On the slow component of luminescence stimulated from quartz by pulsed blue light-emitting diodes

Characteristics of luminescence lifetimes and luminescence intensity from quartz have been studied as a function of temperature at long stimulation times (the 'slow component' region). In this region, luminescence lifetime values are strongly affected by temperature especially from 373 to 473 K. Luminescence intensity values increase from 293 to 398 K and then decrease until 473 K, the maximum temperature investigated. These changes are independent of the order in which the measurements are made and have been discussed in terms of thermal assistance and thermal quenching of the luminescence. Activation energies for thermal assistance and thermal quenching evaluated from temperature-dependent changes of both luminescence intensity and luminescence lifetimes are given