A highly sensitive blue-LED-excitable self-calibrated luminescent thermometer based on Cr3+/Eu3+ Co-doped Al2W3O12

In this work, Al 2 W 3 O 12 :1%Cr 3+ ,2%Eu 3+ with two discriminable dual emissive centers is synthesized. Both Eu 3+ and Cr 3+ ions can be excited efficiently by 465 nm. Photoluminescence excitation (PLE) spectra and photoluminescence (PL) lifetime indicate that there is no energy transfer (ET) between Eu 3+ and Cr 3+ ions. It is worth noting that the photothermal stability of Eu 3+ ions is much better than that of Cr 3+ ions. Specifically, the ratio of I Cr /I Eu decreases linearly with increasing temperature. Therefore, a blue-LED-excitable luminescent thermometer based on Cr 3+ /Eu 3+ co-doped Al 2 W 3 O 12 is proposed. This developed self-calibrated luminescent temperature sensor possesses the relatively high absolute and relative sensitivity (0.38 K -1 and 2.9% K −1 respectively) as well as good cycle stability among the previously reported TM/Ln-based luminescent; thermometers. These superior features of the developed self-calibrated luminescent thermometer (SCLT) make it a very promising candidate for temperature sensing applications.