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

Abstract

Different concentrations of Dy3+ 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 CsPbI3 and played different roles depending on the doping concentration. When the Dy3+ concentration is circa 0.1mol%, Dy3+ 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 Dy3+ 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 Dy3+, color regulation can be achieved from orange-red light to yellow-white light.