Comparative study of the luminescence of Al₂O₃:Ti and Al₂O₃ crystals under VUV synchrotron radiation excitation

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• 作者：Yu. Zorenko ; T. Zorenko ; T. Voznyak ; S. Nizhankovskiy ; E. Krivonosov ; A. Danko ; V. Puzikov
• 关键词：Al2O3 crystal ; Ti3+ dopant ; Luminescence ; Excitons ; F+ and F centers
• 刊名：Optical Materials
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：35
• 期：12
• 页码：2053-2055
• 全文大小：321 K

文摘

The comparative study of the luminescent properties of Al₂O₃:Ti crystal in comparison with those for undoped Al₂O₃ crystal counterpart is performed under synchrotron radiation excitation with an energy of 3.7-25 eV. Apart from the main emission band peaked at 725 nm related to the ²E ¡ú ²T₂ radiative transitions of Ti³⁺ ions, the luminescence of excitons localized around Ti ions in the band peaked at 290 nm and the luminescence of F⁺-Ti and F-Ti centers in the bands peaked at 325 and 434 nm are also found in the emission spectra of Al₂O₃:Ti crystal. We show also that the luminescence of Ti³⁺ ions in Al₂O₃:Ti crystal can be effectively excited by the luminescence of excitons localized around Ti dopant as well as by the luminescence of F-Ti centers.