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Journal of Physical Studies 17(2), Article 2201 [7 pages] (2013)
DOI: https://doi.org/10.30970/jps.17.2201 STUDIES OF CONCENTRATION DEPENDENCIES IN THE LUMINESCENCE OF TITANIUM DOPED Al2O3 USING SYNCHROTRON RADIATIONV. B. Mikhailik{1,2}, V. S. Tsybulskyy{3}
{1}Department of Physics, University of Oxford, Keble Road, |
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Luminescence and excitation spectra of Ti doped Al$_{2}$O$_{3}$ have been investigated at 8 and 300 K using synchrotron radiation. For these studies the samples of Al$_{2}$O$_{3}$ doped with Ti of 10, 50, 100, 500, 1000 ppm; also, anion-deficient Al$_{2}$O$_{3}$ have been prepared at the same conditions. It is found that simple $F$-centre model of blue luminescence at 420 nm in doped Al$_{2}$O$_{3}$-Ti should be replaced by a new model of ‟Ті$^{4+}-F$'-centre”. The model explains the concentration quenching of blue emission with an increase of titanium concentration. In doped Al$_{2}$O$_{3}$-Ti with $ \ge $500 ppm, new luminescence band at 600 nm with the excitation of 5.9 eV was detected and the origin of this band is discussed.
PACS number(s): 29.40.Mc, 78.45.+h, 78.55.Hx