Energy transfer in Bi3+-Sm3+ co-doped phosphors for temperature sensing and imaging

• DOI: 10.1016/j.matdes.2023.112375
• Publication Date: 2023-09-27T16:11:01Z
• Authors: Yu Xue; Yuqi Chen; Qinan Mao; Yang Ding; Gongxun Bai; Liang Chu; Meijiao Liu; Jiasong Zhong
• Keywords: Thermochromism; Repeatability; Emission intensity

Fluorescence thermometry has the distinct superiority of non-invasive, non-contact, and high spatial resolution. However, simultaneous improvement temperature sensitivity resolution remains challenging. Herein, La3Ta0.8Sb0.2O7 matrix was co-doped by Bi3+ Sm3+ with energy transfer for tunable emission color, which further applied fluorescence sensing imaging. With partial substitution Sb5+ Ta5+, peak La3SbO7:0.04Bi3+ shifted from 530 nm to 460 nm, together a 2.1-fold enhancement intensity. The could be bright blue purple under 365 excitation based on transfer. efficiency can reach 41.6% via dipole–dipole interaction. La3Ta0.8Sb0.2O7:(0.04Bi3+,0.005Sm3+) phosphors exhibit maximum relative (Sr) 1.32%K-1 (@498 K) absolute (Sa) 0.059K-1 (@417 K), have excellent repeatability. Thus, in co-coped simultaneously improve sensing. Besides, phosphor/PDMS films obvious thermochromic