Dresden 2006 – scientific programme
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DF: Dielektrische Festkörper
DF 8: Spectroscopy, Scanning and Diffraction Methods
DF 8.2: Talk
Wednesday, March 29, 2006, 15:10–15:30, M{\"U}L Elch
Luminescent spectroscopy of the RE ions incorporated in the lead tungstate crystals — •Oksana Chukova1, Sergiy Nedilko1, and Marian Pashkovskyi2 — 1Physics Faculty, Kyiv National Taras Shevchenko University 2, block 1, acad. Hlushkov Ave., 03680, Kyiv, Ukraine — 2Physics Faculty, Lviv National Ivan Franko University, Lviv, Ukraine
The lead tungstate PbWO4 (PWO) crystals are widely doped by various impurities, especially rare earth (RE) ions, in order to change characteristics of these crystals, e.g., significantly improve transmission and radiation hardness of the crystal. Spectral properties of the RE doped PWO crystals were studied formerly, but the investigations were directed mainly on spectroscopy of proper matrix emission of the pure and doped crystals. The present paper is concentrated on investigation of spectroscopy of RE ions in the PWO crystal matrix. Spectral properties of the Pr3+ and Eu3+ ions doped into the PWO crystal were studied at photo and synchrotron radiation excitation and analyzed on parameters of Stark splitting in the crystal field. Formation of at least two types of emission centers based on the RE ions in the PWO crystal lattice is shown and origin, structure and spectroscopy of these centers are investigated. Different site symmetry and oxygen coordination influence in different ways on probabilities of emission and excitation transitions as well as on shifts of lines and weight centers of manifolds for the both types of centers. Experiments with synchrotron excitation were performed at SUPERLUMI Station at HASYLAB, DESY, Hamburg.