Journal
RADIATION MEASUREMENTS
Volume 42, Issue 4-5, Pages 742-745Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radmeas.2007.02.005
Keywords
synchrotron radiation; time-resolved spectroscopy; self-trapped exciton; luminescence; inner-shell excitation
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Beryllium oxide (BeO) crystals were investigated by time-resolved low temperature VUV-spectroscopy at the SUPERLUMI station and BW3 beam line of HASYLAB (DESY, Hamburg). Photoluminescence spectra (3-10.5 eV), luminescence decay kinetics upon selective photoexcitation, as well as luminescence excitation (50-650 eV) and reflectivity, (9-35 eV) spectra were measured and analyzed for oriented BeO crystals. It was shown that study of oriented crystals makes the traditional time-resolved spectroscopy method essentially more informative. Formation of the self-trapped exciton excited states of different multiplicity was found to sensitively depend on excitation energy and mutual orientation of the crystal's C optical axis and electric vector E of exciting polarized synchrotron radiation. (C) 2007 Elsevier Ltd. All rights reserved.
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