Quantum Dot Khoom thiab nws txoj kev ntim khoom
Dec 11, 2021
Quantum dots yog hom tshiab ntawm nanomaterial, feem ntau yog kheej kheej lossis quasi-spherical nrog txoj kab uas hla ntawm 2 thiab 20 nanometers. Vim qhov tshwj xeeb qhov loj me, nws muaj kev ua tau zoo sib txawv ntawm cov ntaub ntawv macroscopic. Qhov tseem ceeb tshaj plaws optical yam ntxwv ntawm quantum dots yog tias lawv emission spectrum tuaj yeem npog tag nrho thaj tsam pom lub teeb los ntawm kev hloov lawv qhov loj. Tsis tas li ntawd, ntau qhov zoo xws li qhov dav excitation spectrum, nqaim emission spectrum, loj Stokes hloov, ntev fluorescence lifetime, thiab zoo biocompatibility tau ua quantum dots ib qho kev tshawb fawb hotspot nyob rau hauv lub tshav pob ntawm luminescence.
Muaj ntau ntau hom quantum dot luminescent cov ntaub ntawv. Qhov thib ob rau Ⅵ quantum dots uas sawv cev los ntawm CdSe yog qhov kev tshawb fawb ntxov tshaj plaws thiab cov cuab yeej siv tau zoo tshaj plaws, thiab tam sim no yog cov khoom siv tshaj plaws. Qhov ib nrab-ncej dav ntawm cov khoom siv no yog nruab nrab ntawm 30 thiab 50 nm. Raws li kev tswj hwm ntawm cov txheej txheem synthesis zoo thiab cov qauv, ib nrab-ncej dav tuaj yeem tsawg dua 30 nm. Nyob rau tib lub sijhawm, tus nqi ntawm fluorescence ntawm cov khoom siv.
Lub quantum yield kuj maj mam nce, thiab nws yog ze rau 100%. Txawm li cas los xij, qhov tseem ceeb tshaj plaws txwv txoj kev loj hlob ntawm cov khoom siv no yog qhov muaj nyob ntawm Cd keeb. Ntawm Cd-dawb quantum dot cov ntaub ntawv, kev loj hlob ntawm pab pawg III ~ V quantum dots sawv cev los ntawm InP yog tus paub tab, thiab cov fluorescence quantum yield yog me ntsis qis, feem ntau txog 70%, InP quantum dots yog dav dua li CdSe quantum dots nyob rau hauv cov nqe lus. ntawm ib nrab-tus nqi dav ntawm lub ncov luminescence. Qhov ib nrab-tus nqi dav ntawm cov tub ntxhais-plhaub qauv ntsuab InP / ZnS quantum dots yog 40 ~ 50nm, thiab liab InP / ZnS quantum dots Lub ntsiab lus yog ~ 55nm, thiab kev ua haujlwm yuav tsum tau txhim kho. Tsis tas li ntawd, ABX3 hom perovskite quantum dot cov khoom uas tau tshwm sim nyob rau hauv ob xyoos dhau los tau nyiam cov xim zoo nkauj. Lub emission wavelength ntawm cov khoom tuaj yeem hloov kho tau yooj yim hauv thaj chaw pom lub teeb yam tsis tau npog cov qauv ntawm cov tub ntxhais-plhaub. Tom qab kev ua kom zoo, cov fluorescence quantum tawm los ntawm cov khoom tau tshaj 90%, thiab ib nrab-ncej dav yog tsawg li ~ 15nm, xam los ntawm kev simulation, xim gamut tus nqi ntawm cov khoom siv cov khoom siv quantum dot luminescent tuaj yeem ncav cuag 140%. NTSC, uas qhia cov peev txheej loj heev. Cov ntaub ntawv no tuaj yeem siv rau hauv cov khoom siv teeb pom kev zoo hauv ob hom: ib qho yog siv los ua cov txheej txheem hloov lub teeb hauv GaN-raws li LEDs, uas tuaj yeem nqus tau lub teeb xiav thiab tawm lub teeb ntawm ntau yam xim uas nws lub wavelength yog precisely adjustable nyob rau hauv lub pom. lub teeb ntau, uas yog los hloov lub ntiaj teb tsis tshua muaj tam sim no. Phosphorus; Qhov thib ob yog siv cov khoom electroluminescence ntawm quantum dot cov ntaub ntawv los npog lawv ntawm nyias zaj duab xis electrodes kom emit lub teeb.
Quantum dots yog siv nyob rau hauv lub teeb pom kev zoo, uas muaj peev xwm tau txais ib spectrum ntawm ib tug wavelength nyob rau hauv ib tug tej band, thiab ib nrab-dav ntawm lub emission lub teeb yog qis dua 20 nm, yog li nws muaj peev xwm nthuav tawm ntau saturated lub teeb xim. Cov khoom muaj cov yam ntxwv ntawm cov xim purity siab, adjustable luminescence xim, nqaim emission spectrum thiab siab fluorescence quantum tawm los, thiab yuav optimize lub spectral Cheebtsam nyob rau hauv lub LCD backlight, txhim kho cov xim qhia ntawm cov kua siv lead ua kua zaub, thiab ho txhim khu cov xim gamut. ntawm cov khoom siv tso saib.
Lub ntim ntawm quantum dots feem ntau muab faib ua peb hom hauv qab no:
1) Chip pob hom (on-chip). Hauv cov qauv no, cov khoom siv quantum dot luminescent hloov cov khoom siv phosphor tsoos thiab tau ntim rau hauv ib thaj xim xiav LED, uas tseem yog txoj kev ntim khoom tseem ceeb rau quantum dots siv rau hauv teeb pom kev zoo. Txoj kev no yog siv rau lub teeb pom kev zoo, thiab nws tseem yuav tsum tau welding qhov tau txais lub teeb dawb LED ntawm thaj rau LED teeb bar raws li qhov loj ntawm lub teeb pom kev zoo. Qhov kom zoo dua ntawm cov qauv no yog tias cov khoom siv quantum dot luminescent tsawg heev, uas txo tus nqi. Txawm li cas los xij, cov qauv no muaj kev xav tau siab heev ntawm kev ruaj ntseg ntawm cov khoom siv quantum dot.
2) Optical film integrated type (on-surface). Cov qauv no feem ntau haum rau backlighting. Cov yeeb yaj kiab kho qhov muag ua los ntawm cov khoom siv quantum dot luminescent yog siv rau lub teeb pom kev zoo nyob rau hauv daim ntawv ntawm cov chaw taws teeb ntim, thiab cov yeeb yaj kiab kho qhov muag ua los ntawm cov khoom siv quantum dot yog nyob ncaj qha saum lub teeb qhia phaj nyob rau hauv lub backlight module. Nyob rau hauv cov qauv no, qhov loj-chaw npaj nqi ntawm quantum dot optical zaj duab xis yog ib qho ntawm cov laj thawj tseem ceeb uas txwv nws daim ntawv thov loj.
3) Sab raj pob hom (ntawm ntug). Qhov no yog kev sib haum xeeb ntawm ob lub tsev saum toj no. Ua ntej, cov khoom siv quantum dot yog ntim rau hauv ib txoj hlua ntev, thiab tom qab ntawd muab tso rau ntawm sab ntawm lub teeb xiav LED thiab lub teeb qhia phaj. Ntawm ib sab, nws tuaj yeem txo cov hluav taws xob thermal thiab lub teeb hluav taws xob ntawm lub teeb xiav LED mus rau quantum dots. Kev cuam tshuam ntawm cov ntaub ntawv luminescent, ntawm qhov tod tes, kuj tuaj yeem txo qhov kev siv quantum dot luminescent cov ntaub ntawv hauv kev siv tswv yim.
