کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1486495 | 1510557 | 2006 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Spectroscopic properties of Cr3+ ions in nanocrystalline glass–ceramic composites Spectroscopic properties of Cr3+ ions in nanocrystalline glass–ceramic composites](/preview/png/1486495.png)
Luminescence properties of Cr3+ ions in a silica-based precursor glass, and in fabricated optically transparent glass-based nanocrystalline composites, have been investigated. The luminescence spectra of the precursor glass revealed a wide range of crystal fields and showed the 4T2–4A2 broadband emission of Cr3+ ions in a weak crystal field, combined with 2E–4A2 emission characteristic for Cr3+ ions in a strong crystal field. Glass–ceramic nanocomposites, with gallium oxide nanocrystals nucleated in a host glass matrix, indicated the prevailing contribution of the crystal-like 2E–4A2 emissions (R-lines) of Cr3+ ions in a strong crystal field. The low-temperature studies demonstrated that the fluorescence of Cr3+ ions could be altered from sharp R-lines of the 2E–4A2 transition, below 70 K, to a combination of R-lines and their sidebands, above 70 K. Our results indicate that, in the developed glass–ceramic nanocomposites, most of the Cr3+ ions have migrated from the host glass matrix to the nucleated gallium oxide nanocrystalline phase.
Journal: Journal of Non-Crystalline Solids - Volume 352, Issues 6–7, 15 May 2006, Pages 524–527