Nyob rau hauv ib tsab ntawv luam tawm nyob rau hauv phau ntawv journal ACS Photonics, cov kws tshawb fawb tau tshaj tawm ib txoj hauv kev zoo nkauj dua rau kev tsim cov khoom siv hluav taws xob zoo sib sib zog nqus ultraviolet (UV-C) LEDs uas suav nrog kev tso ib zaj duab xis ntawm semiconductor alloy aluminium gallium nitride (AlGaN) ntawm lub substrate. silicon carbide (SiC) -- tawm mus los ntawm ntau siv sapphire substrate.
Raws li Zollner, siv silicon carbide ua lub substrate tso cai rau kev loj hlob zoo thiab raug nqi ntawm cov khoom siv zoo UV-C semiconductor dua li siv sapphire. Qhov no, nws tau piav qhia, yog vim li cas cov khoom siv atomic qauv sib phim.
"Raws li txoj cai ntawm tus ntiv tes xoo, qhov ntau yam zoo sib xws (nyob rau hauv cov nqe lus ntawm atomic crystal qauv) cov substrate thiab cov yeeb yaj kiab yog rau ib leeg, nws yooj yim dua kom ua tiav cov khoom zoo," nws hais. Qhov zoo dua qhov zoo, qhov zoo ntawm LED qhov kev ua tau zoo thiab kev ua haujlwm zoo. Sapphire yog qhov sib txawv ntawm cov qauv, thiab kev tsim cov khoom tsis muaj qhov tsis zoo thiab tsis zoo feem ntau yuav tsum muaj cov kauj ruam ntxiv nyuaj. Silicon carbide tsis yog qhov zoo tshaj plaws, Zollner tau hais, tab sis nws ua kom muaj txiaj ntsig zoo yam tsis tas yuav tsum tau siv nyiaj ntau, ntxiv txoj hauv kev.
Tsis tas li ntawd, silicon carbide tsis tshua kim tshaj qhov "zoo tagnrho" txhuas nitride substrate, ua rau nws ntau ntau-phooj ywg, raws li Zollner.
Portable, ceev ceev cov tshuaj tua kab mob yog ib qho ntawm cov kev siv tseem ceeb uas cov kws tshawb fawb muaj nyob rau hauv lub siab thaum lawv tab tom tsim lawv UV-C LED technology; lub diodes 'durability, kev cia siab rau thiab me me daim ntawv yuav yog ib qho kev ua si hloov nyob rau hauv tsawg tsim cheeb tsam ntawm lub ntiaj teb no uas tsis muaj dej huv.
Qhov tshwm sim ntawm COVID-19 kev sib kis tau ntxiv rau lwm qhov. Raws li lub ntiaj teb kev sib tw los nrhiav tshuaj tiv thaiv, kev kho mob thiab kev kho mob rau tus kab mob, tshuaj tua kab mob, kev tshem tawm thiab kev cais tawm yog ob peb yam riam phom uas peb yuav tsum tiv thaiv peb tus kheej, thiab cov kev daws teeb meem yuav tsum tau siv thoob ntiaj teb. Ntxiv rau UV-C rau dej huv lub hom phiaj, UV-C teeb tuaj yeem ua ke rau hauv cov tshuab uas tig rau thaum tsis muaj leej twg nyob, Zollner tau hais.
"Qhov no yuav muab tus nqi qis, tsis muaj tshuaj lom neeg thiab yooj yim rau kev ntxuav cov pej xeem, khw muag khoom, tus kheej thiab chaw kho mob," nws hais.
Txog tam sim no, txawm li cas los xij, nws yog kev ua siab ntev, raws li Zollner thiab cov npoj yaig tos tawm tus kabmob kis. Kev tshawb fawb ntawm UC Santa Barbara tau ua rau qeeb qeeb kom txo qis kev sib cuag ntawm ib tus neeg mus rau lwm tus.
"Peb cov kauj ruam tom ntej no, ib zaug kev tshawb fawb rov pib dua ntawm UCSB, yog los txuas ntxiv peb txoj haujlwm ntawm kev txhim kho peb lub AlGaN/SiC platform kom vam tias yuav tsim lub ntiaj teb cov txiaj ntsig UV-C lub teeb emitters," nws hais.
Lwm cov kws tshawb fawb muaj xws li Burhan K. SaifAddin (tus thawj coj sau), Shuji Nakamura, Steven P. DenBaars, James S. Speck, Abdullah S. Almogbel, Bastien Bonef, Michael Iza, thiab Feng Wu, tag nrho los ntawm SSLEEC thiab/los yog Lub Tsev Haujlwm Saib Xyuas Kev Ua Haujlwm. Cov ntaub ntawv ntawm UC Santa Barbara.
