ANALYSIS OF THE OPTICAL BEHAVIOR OF EU2+ IONS IN CSCL CRYSTALS

In this work the fluorescence spectrum of Eu2+ doped CsCl single cryst als has been systematically investigated for different annealing treat ments. The quenched samples present an emission band peaking at 22700 cm(-1) due to Eu-vacancy complexes and two additional emissions at 220 40 and 20524 cm(-1). which ale related to small europium aggregates. T hermal annealing of the samples induces the formation of Eu precipitat es with a platelet-like structure along {220} crystal planes, giving r ise to an emission band at 23120 cm(-1). A first result of an Eu2+ ind uced aggregation by ultraviolet laser irradiation is presented.