Luminescence Characteristics of Cdi2 Crystals Activated by Europium

The influence of different europium concentrations on emission processes in CdI2 crystals were investigated.It was found that the europium admixture increase from 0,05 mol.% up to 1 mol.% in CdI2 crystals causes theluminescence excitation intensity decrease in the fundamental absorption region and does not have any influenceon emission spectra. At excitation in the activator absorption region the luminescence was strongly extinquished.The analysis of experimental data show that photoluminescence of CdI2:Eu crystals is connected with self and admixture defects, that form the associates. The radiation takes place between the levels, related with crystal lattice defects with include inter-zonal and un-localized activator excitations. Photo-stimulated luminescence in CdI2:Eu is realized in electronic phase of recombination process and is caused by recombination of electrons freed from Fcentres with holes, which are localized near the activator. At the base of CdI2:Eu crystals it is possible to create the registration detectors for X-ray, ultraviolet and visible bands of spectra of electromagnetic emission