Luminescence enhancement of rhodamine 6G in sol-gel films containing silver aggregates

Reisfeld, R.; Eyal, M.; Brusilovsky, D.

doi:10.1016/0009-2614(88)85214-x

Cited by 80 publications

(26 citation statements)

References 14 publications

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“…98 The aggregates gave an overall increase in absorption and emission of the dye due to energy transfer between the fluorescent dye molecules and the silver particles (interaction between the electric dipole of the dye and the localized electron clouds on each of the silver islands).…”

Section: Spie Vol 1328 Sol-gel Optics 1990) 285mentioning

confidence: 99%

Sol-Gel Optics: Proceedings SPIE-The International Society for Optical Engineering Held in San Diego, California on 11-13 July 1990. Volume 1328

Mackenzie¹,

Ulrich²

1992

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Section: Spie Vol 1328 Sol-gel Optics 1990) 285mentioning

confidence: 99%

Sol-Gel Optics: Proceedings SPIE-The International Society for Optical Engineering Held in San Diego, California on 11-13 July 1990. Volume 1328

Mackenzie¹,

Ulrich²

1992

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“…There have been only a few attempts for the generation of Ag colloids in sol-gel materials [8,9] by dissolving AgNO3 in an appropriate sol prepared from tetraethoxysilane (TEOS) [8] or tetramethoxysilane (TMOS) [9]. Reduction was carried out using a reducing agent (formaldehyde [8] or Sn 2+ [9]), but using this route a broad size distribution and agglomeration of Ag colloids could not be avoided, even at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ag-colloids in sol-gel derived SiO2-coatings on glass

Mennig

Schmitt

Schmidt

1997

J Sol-Gel Sci Technol

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Abstract. Ag colloid-containing coatings on soda lime glass and fused silica are prepared via the sol-gel process. To incorporate Ag +-ions in the coatings homogeneously, they are stabilized by a functionalised silane (aminosilane) and then mixed with the basic sol prepared from 3-glycidoxypropyl trimethoxysilane (GPTS) and tetraethoxysilane (TEOS). Crack-free and transparent coatings with a thickness of 0.5 to 1.2/zm, are obtained by heat treatment between 120~ and 600~ The Ag-colloid formation was monitored by UV-VIS spectroscopy as a function of temperature. The investigations reveal that the substrate has a deciding influence on the Ag-colloid formation caused by alkali diffusion from the substrate into the coating. High resolution transmission electron microscopy (HRTEM) investigations prove that poly-crystalline AgxOy-nanoparticles are formed during thermal densification in the coatings and that this change is accompanied by a vanishing of the yellow colour of the coatings. A post-heat treatment in a reducing atmosphere (90% N2, 10% Ha) turns back the yellow colour and single-crystalline Agcolloids can be detected by HRTEM. A suitable choice of the temperature and time conditions allows the control of the colloid size during heat treatment in a reducing atmosphere. For comparison, ion-exchange experiments have been carried out which showed that a spontaneous Ag-colloid formation was achieved in the soda lime substrate at 400~ Since Ag containing SiO2-coatings remained colourless after thermal treatment between 400~ and 600~ in air, on soda lime substrates, a remarkable diffusion of Ag + into the substrate was excluded.

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“…A twofold enhancement of steady state luminescence of rhodamine 6 G has been observed when it is doped with silver [22]. The presence of silver aggregates causes substantial depolarization of the luminescence and the electromagnetic interaction between Ag surface plasmons and dye molecules can result, under certain conditions, in an enhanced fluorescence quantum efficiency and photostability of the dye.…”

Section: Resultsmentioning

confidence: 93%

Spectral and nonlinear optical characteristics of nanocomposites of ZnO–Ag

Irimpan

Nampoori

Radhakrishnan

2008

Chemical Physics Letters

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a b s t r a c tIn this Letter we present the spectral and nonlinear optical properties of ZnO-Ag nanocomposites prepared by colloidal chemical synthesis. Obvious enhancement of ultraviolet (UV) emission of the samples is observed and the strongest UV emission is over three times than that of pure ZnO. These nanocomposites show self-defocusing nonlinearity and good nonlinear absorption behaviour which increases with increasing Ag volume fraction. The observed nonlinear absorption is explained through two photon absorption followed by free carrier absorption. ZnO-Ag is a potential nanocomposite material for the UV light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.

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Luminescence enhancement of rhodamine 6G in sol-gel films containing silver aggregates

Cited by 80 publications

References 14 publications

Sol-Gel Optics: Proceedings SPIE-The International Society for Optical Engineering Held in San Diego, California on 11-13 July 1990. Volume 1328

Sol-Gel Optics: Proceedings SPIE-The International Society for Optical Engineering Held in San Diego, California on 11-13 July 1990. Volume 1328

Synthesis of Ag-colloids in sol-gel derived SiO2-coatings on glass

Spectral and nonlinear optical characteristics of nanocomposites of ZnO–Ag

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