Volume 126 (2018) Issue 3 Pages 178-183
Up-converting of GdTiNbO6-based complex oxide co-doped with 5 mol % Er3+ and 10 mol % Yb3+ (GdTiNbO6:Er3+/Yb3+) was conducted through a mild hydrothermal route. A single phase of aeschynite-type GdTiNbO6:Er3+/Yb3+ was crystallized under weak basic hydrothermal conditions at 240°C for 5 h. The aeschynite-type structure was maintained after heating up to 1050°C for 1 h in air. A single phase of euxenite-type GdTiNbO6:Er3+/Yb3+ was formed by heating at 1300°C for 1 h through phase transformation. The GdTiNbO6:Er3+/Yb3+ emitted luminescence in the green spectral region from 515 to 560 nm (2H11/2 and 4S3/2 levels) under direct and indirect excitation of Er3+ at wavelengths of 377 and 277 nm, respectively, in addition to up-converted luminescence under excitation at 980 nm. The luminescence intensity was enhanced by high-temperature heating.