{"id":73953,"date":"2025-06-06T18:48:57","date_gmt":"2025-06-06T16:48:57","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=73953"},"modified":"2025-06-11T09:13:03","modified_gmt":"2025-06-11T07:13:03","slug":"quand-le-graphene-se-met-a-briller-sans-chauffer","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/newsletter\/quand-le-graphene-se-met-a-briller-sans-chauffer.html","title":{"rendered":"Quand le graph\u00e8ne se met \u00e0 briller sans chauffer"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mbqaem2b-b20fa22bc8c84b24128a98b5f83ee853\">\n#top .av-special-heading.av-mbqaem2b-b20fa22bc8c84b24128a98b5f83ee853{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-mbqaem2b-b20fa22bc8c84b24128a98b5f83ee853 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mbqaem2b-b20fa22bc8c84b24128a98b5f83ee853 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mbqaem2b-b20fa22bc8c84b24128a98b5f83ee853 av-special-heading-h1  avia-builder-el-0  el_before_av_hr  avia-builder-el-first'><h1 class='av-special-heading-tag'  itemprop=\"headline\"  >Quand le graph\u00e8ne se met \u00e0 briller, sans chauffer.<\/h1><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n<div  class='hr av-2wh9e3l-f6f25effe8c9cdb169898f7a544f1b5b hr-default  avia-builder-el-1  el_after_av_heading  el_before_av_one_third'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-2dfkgox-492b6f658dede1ae8e08e32f7113ad77\">\n@keyframes av_boxShadowEffect_av-2dfkgox-492b6f658dede1ae8e08e32f7113ad77-column {\n0%   { box-shadow:  0 0 0 0 #efefef; opacity: 1; }\n100% { box-shadow:  0 0 7px 0 #efefef; opacity: 1; }\n}\n.flex_column.av-2dfkgox-492b6f658dede1ae8e08e32f7113ad77{\nbox-shadow: 0 0 7px 0 #efefef;\npadding:15px 15px 15px 15px;\nbackground-color:#ffffff;\n}\n<\/style>\n<div  class='flex_column av-2dfkgox-492b6f658dede1ae8e08e32f7113ad77 av_one_third  avia-builder-el-2  el_after_av_hr  el_before_av_one_third  first flex_column_div shadow-not-animated'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mbqafqhu-2894db878a17dffc21ebf64e8729b591\">\n#top .av_textblock_section.av-mbqafqhu-2894db878a17dffc21ebf64e8729b591 .avia_textblock{\ntext-align:left;\n}\n<\/style>\n<section  class='av_textblock_section av-mbqafqhu-2894db878a17dffc21ebf64e8729b591'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div>\n<div>\n<div>\n<p>C\u2019est une r\u00e8gle que tout \u00e9tudiant en physique a apprise : \u201cles m\u00e9taux ne peuvent pas \u00eatre \u00e9lectroluminescents\u201d. Pourtant une \u00e9quipe de chercheurs qui associe plusieurs laboratoires dont l\u2019IEMN, vient de d\u00e9montrer que le graph\u00e8ne, mat\u00e9riau m\u00e9tallique, peut \u00e9mettre de la lumi\u00e8re sans chauffer, un comportement jusqu\u2019ici r\u00e9serv\u00e9 aux semi-conducteurs. Cette \u00e9lectroluminescence in\u00e9dite, observ\u00e9e dans l\u2019infrarouge, ouvre de nouvelles perspectives pour des sources lumineuses plus efficaces et miniaturis\u00e9es.<\/p>\n<\/div>\n<div>\n<p>L\u2019\u00e9lectroluminescence est la capacit\u00e9 \u00e0 produire de la lumi\u00e8re sous l\u2019effet d\u2019un courant \u00e9lectrique sans \u00e9chauffement notable, elle est au c\u0153ur de nombreuses technologies modernes, des \u00e9crans plats, aux diodes Laser. Pourtant, ce ph\u00e9nom\u00e8ne \u00e9tait jusqu\u2019\u00e0 pr\u00e9sent r\u00e9serv\u00e9 aux mat\u00e9riaux semi-conducteurs, et consid\u00e9r\u00e9 comme hors de port\u00e9e des m\u00e9taux.<\/p>\n<\/div>\n<div>\n<p>Dans un semi-conducteur, les \u00e9lectrons peuvent accumuler de l\u2019\u00e9nergie dans des \u00e9tats excit\u00e9s, s\u00e9par\u00e9s des \u00e9tats de repos par une bande interdite. C\u2019est cette accumulation qui permet l\u2019\u00e9mission de lumi\u00e8re \u00ab froide \u00bb, comme dans les diodes \u00e9lectroluminescentes (LED). Les m\u00e9taux, eux, n&rsquo;ont pas cette bande interdite : leurs \u00e9lectrons rel\u00e2chent tr\u00e8s vite leur \u00e9nergie sous forme de chaleur et de lumi\u00e8re incandescente, ce qui rend impossible l\u2019\u00e9lectroluminescence\u2026 du moins, jusqu\u2019\u00e0 aujourd\u2019hui.<\/p>\n<p>Le graph\u00e8ne, un mat\u00e9riau bidimensionnel constitu\u00e9 d\u2019une seule couche d\u2019atomes de carbone, met en \u00e9vidence une exception \u00e0 cette r\u00e8gle et peut lui aussi, sous certaines conditions, devenir \u00e9lectroluminescent. Cette d\u00e9couverte, publi\u00e9e dans la revue Nature, repose sur l\u2019utilisation de graph\u00e8ne de tr\u00e8s haute qualit\u00e9 encapsul\u00e9e dans du nitrure de bore hexagonal (hBN), qui permet de pr\u00e9server les propri\u00e9t\u00e9s \u00e9lectroniques hors du commun de ce mat\u00e9riau.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-7d81wh-4cf52abf94eba0774cf1b4992b02ffce\">\n@keyframes av_boxShadowEffect_av-7d81wh-4cf52abf94eba0774cf1b4992b02ffce-column {\n0%   { box-shadow:  0 0 0 0 #eaeaea; opacity: 1; }\n100% { box-shadow:  0 0 7px 0 #eaeaea; opacity: 1; }\n}\n.flex_column.av-7d81wh-4cf52abf94eba0774cf1b4992b02ffce{\nbox-shadow: 0 0 7px 0 #eaeaea;\npadding:10px 10px 10px 10px;\nbackground-color:#ffffff;\n}\n<\/style>\n<div  class='flex_column av-7d81wh-4cf52abf94eba0774cf1b4992b02ffce av_one_third  avia-builder-el-4  el_after_av_one_third  el_before_av_one_third  flex_column_div shadow-not-animated'     ><section  class='av_textblock_section av-mbqag0h1-b5c92c67b69f7ef7a29781515db0db58'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div>\n<div>\n<div><\/div>\n<div>\n<p>Le graph\u00e8ne est un semi-m\u00e9tal aux \u00e9lectrons ultramobiles, peu coupl\u00e9s \u00e0 leur environnement, qui peuvent atteindre des \u00e9tats \u00e9lectroniques tr\u00e8s loin de l\u2019\u00e9quilibre thermique. Dans ce r\u00e9gime extr\u00eame, nous avons observ\u00e9 une \u00e9mission de lumi\u00e8re infrarouge coh\u00e9rente avec une \u00e9lectroluminescence, et non une simple incandescence. Cela fait du graph\u00e8ne le tout premier \u00ab\u00a0m\u00e9tal\u00a0\u00bb \u00e9lectroluminescent connu.<\/p>\n<\/div>\n<div>\n<p>Au-del\u00e0 de l&rsquo;\u00e9mission lumineuse, ces travaux mettent en \u00e9vidence un autre ph\u00e9nom\u00e8ne : un transfert d&rsquo;\u00e9nergie radiatif particuli\u00e8rement efficace entre le graph\u00e8ne et son substrat. En effet, jusqu&rsquo;\u00e0 70 % de l&rsquo;\u00e9nergie dissip\u00e9e par le courant \u00e9lectrique est transf\u00e9r\u00e9e au substrat via des interactions \u00e9lectromagn\u00e9tiques, notamment par l&rsquo;excitation de phonon-polaritons hyperboliques dans le hBN.<\/p>\n<\/div>\n<div>\n<p>Ces quasi-particules, r\u00e9sultant du couplage entre photons et vibrations du r\u00e9seau cristallin, permettent un transfert d&rsquo;\u00e9nergie \u00e0 distance, sans conduction thermique et donc sans \u00e9chauffement.<\/p>\n<\/div>\n<div>\n<p>Cette d\u00e9couverte remet en question les limites traditionnelles de l&rsquo;\u00e9lectroluminescence et ouvre de nouvelles perspectives pour la conception de sources lumineuses dans l&rsquo;infrarouge, domaine crucial pour les t\u00e9l\u00e9communications et la d\u00e9tection. La capacit\u00e9 du graph\u00e8ne \u00e0 \u00e9mettre de la lumi\u00e8re sans \u00e9chauffement significatif pourrait \u00e9galement conduire \u00e0 des dispositifs opto\u00e9lectroniques plus efficaces et compacts avec des applications potentielles en nanophotonique ou pour des sources de lumi\u00e8re int\u00e9gr\u00e9es \u00e0 tr\u00e8s petite \u00e9chelle.<\/p>\n<\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<\/div><\/section><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-12z7zkx-e1299a9546c5eb254aabf4bf8bb1e4b5\">\n.flex_column.av-12z7zkx-e1299a9546c5eb254aabf4bf8bb1e4b5{\nbackground-color:#dddddd;\n}\n<\/style>\n<div  class='flex_column av-12z7zkx-e1299a9546c5eb254aabf4bf8bb1e4b5 av_one_third  avia-builder-el-6  el_after_av_one_third  el_before_av_one_half  flex_column_div'     ><section  class='av_textblock_section av-r3om2p-53d68b68dcb2a4dfa235d643fe2feaa5'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div id=\"attachment_73994\" style=\"width: 550px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/Design-sans-titre.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-73994\" class=\"wp-image-73994\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/Design-sans-titre.png\" alt=\"\" width=\"540\" height=\"540\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/Design-sans-titre.png 500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/Design-sans-titre-300x300.png 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/Design-sans-titre-80x80.png 80w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/Design-sans-titre-12x12.png 12w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/Design-sans-titre-36x36.png 36w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/06\/Design-sans-titre-180x180.png 180w\" sizes=\"auto, (max-width: 540px) 100vw, 540px\" \/><\/a><p id=\"caption-attachment-73994\" class=\"wp-caption-text\">Repr\u00e9sentation de l\u2019\u00e9lectroluminescence dans le graph\u00e8ne g\u00e9n\u00e9r\u00e9e par DALL\u00b7E @Cr\u00e9dit : Th\u00e8se d\u2019Aur\u00e9lien Schmitt (2023)<\/p><\/div>\n<div>\n<hr \/>\n<\/div>\n<div>\n<blockquote>\n<div>Ce travail est le r\u00e9sultat d\u2019une collaboration entre le <a href=\"https:\/\/www.lpens.ens.psl.eu\/\" target=\"_blank\" rel=\"noopener\">Laboratoire de Physique de l&rsquo;\u00c9cole normale sup\u00e9rieure (LPENS)<\/a>, <a href=\"https:\/\/www.institutoptique.fr\/\" target=\"_blank\" rel=\"noopener\">l\u2019Institut Langevin, l\u2019Institut d\u2019Optique de Palaiseau<\/a>, <a href=\"https:\/\/www.universite-lyon.fr\/comue-universite-de-lyon-site-academique-lyon-saint-etienne-791.kjsp\" target=\"_blank\" rel=\"noopener\">l\u2019Universit\u00e9 de Lyon<\/a> et de l\u2019<a href=\"https:\/\/www.groupe-insa.fr\/\" target=\"_blank\" rel=\"noopener\">INSA<\/a> et avec la participation de David Mele aujourd&rsquo;hui enseignant \u00e0 <a href=\"https:\/\/www.junia.com\/fr\/\" target=\"_blank\" rel=\"noopener\">JUNIA<\/a> et chercheur \u00e0 l&rsquo;IEMN, laboratoire \u00e9galement affili\u00e9 \u00e0 cette publication.<\/div>\n<\/blockquote>\n<\/div>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mbqcfppn-a2f6a7b71c2394ea3cd4b633354cb2c6\">\n@keyframes av_boxShadowEffect_av-mbqcfppn-a2f6a7b71c2394ea3cd4b633354cb2c6-column {\n0%   { box-shadow:  0 0 0 0 ; opacity: 1; }\n100% { box-shadow:  0 0 10px 0 ; opacity: 1; }\n}\n.flex_column.av-mbqcfppn-a2f6a7b71c2394ea3cd4b633354cb2c6{\nbackground-color:#f2f2f2;\n}\n<\/style>\n<div  class='flex_column av-mbqcfppn-a2f6a7b71c2394ea3cd4b633354cb2c6 av_one_half  avia-builder-el-8  el_after_av_one_third  el_before_av_one_half  first flex_column_div  column-top-margin'     ><section  class='av_textblock_section av-mbqcfcxb-e5e8764597273f521ab542d086a1a8ad'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div>\n<blockquote>\n<p><span style=\"text-decoration: underline;\">R\u00e9f\u00e9rence<\/span>:<\/p>\n<p>Electroluminescence and energy transfer mediated by hyperbolic polaritons, <a href=\"https:\/\/www.nature.com\/articles\/s41586-025-08627-6#auth-Loubnan-Abou_Hamdan-Aff1-Aff2\">Loubnan Abou-Hamdan<\/a> et al, Nature 639, 909 (2025) ;<\/p>\n<p><a href=\"https:\/\/doi.org\/10.1038\/s41586-025-08627-6\" target=\"_blank\" rel=\"noopener\">https:\/\/doi.org\/10.1038\/s41586-025-08627-6<\/a><\/p>\n<\/blockquote>\n<\/div>\n<div><\/div>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-2r69a9-40f33cd5e1f59b1815bc9ee1e0374d4d\">\n@keyframes av_boxShadowEffect_av-2r69a9-40f33cd5e1f59b1815bc9ee1e0374d4d-column {\n0%   { box-shadow:  0 0 0 0 #c9c9c9; opacity: 1; }\n100% { box-shadow:  0 0 10px 0 #c9c9c9; opacity: 1; }\n}\n.flex_column.av-2r69a9-40f33cd5e1f59b1815bc9ee1e0374d4d{\nbox-shadow: 0 0 10px 0 #c9c9c9;\nborder-radius:15px 15px 15px 15px;\nbackground-color:#f2f2f2;\n}\n<\/style>\n<div  class='flex_column av-2r69a9-40f33cd5e1f59b1815bc9ee1e0374d4d av_one_half  avia-builder-el-10  el_after_av_one_half  avia-builder-el-last  flex_column_div shadow-not-animated  column-top-margin'     ><section  class='av_textblock_section av-mbqcj3p8-f6fdd10e7545f9c47cd3fb670933c961'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><blockquote>\n<p><span style=\"text-decoration: underline;\">Contact:<\/span><\/p>\n<p>david.mele<a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/05\/arobase6.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-73335 alignnone\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/05\/arobase6.png\" alt=\"\" width=\"16\" height=\"14\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/05\/arobase6.png 16w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/05\/arobase6-14x12.png 14w\" sizes=\"auto, (max-width: 16px) 100vw, 16px\" \/><\/a>junia.com<\/p>\n<\/blockquote>\n<\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[297],"tags":[],"class_list":["post-73953","post","type-post","status-publish","format-standard","hentry","category-newsletter"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/73953","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=73953"}],"version-history":[{"count":21,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/73953\/revisions"}],"predecessor-version":[{"id":76472,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/73953\/revisions\/76472"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=73953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=73953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=73953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}