phosphor composite prepared by changing the halogen ratio has a very high colour gamut. In addition, ZrSi/CH3NH3PbBr3 PQDs and ZrSi/CsPbBr3 PQDs assembled white light-emitting diodes (LEDs) also have very excellent optical properties. This work provides a new method for the synthesis of high-stability perovskite quantum dots for white LED and display materials by using stacked structure materials.