LuAG:Pr, LuAG:Pr,Mo and LuYAG:Pr relative light yield measured at wide temperature range with MPPC readout

Evaluation of Li2SnO3:Cr3+, Mn4+ as a dual-emitter luminescence sensor for cryogenic temperatures

“…7. Subsequently, it undergoes a gradual decline, disappearing above 500 K. This type of temperature dependence, referred to as negative thermal quenching, has been observed in the luminescence of some materials, 32,33 including phosphors doped with TM ions. 34 The phenomenon is explained by considering two main processes that govern the population of the emitting state (i) thermally activated population of the emitting centres that lead to an increase of the luminescence and (ii) the quenching of the emission intensity due to the non-radiative decay of emission centres.…”

Growth, structure, and temperature dependent emission processes in emerging metal hexachloride scintillators Cs2HfCl6 and Cs2ZrCl6

“…This type of temperature dependence termed as a "negative thermal quenching" has been observed before in some materials 37 including scintillators. 38,39 Assuming thermally acti-vated crossover as the main mechanism that controls the population of involved states, this behavior can be explained by the thermal activation of intermediate trap states that leads to the enhancement of the emission intensity with increasing temperature. This can occur before the onset of non-radiative thermal quenching that causes a gradual decrease of emission intensity or during such quenching.…”