Kinetics of thermally stimulated luminescence from alkaline earth borates

The kinetics of thermally stimulated emission (TSL) from XB2O4 (X= Ca, Sr, Ba) has been investigated employing both isothermal decay and peak shape analysis methods. For BaB2O4 the emission was observed to lie in the visible region and the kinetics of TSL emission could be determined without any ambiguity. However, the emission spectra of CaB2O4 and SrB2O4 were found to consist of two broad emissions: one in the UV and the other in the blue green regions. Consequent to the presence of two emission bands, the determination of TSL kinetics required collection of TSL data for the two components of emission separately. Otherwise, an unambiguous determination of the TSL kinetics just could not be possible. The kinetics of TSL emission for the three borates is found to be of second order.