Synthesis of double emission Mn2+ doped CsPb (Cl/Br)3/SiO2 nanocrystals under the ethanol solution

Perovskite quantum dots (QDS) are promising candidate optoelectronics application materials for their excellent tuning performance and high photoluminescence quantum yield. Herein, we report a strategy to synthesize MnCl2-doped CsPbBr3 NCs and accomplish adjusting their optical properties in wide color gamut. The colloidal MnCl2-doped CsPbBr3 NCs was synthesized by adding CsPbBr3 powder and MnCl2 in anhydrous ethanol solution, and the double emission nanocrystals with tunable spectra were prepared successfully. PL, lifetime absorption, PLQY, XRD, TEM were tested and encapsulated in the device. Through testing, the luminescence mechanism of Mn2+ doped perovskite quantum dots is discussed in detail. After doping Mn2+, the energy of quantum dots is transferred to Mn2+, which causes the energy level transition. The material emits orange yellow light, and the best material PLQY can reach 45.2%. XRD and TEM tests show that they have good crystallinity. Finally, we encapsulate it and prepare white LED. Compared with other ion exchange methods, MnCl2 can be dissolved indefinitely in ethanol solution, so MnCl2 can be prepared with arbitrary doping ratio of manganese doped CsPb(Cl/Br)3 nanocrystals. This method is simple and can be used in mass production, which lays a foundation for industrial production.