Thermoluminescence of Sr1-xEuxF2+x solid electrolytes

Thermoluminescence (TL) studies have been carried out in different compositions of Sr1-xCuxF2+x mixed crystals as a function of X-irradiation time. Three groups of TL glow peaks in the temperature ranges (340, 360∝370 K), 460∝475, 540∝575 K) and (615∝635, 680∝720 K) are identified. The growth rates of different glow peaks have been compared with each other to estimate the growth kinetics. The three groups of TL glow peaks are attributed to thermal ionization of radiative impurity centers, different stages of F-centers and other kinds of defect centers such as F-interstitials. The shift in the glow peak maxima is perhaps due to unassociated impurities surrounding F-centers causing a change in configuration. The concentration quenching of TL output due to increased europium is pertinent in Sr1-xEuxF2+x mixed system. (orig.)