Abstract
Co-doped gadolinium oxides, Gd1.98−xYbxEr0.02O3 were synthesized by a flux method, and their up- and down-conversion characteristics were investigated. For 980nm excitation, green and red up-conversion emissions were observed. The color coordinates on the Commission Internationale de I’Eclairage chromaticity diagram shifted along a straight line from green to red with an increase in the Yb3+ content x. For 365nm excitation, the intensity of the down-conversion emission decreased with an increase in x, owing to the quenching of the excitation energy of Er3+ by the Yb3+ ions. The up- or down-conversion emissions are observed up to 100°C. For Gd1.98−xYbxEr0.02O3, x=0.04 was appropriate for the bidirectional wavelength conversion.
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