OPTICAL-ABSORPTION, PHOTOLUMINESCENCE, AND THERMALLY STIMULATED LUMINESCENCE OF CSCL-TB CRYSTALS

Optical absorption, photoluminescence, and thermoluminescence emission studies are made on CsCl:Tb3+ crystals at room temperature. The prese nce of impurities confirmed by the characteristic OA band at 360 nm. P hotoluminescence of these crystals shows characteristic Tb3+ emissions due to transitions from the D-5(3) and D-5(4) levels to various level s of the F-7 septet. The glow curve studies clearly show the participa tion of terbium ions in the thermoluminescence process. The new 415 K glow peak, not observed in pure CsCl, is ascribed to the terbium ion i n the vicinity of F centers. All the TL glow peaks give the characteri stic emissions of Tb3+ in addition to the emission due to the recombin ation of the F electron with V-type centers.