Abstract
The luminescence excitation spectra of corundum single crystals irradiated with 50 MeV electrons were studied. In the region of fundamental absorption there appeared excitation bands (blue and ultraviolet) which correlated well with optical absorption bands of the F{sup +}-centre in the absorption (reflection) spectra. The excitonic peaks observed in the excitation spectra of red luminescence were explained by the charge energy transfer by Cr{sup 2+}, Cr{sup 4+} ions at excitonic excitation. At {Dirac_h}{nu} > 9.5 eV there appeared sharp drops which were interpreted as nonirradiative near-surface recombinations. 8 refs.; 3 figs.
Citation Formats
Harutunyan, V V, Gevorkyan, V A, and Grigoryan, N E.
Vacuum ultraviolet luminescence excitation spectra of {alpha}-Al{sub 2}O{sub 3} single crystals.
USSR: N. p.,
1990.
Web.
Harutunyan, V V, Gevorkyan, V A, & Grigoryan, N E.
Vacuum ultraviolet luminescence excitation spectra of {alpha}-Al{sub 2}O{sub 3} single crystals.
USSR.
Harutunyan, V V, Gevorkyan, V A, and Grigoryan, N E.
1990.
"Vacuum ultraviolet luminescence excitation spectra of {alpha}-Al{sub 2}O{sub 3} single crystals."
USSR.
@misc{etde_10118645,
title = {Vacuum ultraviolet luminescence excitation spectra of {alpha}-Al{sub 2}O{sub 3} single crystals}
author = {Harutunyan, V V, Gevorkyan, V A, and Grigoryan, N E}
abstractNote = {The luminescence excitation spectra of corundum single crystals irradiated with 50 MeV electrons were studied. In the region of fundamental absorption there appeared excitation bands (blue and ultraviolet) which correlated well with optical absorption bands of the F{sup +}-centre in the absorption (reflection) spectra. The excitonic peaks observed in the excitation spectra of red luminescence were explained by the charge energy transfer by Cr{sup 2+}, Cr{sup 4+} ions at excitonic excitation. At {Dirac_h}{nu} > 9.5 eV there appeared sharp drops which were interpreted as nonirradiative near-surface recombinations. 8 refs.; 3 figs.}
place = {USSR}
year = {1990}
month = {Dec}
}
title = {Vacuum ultraviolet luminescence excitation spectra of {alpha}-Al{sub 2}O{sub 3} single crystals}
author = {Harutunyan, V V, Gevorkyan, V A, and Grigoryan, N E}
abstractNote = {The luminescence excitation spectra of corundum single crystals irradiated with 50 MeV electrons were studied. In the region of fundamental absorption there appeared excitation bands (blue and ultraviolet) which correlated well with optical absorption bands of the F{sup +}-centre in the absorption (reflection) spectra. The excitonic peaks observed in the excitation spectra of red luminescence were explained by the charge energy transfer by Cr{sup 2+}, Cr{sup 4+} ions at excitonic excitation. At {Dirac_h}{nu} > 9.5 eV there appeared sharp drops which were interpreted as nonirradiative near-surface recombinations. 8 refs.; 3 figs.}
place = {USSR}
year = {1990}
month = {Dec}
}