Abstract
A series of single- and co-doped KMg4(PO4)3:Ce3+, Tb3+ phosphors, which are good candidates for UV-excited white-LEDs, were synthesized by a solid-state reaction method. The substitution of Ce3+ and Tb3+ in the lattice of KMg4(PO4)3 is thoroughly discussed, since it is an example of non-equivalence substitution; thus, it is proposed that both Ce3+ and Tb3+ take the position of K+ ions while interstitial O2- ions exist in the tunnels form in the KMg4(PO4)3 crystal to balance the excess of positive charge. The experimental results showed that single doped KMg4(PO4)3:Ce3+ and KMg4(PO4)3:Tb3+ phosphors can be effectively excited by ultraviolet light, resulting in intense blue and green emissions, respectively. In co-doped phosphors, Ce3+ greatly enhances the emission intensity of Tb3+ through the energy transfer mechanism from Ce3+ to Tb3+, which is a resonant type and occurs via dipole–quadrupole interactions.
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