Abstract
A series of new luminescent emission-tunable phosphors Sr2La8(SiO4)6O2:Ce3+, Tb3+ with apatite structure have been synthesized by a high temperature solid-state reaction. The phase structure, photoluminescence emission and excitation spectra, lifetime, as well as the effect of Tb3+ concentration are investigated to characterize the resulting samples. The critical distance was calculated to be 8.26Å by using the concentration quenching method. The intense green emission was observed in the Sr2La8(SiO4)6O2:Ce3+, Tb3+ phosphors on the basis of the efficient energy transfer from Ce3+ to Tb3+ with an efficiency of 68.55%. And a possible mechanism of the energy-transfer from Ce3+ to Tb3+ ion is also proposed. The results indicate that Sr2La8(SiO4)6O2:Ce3+, Tb3+ phosphors have potential applications to be used as near UV-convertible phosphors for white light-emitting diodes because of the broad excitation in the near-ultraviolet range and the efficient green emission light.
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