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| Effect of Cr3+ Doping on Structure and Photoluminescence of Al2O3 Powders |
| SUN Naikun, GAO Yinbo, YANG Jian, LIU Feng, CAI Zongqi, XU Songning |
| School of Science, Shenyang Ligong University, Shenyang 110159 |
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Cite this article:
SUN Naikun GAO Yinbo YANG Jian LIU Feng CAI Zongqi XU Songning. Effect of Cr3+ Doping on Structure and Photoluminescence of Al2O3 Powders. Chin J Mater Res, 2011, 25(5): 557-560.
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Abstract Cr3+ : Al2O3 nano-powders were prepared by ball milling method and annealed at 700℃ or 1200℃ for 2 h in the air. The samples annealed at 1200℃ are of single phase with the α–Al2O3 structure, except that there are some low-intensity peaks of γ–Al2O3 appearing in the Cr(1.6%)–doped sample. The samples' lattice constants increase with the increase of the doping of Cr3+ ions. Using the excitation source with a wavelength of 579 nm, the photoluminescence (PL) spectra of all the samples shows a strong emission band between 469 nm and 492 nm, which is ascribed to the absorption of F+ color center. The samples annealed at 1200℃ show a strong emission band at 694 nm caused by the transition of Cr3+ ions’ electronics from 2A to 4A2 and the 0.3% Cr doped sample shows the greatest fluorescence emission intensity. When the doped concentration was greater than 0.3%, too many Cr3+ ions can couple and lead to concentration quenching. In contrast, for the samples annealed at 700 !, only the 0.3% Cr doped sample exhibits a low–intensity emission peak at 694 nm.
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Received: 04 July 2011
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| Fund: Supported by Dr Research Start-up Fund of Shenyang Ligong University No.2008(20). |
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