{"id":726,"date":"2020-04-16T12:05:42","date_gmt":"2020-04-16T06:35:42","guid":{"rendered":"http:\/\/www.potentialloops.org\/?p=726"},"modified":"2020-04-16T12:05:44","modified_gmt":"2020-04-16T06:35:44","slug":"ultraviolet-leds-prove-effective-in-eliminating-coronavirus-from-surfaces-and-potentially-air-and-water","status":"publish","type":"post","link":"https:\/\/www.potentialloops.org\/?p=726","title":{"rendered":"Ultraviolet LEDs prove effective in eliminating coronavirus from surfaces and, potentially, air and water"},"content":{"rendered":"\n

Date: April 14, 2020 <\/p>\n\n\n\n

Source 1: University of California – Santa Barbara <\/p>\n\n\n\n

Source 2: www.sciencedaily.com<\/a><\/p>\n\n\n\n

Summary: Researchers are developing ultraviolet LEDs that have the ability to decontaminate surfaces — and potentially air and water — that have come in contact with the SARS-CoV-2 virus. <\/p>\n\n\n\n

\"\"
Source: Google Images<\/figcaption><\/figure>\n\n\n\n

As COVID-19 continues to ravage global populations, the world is singularly focused on finding ways to battle the novel coronavirus. That includes the UC Santa Barbara’s Solid State Lighting & Energy Electronics Center (SSLEEC) and member companies. Researchers there are developing ultraviolet LEDs that have the ability to decontaminate surfaces — and potentially air and water — that have come in contact with the SARS-CoV-2 virus. <\/h3>\n\n\n\n

“One major application is in medical situations — the disinfection \nof personal protective equipment, surfaces, floors, within the HVAC \nsystems, et cetera,” said materials doctoral researcher Christian \nZollner, whose work centers on advancing deep ultraviolet light LED \ntechnology for sanitation and purification purposes. He added that a \nsmall market already exists for UV-C disinfection products in medical \ncontexts.<\/p>\n\n\n\n

Indeed, much attention of late has turned to the power of ultraviolet\n light to inactivate the novel coronavirus. As a technology, ultraviolet\n light disinfection has been around for a while. And while practical, \nlarge-scale efficacy against the spread of SARS-CoV-2 has yet to be \nshown. UV light shows a lot of promise: SSLEEC member company Seoul \nSemiconductor in early April reported a “99.9% sterilization of \ncoronavirus (COVID-19) in 30 seconds” with their UV LED products. Their \ntechnology currently is being adopted for automotive use, in UV LED \nlamps that sterilize the interior of unoccupied vehicles.<\/p>\n\n\n\n

It’s worth noting that not all UV wavelengths are alike. UV-A and \nUV-B — the types we get a lot of here on Earth courtesy of the Sun — \nhave important uses, but the rare UV-C is the ultraviolet light of \nchoice for purifying air and water and for inactivating microbes. These \ncan be generated only via human-made processes.<\/p>\n\n\n\n

“UV-C light in the 260 — 285 nm range most relevant for current \ndisinfection technologies is also harmful to human skin, so for now it \nis mostly used in applications where no one is present at the time of \ndisinfection,” Zollner said. In fact, the World Health Organization \nwarns against using ultraviolet disinfection lamps to sanitize hands or \nother areas of the skin — even brief exposure to UV-C light can cause \nburns and eye damage.<\/p>\n\n\n\n

Before the COVID-19 pandemic gained global momentum, materials \nscientists at SSLEEC were already at work advancing UV-C LED technology.\n This area of the electromagnetic spectrum is a relatively new frontier \nfor solid-state lighting; UV-C light is more commonly generated via \nmercury vapor lamps and, according to Zollner, “many technological \nadvances are needed for the UV LED to reach its potential in terms of \nefficiency, cost, reliability and lifetime.”<\/p>\n\n\n\n

In a letter published in the journal ACS Photonics<\/em>, the \nresearchers reported a more elegant method for fabricating high-quality \ndeep-ultraviolet (UV-C) LEDs that involves depositing a film of the \nsemiconductor alloy aluminum gallium nitride (AlGaN) on a substrate of \nsilicon carbide (SiC) — a departure from the more widely used sapphire \nsubstrate.<\/p>\n\n\n\n

According to Zollner, using silicon carbide as a substrate allows for\n more efficient and cost-effective growth of high-quality UV-C \nsemiconductor material than using sapphire. This, he explained, is due \nto how closely the materials’ atomic structures match up.<\/p>\n\n\n\n

“As a general rule of thumb, the more structurally similar (in terms \nof atomic crystal structure) the substrate and the film are to each \nother, the easier it is to achieve high material quality,” he said. The \nbetter the quality, the better the LED’s efficiency and performance. \nSapphire is dissimilar structurally, and producing material without \nflaws and misalignments often requires complicated additional steps. \nSilicon carbide is not a perfect match, Zollner said, but it enables a \nhigh quality without the need for costly, additional methods.<\/p>\n\n\n\n

In addition, silicon carbide is far less expensive than the “ideal” \naluminum nitride substrate, making it more mass production-friendly, \naccording to Zollner.<\/p>\n\n\n\n

Portable, fast-acting water disinfection was among the primary \napplications the researchers had in mind as they were developing their \nUV-C LED technology; the diodes’ durability, reliability and small form \nfactor would be a game changer in less developed areas of the world \nwhere clean water is not available.<\/p>\n\n\n\n

The emergence of the COVID-19 pandemic has added another dimension. \nAs the world races to find vaccines, therapies and cures for the \ndisease, disinfection, decontamination and isolation are the few weapons\n we have to defend ourselves, and the solutions will need to be deployed\n worldwide. In addition to UV-C for water sanitation purposes, UV-C \nlight could be integrated into systems that turn on when no one is \npresent, Zollner said.<\/p>\n\n\n\n

“This would provide a low-cost, chemical-free and convenient way to \nsanitize public, retail, personal and medical spaces,” he said.<\/p>\n\n\n\n

For the moment, however, it’s a game of patience, as Zollner and \ncolleagues wait out the pandemic. Research at UC Santa Barbara has \nslowed to a trickle to minimize person-to-person contact.<\/p>\n\n\n\n

“Our next steps, once research activities resume at UCSB, is to \ncontinue our work on improving our AlGaN\/SiC platform to hopefully \nproduce the world’s most efficient UV-C light emitters,” he said.<\/p>\n\n\n\n

Other research contributors include Burhan K. SaifAddin (lead author), Shuji Nakamura, Steven P. DenBaars, James S. Speck, Abdullah S. Almogbel, Bastien Bonef, Michael Iza, and Feng Wu, all from SSLEEC and\/or the Department of Materials at UC Santa Barbara.<\/p>\n\n\n\n

Story Source:<\/strong><\/p>\n\n\n\n

Materials<\/a> provided by University of California – Santa Barbara<\/strong><\/a>. Original written by Sonia Fernandez. Note: Content may be edited for style and length.<\/em><\/p>\n\n\n\n

www.sciencedaily.com<\/p>\n\n\n\n

\n\n\n\n

Journal Reference<\/strong>:<\/p>\n\n\n\n

  1. Burhan K. SaifAddin, Abdullah S. Almogbel, Christian J. Zollner, \nFeng Wu, Bastien Bonef, Michael Iza, Shuji Nakamura, Steven P. DenBaars,\n James S. Speck. AlGaN Deep-Ultraviolet Light-Emitting Diodes Grown on SiC Substrates<\/strong>. ACS Photonics<\/em>, 2020; 7 (3): 554 DOI: 10.1021\/acsphotonics.9b00600<\/a>\n<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"

    Date: April 14, 2020 Source 1: University of California – Santa Barbara Source 2: www.sciencedaily.com Summary: Researchers are developing ultraviolet LEDs that have the ability to decontaminate surfaces — and potentially air and water — that have come in contact with the SARS-CoV-2 virus. As COVID-19 continues to ravage global populations, the world is singularly […]<\/p>\n","protected":false},"author":1,"featured_media":727,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":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-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":"","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-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":"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":""},"mobile":{"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":""}},"footnotes":""},"categories":[35],"tags":[],"class_list":["post-726","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-coronavirus"],"aioseo_notices":[],"yoast_head":"\nUltraviolet LEDs prove effective in eliminating coronavirus from surfaces and, potentially, air and water -<\/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.potentialloops.org\/?p=726\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ultraviolet LEDs prove effective in eliminating coronavirus from surfaces and, potentially, air and water -\" \/>\n<meta property=\"og:description\" content=\"Date: April 14, 2020 Source 1: University of California – Santa Barbara Source 2: www.sciencedaily.com Summary: Researchers are developing ultraviolet LEDs that have the ability to decontaminate surfaces — and potentially air and water — that have come in contact with the SARS-CoV-2 virus. 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