Enhanced the luminescent performance of CsPbI3 quantum dot-embedded borosilicate glass by controlling crystallization using Dy3+ ions as nucleating agent for remote color-tunable LEDs

Different concentrations of Dy ³⁺ and perovskite quantum dots (PQDs) were simultaneously embedded in the B-Si-Zn glasses by melt-quenching and heat-treatment subsequently. A battery of experimental results including TEM, distribution of different elements, and photoluminescence prove that partial Dy ions are successfully doped into CsPbI ₃ and played different roles depending on the doping concentration. When the Dy ³⁺ concentration is circa 0.1mol%, Dy ³⁺ as a nucleation agent reduces the energy required for the precipitation and growth of perovskite quantum dots, obtaining outstanding quantum efficiency of 31.82%. The excess Dy ³⁺ supplement will prevent the mobility of PQDs elements. Based on the as-made glass sample, the remote fluorescent films have been successfully prepared. A kind of prototype lighting device was assembled, which demonstrated a high color rendering index of 96.5 under the current of 20 mA. Interestingly, by adjusting the concentration of Dy ³⁺, color regulation can be achieved from orange-red light to yellow-white light.