Enhanced fluorescence from Eu3+ in low-loss silica glass-ceramic waveguides with high SnO2 content

Bhaktha, S. N. B.; Beclin, F.; Bouazaoui, M.; Capoen, B.; Chiasera, A.; Ferrari, M.; Kinowski, C.; Righini, G. C.; Robbe, O.; Turrell, S.
November 2008
Applied Physics Letters;11/24/2008, Vol. 93 Issue 21, p211904
Academic Journal
We report on the sol-gel fabrication and characterization of (100-x)SiO2–xSnO2 (x=8, 16, and 25 mol %) glass-ceramic waveguides doped with 1 mol % Eu3+. A suitable top-down thermal process led to the formation of SnO2 nanocrystals ∼4 nm embedding Eu3+ ions. The excitation spectra evidence the role of interband electronic transition of SnO2 nanocrystals on the luminescence of Eu3+. Monitoring the 5D0→7F2 Eu3+ emission, we observe about 15 times increase in the intensity of SnO2 absorption band, moving from x=8 to 25 mol %. These waveguides also exhibit low losses, making them quite promising for development of high-gain integrated optical amplifiers.


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