Nanocrystalline structure control and tunable luminescence mechanism of Eu-doped CsPbBr3 quantum dot glass for WLEDs
CsPbX3(Cl, Br, I) perovskite quantum dot glass has been widely reported, and the discovery of next-generation perovskite luminescent materials has been challenged by doping rare earth activators with energy-level transitions. In this work, we report a novel Eu-doped quantum dot glass material with tunable luminescence properties. The structure characteristics and tunable luminescence mechanism were investigated by combining X-ray diffraction, X-ray photoelectric spectroscopy, excitation and emission spectra. It was found that Eu ions replaced the lattice of Pb in CsPbBr3 quantum dots and formed CsEuBr3 quantum dots, which resulted in a blue emission. Meanwhile, a green emission from CsPbBr3 quantum dots and a red emission originally from Eu3+ in the glass matrix can also be observed by controlling the heat treatment temperature. A light-emitting diode is designed based on the prepared Eu-doped quantum dot glass without doping any phosphors, and a warm light with CCT at 4075 K is obtained. The present work provides a new luminescence tunable design principle for europium-doped quantum dot glass materials and could inspire the future exploration of rare earth ion-doped quantum dot glass materials.