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Abstract
Silica-gold core-shell nanoparticles were used for plasmonic enhancement of rare earth fluorescence in sol-gel-derived TiO2:Sm3+ films. Local enhancement of Sm3+ fluorescence in the vicinity of separate gilded nanoparticles was revealed by a combination of dark field microscopy and fluorescence spectroscopy techniques. An intensity enhancement of Sm3+ fluorescence varies from 2.5 to 10 times depending on the used direct (visible) or indirect (ultraviolet) excitations. Analysis of fluorescence lifetimes suggests that the locally stronger fluorescence occurs because of higher plasmon-coupled direct absorption of exciting light by the Sm3+ ions or due to plasmon-assisted non-radiative energy transfer from the excitons of TiO2 host to the rare earth ions.PACS78; 78.67.-n; 78.67.Bf
Highlights
Noble metal nanoparticles are under intense scientific and applied attention because of their unique optical properties [1]
We propose to utilize silica-gold core-shell nanoparticles described earlier by Pham et al [9] for the enhancement of RE3+ fluorescence
TiO2:Sm3+ films doped with gilded nanoparticles were obtained
Summary
Noble metal nanoparticles are under intense scientific and applied attention because of their unique optical properties [1]. Incident light which is in resonance with the collective electronic oscillations near the surface of metal nanoparticles causes the so-called localized surface plasmon resonance. It results in strong concentration of light energy and electric field in the subwavelength nanoscale region near the particle. ; ð1Þ where A1, A2, and A3 are the coefficients of light intensity, τ1, τ2, τ3 are the lifetimes of fluorescence In such situation, the overall rate of decay is frequently characterized by the average lifetime defined as Z∞ tIðtÞ dt X Aiτi hτi 1⁄4 1⁄4 X i Aiτi ð2Þ IðtÞ dt i.
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