Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

DF: Dielektrische Festkörper

DF 8: Spectroscopy, Scanning and Diffraction Methods

DF 8.2: Vortrag

Mittwoch, 29. März 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.