Sn2+/Mn2+ codoped strontium phosphate (Sr2P2O7) phosphor for high temperature optical thermometry

Add time:09/25/2019    Source:sciencedirect.com

In this work, a new type of luminescent temperature sensor based on the Sn2+→Mn2+ resonance energy transfer is designed, which shows great potential in high temperature optical thermometry. Using the micro-sized Sn2+/Mn2+:α-Sr2P2O7 phosphor fabricated by carbon reduction method as optical thermometer, the sensitivity in the temperature range of 423 K–623 K is well superior to that for the other micro/nano luminescent temperature sensing materials reported previously, and the maximal absolute sensitivity reaches as high as 0.027 K−1 at 623 K. Analyses of the temperature-dependent photoluminescence spectra and configurational coordinate diagrams for Sn2+:α-Sr2P2O7 and Mn2+:α-Sr2P2O7 indicate that the temperature-sensitive variation in fluorescence intensity ratio of Sn2+ to Mn2+ is originated from the difference in thermal quenching activation energy for 3PJ (J = 0,1) levels of Sn2+ (4053 cm−1) and 4T1 level of Mn2+ (2464 cm−1). These results may provide useful inspiration for building highly sensitive self-referencing optical thermometers based on energy transfer induced sensitized luminescence.

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