If you say the excitation intensities are temperature dependent then you can use them for optical temperature sensing. For that you need to create a calibration curve of fluorescence intensity vs temperature. But need to be careful because intensity measurements are always tricky. There are problems due to scattering and inner filter effects for solid powder samples.

Also one needs to check if the temperature dependence is strong or weak. If the temperature dependence is weak then it may not be useful always. If the temperature dependence if strong then the problems are less.

You also will need to keep in mind the variations in fluorescence intensity at a given temperature due to different sample preparations.

Other parameter you could consider seriously is fluorescence lifetime.