Negative and positive thermal expansion effects regulate the upconversion and near-infrared downshift luminescence for multiparametric temperature sensing

Visualized real-time flexible high-temperature sensing in Eu3+/Tb3+-doped Y2Mo3O12 negative thermal expansion material films

“…The NTE Yb 2 W 3 O 12 :Er phosphor and positive thermal expansion CaWO 4 :Yb/Er phosphor are combined as a new non-contact FIR temperature sensing, achieving maximum relative sensitivities ( S r ) of 2.04% K −1 , 2.15% K −1 , 2.01% K −1 , and 2.09% K −1 in infrared red FIR ( I 860 / I 525 , I 860 / I 675 , I 1550 / I 525 , I 1550 / I 675 ). 36 Due to the energy transfer between rare earth ions and the charge-transfer band (CTB) of NTE materials, thermal enhancement can also occur. Mao et al investigated the energy transfer between Sc 2 Mo 3 O 12 NTE materials and Eu 3+ ions and achieved absolute emission intensities of Sc 2 Mo 3 O 12 :20%Eu 3+ at 398 and 798 K, reaching 292% and 97% of the initial intensity of 298 K in 2022, respectively.…”