Room-temperature one-pot synthesis of highly stable SiO2-coated Mn-doped all-inorganic perovskite CsPb0.7Mn0.3Br0.75Cl2.25 quantum dots for bright white light-emitting diodes

In this paper, we report a simple one-pot strategy to synthesize highly stable SiO 2 -coated orange-yellow CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots with strong orange-yellow photoluminescence . The microstructure characterization indicates that the CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots were effectively encapsulated by the SiO 2 . The SiO 2 -coated CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots show higher humidity stability and thermal stability than the CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots without SiO 2 coating. The white light-emitting diodes (WLEDs) were obtained by coating orange-yellow CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 @SiO 2 and blue CsPbBrCl 2 @SiO 2 quantum dots on the ultraviolet gallium nitride light-emitting diode chip. The as-prepared white light-emitting diodes show bright white light emission with a color coordinate of (0.3347, 0.2825), color rendering index of 82 and correlated color temperature of 5329 K. The results provide a simple method to fabricate stable orange-yellow luminescent material for white light-emitting diodes.