Temperature-dependent color-tunable luminescence in CsPbBr3: Dy3+ glass ceramic

Available tunability of energy up-conversion in rare-earth (RE) ion doped nanomaterials has drawn great attention recently in the field of high-sensitive optical temperature transducer, but the intrinsically sharp fluorescence thermal-quenching and low energy transfer efficiency certainly limit further development. In this work, CsPbBr3 perovskite quantum dots (PQDs) was prepared by the melt-quenching method, simultaneously doping with Dy3+ in borosilicate glass, aiming to explore the thermochromic property. The novel phenomenon herein is that emerged bimodal emissions come from a luminescent active center of CsPbBr3 and a temperature-passivated RE Dy3+ ion, synergistically contributed to the remarkable relative sensitivities (2.631% K - 1). Interestingly, temperature-depended polychromatic luminescence among the PQDs embedded glass has been fully demonstrated as pumped by 365 nm ultraviolet light. Precise control of luminescent centers and color gamut is expected to design a temperature-sensitive material based on PQDs for promising optical applications.