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Proceedings Paper

VUV luminescence of as-grown and electron irradiated corundum single crystals
Author(s): Marco Kirm; Vachagan Harutunyan; Vladimir Makhov; Sebastian Vielhauer
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Paper Abstract

The optical properties of as-grown and electron-irradiated α-Al203 (corundum) single crystals were investigated at low temperatures, using vacuum-W (VUV) time-resolved luminescence spectroscopy under the synchrotron radiation excitation. It has been shown that in the electron-irradiated crystals the excitation of self-shrunk exciton emission extends to the region of interband transitions. The decay time of the 7.6-eV emission of the self-shrunk excitons in as-grown crystals was found to be about 7 and 23.8 ns respectively for the excitations in the excitonic band and at energies at which several electron-hole pairs are generated. In the irradiated crystals, these lifetimes were by about 2 ns longer than in the as-grown ones. For both crystal states, the nature and dynamics of the electronic excitations are discussed.

Paper Details

Date Published: 12 June 2006
PDF: 6 pages
Proc. SPIE 5946, Optical Materials and Applications, 594606 (12 June 2006); doi: 10.1117/12.639064
Show Author Affiliations
Marco Kirm, Univ. of Tartu (Estonia)
Vachagan Harutunyan, Yerevan Physics Institute (Armenia)
Vladimir Makhov, P.N. Lebedev Physical Institute (Russia)
Sebastian Vielhauer, Univ. Hamburg (Germany)

Published in SPIE Proceedings Vol. 5946:
Optical Materials and Applications
Arnold Rosental, Editor(s)

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