Abstract
In the recent past, noncontact optical thermometry has flourished as a result of the growing demand for temperature determination. In this work, we presented the first systematic investigation of a novel red phosphor Ca3La2-xW1.984O12: 0.016Mn4+/xDy3+ (CLW: Mn4+/xDy3+). Compared with Dy3+, the emitting intensity of Mn4+ decreases more rapidly with increasing temperature. This property enables CLW: 0.016Mn4+/0.08Dy3+ to be used as a fluorescence intensity ratio thermometer with absolute sensitivity (Sa) of 0.0364 K−1 at 573 K and relative sensitivity (Sr) of 1.551 % K−1 at 473 K. On the other hand, a second temperature sensing model based on the fairly rapid decay of the lifetime is achieved with Sr = 1.953 % K−1 at 523 K and Sa = 0.0034 K−1 at 448 K. The results of this study suggest that phosphor CLW: 0.016Mn4+/0.08Dy3+ could be useful as optical thermometer material with a temperature range of 298K–573K.
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