期刊
OPTICAL MATERIALS EXPRESS
卷 12, 期 6, 页码 2318-2331出版社
Optica Publishing Group
DOI: 10.1364/OME.459189
关键词
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资金
- Deutsche Forschungsgemeinschaft [WO1220/15]
- European Research Council [681652]
- European Research Council (ERC) [681652] Funding Source: European Research Council (ERC)
This study presents a simple technique to enhance the photoluminescence of europium(III) using silver clusters in sol-gel coatings. Under certain excitation conditions, a significant enhancement in emission is observed, with silver clusters showing broader excitation range and stronger amplification compared to metallic nanoparticles.
Photoluminescence (PL) is a key mechanism for many light conversion applications but often provides only low yield and poor efficiency due to a small interaction cross-section and a relatively narrow range of spectral activity. Here, we present a simple technique to enhance the PL of europium(III) (Eu3+) from sol-gel coatings on the surface of a side-emitting optical fiber. We use small clusters of Ag to boost the emission of Eu3+ by an energy transfer mechanism. The coating???s performance is studied as a function of Ag concentration and annealing time. We report a substantial enhancement in Eu3+ emission under resonant and non-resonant excitation with UV light. However, this enhancement vanishes when the Ag clusters grow into larger nanoparticles with plasmon activity: we demonstrate that silver clusters produce stronger amplification with a broader excitation range than metallic nanoparticles. Moreover, these clusters are easily generated and stabilized in a coating using standard sol-gel techniques, suitable for deposition on the surface of side-emitting fibers. Such fibers can then be employed as line-shaped emitters, for example, for structured illumination purposes.
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