Raws li kev tshaj tawm xov xwm txawv teb chaws, lub teeb ci-emitting diodes (LED) yog cov tsis muaj kev cia siab ntawm kev lag luam teeb pom kev zoo. Lawv ua haujlwm tau zoo, tso cua sov tsawg, thiab kav ntev. Tam sim no, cov kws tshawb fawb tab tom kawm cov khoom tshiab los ua LED daim ntawv thov rau cov neeg siv khoom siv hluav taws xob, tshuaj thiab kev nyab xeeb kom muaj txiaj ntsig zoo thiab ua neej nyob ntev dua.
Cov kws tshawb fawb los ntawm Asmeskas Lub Tsev Haujlwm Saib Xyuas Lub Zog (DOE) Argonne National Laboratory, Brookhaven National Laboratory, Los Alamos National Laboratory, thiab SLAC National Accelerator Laboratory qhia tias lawv tau npaj cov calcium uas ruaj khov rau hom LED Titanium ore nanocrystals. Cov koom haum tshawb fawb los ntawm Taiwan, Tuam Tshoj kuj tau pab txhawb rau qhov kev tshawb fawb no.
Perovskite yog ib yam khoom siv nrog cov qauv siv tshwj xeeb, uas muaj cov yam ntxwv ntawm kev nqus lub teeb thiab lub luminescence, thiab muaj txiaj ntsig zoo hauv cov txheej txheem txuag hluav taws xob, suav nrog cov hnub ci cell thiab ntau yam ntsuas.
Txawm hais tias perovskite nanocrystals yog tus neeg sib tw tseem ceeb rau hom tshiab ntawm cov khoom siv LED, lawv tau ua pov thawj tsis ruaj khov hauv kev sim. Pab pawg tshawb fawb tau ruaj khov nanocrystals hauv cov qauv ntxeem tau hu ua hlau txheej txheem, lossis MOF kom luv. Raws li cov khoom siv ntau hauv ntiaj teb thiab tsim tawm hauv chav sov, cov LEDs no ib hnub yuav pab tau TVs tus nqi qis thiab cov khoom siv hluav taws xob, nrog rau cov cuab yeej siv duab gamma zoo dua, thiab txawm tias tiv thaiv tus kheej rau kev kho mob, ntsuas kev nyab xeeb, thiab kev tshawb fawb. Xoo hluav taws xob ntsuas hluav taws xob.
& quot; Peb daws teeb meem kev ruaj ntseg los ntawm kev ntim cov khoom perovskite hauv MOF cov qauv,&" hais Xuedan Ma, tus kws tshawb fawb ntawm Center for Nanomaterials (CNM) hauv Argonne, DOE Cov Neeg Siv Khoom Siv Chaw Ua Haujlwm." Peb cov kev tshawb fawb qhia pom tias txoj hauv kev no ua rau Peb tuaj yeem txhim kho qhov ci ci thiab ruaj khov ntawm luminescent nanocrystals."
Hsinhan Tsai, yav dhau los JR Oppenheimer tus kws tshaj lij tom qab kawm tiav hauv Los Alamos University hauv Tebchaws Meskas, hais ntxiv: "Lub tswv yim nthuav ntawm kev sib txuas perovskite nanocrystals hauv MOF tau ua pov thawj hauv cov hmoov, tab sis qhov no yog thawj zaug uas peb tau ua tiav nws ua ke emitting txheej ntawm LED. ."
Kev sim yav dhau los los tsim cov nanocrystalline LEDs tau cuam tshuam los ntawm kev puas tsuaj ntawm nanocrystals rov qab mus rau qhov tsis xav tau ntim theem, uas ua rau lawv poob qhov zoo ntawm nanocrystals thiab ua rau lawv tsis muaj peev xwm ua tau raws li cov teeb pom kev zoo. Qhov teeb meem loj yog tsim los ntawm ntau lab ntawm atoms. Cov ntaub ntawv zoo li perovskites tau tsim los ntawm ob peb mus rau ob peb txhiab atoms hauv theem nanometer, yog li lawv coj txawv.
Hauv lawv txoj hauv kev tshiab, pab pawg tshawb fawb tau ruaj khov nanocrystals los ntawm kev tsim lawv hauv matrix ntawm MOF, ib yam li pob ntaus pob tesniv raug kaw los ntawm laj kab hlau thaiv. Lawv siv cov hlau lead hauv cov txheej txheem ua cov hlau ua ntej thiab cov ntsev halide ua cov khoom siv organic. Kev daws cov ntsev halide muaj methyl ammonium bromide, uas ua rau muaj kev cuam tshuam nrog cov hlau lead hauv lub moj khaum thiab sib sau ua ke nanocrystals nyob ib ncig ntawm cov hlau lead hauv matrix. Txij li cov lej khaws cov nanocrystals sib cais, lawv yuav tsis cuam tshuam thiab ua rau poob qis. Txoj kev no yog ua raws txheej txheej txheej txheej, uas yog pheej yig dua li cov txheej txheem nqus nqus dav rau kev tsim cov inorganic LEDs.
MOF ruaj khov LEDs tuaj yeem tsim lub teeb liab, xiav, thiab ntsuab thiab sib txawv ntawm txhua lub teeb.
Wanyi Nie, tus kws tshawb fawb ntawm Center for Integrated Nanotechnology ntawm Los Alamos National Laboratory, hais tias:" Hauv txoj haujlwm no, peb tau pom thawj zaug uas perovskite nanocrystals uas ruaj khov hauv MOF yuav tsim cov teeb ci thiab ruaj khov ntawm ntau yam xim . Peb tuaj yeem tsim cov xim sib txawv, txhim kho xim kom huv thiab nce photoluminescence quantum tawm los, uas yog ntsuas ntawm lub peev xwm luminous ntawm cov khoom."
Pab pawg tshawb fawb tau siv Advanced Photon Source (APS) -DOE' Lub Chaw Haujlwm Saib Xyuas Kev Tshawb Fawb Cov Neeg Siv Khoom hauv Argonne-los ua lub sijhawm daws teeb meem X-ray nqus nqus tsom iav, txheej txheem uas tso cai rau lawv tshawb pom kev hloov pauv hauv cov ntaub ntawv perovskite dhau sijhawm. Cov kws tshawb fawb tuaj yeem taug qab qhov txav ntawm cov nqi hluav taws xob hauv cov khoom thiab nkag siab cov ntaub ntawv tseem ceeb uas tshwm sim thaum lub teeb tawm.
& quot; Peb tsuas tuaj yeem ua tiav qhov no los ntawm kev siv lub zog X-ray mem tes thiab lub sijhawm tshwj xeeb ntawm APS,&" hais tias Xiaoyi Zhang, pab pawg thawj coj ntawm X-ray Science Department of Argonne." Peb tuaj yeem taug qab cov nqi them hauv cov pob zeb perovskite me me. s txoj hauj lwm."
Hauv kev sim ua kom muaj zog, cov khoom siv ua tau zoo nyob rau hauv ultraviolet hluav taws xob, cua sov thiab hluav taws xob tsis muaj kev puas tsuaj thiab poob ntawm nws lub teeb pom kev thiab kev ua kom pom kev zoo, uas yog qhov xwm txheej tseem ceeb rau kev siv xws li TV thiab hluav taws xob ntsuas.
