Speaker
Description
Phototransferred thermoluminescence (PTTL) is the transfer of optically stimulated electrons from deep saturated electron traps to previously emptied shallow electron traps. Conventional thermoluminescence (TL) of CaGa2O4:Pr3+ shows five peaks of which only three are Phototransferred under illumination by blue light (470nm) for TL measured to 500 oC. Pulse annealing analysis shows all PTTL peaks as acceptors of electrons from their successful traps. Analysis of very deep traps reveals only two peaks are acceptors to traps beyond 500oC, one of which is not observed for preheating below this temperature suggesting competition from other traps. No PTTL peak observed for preheating beyond 630 oC suggesting absence of deep traps beyond this temperature. The effect of illumination time is analyzed for each PTTL peak. Control studies without illumination shows no peak reappearance after it is cleared by preheating. These great properties are good for home lighting, dosimetry and light in the dark materials.
