EFFECT OF SIZE RESTRICTION ON THE STATIC AND DYNAMIC EMISSION BEHAVIOR OF SILVER BROMIDE

The effect of size restriction on the photophysical properties of several different sizes of silver bromide crystallites, prepared either in AOT reverse micelle solutions or as gelatin-stabilized dispersions, is examined. The static and dynamic emission behavior is investigated. The principle effect of size restriction is found to be enhancement of the indirect exciton emission. The iodide bound exciton emission is also found to be vanishingly small or absent in the smallest of the size-restricted crystallites. The lifetime of the indirect exciton emission in the small crystallites is measured and is found to be shorter than that reported for bulk crystals. The temperature dependence of the enhanced indirect exciton is examined, and exciton binding energy is calculated.