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Localized excitons and defects in PbWO 4 single crystals: a luminescence and photo‐thermally stimulated disintegration study
Author(s) -
Krasnikov A.,
Nikl M.,
Zazubovich S.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200690014
Subject(s) - luminescence , exciton , photoluminescence , spectroscopy , scintillation , materials science , physics , chemistry , optics , condensed matter physics , optoelectronics , quantum mechanics , detector
The cover picture refers to the article by Aleksei Krasnikov et al., that was selected as Editor's Choice [1]. It depicts a fragment of a lead tungstate (PbWO 4 ) crystal lattice structure and illustrates the complex anion (WO 4 ) 2– tetrahedra bonded to the Pb 2+ cation. Perturbation of the (WO 4 ) 2– tetrahedra by defects nearby results in exciton localization near the defects and a slightly different emission spectrum, which is shown in the diagram. Localized excitons are evidenced for the first time in the PbWO 4 structure. Under selective irradiation of PbWO 4 crystals in the ultraviolet spectral region, the decay of various localized excitons into stable defects takes place, which can be detected by a sensitive thermally stimulated luminescence method. Aleksei Krasnikov is a PhD student at the University of Tartu, Estonia. Martin Nikl holds a position as a senior scientist and head of the Laboratory of Luminescence and Scintillation Materials at the Institute of Physics of the Czech Academy of Sciences. Svetlana Zazubovich is a senior scientist at the Institute of Physics, University of Tartu. The research groups of Martin Nikl and Svetlana Zazubovich have been collaborating closely for the last 15 years mainly in the field of optical spectroscopy of wide band‐gap scintillation materials.