IngentaConnect Dependence of quasi-equilibrium on heating rate and its use in th...

Authors: Sunta C.M.¹; Ayta W.E.F.; Chubaci J.F.D.; Watanabe S.

Source: Journal of Physics D: Applied Physics, Volume 34, Number 22, 2001 , pp. 3285-3295(11)

Publisher: Institute of Physics Publishing

Abstract:

Using the simulated thermoluminescence (TL) glow peaks, it is shown that the level of quasi-equilibrium (QE) during the emission of a glow peak depends on the heating rate () used. Any system which may satisfy the QE condition when is below a certain value during TL stimulation, may turn to the non-QE condition at higher values of . The level of QE is examined in terms of the two functions called D(T) and q(T). A quantitative limit is suggested on the value of these functions in order to define a system as quasi-equilibrated. At about the turning point of the QE to non-QE condition the glow peaks begin to change their shape. This property is found for the first time and is used as the first ever experimental method to test whether or not the emission of a given glow peak is occurring under the QE condition. Further, at the QE to non-QE turning point the ratio T_R/_m appears to be nearly constant with only a weak dependence on the values of _m where T_R is the recording time of the glow peak and _m is the recombination lifetime of the free carriers during the peak emission. This near constant value of T_R/_mtogether with the measured value of T_R may be used to estimate the _m of the systems which show the non-QE condition above a certain heating rate. The value of _m being a function of the concentration and the cross section of the TL related traps, one is able to correlate the value of _m thus found with the approximate range of these parameters for the given sample. The results are discussed in the perspective of a well known TL phosphor and the plausible range of its concentration and cross section parameters.

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Dependence of quasi-equilibrium on heating rate and its use in the study of thermoluminescent materials