Fluorescence thermometers using intramolecular exciplexes.

Exciplex-based fluorescence thermometers have been developed which should allow the nonintrusive realtime determination of temperatures in hydrocarbon liquids within 1 degrees C at temperatures as high as 400 degrees C. The two-candidate dopant molecules-1,3-bis-(1'-pyrenyl)-propane and 3-(4'-dimethylaminophenyl)-1-(1'- pyrenyl)-propane-are commercially available and may be used at concentrations as low as 1 ppm.