Tsis ntev los no, Asmeskas Lub Tsev Haujlwm Saib Xyuas Hluav Taws Xob (DOE) ntawm Argonne National Laboratory hauv Lemont, Illinois coj kev txhim kho cov khoom siv tseem ceeb LED.
Cov kws tshawb fawb ntawm pab pawg tshawb fawb hloov kho tau hais tias:&"LEDs muaj txiaj ntsig zoo, tso cua sov tsawg dua, thiab nyob ntev."" Cov kws tshawb fawb tab tom kawm cov ntaub ntawv tshiab los ua LEDs kom muaj txiaj ntsig thiab lub neej ntev dua, thiab siv lawv rau cov khoom siv hluav taws xob, tshuaj, thiab Kev Ruaj Ntseg."
Cov kws tshawb fawb thiab koom tes los ntawm Brookhaven National Laboratory, Los Alamos National Laboratory, thiab SLAC National Accelerator Laboratory qhia tias lawv tau npaj ruaj khov perovskite nanocrystals rau cov LED no.
& quot; Xwm Photonics" luam tawm ib daim ntawv piav qhia txog kev ua haujlwm ntawm pab pawg." Peb cov kev tshawb fawb qhia pom tias txoj kev no tso cai rau peb txhim kho qhov ci ci thiab ruaj khov ntawm luminescent nanocrystals,&" hais qhia Xuedan Ma, tus kws tshawb fawb ntawm Argonne Nanomaterials Center.
Perovskite nanocrystals yog cov neeg sib tw tseem ceeb rau hom tshiab ntawm cov khoom siv LED. Tab sis ntev heev, nws 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 organic moj khaum (MOF).
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, txawm tias siv tshuaj, ntsuas kev nyab xeeb, thiab tshawb fawb. Tshawb nrhiav tus kheej siv lub tshuab xoo hluav taws xob.
& quot; Peb daws teeb meem kev ruaj ntseg los ntawm kev ntim cov khoom perovskite hauv MOF cov qauv,&" hais tias tus kws tshawb fawb ntawm Argonne Center for Nanomaterials (CNM), Chaw Haujlwm ntawm Asmeskas Lub Tsev Haujlwm Saib Xyuas Kev Siv Hluav Taws Xob' Chaw Haujlwm ntawm Cov Neeg Siv Khoom Siv Kev Tshawb Fawb." Peb cov kev tshawb fawb pom tias cov txheej txheem no tuaj yeem pab txhim kho qhov ci ci thiab ruaj khov ntawm luminescent nanocrystals."
& quot; Lub tswv yim kev ua haujlwm ntawm kev sib txuas ua ke perovskite nanocrystals hauv MOF tau ua pov thawj hauv daim ntawv hmoov, tab sis qhov no yog thawj zaug peb tau ua tiav nws ua tiav rau hauv cov pa tawm 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, poob qhov zoo ntawm nanocrystals thiab ua rau lawv tsis muaj peev xwm ua tau zoo LEDs.
Qhov teeb meem loj feem ntau suav nrog ntau lab ntawm cov 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 cov nanocrystals hauv qhov sib piv ntawm MOF, uas lawv tau piav raws li&"; zoo li pob ntaus pob tesniv raug ntes los ntawm cov hlua hlau." 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 kom sib sau ua ke nanocrystals nyob ib ncig ntawm cov hlau lead hauv cov lej.
Lub matrix khaws cov nanocrystals sib cais, yog li lawv 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, ntxiv rau qhov sib txawv ntawm txhua lub teeb.
Wani Nie, tus kws tshawb fawb ntawm Center for Integrated Nanotechnology ntawm Los Alamos National Laboratory, tau hais tias: "Hauv txoj haujlwm no, peb tau pom thawj zaug tias perovskite nanocrystals uas ruaj khov hauv MOF yuav tsim cov xim ci thiab ruaj khov ntawm ntau yam xim. LED."" Peb tuaj yeem tsim cov xim sib txawv, txhim kho xim dawb, thiab nce photoluminescence quantum tawm los. Qhov no yog ntsuas qhov muaj peev xwm luminous ntawm cov khoom siv."
Pab pawg tshawb fawb tau siv lub peev txheej photon qib siab (APS) rau 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 kev txav ntawm cov nqi hluav taws xob los ntawm cov khoom thiab nkag siab cov ntaub ntawv tseem ceeb uas tshwm sim thaum lub teeb tawm.
