Abstract
Ce3+ and Tb3+ activated Sr2LiSiO4F phosphors were prepared by a solid state reaction technique at high temperature, and their ultraviolet (UV)-visible spectroscopic properties were investigated. Under ultraviolet light excitation, Ce3+-doped Sr2LiSiO4F phosphors emit blue light (420 nm), while Tb3+-doped phosphors show yellowish green emission. Efficient energy transfer from Ce3+ to Tb3+ ions in co-doped samples was confirmed in terms of corresponding excitation and emission spectra. The energy transfer mechanism between Ce3+ and Tb3+ was discussed and demonstrated to be dipole–dipole interaction in Sr2LiSiO4F:Ce3+,Tb3+ phosphors. Due to energy transfer from Ce3+ to Tb3+, Ce3+ and Tb3+ co-doped Sr2LiSiO4F phosphors show intense absorption in near-UV region, and present tunable emission from blue to bluish green under 360 nm light excitation. The results indicate that these phosphors can be considered as candidates for white LEDs pumped by n-UV chips.
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