Cov pa hluav taws xob siv hluav taws xob feem ntau yog hom bracket, encapsulated hauv epoxy resin, nrog lub zog qis, thiab lub teeb hluav taws xob tag nrho tsis loj, thiab lub siab ci ci tsuas yog siv tau raws li qee qhov teeb pom kev zoo tshwj xeeb. Nrog txoj kev loj hlob ntawm LED nti thev naus laus zis thiab kev ntim tshuab, hauv kev teb rau qhov kev thov xav tau cov hluav taws xob ntau lub teeb pom kev zoo cov khoom lag luam hauv lub tshav puam teeb pom kev zoo, hwj huam LED tau maj mam nkag mus hauv khw. Lub zog hluav taws xob LED feem ntau muaj lub teeb tsa hluav taws xob tso rau ntawm lub pob hluav taws kub thaum tshav kub kub, thiab lub ntsej muag kho qhov muag tau muab sib dhos rau ntawm qhov ua tiav qee qhov kho qhov muag tau faib, thiab lub lens tau ntim nrog qhov tsis tshua muaj kev ntxhov siab silicone.
Fais fab LEDs tau nkag mus rau thaj teb ntawm kev teeb pom kev zoo kom ua tiav txhua hnub teeb pom kev hauv tsev. Tseem tshuav ntau yam teeb meem yuav tsum tau daws, qhov tseem ceeb tshaj plaws ntawm cov luminous efficiency. Tam sim no, qhov ua tau zoo tshaj plaws lumen tshaj tawm los ntawm lub hwj huam LED ntawm kev ua lag luam yog ib ncig ntawm 50 lm / W, uas nyob deb ntawm qhov yuav tsum tau ntawm lub teeb pom kev hauv tsev txhua hnub. Txhawm rau txhawm rau txhim kho lub teeb ci zoo ntawm lub zog LED, ntawm ib sab, qhov ua kom zoo ntawm cov hluav taws xob tso tawm hluav taws xob xav tau kev txhim kho; ntawm qhov tod tes, cov cuab yeej ntim khoom ntawm lub zog LED xav tau kev txhim kho ntxiv, pib los ntawm cov qauv tsim, cov khoom siv thev naus laus zis thiab txheej txheem thev naus laus zis, thiab txhim kho cov khoom lag luam. Pob lub teeb tawm efficiency.
Kev ntim cov ntsiab lus uas cuam tshuam rau lub teeb pom kev zoo
Thaum tshav kub kub dissipation tshuab
Rau lub teeb ci ua hluav taws xob ua ke ntawm PN kev sib tshuam, thaum lub zog tam sim no ntws los ntawm PN kev sib tshuam, PN kev sib tshuam muaj qhov kub ploj, uas tawg mus rau saum huab cua los ntawm kev sib khi kua nplaum, cov khoom siv potting, lub dab dej kub, thiab lwm yam ., Nyob hauv tus txheej txheem. Qee cov ntaub ntawv muaj cov thermal impedance uas thaiv cov cua sov, uas yog, thermal tiv thaiv, uas yog tus nqi uas txiav txim siab los ntawm qhov loj me, tus qauv, thiab cov khoom ntawm lub cuab yeej. Cia lub thermal tsis kam ntawm cov LED yog Rth (° C / W) thiab lub tshav kub dissipation zog yuav PD (W). Nyob rau lub sijhawm no, PN hlws ris kub nce vim qhov kub ntawm qhov tam sim no yog:
T (° C) = Rth × PD.
PN hlws ris kub yog:
TJ = TA + Rth × PD
Qhov twg TA yog qhov kub ntawm huab cua sov. Raws li qhov txiav taws kub nce, qhov tshwm sim ntawm PN hlaus luminescence recombination poob qis, thiab qhov ci ci ntawm LED poob. Nyob rau tib lub sijhawm, vim qhov nce ntawm qhov kub nce vim tias kub poob, lub ci ci ntawm LED yuav tsis txuas ntxiv mus ntxiv kom muaj kev sib luag nrog cov tam sim no, taw qhia txog kev kub siab saturation. Ib qho ntxiv, thaum lub hlws ris kub sawv, qhov kub siab kawg ntawm lub luminescence tseem yuav mus rau nthwv dej ntev, ntev txog 0.2-0.3 nm / ° C, uas yog rau lub LED dawb tau los ntawm kev sib xyaw YAG phosphor coated nrog xiav nti. Kev txav mus los ua ib qho tsis sib xws nrog kev zoo siab nthwv dej ntawm phosphor, yog li txo qhov kev txiav txim siab dav dav ntawm cov LED dawb thiab ua rau muaj kev hloov xim dawb xim kub.
Rau lub hwj chim LED, qhov tsav tsheb tam sim no feem ntau ntau pua milliamperes lossis ntau dua, thiab qhov ceev ntawm PN kev sib tshuam yog loj heev, yog li qhov kub nce ntawm PN kev sib tshuam yog pom tseeb heev. Rau kev ntim khoom thiab kev siv, yuav ua li cas txo cov thermal tiv thaiv ntawm cov khoom, kom cov cua sov ua los ntawm PN hlws ris tau ploj mus sai li sai tau, tsis tsuas yog tuaj yeem txhim kho qhov saturation tam sim no ntawm cov khoom, txhim kho qhov luminous efficiency ntawm cov khoom , tab sis kuj txhim kho txoj kev cia siab thiab lub neej ntawm cov khoom. Cov. Txhawm rau txo cov thermal tsis kam ntawm cov khoom, qhov kev xaiv ntawm cov ntaub ntim khoom yog qhov tshwj xeeb, nrog rau cov dab dej kub, cov nplaim nplaum, thiab lwm yam, cov thermal tsis kam ntawm txhua cov khoom siv yog tsawg, uas yog, thermal conductivity yuav tsum ua kom zoo. Thib ob, tus qauv tsim yuav tsum yog qhov tsim nyog, lub thermal conductivity ntawm cov khoom siv yuav tsum txuas ntxiv mus, thiab cov cua sov sib txuas ntawm cov khoom siv yog qhov zoo, zam lub tshav kub dissipation bottleneck nyob rau hauv lub tshav kub conduction channel thiab xyuas kom cov cua sov los ntawm sab hauv mus rau txheej sab nraud. Nyob rau tib lub sijhawm, nws yog qhov yuav tsum ua kom paub tseeb tias cov cua sov tau yaj nyob rau hauv lub sijhawm raws li cov qauv tsim ua ntej thaum tshav kub kub.
2. Sau xaiv kua nplaum
Raws li txoj cai ntawm kev rov ua haujlwm, thaum lub teeb pom kev los ntawm qhov nruab nrab ntawm qhov nruab nrab kom qhov nruab nrab ntawm lub teeb nruab nrab, thaum lub teeb meem lub kaum sab xis nce mus txog qee yam muaj nuj nqis, uas yog, ntau dua lossis sib luag ntawm lub kaum ntse ntse tseem ceeb, tag nrho cov pa tawm. Kev hais txog ntawm GaN xiav nti, qhov refractive index ntawm cov khoom siv GaN yog 2.3. Thaum lub teeb tawm ntawm sab hauv los ntawm cov khoom siv lead ua rau huab cua, lub kaum sab xis tseem ceeb =0 = kev txhaum-1 (n2 / n1) raws li txoj cai ntawm kev tshem tawm.
Qhov twg n2 sib npaug rau 1, piv txwv li qhov ntsuas qhov tsis yooj yim ntawm huab cua, thiab n1 yog qhov ntsuas refractive ntawm GaN, los ntawm qhov tseem ceeb kaum θ0 tau suav los kwv yees li 25.8 degrees. Hauv qhov no, lub teeb uas tuaj yeem hloov tawm yog tsuas yog lub teeb nyob rau hauv lub kaum sab xis ntawm qhov xwm txheej kaum ≤ 25.8 degrees. Nws raug tshaj tawm tias sab nraud quantum efficiency ntawm tam sim no GaN nti yog li 30% -40%, thiab vim li ntawd, vim kev nqus ntawm sab hauv ntawm cov siv lead ua nti. Qhov kev faib ua feem ntawm lub teeb uas tuaj yeem tawm sab nraud qhov siv lead ua muaj qhov me me. Nws tau tshaj tawm tias kev ua lag luam sab nraud quantum efficiency ntawm GaN chips yog tam sim no nyob ib ncig 30% -40%. Ib yam li ntawd, lub teeb tawm los ntawm nti tau kis tau los ntawm cov khoom siv encapsulating mus rau qhov chaw, thiab cov nyhuv ntawm cov khoom ntawm lub teeb rho tawm kev ua haujlwm zoo kuj raug txiav txim siab.
Yog li, txhawm rau txhawm rau txhim kho lub teeb hluav taws xob ua kom zoo dua ntawm LED cov pob khoom, nws yog qhov tsim nyog yuav tsum nce tus nqi n2, uas yog, txhawm rau txhim kho qhov ntsuas qhov ntsuas ntawm cov khoom ntim, thiaj li nce qhov tseem ceeb kaum ntawm cov khoom, yog li txhim kho lub pob luminous efficiency ntawm cov khoom. Nyob rau tib lub sijhawm, cov khoom siv encapsulation absorbs lub teeb tsawg dua. Txhawm rau nce qhov sib piv ntawm lub teeb ci, qhov zoo ntawm lub pob yog nyiam dua arched lossis hemispherical yog li thaum lub teeb tau qhia los ntawm cov khoom encapsulating rau cov huab cua, nws yuav luag perpendicularly xwm txheej ntawm lub interface, yog li tsis muaj kev cuam tshuam tag nrho yog tsim tawm.
3. Kev ua haujlwm thau duab
Muaj ob lub ntsiab sib txawv ntawm kev xav kho. Ib qho yog qhov kho kom pom nyob sab hauv lub nti, thiab lwm qhov yog qhov pom ntawm lub teeb los ntawm cov khoom siv encapsulation. Kev kho qhov tshwj xeeb ntawm sab hauv thiab sab nraud txhim kho cov kev faib ua feem ntawm lub teeb tawm ntawm sab hauv ntawm lub nti thiab txo qhov kev nqus sab hauv ntawm lub nti. Txhim kho qhov zoo luminous ntawm lub zog LED khoom. Los ntawm qhov kev pom ntawm kev ntim khoom, lub hwj chim LED feem ntau ntsia lub zog sib tsoo ntawm cov hlau txuas lossis cov ntsaws ruaj ruaj nrog cov kab noj kom zoo. Bracket-type reflective kab noj hniav feem ntau siv electroplating txhawm rau txhim kho kev xav, thaum substrate-type reflective kab noj hniav feem ntau polished. Nyob rau hauv hom, kho plating kuj tseem ua tiav raws li cov xwm txheej, tab sis ob txoj kev kho saum toj no cuam tshuam los ntawm qhov tseeb ntawm cov pwm thiab cov txheej txheem, thiab cov kab noj hniav zoo nkauj tom qab kev kho mob muaj qee qhov cuam tshuam, tab sis nws tsis zoo Cov. Tam sim no, kab rov tav-hom tuaj ci ntsa cav tau ua nyob rau hauv Suav teb. Vim tias qhov tsis txaus polishing precision lossis oxidation ntawm cov hlau plating txheej, qhov cuam tshuam zoo yog qhov tsis zoo, uas ua rau ntau lub teeb pom kev tom qab raug xwm txheej ntawm thaj chaw xav, thiab tsis tuaj yeem ua rau lub ntsej muag ci ntsa iab raws li lub hom phiaj phiaj, yog li qhov kawg ua rau qhov kawg. Lub teeb rho tawm kev siv tom qab ntim tau tsawg.
Los ntawm cov kev tshawb fawb thiab kev sim ntau yam, peb tau tsim kho txoj kev kho kom zoo los ntawm kev siv tshuaj pleev xim rau cov khoom siv organic nrog cov cai ywj pheej. Los ntawm cov txheej txheem no, lub teeb ci rau hauv cov kab noj hniav hauv lub cev yog nqus tau me me heev, thiab feem ntau ntawm lawv siv tau. Lub teeb ntaus nws yog xav txog lub teeb uas tawm ntawm qhov chaw. Lub teeb rho tawm kev ua haujlwm ntawm cov khoom yog li kho tuaj yeem raug nce ntxiv 30% mus rau 50% piv nrog tias ua ntej kev kho mob. Peb tam sim no 1W dawb lub teeb ci hluav taws xob LEDs muaj qhov kev ua tau zoo ntawm 40-50lm / W (cov ntawv kuaj tau los ntawm cov chaw taws teeb PMS-50 tsom qhov ntsuas tsom xam) thiab tau tiav cov txiaj ntsig ntim zoo.
4. Phosphor xaiv thiab txheej
Rau lub hwj chim dawb LEDs, qhov nce hauv luminous efficiency tseem cuam tshuam rau kev xaiv phosphor thiab cov txheej txheem. Txhawm rau txhawm rau txhim kho kev ua haujlwm ntawm phosphor los txhawb lub xiav nti, ua ntej, kev xaiv ntawm phosphor yuav tsum tsim nyog, suav nrog kev zam lub ntuag, qhov loj me, qhov zoo tshaj plaws kev ua haujlwm, thiab lwm yam, thiab kev soj ntsuam zoo yog yuav tsum tau, coj mus rau hauv account ntau lub zog. Thib ob, txheej txheej ntawm phosphor yuav tsum zoo ib yam, zoo dua qhov tuab ntawm txheej txheej kua nplaum ntawm txhua lub teeb ci xim ntawm cov nplaim hluav taws xob tsis sib thooj, yog li kom tsis txhob muaj lub teeb pom kev hauv zos tsis tuaj yeem ua vim vim tsis sib luag tuab, thiab qhov zoo ntawm cov nqaij ntawd tuaj yeem hloov kho.
Cov qauv tsim cua sov tau muaj qhov zoo ntawm kev txhim kho lub luminous efficiency ntawm lub zog LED khoom, thiab kuj yog qhov yuav tsum tau ua ntej kom ntseeg tau cov khoom lub neej thiab kev ntseeg siab. Cov tsim tawm lub teeb pom kev zoo channel tau tsom rau cov qauv tsim, xaiv cov khoom siv thiab cov txheej txheem kev ua kom zoo ntawm lub ntsej muag muaj kab noj hniav, txhaws kua nplaum, thiab lwm yam, thiab tuaj yeem txhim kho lub teeb hluav taws xob ua kom zoo ntawm lub zog LED. Rau lub zog-hom dawb LEDs, kev xaiv phosphor thiab txheej txheem tsim tseem yog qhov tseem ceeb rau kev txhim kho ntawm qhov chaw thiab kev txhim kho ntawm luminous efficiency.