The thermoluminescence (TL) of heated amorphous ZrO2, doped by Ti, Th, U, Nb, Dy, excited by 253.7 nm or X‐radiation is investigated. Six main peaks are observed at 100, 135, 190, 245, 285, and 385 K and their activation energies determined by four methods. It is shown that most traps obey Curie's model, and that the tetragonal form, which coexists with the monoclinic form, is related to the 245 K peak. The analysis of various TL emission spectra indicates that the emission centres are localized and are connected with Ti3+ surrounded by six oxygens. A centre model is discussed in terms of configuration coordinate curves.

A theoretical model which takes into account thermally stimulated luminescence (TSL), conductivity (TSC) and exoelectronic emission (TSEE) is proposed in this article. The model is established for the case of a single type of electron trap, a single type of recombination centre and in the presence of thermally disconnected traps. It generalizes the model of Lewandowski and McKeever by taking the TSEE phenomenon into consideration. TSEE is described as resulting from the thermionic effect and so the model applies only to a thin solid film about 10 nm thick. As an application example, the influence of various parameters involved in the model on peak shape and position is investigated.

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Data concerning thermostimulated luminescence (TL) and fluorescence spectra are given for a scries of ruby monocrystals obtained by Verneuil's method, and containing several values of Cr3+concentration, up to 12000 ppm.

a-Al 2 O 3 crystals were treated in different atmospheres (reducing/oxidising) at high temperature and their optical, positron-annihilation and thermoluminescent (TL) properties were investigated. From optical absorption and positron-annihilation spectra we concluded that aluminium-vacancies were created while oxygen-vacancies were destroyed in oxidised samples indicating a Schottkytype disorder. Structural changes were correlated with TL glow curves and the origin of some TL peaks was explained.