Multicolor luminescence of Eu3+/Tm3+ co-doped CsPbBr3 quantum dots phosphate glass by mechanical crystallization

Obtaining multicolor luminescence in cesium lead bromide quantum dots (QDs) glass with doping rare earth ions often relies on the thermal treatment method, which requires precise control of the preparation conditions and environment. In this study, the Eu3+/Tm3+ co-doped CsPbBr3 QDs phosphate glass with multicolor luminescent performance is prepared, via high-temperature melting method followed by mechanical crystallization method. Firstly, when the glass suffers from continuous external force, making glass network structure destroyed and looser, which advances the migration of Cs+, Pb2+, and Br- ions. Subsequently, these ions absorb fracture energy and rearrange to generate QDs on the sample surface. In addition, under ultraviolet (UV) excitation, the luminous centers of Eu3+, Tm3+ and QDs correspond to red, blue and green light, respectively. By varying the grinding time (0 min to 10 mins), the prepared glass emits colors from purple-light to green-light. And through doping different concentrations of Eu3+ and Tm3+ ions or changing UV excitation wavelength, the QDs glass with blue-green-red multicolor luminescence is obtained after grinding for 1 min. The preparation of CsPbBr3 QDs glass with doping Eu3+ and Tm3+ by mechanical crystallization is not only easy and energy conservation, but also exhibits multicolor luminescence from blue-light to red-light. It provides an effective method for fabricating multicolor luminescent glass materials.