Influence of Thermal and Optical Treatments on the OSL Response of ${\hbox{Al}}_{2}{\hbox{O}}_{3}\!\!:\!\!{\hbox{C}}$ Pellets Using Blue Light Stimulation

This work presents a study of the OSL residual signal of Al
₂
O
₃
:C pellets after different annealing/bleaching treatments. It is shown that this luminescent material has deep trapping centers which are not associated with the TL main peaks and they are not completely emptied with an annealing up to 800
^°
C . This fact was noticed when using blue light for the OSL stimulation. Optical bleaching using high power LEDs (blue, green and white) demonstrated that lower energies (green) result into higher residual OSL signal; and bleaching with similar energy (of that used for stimulation) shows better results.