PVT scintillators with very-high fluorescent dye concentrations

A concentration study of the fluorescent dye pyrene in bulk PVT-based scintillator is the subject of this investigation. Pyrene is known to form an excimer at elevated concentration, with fluorescence properties quite distinctive from that of individual pyrene molecules. The fluorescence excitation, emission, decay time, and scintillation efficiency have been studied over an extensive concentration range, from 5 g/l to 225 g/l. We observe a significant decrease in fluorescence decay time and an increase in fluorescence efficiency with increasing pyrene concentration. At highest concentration, a light yield of 84% of EJ-201T is obtained.