Abstract
Under 980 nm excitation, upconversion emissions originating from and transitions of ion in single crystal were studied as a function of temperature in the range of 323–773 K. The and levels of ion are confirmed to be thermally coupled levels. By using fluorescence intensity ratio technique, the sensitivity of optical temperature sensor achieved in our work is higher than other reported temperature sensors. Additionally, this optical temperature sensor is well suited to high operating temperature. codoped is a promising candidate for fabricating excellent optical temperature sensors.
© 2014 Optical Society of America
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