Abstract
This work reports a new luminescence host, Yb3+-condensed fluorosilicate apatite Sr4Yb6(SiO4)6F2. Pure and Eu3+-doped Sr4Yb6(SiO4)6F2 dense ceramics were prepared via the solid-state reactions. The apatite-like structural features were confirmed via XRD Rietveld refinements. The optical absorption, down-conversion (DC) and up-conversion (UC) luminescence, and dynamic decays of Sr4Yb6-6xEu6x(SiO4)6F2 (x = 0, 0.01, 0.05, 0.1, 0.15) were investigated. In the DC with UV-light excitation, near-IR emission efficiency of Sr4Yb6(SiO4)6F2 can be greatly enhanced by Eu3+-doping via significant energy transfer from Eu3+ ions to Yb3+. The luminescence mechanisms were explained on the cross-relaxation (CR) processes between Eu3+ donors and Yb3+ acceptors. Up-conversion (UC) luminescence was detected via 974 nm excitation into 2F7/2 states of Yb3+, which occurs in green cooperative luminescence (CL) from Yb-pairs and UC red emissions of Eu3+ ions. Unlike the case of DC luminescence under UV light, CL of Yb3+ decreases quickly with the increase of Eu3+ doping; meanwhile, the up-converted red luminescence of Eu3+ shows only a small increase. The energy transfer mechanism was discussed via cross-relaxation between Yb3+ and Eu3+ ions.
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