Abstract

We study the variation law of relative sensitivity in the field of fluorescence intensity ratio thermometry. It is theoretically demonstrated that there must be only one maximum value of relative sensitivity in the case in which there is a positive offset in fitting function. Moreover, the method to obtain this maximum is proposed. Experimental results, taking the ${}^5{\mathrm{D}}_1/{{}^5\mathrm{D}}_0$ levels of ${\mathrm{Eu}}^{3+}$ as examples, are in excellent accordance with the conclusion. The mechanism behind is then investigated, and other populating processes imposed on the ${}^5{\mathrm{D}}_1$ level, which exert negative outcome on thermal sensitivity, are found to play a key role in determination of this unique variation law.

© 2018 Optical Society of America

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