Quantum dots thiab encapsulation
Raws li cov khoom siv nano tshiab, quantum dots (QDs) muaj qhov ua tau zoo heev vim nws qhov loj me.Cov duab ntawm cov khoom no yog spherical lossis quasi-spherical, thiab txoj kab uas hla ntawm nws nyob ntawm 2nm txog 20nm.QDs muaj ntau qhov zoo, xws li dav excitation spectrum, nqaim emission spectrum, loj Stokes txav, lub neej ntev fluorescent thiab biocompatibility zoo, tshwj xeeb tshaj yog cov emission spectrum ntawm QDs tuaj yeem npog tag nrho cov teeb pom kev zoo los ntawm kev hloov nws qhov loj.
Ntawm cov khoom QDs luminescent sib txawv, Ⅱ ~ Ⅵ QDs suav nrog CdSe tau siv rau cov ntawv thov dav vim lawv txoj kev loj hlob sai.Qhov ib nrab-ncej dav ntawm Ⅱ ~ Ⅵ QDs nyob ntawm 30nm mus rau 50nm, uas tuaj yeem qis dua 30nm hauv qhov tsim nyog synthesis, thiab fluorescence quantum yield ntawm lawv yuav luag txog 100%.Txawm li cas los xij, lub xub ntiag ntawm Cd txwv txoj kev loj hlob ntawm QDs.Lub Ⅲ ~ Ⅴ QDs uas tsis muaj Cd tau tsim loj heev, fluorescence quantum yield ntawm cov khoom no yog hais txog 70%.Qhov ib nrab-ncej dav ntawm lub teeb ntsuab InP / ZnS yog 40 ~ 50 nm, thiab lub teeb liab InP / ZnS yog li 55 nm.Cov cuab yeej ntawm cov khoom siv no yuav tsum tau txhim kho.Tsis ntev los no, ABX3 perovskites uas yuav tsum tsis txhob npog lub plhaub qauv tau nyiam heev.Lub emission wavelength ntawm lawv tuaj yeem hloov kho hauv qhov pom pom tau yooj yim.Lub fluorescence quantum tawm los ntawm perovskite yog ntau tshaj 90%, thiab ib nrab-ncej dav yog kwv yees li 15nm.Vim tias cov xim gamut ntawm QDs luminescent cov ntaub ntawv tuaj yeem mus txog 140% NTSC, cov ntaub ntawv zoo li no muaj kev siv zoo hauv cov khoom siv luminescent.Cov ntawv thov tseem ceeb suav nrog tias tsis tshua muaj lub ntiaj teb phosphor kom emit teeb uas muaj ntau xim thiab teeb pom kev zoo nyob rau hauv nyias-film electrodes.
QDs qhia tau hais tias lub teeb xim saturated vim yog cov khoom siv no tuaj yeem tau txais cov spectrum nrog txhua qhov nthwv dej ntev hauv thaj chaw teeb pom kev zoo, uas ib nrab qhov dav ntawm yoj ntev yog qis dua 20nm.QDs muaj ntau tus yam ntxwv, uas suav nrog cov xim hloov tau emitting, nqaim emission spectrum, siab fluorescence quantum yield.Lawv tuaj yeem siv los ua kom zoo dua qhov spectrum hauv LCD backlights thiab txhim kho cov xim nthuav tawm quab yuam thiab gamut ntawm LCD.
Encapsulation txoj kev ntawm QDs yog raws li nram no:
1) On-chip: cov tshuaj fluorescent hmoov yog hloov los ntawm QDs luminescent cov ntaub ntawv, uas yog lub ntsiab encapsulation txoj kev ntawm QDs nyob rau hauv lub teeb pom kev zoo teb.Qhov zoo ntawm qhov no ntawm nti yog ob peb yam khoom, thiab qhov tsis zoo yog cov ntaub ntawv yuav tsum muaj kev ruaj ntseg siab.
2) On-deg: tus qauv yog siv nyob rau hauv backlight.Cov yeeb yaj kiab kho qhov muag yog ua los ntawm QDs, uas yog saum LGP hauv BLU.Txawm li cas los xij, tus nqi siab ntawm thaj tsam loj ntawm cov yeeb yaj kiab kho qhov muag txwv qhov kev siv dav ntawm txoj kev no.
3) On-edge: QDs cov ntaub ntawv yog encapsulated rau sawb, thiab muab tso rau sab ntawm LED sawb thiab LGP.Txoj kev no txo cov teebmeem ntawm thermal thiab kho qhov muag hluav taws xob uas tshwm sim los ntawm xiav LED thiab QDs luminescent cov ntaub ntawv.Tsis tas li ntawd, kev siv cov khoom siv QDs kuj txo qis.
