Cs(Pb,Mn)Br3 Quantum Dots Glasses with Superior Thermal Stability for Contactless Electroluminescence Green-Emitting LEDs

CsPbX3 (X = Cl, Br or I) perovskite quantum dots (PQDs) have gained increasing interest due to their superior performance in photoelectric applications. In our work, a series of Mn2+ doped CsPbBr3 PQDs were successfully prepared in glasses by melt quenching and in situ crystallization technique. Due to the T-4(1) ((4)G)->(6)A(1) (S-6) transition of Mn2+, a slight red shift from 510 nm to 516 nm was found, with the FWHM expansion from 18 nm to 26 nm. The PQDs@glasses showed excellent thermal stability, and the exciton binding energy reached a high level of 412 meV. The changes of the electronic structure after Mn doping CsPbBr3 can be demonstrated by first principles. Finally, a contactless electroluminescence device with the PQDs@glasses was designed based on the principle of electromagnetic induction, which is a potential application for detecting distance in sterile and dust-free environments.

Automated summary

We successfully prepared a series of Mn2+ doped CsPbBr3 perovskite quantum dots (PQDs) in glasses by melt quenching and in situ crystallization technique. The PQDs exhibited a slight red shift and broadening of emission due to the Mn2+ transition. These PQDs@glasses showed excellent thermal stability and a high exciton binding energy level. By first principles calculations, the changes of electronic structure after Mn doping in CsPbBr3 were demonstrated. Finally, we designed a contactless electroluminescence device with the PQDs@glasses for distance detection in sterile and dust-free environments.