Sm <sup>3+</sup> ‐based single‐band ratiometric thermometer with tunable sensitivity
Yuanbo Yang, Panlai Li, Zixuan Zhang, Zhijun Wang, Hao Suo, Leipeng Li
Abstract
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.