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L'équipe LEPO du SPEC a ainsi réalisé des couches de pérylène-diimide (PDI), un colorant aux propriétés optiques intéressantes. 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L'équipe LEPO du SPEC a ainsi réalisé des couches de pérylène-diimide (PDI), un colorant aux propriétés optiques intéressantes. 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</div></header> <main class="wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained"> <article class="wp-block-group alignwide article_principal is-layout-flow wp-block-group-is-layout-flow"> <header class="wp-block-group Zone_Entete_Post is-style-Groupe-Style-et-Fond-A has-base-background-color has-background is-layout-flow wp-block-group-is-layout-flow"> <div class="wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex"> <div class="wp-block-column is-vertically-aligned-center Visuel_Post has-global-padding is-layout-constrained wp-container-core-column-is-layout-1 wp-block-column-is-layout-constrained" style="padding-top:0;padding-right:0;padding-bottom:0;padding-left:0;flex-basis:25%"><figure style="aspect-ratio:auto;" class="aligncenter is-style-default wp-block-post-featured-image"><a href="https://iramis.cea.fr/2025/01/structure-et-proprietes-photonique-d-une-monocouche-de-perylenediimide-preparee-par-la-technique-de-langmuir-blodgett/" target="_self"><img width="300" height="90" src="https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1-300x90.jpg" class="attachment-medium size-medium wp-post-image" alt="Structure et propriétés photonique d’une monocouche de pérylène-diimide préparée par la technique de Langmuir-Blodgett" style="width:100%;height:100%;object-fit:contain;" decoding="async" srcset="https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1-300x90.jpg 300w, https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1-1024x308.jpg 1024w, https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1-768x231.jpg 768w, https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1.jpg 1774w" sizes="(max-width: 300px) 100vw, 300px"></a></figure></div> <div class="wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow"> <div class="wp-block-group Titre_Post has-global-padding is-layout-constrained wp-container-core-group-is-layout-12 wp-block-group-is-layout-constrained" style="padding-top:var(--wp--preset--spacing--30);padding-right:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)"><h1 class="wp-block-post-title">Structure et propriétés photonique d’une monocouche de pérylène-diimide préparée par la technique de Langmuir-Blodgett</h1></div> </div> </div> </header> <div class="wp-block-group has-base-background-color has-background is-layout-flow wp-block-group-is-layout-flow"> <div class="wp-block-columns Zone_Metas_et_Contenu is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex"> <div class="wp-block-column is-vertically-aligned-top Barre_Laterale Position_Fixe is-layout-flow wp-block-column-is-layout-flow" style="padding-left:0;flex-basis:25%"> <div class="wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-22 wp-block-group-is-layout-flex"> <aside class="wp-block-group BL_Bloc has-gris-clair-background-color has-background has-global-padding is-layout-constrained wp-block-group-is-layout-constrained" style="border-radius:0px;border-left-color:var(--wp--preset--color--primary)"></aside> <div class="wp-block-group BL_Bloc has-gris-clair-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-21 wp-block-group-is-layout-constrained" style="border-radius:0px;border-left-color:var(--wp--preset--color--primary);padding-top:var(--wp--preset--spacing--30);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)"> <aside class="wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained"><div class="wp-block-post-date"><time datetime="2025-01-29T09:08:42+01:00">29 janvier 2025</time></div> <div class="taxonomy-category PT_Affiche_Titre_Taxonomie is-style-un-par-ligne wp-block-post-terms"> <div class="Post_Terms__Titre_Taxonomie has-text-color has-poppins-font-family">Catégories</div> <a href="https://iramis.cea.fr/news/faits-marquants/" rel="tag">Faits marquants</a> </div> <div class="wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained"> <div style="height:10px" aria-hidden="true" class="wp-block-spacer"></div> <div class="wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-18 wp-block-group-is-layout-flex"><div class="wp-block-template-part"> <ul class="wp-block-social-links has-icon-color is-style-logos-only is-layout-flex wp-container-core-social-links-is-layout-1 wp-block-social-links-is-layout-flex" style="margin-top:0;margin-bottom:0"> <li style="color: #262626; " class="wp-social-link wp-social-link-facebook has-gris-fonce-color RS_Partage_Article wp-block-social-link"><a rel="noopener nofollow" 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is-layout-constrained wp-block-post-content-is-layout-constrained"> <div class="wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained"> <p style="padding-right:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--50)"><em>Le procédé Langmuir-Blodgett est une façon élégante d’obtenir des couches minces d’épaisseur monomoléculaire. L’équipe LEPO du SPEC a ainsi réalisé des couches de pérylène-diimide (PDI), un colorant aux propriétés optiques intéressantes. Ce type de molécule présente en effet une forte absorption lumineuse dans le visible, ce qui lui ouvre de multiples possibilités comme élément actif dans les procédés optoélectroniques ou pour le photovoltaïque.</em></p> <p style="padding-right:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--50)"><em>Par la présente étude, l’équipe du <a href="https://iramis.cea.fr/spec/lepo/" title="">SPEC/LEPO</a> fait le lien entre la structure de la couche ainsi préparée et ses propriétés optiques, lien indispensable pour développer de nouveaux matériaux photoniques aux propriétés ajustables.</em></p> </div> <hr class="wp-block-separator has-alpha-channel-opacity"> <p>Lorsque des molécules organiques, s’assemblent en phase condensée, elles acquièrent des propriétés optiques bien distinctes de celles observées pour la molécule individuelle ou en solution. Ces changements sont liés aux interactions intermoléculaires, fonction de la distance entre molécules et de leur orientation relative, qui modifient leurs niveaux d’énergie électroniques. L’organisation spatiale des molécules au sein du matériau joue ainsi un rôle crucial dans la détermination de ses propriétés optiques.</p> <p>Parmi ces molécules, les molécules de colorant pérylène-diimide (PDI) sont particulièrement étudiées en raison de leur absorption dans le visible, de leur forte photo-stabilité et de leur potentiel pour de nombreuses applications en photonique. Les molécules de PDI sont des molécules planes et allongées, et leur orientation par rapport à un substrat et la distance qui les sépare sont des paramètres clés à connaître pour bien comprendre leurs propriétés.</p> <p>Afin d’étudier l’influence de cette organisation moléculaire sur les propriétés optiques des PDI, l’équipe du <a href="https://iramis.cea.fr/spec/lepo/" title="">SPEC/LEPO</a> a élaboré des monocouches de ces molécules sur un substrat de verre en utilisant la technique de Langmuir-Blodgett. Cette méthode permet d’obtenir une couche monomoléculaire à la surface de l’eau, puis de transférer cette monocouche sur un support solide, ici du verre. Les molécules ainsi transférées peuvent alors présenter trois orientations : “à plat”, debout alignées sur leur longueur (“edge-on”) ou debout alignées verticalement (“head-on”) – Voir Figure 1.a.</p> <div class="wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained"> <figure class="wp-block-image aligncenter size-large is-resized"><img loading="lazy" decoding="async" width="1024" height="308" src="https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1-1024x308.jpg" alt="" class="wp-image-165944" style="width:695px;height:auto" srcset="https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1-1024x308.jpg 1024w, https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1-300x90.jpg 300w, https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1-768x231.jpg 768w, https://iramis.cea.fr/wp-content/uploads/2025/01/figure-1.jpg 1774w" sizes="auto, (max-width: 1024px) 100vw, 1024px"></figure> <p class="has-text-align-center">Figure 1. a) Les 3 orientations possibles des molécules de PDI sur une surface de verre. b) Après une excitation laser locale de la monocouche de PDI, la photoluminescence collectée par un objectif est enregistrée dans le plan focal. L’image obtenue (b) donne l’orientation du dipôle émetteur, liée à l’orientation de la molécule. c) Image simulée pour un dipôle unique parallèle à la surface. L’accord obtenu montre que l’orientation des molécules adsorbées est préférentiellement « edge on ».</p> </div> <p>Pour cette étude, différentes techniques optiques ont été combinées :</p> <ul class="wp-block-list"> <li style="margin-top:10px;margin-bottom:10px"> <strong>Micro-absorption :</strong> cette technique révèle la présence d’une bande d’absorption caractéristique d’une forte interaction π-π entre les molécules, ce qui suggère une forte interaction entre des molécules proches. Cette observation élimine une organisation « à plat ».</li> <li style="margin-top:10px;margin-bottom:10px"> <strong>Photoluminescence :</strong> Après une excitation lumineuse locale à 532 nm, une large bande d’émission (600- 850 nm) est observée. Une figure de la photoluminescence est enregistrée dans le plan focal d’un objectif collecteur. En comparant le motif de photoluminescence obtenu (Figure 1.b) pour cette monocouche de PDI au motif théorique calculé (Figure 1.b et c) il est possible de conclure que l’orientation préférentielle du dipôle émetteur, et donc de l’axe principal des molécules adsorbées est “edge-on”.</li> <li style="margin-top:10px;margin-bottom:10px"> <strong>Polarisabilité :</strong> des mesures d’absorption en fonction de l’angle d’incidence montrent que la polarisabilité des molécules est maximale selon la direction parallèle à la surface, ce qui confirme l’orientation “edge-on” des molécules.</li> </ul> <p>L’ensemble des résultats obtenus montrent de façon consistante que les propriétés optiques sont fonction de l’orientation des molécules de PDI dans une monocouche de Langmuir-Blodgett transférée sur une plaque de verre. Ce résultat ouvre de nouvelles perspectives pour la conception de matériaux photoniques aux propriétés ajustables, en jouant sur l’organisation moléculaire.</p> <p>Référence :</p> <p>N. Fabre, R. Trojanowicz, L. Moreaud, C. Fiorini-Debuisschert, S. Vassant, and F. Charra, <a href="https://doi.org/10.1021/acs.langmuir.3c02038" title=""><em>Langmuir</em> <strong><em>39</em> </strong>(50) (2023) 18252</a>.</p> <p>Contact CEA : <a href="https://iramis.cea.fr/spec/lepo/annuaire/?uidc=S0xONLUwMzAGAA" title="">Nicolas Fabre</a>, Université Paris-Saclay SPEC/LEPO – UMR CEA-CNRS.</p> <p></p> </div> <div style="font-style:italic;font-weight:500;" class="has-text-align-right Lien_Auteur_vers_Annuaire wp-block-post-author"><div class="wp-block-post-author__content"><p class="wp-block-post-author__name"><a href="https://iramis.cea.fr/annuaire/?uidc=S0xONLUwMzAGAA" target="_self">Nicolas FABRE</a></p></div></div> <div class="wp-block-template-part"></div> </div> </div> </div> </div> </article> </main> <footer class="wp-block-template-part"> <div class="wp-block-group is-style-default has-base-color has-gris-fonce-background-color has-text-color has-background has-link-color wp-elements-8ad35bdd9863d30c2ef17b28555c8ab0 has-global-padding is-layout-constrained 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