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Optical thermometry based on the up-conversion intensity ratio of thermally coupled levels of rare earth ions has been widely studied to achieve an inaccessible temperature measurement in submicron scale. In this work, a novel optical temperature sensing strategy based on the energy transfer from charge transfer bands of W-O and Eu-O to Eu 3+ -Dy 3+  ions is proposed. A series of Eu 3+ /Dy 3+  co-doped SrWO 4  is synthesized by the conventional high-temperature solid-state method. It is found that the emission spectra, emission intensity ratio of Dy 3+  (572 nm) and Eu 3+  (615 nm), fluorescence color, lifetime decay curves of Dy 3+  (572 nm) and Eu 3+  (615 nm), and relative and absolute sensitivities of Eu 3+ /Dy 3+  co-doped SrWO 4  are temperature dependent under the 266 nm excitation in the temperature range from 11 K to 529 K. The emission intensity ratio of Dy 3+  (572 nm) and Eu 3+  (615 nm) ions exhibits exponentially relation to the temperature due to the different energy transfer from the charge transfer bands of W-O and Eu-O to Dy 3+  and Eu 3+  ions. In this host, the maximum relative sensitivity S r  can be reached at 1.71% K −1 , being higher than those previously reported material. It opens a new route to obtain optical thermometry with high sensitivity through using down-conversion fluorescence under ultraviolet excitation.

A novel optical thermometry based on the energy transfer from charge transfer band to Eu3+-Dy3+ ions