VUV luminescence of as-grown and electron irradiated corundum single crystals

Marco Kirm; Vachagan Harutunyan; Vladimir Makhov; Sebastian Vielhauer

doi:10.1117/12.639064

12 June 2006 VUV luminescence of as-grown and electron irradiated corundum single crystals

Marco Kirm, Vachagan Harutunyan, Vladimir Makhov, Sebastian Vielhauer

Proceedings Volume 5946, Optical Materials and Applications; 594606 (2006) https://doi.org/10.1117/12.639064
Event: Optical Materials and Applications, 2005, Tartu, Estonia

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.

Citation Download Citation

Marco Kirm, Vachagan Harutunyan, Vladimir Makhov, and Sebastian Vielhauer "VUV luminescence of as-grown and electron irradiated corundum single crystals", Proc. SPIE 5946, Optical Materials and Applications, 594606 (12 June 2006); https://doi.org/10.1117/12.639064

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