期刊
JOURNAL OF RARE EARTHS
卷 29, 期 6, 页码 540-543出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(10)60494-2
关键词
photoluminescence; CaMoO4:Dy3+; charge compensator; solid-state reaction; rare earths
资金
- Hebei University Postdoctoral Research Station of Optical Engineering
- Natural Science Foundation of Hebei Province [A2010000184]
A series of CaMoO4 phosphors doped with trivalent dysprosium ions (Dy3+) and lithium (Li+) were prepared by solid state method at 750 degrees C for 3 h. X-ray diffraction (XRD) confirmed the crystal structure and quality of phosphors. Scanning electron microscopy (SEM) indicated that the phosphors presented good crystalline state, and the crystalline grain sizes were about 0.5-3.0 mu m. The emission spectra showed that the phosphors had intense emission at 480 (F-4(9/2)-> H-6(15/2)), 576 (F-4(9/2)-> H-6(13/2)) and 660 nm (F-4(9/2)-> H-6(11/2)). Meanwhile, the excited spectra indicated it had intense excitation at 352 (H-6(15/2)-> P-6(7/2)), 390 (H-6(15/2)-> M-4(21/2)) and 450 nm (H-6(15/2)-> I-4(15/2)). As a charge compensator, Li+ ions were incorporated into CaMoO4:Dy3+ phosphors, which enhanced the PL intensities depending on the doping concentration of Li+. The optimal molar fraction of Dy3+ ions in Ca1-xMoO4:xDy(3+), 0.05Li(+) was 0.05.
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