Study on energy transfer and temperature sensing properties of Pb²⁺/Sm³⁺ co-doped Ba₂MgY₂(BO₃)₄

Researches on fluorescence intensity ratio (FIR) based temperature sensors have become more and more popular in recent years. Herein, we co-doped Pb2+ and Sm3+ into the host material Ba2MgY2(BO3)4 (BMYB) to prepare a new series of phosphors. The Pb2+ activated phosphor BMYB:0.03 Pb2+ presents a wide blue emission band centered at 416 nm under 278 nm laser excitation with internal quantum efficiency of 46%. In the presence of both Pb2+ and Sm3+, energy transfer will occur between them, resulting in tunable color emission. Besides, the phosphor has an absolute sensitivity of 0.96% K-1 at 575 K, which makes it an excellent candidate for temperature sensing. These findings suggest that prepared phosphor is a potential candidate for color tunable phosphor and temperature sensing material.