Abstract
AbstractOptical absorption, photoluminescence, photostimulated luminescence (PSL) and thermoluminescence (TL) studies on RbBr:Tb3+ crystals irradiated with X‐rays is reported. The optical absorption in the UV region confirms the presence of terbium in the host matrix in the trivalent state. Photoluminescence of these crystals exhibits characteristic Tb3+ emissions due to transitions from the 5D3 and 5D4 levels to various levels of the 7F septet. On F‐bleaching X‐irradiated crystals Z3 centers are observed. The TL glow curve indicates a two‐step thermal annihilation process for the radiatively created defects. The presence of the characteristic emissions due to terbium ions in the photostimulation at the F band confirms the participation of Tb ions in the defect‐production process. Trap parameters for the TL process are calculated and presented. Emissions under the TL glow peaks contain the characteristic emissions of Tb3+ in addition to the emission due to the recombination of the F electron with V‐type centers. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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