Abstract
High-temperature thermoluminescence (TL) measurements from CaF 2 :Er(0.1%) and CaF 2 :Ce for different Ce concentrations are reported. Additionally, Ce- and Er-doped samples at the optimum dopant level (0.1%) are variously codoped with La, Gd, Tl, Bi or Cs through a chemical diffusion process. The presence of another dopant not only alters the TL sensitivity but also the peak positions and the relative intensities of the glow peaks. Overall intensity enhancements depending on the codopant up to 95% within the glow curve, and up to 480% for some individual peaks, are noted. Changes in the detailed structure of the glow curves as a result of codoping reveal that the added ions are attached to the complex containing the trapping centers. The TL mechanism in this material and the role of the additives in light generation are discussed.
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