Transient bleaching of small lead sulfide colloids:  influence of surface properties

Nenadović, M. T.; Čomor, Mirjana I.; Vasić, Vesna; Mićić, O. I.

doi:10.1021/j100379a044

Cited by 167 publications

(113 citation statements)

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“…The value of α is smaller than that of bulk PbS (α = 0.5 meV K −1 ). [304] This difference is attributed to the atomic-like character of the dot energy levels and the strong quantum confinement of the exciton, whose Bohr radius (20 nm) [285,289] is considerably larger than the dot diameter (< 10 nm). [285] 3) The blue-shift and quenching of the dot emission are accompanied by a significant increase of the full width at half maximum, In order to understand the effect of the temperature on W, the mechanisms that can give rise to the broadening of the emission from an ensemble of dots have to be considered quantitatively.…”

Section: Optical Properties Of Pbs Quantum Dotsmentioning

confidence: 99%

Aqueous Near‐Infrared Fluorescent Composites Based on Apoferritin‐Encapsulated PbS Quantum Dots

et al. 2008

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Section: Optical Properties Of Pbs Quantum Dotsmentioning

confidence: 99%

Aqueous Near‐Infrared Fluorescent Composites Based on Apoferritin‐Encapsulated PbS Quantum Dots

et al. 2008

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“…This is due to the fact that small particles prevent scattering of light in the polymer matrix. One of the most interesting aspects of metal nanoparticles is that their optical properties depend strongly on the particle size and shape [79][80][81][82]. Noble metal particles are especially interesting because of their unusual optical properties which arise from their ability to support surface plasmon of conducting electrons, the frequency of which is not only determined by the nature of the metal but also by the particle size and shape [83][84][85].…”

Section: Incorporating Metal Nanoparticles In Various Matricesmentioning

confidence: 99%

Novel way of making high refractive index plastics; metal containing polymers for optical applications

et al. 2009

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Abstract:Plastics are being preferred in almost all possible applications of materials. Several new applications including optical devices are being developed using plastics replacing conventional materials like inorganic glass etc. For the optical applications, the most important properties of plastics essential for their desired performance include refractive index, Abbe number, optical clarity, etc. The biggest challenge in developing suitable materials for optical applications has always been to meet the criteria of high refractive index along with a high Abbe number. Normally, if the refractive index increases, the Abbe number automatically decreases. The researchers have tried several approaches to deal with this typical challenge without which it is not possible to develop novel optical plastics. Presently the most popularly known optical plastics includes polymers such as polymethacrylates, polyurethanes, polycarbonates, polystyrene and diethylene glycol bis allyl carbonate. The latest material of high refractive index plastics with a refractive index of 1.67 belongs to the polythiourethanes chemistry. Several approaches are being tried world over, to develop materials of high refractive index. One of the approaches being pursued for enhancement of refractive index of existing monomers pertain to the incorporation of metals or metal salts in the matrices. The other commonly tried but difficult to achieve approaches pertain to the preparation of nanoparticles or nanocomposites.

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“…Dans le cas d'un faible élargissement inhomogène de la transition excitonique, de fortes nonlinéarités sont prévues [5]. Des nanocristallites de PbS ont été fabriqués dans les verres [6], les polymères [7], en solution [8] ou par sol-gel [9]. La plupart des auteurs ont observé le décalage vers le bleu de la bande d'absorption, mais, à notre connaissance, il n'y a pas de valeurs publiées de l'indice de réfraction non linéaire.…”

Section: Introductionunclassified

Couches minces fabriquées par sol-gel pour des applications en optique non linéaire

Fick

Martucci

Guglielmi

1998

l'Optique Non Linéaire Et Ses Matériaux

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Résumé : Des couches minces de Si02-TiC>2 dopées avec des nanocristallites de PbS ont été fabriquées par sol-gel. La présence des nanocristallites a été mise en évidence par des spectres d'absorption et des clichés de MEB. L'indice de réfraction non linéaire a été mesuré par la technique des lignes noires non linéaires et le mélange à quatre ondes. Des valeurs de n 2 entre -10" 7 et -10"'° cm 2 /kW ont été obtenues en fonction du taux de dopage et de la durée des impulsions laser utilisées. Des effets de saturation de la non-linéarité ont été observés. Le temps de réponse de la non-linéarité mesuré est inférieur à 30 ps.

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Transient bleaching of small lead sulfide colloids: influence of surface properties

Cited by 167 publications

References 3 publications

Aqueous Near‐Infrared Fluorescent Composites Based on Apoferritin‐Encapsulated PbS Quantum Dots

Aqueous Near‐Infrared Fluorescent Composites Based on Apoferritin‐Encapsulated PbS Quantum Dots

Novel way of making high refractive index plastics; metal containing polymers for optical applications

Couches minces fabriquées par sol-gel pour des applications en optique non linéaire

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