期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 94, 期 7, 页码 2135-2140出版社
WILEY
DOI: 10.1111/j.1551-2916.2010.04374.x
关键词
-
资金
- [IP2010032570]
In this work, we have examined modifications of structural and optical properties of Y3Al5O15:Ce3+ (Ce3+:YAG) material when transforming from nanograins to nanoceramic form under high pressure. Initial YAG material with 0.5% of Ce3+ was prepared using modified Pechini and transformed to nanoceramic at low temperature with a working pressure of 4 GPa. Structural properties of both samples (nanopowder and nanoceramic) have been examined with X-ray diffraction and scanning electron microscope. Optical properties have been examined using photoluminescence (PL) spectroscopy, PL-excitation spectroscopy at different temperatures, and time-resolved spectroscopy. Based on results obtained, excitation mechanism of Ce3+ ions has been explained. The main 560 nm emission band along with a new 400 nm emission band allowed to cover the whole visible spectral range. Moreover, it has been found that under high-pressure treatment the amorphous shell of YAG core appears, leading to increased 5d electrons-lattice interaction. This, in turn, reduces PL decay time and increases emission intensity of nanoceramic sample.
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