The Study In Spectral Properties Of γ-Al₂O₃ Materials Doped With Rare-earth Ions By Sol-Gel Methord

The development of optical communication system ,specially the All Optic Network, inducing the study interest of broadband optical amplifier and the luminescence materials. In this paper ,theγ-Al₂O₃ materials doped with Er³⁺, Er³⁺/Yb³⁺, Er³⁺/Yb³⁺/Ce³⁺ used for Waveguide Amplifier have been made by Sol-Gel method. The TG/DTG and XRD indicate the best thermal treatment temperature is 900℃, the samples formγphase at this temperature ,and would be other phase over 1000℃. The rare-earth ions don't change the phase of Al₂O₃, just heighten the phase transformation temperature. The PL spectra show that all the samples with different concentration have emission in visible and near-infrared area. There are also strong up-conversation emission in visible with peaks at 650nm and 535nm,665nm,602nm.The samples co-doped with Er³⁺/Yb³⁺ show strongly near-infrared emission at 1534nm ,the intensity increased about 6-7 times compared with samples doped with Er³⁺. There is a best ratio of Er³⁺/Yb³⁺, it is Er³⁺:Yb³⁺=1:6 inγ-Al₂O₃. The doping of Ce³⁺ ions not only increases the near-infrared emission, but also decreases the up-conversation of th samples in visible area.We get Er³⁺/Yb³⁺ co-dopedγ-Al₂O₃ films used for EDWA making by sol-gel and spin-coating method. Tested the PL spectra ,and the AFM pictures indicate that the films have RMS roughness about 10-20nm, which could satisfy the needs of waveguide making. The results are useful for the development of broadband waveguide amplifier.