EFFECT OF PHOTOINDUCED DEFECT SITES ON THE PHOTOLUMINESCENCE OF SODIUM CRYPTAND SODIDE

We have measured time-resolved photoluminescence at low temperature fr om sodium cyrptand sodide crystals which were preirradiated by intense dye laser pulses. The line shape consists of two components, one of w hich exists only with preirradiated crystals and has different time de cay from the other. The time evolution of the spectrally integrated in tensity of each component is approximately monoexponential. The two pe aks redshift with increasing time, which indicates that both arise fro m exciton-polariton states.