Propriétés d'émission de luminophores incorporés au sein de cristaux photoniques colloïdaux d'architecture contrôlée

Abstract : During this work, we were interested in the elaboration of colloidal photonic crystals with a controlled architecture to study their effect on the photoluminescence spectra of emitters. Our strategy was to incorporate the emitters within the silica particles composing the colloidal crystals in order to distribute them homogeneously in the samples. We present the synthesis of the mineral precursors and the elaboration of colloidal crystals whose thickness is controlled at the layer level thanks to the Langmuir-Blodgett technique. These structures are characterized by a band gap which affects the light propagation. Insertion of a monolayer of particles with a different size as a planar defect within a colloidal crystal leads to the formation of a pass band in the band gap. We thus studied the effect of the structure of crystals with or without planar defect(s) on the emission spectra of different emitters. We observed local inhibition and exaltation of the emission in the spectral region corresponding to the stop band and the pass band, respectively. We have also observed reversible modulations of the photoluminescence spectra of the emitters when these ones were incorporated in colloidal crystals whose optical properties can be tuned by an external stimulus.
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Contributor : Jean-Francois Dechezelles <>
Submitted on : Tuesday, January 18, 2011 - 10:24:25 AM
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Jean-François Dechézelles. Propriétés d'émission de luminophores incorporés au sein de cristaux photoniques colloïdaux d'architecture contrôlée. Matériaux. Université Sciences et Technologies - Bordeaux I, 2009. Français. ⟨NNT : 2009BOR13960⟩. ⟨tel-00555684⟩

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