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Journal of Sol-Gel Science and Technology

Photoluminescence in Er3+/Yb3+-doped silica-titania inverse opal structures

M. Clara Gonçalves, Luís M. Fortes, Rui M. Almeida, Alessandro Chiasera, Andrea Chiappini, Maurizio Ferrari, S.N.B. Bhaktha

Published Apr 28, 2010• 18 citations
Publisher
DOI
10.1007/s10971-010-2212-y

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The effects of Au thin layers on luminescence properties of Er and Yb co-doped Al2O3 films were studied. The 1.54μm emission of Er3+ excited by the energy transfer from Yb3+ is found to be strongly enhanced by placing a Au layer on top of the films. Photoluminescence excitation spectra of the 1.54μm PL of Er3+ and time transients of the 980nm emission of Yb3+ revealed that PL enhancement arises from two different mechanisms. The first one is the enhancement of local electric fields accompanied by the excitation of surface plasmons of rough Au surfaces. The other one is the enhancement of energy transfer rate from Yb3+ to Er3+ caused by the modification of the local photonic mode density at the position of the Yb–Er coupled system.