期刊
JOURNAL OF RARE EARTHS
卷 29, 期 1, 页码 39-43出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(10)60405-X
关键词
SrAl2O4: Eu2+,Dy3+; sol-gel method; flower-like phosphor; luminescence; rare earths
资金
- National Natural Science Foundation of China [20671042, 50872045]
- Natural Science Foundation of Guangdong Province [05200555, 7005918]
A flower-like Eu2+ and Dy3+ co-doped SrAl2O4 long-lasting phosphorescent (LLP) phosphor was synthesized via the inorganic-saltbased sol-gel method. The crystal structure, morphology and optical properties of the composite were characterized. X-ray diffraction diffusion (XRD) data and DSC-TG curves of the phosphor revealed that the SrAl2O4 crystallites have been formed after the precursor was calcined at 900 degrees C and to be single-phase SrAl2O4 at 1100 degrees C. The SEM photographs indicated that the sample exhibited a universal flower-like morphology with crystallite size of about 1-2 mu m. After being irradiated with ultraviolet (UV) light, the flower-like phosphor emitted long-lasting green phosphorescence with an excitation peak at 365 nm and emission peak at 500 nm which was ascribed to the characteristic 5d-4f transition of Eu2+. Both the PL spectra and the luminance decay curve revealed that this phosphor exhibited efficient luminescence and long lasting properties.
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