Abstract
Transparent glass ceramics containing YF 3 nano-crystals were fabricated by heat treatment of the SiO 2–Al 2O 3–NaF–YF 3–LnF 3 (Ln = Er, Yb) glasses. X-ray diffraction and transmission electron microscopy analyses evidenced the homogeneous distribution of spherical YF 3 nano-crystals sized 25–30 nm among the glassy matrix. Energy dispersive X-ray spectroscopy measurement, combined with the Stark splitting of the absorption and emission bands, verified the incorporation of Er 3+ and Yb 3+ ions into YF 3 nano-crystals. The infrared to visible up-conversion emission of Er 3+ intensified with the increasing of Yb 3+ concentration, ascribing to the increase of the efficiency of non-radiative energy transfer from Yb 3+ to Er 3+ which exceeded 45% for the 0.5Er 3+/1.0Yb 3+ co-doped sample. The up-conversion luminescence at 545 and 660 nm were affirmed coming from two-photon excitation process.
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