Sm3+‐based single‐band ratiometric thermometer with tunable sensitivity

Abstract Rational design of single‐band ratiometric (SBR) thermometers has gained considerable attention over the past 5 years. However, the intensity of the excited state absorption mechanism, which is often involved in SBR thermometry, is not such unsatisfactory. Here, we provide a novel SBR temperature measurement method, depending on Sm 3+ ‐doped calcium tungstate. It has been demonstrated that the charge‐transfer‐ and ground‐state absorption mechanisms have the totally opposite responses to the change of temperature. Relying on these two excitation mechanisms, a sensitive SBR thermometry is proposed. In addition, its relative sensitivity could be modulated flexibly by just adjusting excitation modes. The maximum relative sensitivity is as high as 1.98% per K at 318 K. Our results are expected to provide a reference for more researchers to design optical thermometers.