Plasmonic Au _x Ag _y bimetallic alloy nanoparticles enhanced photoluminescence upconversion of Er3+ ions in antimony glass hybrid nanocomposites

摘要

Er3+ ions and spherical (3-23 nm) Au _x Ag _y bimetallic alloy (where x = 18-96 and y = 4-82, atom %) nanoparticles incorporated novel antimony oxide based reducing dielectric (glass) matrix, K₂O-B₂O₃-Sb₂O₃ (KBS), has been synthesized by a new single step methodology involving selective thermochemical reduction. Their absorption spectra show a single tunable (536-679 nm) surface plasmon resonance band along with the typical absorption peaks of the Er3+ ion. X-ray and SAED indicate the formation of (111) and (200) planes of Au _x Ag _y alloy. The luminescence intensity of two prominent emission bands of Er3+ ions centered at 536 (green) and 645 (red) nm due to 4S_3/2 → 4I_15/2 and 4F_9/2 → 4I_15/2 transitions were observed to be strongly dependent on the Au _x Ag _y nanoparticle composition. Both the bands undergo a maximum of 1.5- and 4.5-fold intensity enhancement respectively in the presence of the Ag₅₆Au₄₄ alloy (atom %) due to plasmon induced local field enhancement.View full textDownload full textKeywordsgold-silver alloy nanoparticles, erbium (III), nanocomposite, upconversion, enhanced fluorescence, antimony oxide glassRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/09500340.2011.586472