Journal
JOURNAL OF RARE EARTHS
Volume 31, Issue 7, Pages 665-668Publisher
ELSEVIER
DOI: 10.1016/S1002-0721(12)60339-1
Keywords
luminescence; solid solution; thermal quenching; concentration quenching; rare earths
Categories
Funding
- National Natural Science Foundation of China [50902011]
- National Hi-Tech R & D Program of China (863 Program) [2011AA03A101]
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Sr3-z(Al-x,Si1-x)O5-xFx:zCe(3+) phosphors were synthesized by high-temperature solid-state reaction. The structure and luminescence properties of phosphors with various Al/Si ratios and Ce3+ concentrations were characterized using various methods such as X-ray diffraction, photoluminescence excitation and photoluminescence spectra. XRD result displayed that a complete solid solution between Sr3AlO4F and Sr3SiO5 was formed. With the increasing of x value, a broader excitation band and stronger absorption appeared in the blue light region. Moreover, the emission band shifted to a shorter wavelength and the emission intensity reached a maximum at x=0.6. By adjusting the concentration of Ce3+, a widely tunable range of emission wavelength under the excitation of 460 um was obtained from the green to yellow regions. In addition, the concentration and thermal quenching were also discussed.
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