Sub-nanometric metallic Au clusters as efficient Er3+ sensitizers in silica

Silica films co-implanted with Er and Au ions show an enhancement of rare earth photoluminescence after gold introduction in the matrix. Er excitation originates in a broad spectral region, from the red to the near ultraviolet. We have investigated the influence of gold aggregation on the optical pr...

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Veröffentlicht in:Applied physics letters 2006-10, Vol.89 (15)
Hauptverfasser: Trave, Enrico, Mattei, Giovanni, Mazzoldi, Paolo, Pellegrini, Giovanni, Scian, Carlo, Maurizio, Chiara, Battaglin, Giancarlo
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Sprache:eng
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Zusammenfassung:Silica films co-implanted with Er and Au ions show an enhancement of rare earth photoluminescence after gold introduction in the matrix. Er excitation originates in a broad spectral region, from the red to the near ultraviolet. We have investigated the influence of gold aggregation on the optical properties of co-doped samples by varying the temperature of post-Au implantation annealing in the 400–900°C range. Optical measurements and extended x-ray absorption analysis support the hypothesis of an energy transfer process mediated by sub-nanometric Au aggregates with metallic character that are optically activated mostly through electron interband transitions between d and sp-conduction levels.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2266229