期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 625, 期 -, 页码 149-157出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.11.128
关键词
Optical materials; Glass ceramics; Upconversion; Nanocrystals; Optical properties
资金
- Nature Science Foundation of Zhejiang Province [LQ13E020003]
- National Natural Science Foundation of China [21104068, 21271170, 61372025, 51402077]
- Natural Science Foundation of Fujian for Distinguished Young Scholars [2012J06014]
- Educational Commission of Zhejiang Province of China [Y201121238]
- Zhejiang Province Public Welfare Project [2012C23098]
Lanthanide-activated cubic Na5Gd9F32 nanocrystals were precipitated from a borosilicate glass with a specifically designed composition. The precursor glass is already phase-separated after melt-quenching, which is beneficial to the realization of the controllable glass crystallization for affording desirable size, morphology and activator partition. Elemental mapping in the scanning transmission electron microscopy evidenced that the segregation of lanthanide ions into the Na5Gd9F32 lattice was in situ formed without the requirement of long-range ionic diffusion. Impressively, such fabricated glass ceramic co-doped with Yb3+/Er3+ ions exhibited intense upconversion luminescence, which was about 500 times higher than that of the precursor glass, and its luminescent color could be easily tuned from red to green by controlling glass crystallization temperature. It is anticipated that such phase-separation synthesis strategy with precise control over nanostructure of glass ceramics offer a great opportunity to design other highly transparent nanocomposites with a wide range of tunable optical properties. (C) 2014 Elsevier B.V. All rights reserved.
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