The light emission from scintillators which are liquid at room temperature was studied in the interval between +20 C and 120 C, where the phase transition from liquid to solid takes place. The light yield measured at 120 C is about twice as much a s that observed at +20 C. By cooling the scintillator from +20 C t o 120 C and then heating it from 120 C to +20 C, the light yield varies in steps at well de ned temperatures, which are di erent for the cooling and heating processes. These hysteresis phenomena appear to be related to the solvent rather than to the dopant. The decay time of scintillation light w as measured at +20 C and 120 C. Whilst at room temperature most of the light is emitted with a decay time of 6{8 ns, at 120 C a slower component, with a decay time of 25{35 ns, becomes important.