Theoretical Investigation of Thermoluminescence in the Presence of Thermally Disconnected Deep Traps

Abstract

Thermoluminescence  (TL) phenomenon is theoretically investigated using two active electron traps and one recombination center. The presence of one and two thermally disconnected deep traps (TDDTs) is taken in to account. The rate equations corresponding to this model are clearly formulated and the results are obtained using MTHEMATICA code. In particular, the variation of concentration of electrons in the active and thermally disconnected deep traps and the TL intensity are generated for various TL kinetic parameters such as activation energy and the frequency factor. The results show that the concentration of electrons in the active electron traps decrease with temperature while that in the TDDTs increase with temperature and approaches a constant. The generated TL glow curve (for E1 = 0.9 eV  and E2 = 1 eV ) has two maxima. However, one broad glow curve with only one maximum is obtained when  E1 and E2 are closer to each other.  The profiles of the TL glow curves and the variation of concentration of electrons in the conduction band are the same except for their intensity.