Depth of electron traps in silver halides by the thermoluminescence spectra method

The thermoluminescent emissions of AgCl and AgBr crystals have been investigated as excited at liquid N₂ temperature with UV light. The spectra of both halides were found to exhibit a single glow peak, with maxima at 140 and 124 ° K respectively. Analysis of the data yields an activation energy of 0.13 eV for AgCl and 0.096 for AgBr. The trapping centres are identified with Frenkel defects and evidence is obtained in favour of the carrier trap situation presupposed by the Mitchell and Mott model for the latent photographic image formation.