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The edge of the fundamental absorption band in pure LaCl3 is at about 2250 A. There is no change in the absorption spectrum of pure LaCl3 in the range 2250 to 25 000 A on exposure at room temperature to 107r of gamma rays from a Co60 source. The crystals do not luminesce after such treatment.In contradistinction, LaCl3 containing small amounts of europium exhibits a blue luminescence and thermoluminescence when exposed to ultraviolet or gamma radiation. The luminescent properties are profoundly influenced by long continued gamma irradiation. In addition, color centers are formed which absorb visible radiation.Chemical as well as paramagnetic resonance experiments show that all of these effects are due to the presence in the LaCl3 lattice of dispositive europium. There are at least three different color centers giving rise to three overlapping absorption bands which decay thermally with different rates. The maxima of the absorption bands are at 8000, 6500, and 5500 A. Studies with polarized light show that...

Color Centers and Luminescence in Single Crystals of Lanthanum Trichloride Containing Dipositive Europium