期刊
JOURNAL OF LUMINESCENCE
卷 132, 期 2, 页码 261-265出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2011.08.045
关键词
Microwave solvothermal route; Phosphor; Al2O3:Tb3+; Photoluminescence
类别
资金
- China Postdoctoral Science Foundation [200902584]
- Shaanxi Provincial Department of Education [09JK355]
- Shaanxi University of Science and Technology
Al2O3:Tb3+ green phosphors were synthesized via a microwave solvothermal and thermal decomposition route, and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL) spectra, and decay curves. XRD results indicate that Tb3+ doped samples are gamma-Al2O3 after being calcined at 773 K. SEM results show that the particles of Al2O3:Tb3+ are hierarchically nanostructured microspheres assembled from nanosheets. The PL spectra indicate that the D-5(4)-> F-7(5) (545 nm) electric dipole transition is the most intensive when excited at 235 nm. It is shown that 0.7 mol% of doping concentration of Tb3+ ions in gamma-Al2O3:Tb3+ is optimum. According to Dexter's theory, the critical distance between Tb3+ ions for energy transfer was determined to be 18.4 angstrom. It is found that the curve followed the single-exponential decay. The excellent chromaticity coordinates of Al2O3:Tb3+ phosphors, as defined by the International Commission on Illumination (CIE), indicate that it is a good candidate for use in light display systems and optoelectronic devices. (C) 2011 Elsevier B.V. All rights reserved.
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