Cs(Pb,Mn)Br 3 Quantum Dots Glasses with Superior Thermal Stability for Contactless Electroluminescence Green-Emitting LEDs.

CsPbX ₃ (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 Mn ²⁺ doped CsPbBr ₃ PQDs were successfully prepared in glasses by melt quenching and in situ crystallization technique. Due to the ⁴ T ₁ ( ⁴ G)→ ⁶ A ₁ ( ⁶ S) transition of Mn ²⁺ , 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 CsPbBr ₃ 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.