{"id":10479,"date":"2016-12-27T10:31:11","date_gmt":"2016-12-27T03:31:11","guid":{"rendered":"http:\/\/www.nanotec.or.th\/en\/?p=10479"},"modified":"2016-12-27T10:31:11","modified_gmt":"2016-12-27T03:31:11","slug":"engineered-quantum-dots-convert-low-intensity-ir-light-into-visible-light","status":"publish","type":"post","link":"https:\/\/www.nanotec.or.th\/th\/engineered-quantum-dots-convert-low-intensity-ir-light-into-visible-light\/","title":{"rendered":"Engineered quantum dots convert low-intensity IR light into visible light"},"content":{"rendered":"<p class=\"standfirst\">Auger up-conversion processes can allow photovoltaic devices to harvest low-energy solar photons that are not normally absorbed. A team of researchers from the Los Alamos Laboratory in New Mexico in the US has now demonstrated such a process in thick-shell lead selenide\/cadmium selenide semiconducting quantum dots in which two low-energy, core-based excitons (electron-hole pairs) are converted into a single, higher-energy shell-based exciton. Devices made from such nanostructures could efficiently up-convert light at infrared wavelengths that has an intensity as low as a few watts per square centimetre&#8230;&#8230;&#8230;<\/p>\n<p>http:\/\/nanotechweb.org\/cws\/article\/tech\/67331<\/p>\n<div class=\"articleBody\">\n<div class=\"articleThumbnailLeft\"><a class=\"thickbox\" title=\" (a) In nonlinear or true 2PA, an electron is promoted from an initial state (solid black line labelled as |0\u27e9) to a final state (solid black line labeled as |2\u27e9 state) via a virtual intermediate state (dashed black line denoted as |1\u27e9) by simultaneously absorbing two photons (red wavy arrows). This process involves two virtual transitions (dashed red arrows) that generate electrons in a high- energy final state. (b) Stepwise 2PA involves a real intermediate state and two real optical transitions (solid red lines): one couples the initial to the intermediate state and the other the intermediate to the final state. In this process. (c) In Auger up-conversion, two electrons are excited into the intermediate state &lt;i&gt;via&lt;\/i&gt; sequential absorption of two photons. A Coulomb interaction between the electrons (dashed red arc arrow) triggers an Auger process whereby one electron is promoted into the final state while the other returns to the initial state. Courtesy: &lt;i&gt;ACS Nano&lt;\/i&gt;\" href=\"http:\/\/images.iop.org\/objects\/ntw\/news\/15\/12\/19\/pic1.jpg\"><img decoding=\"async\" title=\"Comparing three different up-conversion mechanisms\" src=\"http:\/\/images.iop.org\/objects\/ntw\/news\/thumb\/15\/12\/19\/pic1.jpeg\" alt=\"Comparing three different up-conversion mechanisms\" \/><\/a><br \/>\n<a class=\"thickbox\" title=\" (a) In nonlinear or true 2PA, an electron is promoted from an initial state (solid black line labelled as |0\u27e9) to a final state (solid black line labeled as |2\u27e9 state) via a virtual intermediate state (dashed black line denoted as |1\u27e9) by simultaneously absorbing two photons (red wavy arrows). This process involves two virtual transitions (dashed red arrows) that generate electrons in a high- energy final state. (b) Stepwise 2PA involves a real intermediate state and two real optical transitions (solid red lines): one couples the initial to the intermediate state and the other the intermediate to the final state. In this process. (c) In Auger up-conversion, two electrons are excited into the intermediate state &lt;i&gt;via&lt;\/i&gt; sequential absorption of two photons. A Coulomb interaction between the electrons (dashed red arc arrow) triggers an Auger process whereby one electron is promoted into the final state while the other returns to the initial state. Courtesy: &lt;i&gt;ACS Nano&lt;\/i&gt;\" href=\"http:\/\/images.iop.org\/objects\/ntw\/news\/15\/12\/19\/pic1.jpg\">Comparing three different up-conversion mechanisms<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Auger up-conversion processes can allow photovoltaic devices to harvest low-energy solar photons that are not normally absorbed. A team of [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[34,8],"tags":[],"class_list":["post-10479","post","type-post","status-publish","format-standard","hentry","category-technology-transfer","category-uncategorized-th"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Engineered quantum dots convert low-intensity IR light into visible light - \u0e28\u0e39\u0e19\u0e22\u0e4c\u0e19\u0e32\u0e42\u0e19\u0e40\u0e17\u0e04\u0e42\u0e19\u0e42\u0e25\u0e22\u0e35\u0e41\u0e2b\u0e48\u0e07\u0e0a\u0e32\u0e15\u0e34<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nanotec.or.th\/th\/engineered-quantum-dots-convert-low-intensity-ir-light-into-visible-light\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Engineered quantum dots convert low-intensity IR light into visible light - \u0e28\u0e39\u0e19\u0e22\u0e4c\u0e19\u0e32\u0e42\u0e19\u0e40\u0e17\u0e04\u0e42\u0e19\u0e42\u0e25\u0e22\u0e35\u0e41\u0e2b\u0e48\u0e07\u0e0a\u0e32\u0e15\u0e34\" \/>\n<meta property=\"og:description\" content=\"Auger up-conversion processes can allow photovoltaic devices to harvest low-energy solar photons that are not normally absorbed. 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