Optical absorption, photoluminescence, and thermoluminescence emission studies are made on CsCI:Tb3' crystals at room temperature. The presence of impurities is confirmed by the characteristic OA band at 360 nm. Photoluminescence of these crystals shows characteristic Tb3+ emissions due to transitions from the 5D3 and 5D4 levels to various levels of the 'F septet. The glow curve studies clearly show the participation of terbium ions in the thennoluminescence process. The new 415 K glow peak, not observed in pure CsCl, is ascribed to the terbium ion in the vicinity of F centers. All the TL glow peaks give the characteristic emissions of Th'+ in addition to the emission due to the recombination of the F electron with V-type centers.
Thermoluminescence (n), o p t i d absorption and n emission shldies are made on CsCLC2" crystals at mom tempera-. The glow c w e and optical absorption shldies clearly show the participation of chromium ions in then process. A new high-temperature 483 K glow peak not observed in pure CsCl is ascribed to the chromium impurity This n glow peak gives the characteristic emission of C?+ at 730 nm.
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