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The temperature dependence of the steady-state fluorescence spectrum ofanthracene crystals range from 300K to 500K had been investigated, which was inthe temperature range of most tabletop laser-driven shock wave experiments. Theinteresting finding is that the fluorescence intensity of the 2-0 transitionincreases more rapidly than other transitions with the rising temperature. Inparticular, the transition intensity ratios {\gamma}n all shows a perfectexponential increasing curve, which can be used for fluorescence temperaturesensing. The analysis of sensitivity {\eta} and random uncertainty {\Delta}Thas demonstrated that the intensity ratio {\gamma}2 is the best comprehensiveperformance physical quantity for temperature sensing. The theoretical analysisand experimental results demonstrated that unusual intensity increasing of 2-0transition was originated from the second excited triplet state T2, which wasthermally coupled with the first excited singlet sate S1. In a word, weestablished a new fluorescence temperature sensing method based on theintensity ratio and clarified the mechanism of this method was the thermallyactivated singlet-triplet intersystem crossing.

Fluorescence temperature sensing based on thermally activated singlet-triplet intersystem crossing in crystalline anthracene