Production of light from sol-gel derived thin films made...

C - Chemistry – Metallurgy – 09 – K

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C09K 11/08 (2006.01) H01L 21/00 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2650213

A method of preparing a lanthanide-doped nanoparticle sol-gel matrix film having a high signal to noise ratio is provided. The sol-gels are also provided. A method of preparing light emitting sol-gel films made with lanthanide doped nanoparticles, for the production of white light is also provided. The method comprises selecting lanthanides for the production of at least one of green, red and blue light when excited with near infrared light, preparing nanoparticles comprising the selected lanthanides, stabilizing the nanoparticles with ligands operative to stabilize the nanoparticles in an aqueous solution and selected to be substantially removed from the sol-gel matrix film during synthesis, incorporating the stabilized nanoparticles into a sol-gel matrix and heating to increase the signal to noise ratio of the luminescence by substantially removing the low molecular weight organic molecules. Additionally, light emitting sol-gel films made with lanthanide doped nanoparticles are provided.

L~invention concerne un procédé de préparation d~un film matriciel sol-gel composé de nanoparticules dopées aux lanthanides offrant un rapport signal-bruit élevé. Les sol-gels sont également prévus ainsi qu~un procédé de préparation de films sol-gel électromuninescents composés de nanoparticules dopées aux lanthanides pour la production de lumière blanche. Le procédé consiste à sélectionner des lanthanides pour la production d~au moins un de couleur verte, rouge et bleue par le biais d~une excitation avec une lumière infrarouge proche, à préparer des nanoparticules comprenant des lanthanides sélectionnés et à stabiliser les nanoparticules avec un opérateur contenant des ligands pour stabiliser les nanoparticules dans une solution aqueuse. Les lanthanides sont sélectionnés pour être sensiblement retirés du film matriciel sol-gel pendant la synthèse. Le procédé consiste en outre à incorporer les nanoparticules stabilisées dans une matrice sol-gel et à chauffer pour augmenter le rapport signal-bruit de la luminescence en retirant sensiblement les molécules ayant un faible poids organique moléculaire. De plus sont prévus des films sol-gel électromuninescents composés de nanoparticules dopées aux lanthanides.

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