Perovskite lub teeb-emitting diode (perovskite LED) yog lub cim tshiab ntawm lub teeb-emitting tshuab nrog lub peev xwm loj hauv cov zaub, teeb pom kev zoo, kev sib txuas lus thiab lwm yam.Perovskite LEDs muaj cov nqi tsim khoom tsawg thiab cov txiaj ntsig tseem ceeb: lawv muaj cov yam ntxwv ntawm lub teeb, nyias thiab yooj yim zoo ib yam li OLEDs, thiab kuj muaj cov xim zoo sib xws thiab cov spectral tunability rau III-V semiconductor LEDs.Tom qab tsuas yog ob peb xyoos ntawm txoj kev loj hlob, kev ua haujlwm ntawm perovskiteLEDsyog piv rau cov paub tab lub teeb-emitting technologies.
Perovskite LED ntaus ntawv qauv (sab laug sab laug);
Cov tshuaj formula ntawm bipolar molecular stabilizer SFB10 (hauv qab sab laug)
Kev sib raug zoo ntawm cov cuab yeej T50 lub neej thiab radiance (txoj cai duab)
Txawm li cas los xij, zoo ib yam li perovskite hnub ci hlwb, instability ntawm perovskite LEDs yog qhov kev sib tw loj tshaj plaws rau kev paub txog kev lag luam.Tam sim no, lub neej ntawm kev ua haujlwm siab perovskite LEDs feem ntau yog nyob ntawm qhov kev txiav txim ntawm 10-100 teev.Lub neej yuav tsum tau rau OLED technology nkag mus rau hauv industrialization yog tsawg kawg yog 10,000 teev.Muaj cov teeb meem tseem ceeb hauv cov kev taw qhia no vim tias perovskite semiconductors tuaj yeem ua rau tsis ruaj khov.Nws yog qhov zoo rauLED zaub.Nws cov qauv siv lead ua muaj cov khoom tseem ceeb ionic, thiab ions txav tau yooj yim nyob rau hauv daim ntawv thov hluav taws xob ntawm LED, ua rau cov khoom puas.
Tsis ntev los no, pab pawg ntawm xibfwb David Di thiab tus kws tshawb fawb Zhao Baodan los ntawm Lub Xeev Lub Chaw Haujlwm Tseem Ceeb ntawm Cov Khoom Siv Hluav Taws Xob Niaj Hnub No, Tsev Kawm Ntawv ntawm Optoelectronics, Zhejiang University thiab cov
Lub Chaw Tshawb Fawb Thoob Ntiaj Teb ntawm Advanced Photonics, Haining International Campus, tau ua qhov tseem ceeb hauv kev taw qhia no.Siv ib tug bipolar molecular stabilizer, lawv ua tiav ultra-ntev kev khiav hauj lwm lub neej nyob rau hauv perovskite LEDs uas ua tau raws li cov kev xav tau ntawm kev siv tswv yim.
"Cov LEDs perovskite no tau tsav los ntawm qhov tam sim no ntawm 5 mA / c㎡ rau 5 lub hlis sib law liag (3600 teev) uas tsis muaj qhov ci ntsa iab," David Dee hais.LED kev nkag siab.RauP1.56LED zaub.Cov cuab yeej no ruaj khov heev, thiab qee qhov kev sim uas tseem tab tom ua tau zoo li nyuaj ua kom tiav hauv ib xyoos lossis ntau dua.Txhawm rau kom tau txais cov ntaub ntawv hauv lub neej nyob rau hauv lub sijhawm sim tsim nyog, LED nrawm dua kev sim yuav tsum tau ua. "
Cov nyob ze-infrared perovskite LEDs nthuav tawm lub neej ua haujlwm ntev ntev.Piv txwv li, nrog qhov pib radiance ntawm 2.1 W sr-1 m-2 (tam sim no ntawm 3.2 mA / c㎡), qhov kwv yees lub cuab yeej T50 lub neej (lub sij hawm nws yuav siv sij hawm rau thawj zaug radiance txo mus rau 50%) yog 32675 teev ( 3.7 xyoo).Lub zog kho qhov muag muab los ntawm qhov ci ci no piv rau kev lag luam ntsuab OLED kev ua haujlwm ntawm lub siab ci ntawm 1000 cd / m2.Ntawm qhov qis dua ntawm 0.21 W sr-1 m-2 (1/10 ntawm qhov ci ci saum toj no) lossis tam sim no ntawm 0.7 mAc㎡, T50 lub neej kwv yees li 2.4 lab teev (kwv yees 270 xyoo).
"Peb ntseeg hais tias nws yog ib qho tsim nyog los ua qhov kev ntsuam xyuas lub neej ntawm LED tshiab no, uas peb tau sau 62 cov ntaub ntawv hauv lub neej cov ntaub ntawv hauv cov kev sim kev laus nrawm, npog qhov dav tshaj plaws tam sim no qhov ceev ntawm 10-200 mA / c㎡ ntau."Guo Bingbing tau hais.Lub electroluminescence sab nraud quantum efficiency (EQE) thiab lub zog hloov dua siab tshiab (ECE) ntawm lub cuab yeej mus txog 22.8% thiab 20.7%, feem, uas yog qhov ua tau zoo tshaj plaws ntawm ze-infrared perovskite LEDs.
Cov kws sau ntawv pom tias cov ntaub ntawv perovskite luminescent muaj cov qauv siv lead ua ruaj khov heev."Cov qauv siv lead ua ntawm cov khoom tsis tau hloov tom qab ntau tshaj 322 hnub," Zhao Baodan tau hais.
Lub sijhawm ua haujlwm ntev thiab ua kom muaj kev laus ntawm kev sim ntawm perovskite LEDs (sab laug duab);
Sab nraud quantum efficiency cov ntaub ntawv ntawm kev tswj thiab stabilized li (txoj cai vaj huam sib luag)
"Qhov no qhia tau hais tias lub bipolar molecular stabilizer pab lub perovskite tswj nws cov thawj siv lead ua theem nrog zoo heev optoelectronic zog. Cov qauv siv lead ua ntawm kev kho perovskite cov qauv hloov pauv loj thiab degraded nyob rau hauv ob lub lis piam."
Ion tsiv teb tsaws nyob rau hauv perovskites yog ib qho tseem ceeb uas ua rau tsis muaj kev ruaj ntseg, thiab qhov teeb meem no yuav hnyav dua nyob rau hauv lub zog ntawm kev siv voltage nyob rau hauv LEDs thiabMini LED zaub.Guo Bingbing tau hais tias "Peb qhov kev sim thiab kev xam pom tau pom tias cov molecules bipolar tsim cov tshuaj tiv thaiv kab mob lossis kev cuam tshuam nrog ions ntawm perovskite grain ciam teb," Guo Bingbing hais tias, "uas tej zaum yuav yog vim li cas vim li cas ion tsiv teb tsaws yuav nyuaj hauv peb cov perovskites." Cov kev sim hluav taws xob thiab kho qhov muag peb nqa. tawm nrog peb cov neeg koom tes tau qhia txog kev tawm tsam ntawm ion txav tshwm sim, "Zhao Baodan ntxiv.
Cov txiaj ntsig ntawm lub neej ntawm cov cuab yeej qhia tau hais tias cov ntaub ntawv perovskite tsis muaj "genetic defects" nyob rau hauv cov nqe lus ntawm stability."Tshiab semiconductors, xws li hlau halide perovskites, yog dav suav hais tias yog intrinsically tsis ruaj tsis khov, tshwj xeeb tshaj yog nyob rau hauv lub siab hluav taws xob teb, xws li nyob rau hauv LED daim ntaub ntawv," said David Dee."Peb cov txiaj ntsig tau pom tias ua tiav cov khoom siv perovskite ruaj khov tsis yog 'lub hom phiaj ua tsis tau'".
Cov cuab yeej siv ntev ntev yuav tsum txhawb kev ntseeg siab hauv thaj chaw perovskite LED, raws li nws tau ua tiav qhov kev xav tau ntawm kev ruaj ntseg rau kev lag luam OLEDs.Cov LEDs ze-infrared no tuaj yeem siv rau hauv cov ntawv thov xws li ze-infrared cov lus qhia, kev sib txuas lus, thiab biology.Txawm hais tias pom-lub teeb perovskite cov khoom siv nrog lub neej ntev zoo sib xws tseem yuav tsum tau tsim, kev ua tiav ntawm ultra-ruaj khov perovskite LEDs paves txoj kev rau perovskite luminescence technology nkag mus rau cov ntawv thov kev lag luam.
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Kev soj ntsuam ntawm ion migration nyhuv ntawm perovskite nyob rau hauv hluav taws xob teb los ntawm microfluorescence imaging kev sim
Post lub sij hawm: Aug-24-2022