Luminescence of Oxygen Centers in Aluminum Nitride
The electronic structure of the luminescent centers of non-activated AlN is studied by the method of emission and excitation spectra. Besides the UV-band with the maximum at 3.37 eV, “self-activated” AlN reveals a band at 2.33 eV in the visible, the position of which depends on the wavelength of the exciting radiation. The corresponding excitation spectra have rather complex structure with bands at (4.15 ± 0.05) eV and (4.50 ± 0.005) eV at T = 300 K. The observed excitation bands are in good agreement with the absorption spectra, which are considered to be caused by oxygen.
KeywordsExcitation Spectrum Oxygen Center Aluminum Nitride Exciting Radiation Oxygen Impurity
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