Abstract
Electronic process at chemical sensitizer centers in AgBr emulsion grains is studied by luminescence and luminescence-modulation spectroscopy at low temperature. All the sensitizer-induced luminescences are concluded as the radiative decay of bound exciton with a common feature; shallow bound electron in the Coulomb field of trapped hole at the sensitizer center. In addition to the prompt luminescence due to exciton decay, delayed luminescence is expected due to tunnelling recombination of distant-pair of trapped electron and hole, and photoexcitation of such slow-decaying states results in luminescence-modulation. In sulfur sensitization, the trapped electron-hole pair located at distant sulfur-dimer centers is responsible for luminescence-modulation. A new structure model is proposed for sulfur-dimer center and an estimate is made on the concentration of sulfur cluster centers, the dissociation of which is concluded as the main feature of plus-gold effects. Relaxation processes of photoexcited states at low and room temperatures are successfully described in terms of a configuration coordinate diagram. © 1997 Elsevier Science Limited. All rights reserved
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