{"id":3764,"date":"2019-02-08T08:55:00","date_gmt":"2019-02-08T16:55:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/stories\/usc-dornsife-chemists-find-a-cheaper-way-to-light-up-led-screens\/"},"modified":"2023-06-23T15:02:17","modified_gmt":"2023-06-23T22:02:17","slug":"scientists-find-cheaper-smartphone-technology","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/scientists-find-cheaper-smartphone-technology\/","title":{"rendered":"USC Dornsife chemists find a cheaper way to light up LED screens"},"content":{"rendered":"\n\n\n    \n                                \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-2947-768x432.jpg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-2947-768x432.jpg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"USC Dornsife chemists find a cheaper way to light up LED screens\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  New organic LED technology uses copper instead of expensive and increasingly rare iridium to produce blue light on smartphone and TV screens.\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=sustainability\">Sustainability<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>USC Dornsife chemists find a cheaper way to light up LED screens<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  Iridium has been generating light and color for organic LED screens on smartphones and TVs, but it is the rarest metal on Earth. USC Dornsife scientists find a way to make copper work. <strong>[3 min read]<\/strong>\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@dornsife.usc.edu\">Emily Gersema<\/a><\/strong>\n    \n          <span class=\"post-date-field\">February 8, 2019<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span class=\"title\">\n        Share\n      <\/span>\n                        <a class=\"a2a_button_copy_link\" target=\"_blank\" href=\"\/#copy_link\" rel=\"nofollow noopener\" title=\"Link\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_copy_link\">\n              <svg height=\"19\" 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cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>USC Dornsife chemists have found a cheaper way to light up smartphone and TV screens, which could save manufacturers and consumers money without affecting visual quality.<\/p>\n<p>Copper is the answer, according to their study, published Feb. 8 in the journal <i>Science<\/i>.<\/p>\n<p>\u201cThe current technology that is in every Samsung Galaxy phone, high-end Apple iPhone and LG TV relies on iridium compounds for the colors and light on organic LED screens,\u201d says <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/1932\/thompson-hailed-as-innovator\/\">Mark Thompson<\/a>, a chemist at USC Dornsife College of Letters, Arts and Sciences and the Ray. R. Irani Chairman of the Occidental Petroleum Corporation Chair in Chemistry.<\/p>\n<p>\u201cWe have been using iridium because you get a highly efficient light emission, but it is the rarest naturally-occurring element on Earth,\u201d Thompson says. \u201cOne of our challenges has been to come up with an alternative that is more abundant.\u201d<\/p>\n<p>Prior attempts to generate a copper-based OLED failed. The copper complexes in those studies had weaker structures. The molecules were unstable, with shorter lifetimes than the iridium compounds.<\/p>\n<p><strong>Iridium\u2019s link to dinosaurs<\/strong><\/p>\n<p>Copper definitely solves that problem since it is a plentiful metal worldwide. Iridium, on the other hand, is found in only a few places \u2014 mostly South Africa and parts of Asia.<\/p>\n<p>The most widely-accepted hypothesis that explains iridium\u2019s scarcity and its origins is that it traveled here on a meteor \u2014 the same one that wiped out the dinosaurs 65 million years ago.<\/p>\n<p>Unless another meteor like that hits Earth, iridium will continue to dwindle in supply. Demand for it is only increasing as smartphones, TVs and other devices that feature LED screens gain popularity.<\/p>\n<p>OLEDs have come to replace LED LCD screens. In an OLED screen, each pixel generates light, while in the LCD screens, pixels are illuminated by an\u00a0LED\u00a0backlight.<\/p>\n<p><figure style=\"width: 225px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/sites\/7\/migration-uploads\/LEDsecond_225x350-2947.jpg\" alt=\"\" width=\"225\" height=\"350\" \/><figcaption class=\"wp-caption-text\">A copper-based organic LED invented by USC Dornsife\u2019s Mark Thompson and a team of chemists. (Photo courtesy of Mark Thompson.)<\/figcaption><\/figure><br \/>\n<strong>Blue chemistry<\/strong><\/p>\n<p>Besides its scarcity, iridium has another drawback for LED technology that has perplexed chemists for more than two decades: weaker molecules for generating blue light.<\/p>\n<p>When the molecules from the iridium compounds are excited, they generate two of the LED screen\u2019s primary colors \u2014 red and green \u2014 very efficiently, quickly, and in devices that give very long operational lifetimes, says Thompson. His lab engineered the <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/1649\/colorful-keys\/\">iridium-based red and green molecules<\/a>.<\/p>\n<p>The third required color, blue, has been the bane of OLED technology because blue emissive OLEDs have a short lifetime. Thompson explained that the bonds within the blue molecules tend to break down. Blue molecules also require more electricity to energize them. Since blue is among the primary colors for LED, its poor performance can affect colors that you see on a screen that contain any blue.<\/p>\n<p>Thompson\u2019s team appears to have solved that, too, with their new copper compound, a more rigid molecular complex than the prior, weaker types of copper compounds. The new compound\u2019s rate of light emission matches iridium\u2019s, so the energy is converted efficiently into light and color, the chemists found.<\/p>\n<p>\u201cOur paper lays out the basic design rules for obtaining iridium-like emission efficiencies out of copper, with colors ranging from blue to green and yellow,\u201d said Rasha Hamze, the study\u2019s lead author and a USC Dornsife Department of Chemistry alumna. \u201cAchieving efficient blue emission out of copper compounds opens up entirely new possibilities for tackling the problem of short lifetimes in blue devices.\u201d<\/p>\n<p>Hamze recently began working for Universal Display Corporation, which develops, manufactures and services OLED technologies.<\/p>\n<p>The team at USC Dornsife has submitted a patent application for their copper compound.<\/p>\n<p>Thompson says that next, he wants to see if these rigid copper compounds could also lead to the creation of more energy-efficient lighting.<\/p>\n<p><strong>About the study<\/strong><\/p>\n<p>Study co-authors include USC Dornsife chemists Jesse L. Peltier, Daniel Sylvinson, Moonchul Jung, Jose Cardenas, Ralf Haiges and Peter I. Djurovich, as well as University of California, San Diego researchers Michele Soleilhavoup, Rodolphe Jazzar and Guy Bertrand.<\/p>\n<p>The work was funded by the Universal Display Corporation, where Hamze now works, and National Science Foundation grants DGE-1650112 (for Peltier) and CHE-1661518.<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Iridium has been generating light and color for organic LED screens on smartphones and TVs, but it is the rarest metal on Earth. USC Dornsife scientists find a way to make copper work. <strong>[3 min read]<\/strong><\/p>\n","protected":false},"author":13,"featured_media":3767,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[15],"tags":[78,132,96],"class_list":["post-3764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sustainability","tag-chemistry","tag-energy","tag-natural-sciences"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>USC Dornsife chemists find a cheaper way to light up LED screens<\/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:\/\/dornsife.usc.edu\/news\/stories\/scientists-find-cheaper-smartphone-technology\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"USC Dornsife chemists find a cheaper way to light up LED screens\" \/>\n<meta property=\"og:description\" content=\"Iridium has been generating light and color for organic LED screens on smartphones and TVs, but it is the rarest metal on Earth. 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