Solid State Melting Confinement Reaction Synthesis of CsPbBr3 Quantum Dots Embedded in Mesoporous SiO2 Microspheres for Light‐Emitting Diodes

Abstract

AbstractPerovskite quantum dots (PQDs) have attracted widespread attention in optoelectronic fields due to their excellent optical properties. However, their instability issue hampers their further development and practical application. Herein, CsPbBr3 PQDs embedded in mesoporous SiO2 microspheres (CsPbBr3 PQDs/MSs) are prepared by the high‐temperature solid‐phase melting method due to the confinement effect. The prepared CsPbBr3 PQDs/MSs are treated by saturated Na2SO4 to form PbSO4 precipitation to fulfill the mesoporous gap. And such treatment endows the QDs with excellent water, light irradiation, and heating stability. The prepared products can maintain over 80% of the original fluorescence intensity even when it is immersed in water for 2 weeks. The CsPbBr3 PQDs/MSs are utilized in the white light‐emitting diode device with Commission Internationale de L'Eclairage color coordinates of (0.3407, 0.3357) at 20 mA, and exhibit excellent photo stability at high power.