Gram-Scale Synthesis of Blue-Emitting CH₃NH₃PbBr₃ Quantum Dots Through Phase Transfer Strategy

Reprecipitation synthesis has been demonstrated to be a simple and convenient route to fabricate high quality perovskite quantum dots toward display applications, whereas the limited chemical yields (< 10%) and difficulty of purification limited its further application. In order to overcome this issue, we here report a modified emulsion synthesis by introducing phase transfer strategy, which achieving effective extraction of newly formed perovskite quantum dots into non-polar solvent and avoiding the degradation of perovskite quantum dots to a large extent. Based on this strategy, gram-scale CH₃NH₃PbBr₃ quantum dots were fabricated in 10 mL (~0.02 mol/L) colloidal solution with chemical yields larger than 70%. The as fabricated CH₃NH₃PbBr₃ quantum dots exhibit an emission peak of 453 nm and a full width at half maximum of only 14 nm. Moreover, electroluminescent devices based on blue emitting CH₃NH₃PbBr₃ quantum dots were also explored with a maximum luminance of 32 cd/m², showing potential applications in blue light emitting devices.