Abstract
With K+ as charge compensator, a series of KSr4(BO3)3:Dy3+, Tb3+ phosphors were successfully synthesized by solid–state reaction process. Under near-ultraviolet excitation (389 nm), the green emission of Tb3+ is observed in Dy3+/Tb3+ codoped samples due to the efficient energy transfer from Dy3+ to Tb3+. The energy transfer efficiency, average donor-acceptor distance, as well as transfer mechanism were also studied. The energy transfer efficiency of KSr4(BO3)3:Dy3+, xTb3+ increased gradually and reached about 60% when the concentration of Tb3+ was 0.030. And the critical distance RDy-Tb was calculated to be 15.36 Å. Moreover, the energy transfer mechanism from Dy3+ to Tb3+ in KSr4(BO3)3 host was demonstrated to be dipole–dipole interaction. In addition, the emitting colors of Dy3+/Tb3+ codoped samples can be adjusted from the edge of white area to green via tuning the Tb3+ doped concentration.
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