Cathode-luminescence property of Er3+/Yb3+-doped amorphous GeO2

Abstract Luminescence property of erbium (Er)-doped GeO 2 has been studied with cathode-luminescence analysis. GeO 2 material has exhibited strong luminescence at wavelength 1537 nm compared to Er-doped SiO x . By co-doping with ytterbium (Yb), luminescence increased with Er concentration 0.2–0.4 mol%. On the other hand, in higher Er concentration, energy could not be transferred between Er and Yb effectively. The fabrication of a single mode channel waveguide could not be achieved using our GeO 2 as the host material. This is probably due to the cracks generated in the film resulting from thermal annealing and wet process.