Highly efficient and blue-emitting CsPbBr3 quantum dots synthesized by two-step supersaturated recrystallization.

Highly efficient and blue-emitting CsPbBr3 quantum dots were successfully synthesized by two-step supersaturated recrystallization under ambient condition. This method could control the particle size within 2.8 nm, thus resulting in strong quantum confinement effect of the products. The as-synthesized CsPbBr3 quantum dots presented outstanding optical properties with highest photo-luminescence quantum yield of 87.20 % and longest PL lifetime of 12.24 ns. The blue light-emitting diode made from the CsPbBr3 quantum dots exhibited a CIE coordinate (0.14,0.10), in good agreement with the standard blue CIE coordinate (0.14,0.08) of National Television System Committee (NTSC).