It is well known that metallic structures have complex effects on fluorescence. In addition to an enhancement in fluorescence from the enhancement of the local electromagnetic field, placing a metallic structure in the vicinity of an Er3+ ion also leads to a modification of both the radiative and the nonradiative rates, inducing changes in both the fluorescence lifetime and the emission intensity. In particular the Au nanoparticles (NPs) have promising applications as bright fluorescent markers with enhanced photostability in fluorescence microscopy, sensor technology, and microarrays. Besides, important factors affecting the strength of the fluorescence enhancement are the size and shape of the nanoparticle, the overlap of the absorption and emission bands of the Er3+ with the plasmon band of the metal, and the radiative decay rate and quantum yield of the fluorescent ions. On the other hand, tellurite glass they have attracted interest for optoelectronic and photonic applications because the emission in the windows the telecommunication optical is due the 4f ↔ 4f transitions, spatiality 4I13/24I15/2 involving process of upconversion. These intensities of transitions depend strongly on the nature and the structure chemical environment around the rare-earth ion.

© 2010 Optical Society of America

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