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Non-contact optical thermometry using rare-earth materials has attracted a lot of attention due to its realization of non-invasive and real-time temperature determination. In the current work, a new mechanism, differing from the conventional approach utilizing the ratio of intensities emitted from two thermally coupled excited levels, was developed and demonstrated for temperature sensing using Eu3+-doped Ca3Sc2Si3O12 (CSSO). Under the excitation of 610.6 nm-wavelength light, Eu3+ ions at the 7F2 multiplet became excited to the 5D0 state, and then the luminescence intensity originating from the 5D0 state increased significantly as the temperature was increased from 123 K to 273 K. The thermoequilibrium of the 7F2 multiplet with the 7F0 ground state at a weak excitation ensured a steady increase of the luminescence intensity I with temperature T, which well fit the equation I = Aexp(−B/T) for the transitions to both 7F1 and 7F4 multiplets. A relative sensitivity SR of 1008/T2 was obtained for the 7F1 case, with a value of 1.35% at 273 K. This scheme, as a result of detecting the blue-shifted emission, has the advantages of being less disturbed by stray light from the host and the object of the thermometry. In addition, the high quantum efficiency of a one-photon excited photoluminescence scheme has the advantage of improving the resolution of the thermometry. Furthermore, a near-infrared broadband emission observed in the sample can be adopted as a reference, so as to transform the scheme into one using a luminescence intensity ratio. These results indicated that CSSO:Eu3+ may be used in practical temperature sensing applications.

rsc advances

Optical thermometry based on thermal population of low-lying levels of Eu3+ in Ca2.94Eu0.04Sc2Si3O12