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|Title:||Radiation effect on the luminescence of LiYF4 : Er3+|
|Publisher:||ELSEVIER SCIENCE BV|
|Citation:||NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 134(3-4), 385-392|
|Abstract:||Luminescence and also the effects of ionising radiation on luminescence have been investigated in LiYF4:Er. The defects created by ionising radiation are studied by means of Thermally Stimulated Luminescence (TSL) and Electron Spin Resonance (ESR). TSL studies indicate a prominent glow peak at 386-412 K, whose position is found to depend on the radiation dose. Two defect centres, tentatively assigned to F-centres, are observed at room temperature. Step annealing measurements suggest a connection between these centres and the TSL glow peak. Photoluminescence studies indicate considerable reduction in emission intensity which appears to arise from the distortion of the lattice around the Er3+ ion caused by the defect centres. An explanation of the observations is suggested on the basis of impurity ion-defect centre formation. (C) 1998|
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