LUMINESCENCE OF CE3-EARTH CHLORIDE LATTICES( IN ALKALINE)

The luminescence properties of cerium in alkaline earth (Ca, Sr, Ba) c hlorides have been studied. Cerium emits in these matrices in the UV-r egion (330-400 nm) and the excitation bands locate at 220-330 nm. The emission shows a slight shift to shorter wavelengths when the host cat ion changes from calcium to strontium and barium although these simple trends are difficult to see because SrCl2:Ce has several sites for th e emitting ion. The addition of alkali ions (Na or K) for charge compe nsation enhances the luminescence but has only a minor effect on the w avelengths. Concentration quenching does not take place for Ce concent rations less than 5-10 mol%.