Lub teeb dawb LED lub neej ntev, lub zog siab thiab kev siv hluav taws xob tsawg
Yav dhau los, txhawm rau ua kom tau txais txiaj ntsig tag nrho ntawm cov nqaj, kev lag luam tau tsim qhov loj me thiab sim ua kom tiav lub hom phiaj xav tau los ntawm txoj kev no, tab sis qhov tseeb, thaum lub zog siv hluav taws xob ntawm LED dawb txuas ntxiv mus txog 1W, Lub nqaj yuav txo qis, thiab cov luminous efficiency yuav raug txo los ntawm 20 ~ 30 feem pua. Hauv lwm lo lus, yog tias qhov ci ntawm cov LEDs dawb yog ob peb zaug loj dua li cov LEDs ib txwm muaj thiab cov yam ntxwv ntawm kev siv hluav taws xob yog kom dhau cov teeb fluorescent, plaub qhov teeb meem loj hauv qab no yuav tsum tau kov yeej ua ntej: a. suppressing kub nce; b. ua kom lub neej ua haujlwm; c. txhim kho luminous efficiency d. Equalization ntawm luminous zog.
Txoj kev tshwj xeeb rau qhov kub thiab txias qhov teeb meem yog txo qhov thermal impedance ntawm pob; txoj kev tshwj xeeb los tswj lub neej kev pab cuam ntawm LED yog txhim kho cov duab ntawm cov nti thiab siv cov nti me me; txoj kev tshwj xeeb los txhim kho lub luminous efficiency ntawm LED yog los txhim kho cov qauv nti thiab siv cov nti me me; Raws li rau cov yam ntxwv luminous yam ntxwv Cov txheej txheem tshwj xeeb yog los txhim kho cov txheej txheem ntim ntawm LED. Nws feem ntau ntseeg tias cov LEDs dawb yuav tsum tau txais cov kev ntsuas saum toj no hauv 2005-2006.
Txoj kev loj hlob ntawm Jingwei los ua kom lub zog yuav ua rau lub thermal impedance ntawm pob kom poob qis dua 10K / W. Yog li ntawd, cov tuam txhab txawv teb chaws tau tsim cov kub kub resistant dawb LEDs los sim txhim kho cov teeb meem saum toj no. Txawm li cas los xij, qhov tseeb tus nqi calorific yog kaum ob lub sij hawm siab dua li cov LEDs qis. Cov saum toj no, thiab qhov kub nce yuav kuj zoo heev txo cov luminous efficiency. Txawm hais tias lub tshuab ntim khoom tso cai rau cov cua sov siab, qhov sib txuas ntawm LED nti tuaj yeem tshaj qhov tso cai. Thaum kawg, kev lag luam thaum kawg pom tau hais tias kev daws qhov teeb meem kub dissipation ntawm lub ntim yog qhov kev daws teeb meem.
Hais txog kev pab cuam lub neej ntawm LEDs, piv txwv li, kev siv cov khoom siv silicon sealing thiab cov khoom ntim ceramic tuaj yeem ua rau lub neej kev pab cuam ntawm LEDs los ntawm 10 feem pua, tshwj xeeb tshaj yog cov luminous spectrum ntawm dawb LEDs muaj lub teeb luv luv nrog wavelengths hauv qab 450nm, tsoos epoxy. resin sealing cov ntaub ntawv Nws yog ib qho yooj yim heev uas yuav raug puas los ntawm luv-yoj lub teeb. Qhov loj ntawm lub teeb ntawm high-power dawb LEDs accelerates deterioration ntawm sealing cov ntaub ntawv. Raws li cov txiaj ntsig ntawm kev lag luam, qhov ci ntsa iab ntawm high-power dawb LEDs tau raug txo los ntawm ntau tshaj ib nrab rau tsawg dua 10, 000 teev ntawm cov teeb pom kev zoo txuas ntxiv, uas tsis tuaj yeem txaus siab rau lub teeb pom kev zoo. Cov kev cai yooj yim rau lub neej ntev.
Hais txog qhov ua tau zoo ntawm cov LEDs, kev txhim kho cov qauv nti thiab cov qauv ntim tuaj yeem ncav cuag tib theem raws li lub hwj chim dawb dawb. Qhov laj thawj tseem ceeb yog tias thaum qhov ceev tam sim no nce ntau dua 2 zaug, nws tsis yog nyuaj rau rho tawm lub teeb los ntawm cov chips loj, tab sis nws yuav ua rau luminous efficiency. Nws tsis zoo li qhov teeb meem ntawm cov hluav taws xob qis dawb LEDs. Yog tias cov qauv electrode ntawm cov nti tau txhim kho, cov teeb meem saum toj no-hais txog lub teeb rho tawm tuaj yeem daws tau.
Hais txog lub uniformity ntawm luminous yam ntxwv, nws yog feem ntau ntseeg hais tias ntev li ntev raws li lub uniformity ntawm cov concentration ntawm phosphor khoom ntawm lub dawb LED yog zoo dua, lub manufacturing technology ntawm phosphor yuav tsum muaj peev xwm kov yeej cov teeb meem saum toj no.
Raws li tau hais los saum toj no, thaum nce lub zog thov, nws yog ib qho tsim nyog yuav tsum tau sim txo cov thermal impedance thiab txhim kho cov teeb meem kub dissipation. Cov ntsiab lus tshwj xeeb yog:
① Txo thermal tsis kam ntawm nti rau pob
②Suppress lub thermal impedance los ntawm lub pob mus rau lub tshuab luam ntawv
③ Txhim kho qhov smoothness ntawm tshav kub dissipation ntawm cov nti
Txhawm rau txo cov thermal impedance, ntau lub tuam txhab txawv teb chaws LED tso cov chips LED rau ntawm cov khoom siv hluav taws xob ua los ntawm tooj liab thiab cov khoom siv ceramic, thiab tom qab ntawd siv cov txheej txheem soldering los txuas cov hluav taws xob xaim hluav taws xob ntawm cov khoom siv hluav taws xob rau kev siv cov kiv cua txias. Ntawm cov cua txias fins nrog yuam cua txias, raws li qhov kev sim ntawm OSRAM Opto Semiconductors Gmb hauv lub teb chaws Yelemees, lub thermal impedance los ntawm LED nti mus rau solder sib koom ntawm cov qauv saum toj no yuav raug txo los ntawm 9K / W, uas yog hais txog 1 / 6 ntawm cov tsoos LED, thiab cov khoom ntim LED siv 2W Thaum lub zog siab, qhov sib txuas ntawm LED nti yog 18K siab tshaj qhov sib koom ua ke. Txawm hais tias qhov kub thiab txias ntawm lub rooj tsav xwm luam tawm tau nce mus txog 500C, qhov sib txuas kub tsuas yog li 700C feem ntau. Nyob rau hauv sib piv, thaum lub thermal impedance raug txo, qhov sib txuas kub ntawm LED nti yuav siab dua. Kev cuam tshuam los ntawm qhov kub thiab txias ntawm lub rooj tsavxwm luam tawm, nws yog ib qho tsim nyog yuav tsum tau sim txo qhov kub ntawm LED nti, hauv lwm lo lus, txo cov thermal tsis kam ntawm LED nti mus rau lub solder sib koom ua ke, uas tuaj yeem txo lub nra ntawm qhov txias. LED nti. Hloov pauv, txawm tias cov LED dawb muaj cov qauv uas tiv thaiv kev tiv thaiv thermal, yog tias lub tshav kub tsis tuaj yeem ua los ntawm lub pob mus rau lub rooj tsav xwm luam tawm, qhov kev ua haujlwm zoo ntawm LED yuav poob qis vim qhov nce ntawm qhov kub thiab txias. LED. Lub tuam txhab encapsulates 1 hli square xiav LED ntawm lub ceramic substrate nyob rau hauv daim ntawv ntawm flip nti, thiab ces pastes lub ceramic substrate rau saum npoo ntawm tooj liab luam tawm Circuit Board. Raws li Panasonic, lub thermal impedance ntawm tag nrho cov module suav nrog cov ntawv luam tawm Circuit Board yog hais txog 15K / W. txog.
Vim tias qhov adhesion ntawm lub tshav kub dissipation fin thiab cov ntawv luam tawm Circuit Court ncaj qha cuam tshuam rau cov thermal conduction nyhuv, kev tsim ntawm lub rooj tsavxwm luam tawm yuav nyuaj heev. Raws li qhov no, cov khoom siv teeb pom kev zoo thiab LED ntim cov tuam txhab xws li Lumi hauv Tebchaws Meskas thiab CITIZEN hauv Nyij Pooj tau ua tiav cov khoom siv hluav taws xob siab. Siv cov thev naus laus zis hluav taws xob yooj yim, cov pob LED dawb uas CITIZEN tau pib ua qauv hauv xyoo 2004 tuaj yeem tso ncaj qha rau cov cua sov dissipation fins nrog lub thickness ntawm li 2 ~ 3 hli mus rau sab nraud yam tsis muaj kev sib txuas tshwj xeeb. Raws li lub tuam txhab, txawm hais tias kev sib txuas ntawm LED chips Lub thermal impedance ntawm 30K / W los ntawm qhov taw tes mus rau qhov txias txias yog loj dua li 9K / W ntawm OSRAM, thiab chav tsev kub yuav nce lub thermal impedance li ntawm 1W hauv ib txwm muaj. ib puag ncig, tab sis txawm tias lub rooj tsav xwm luam tawm ib txwm muaj tsis muaj cua txias rau cua txias, lub teeb dawb Nws kuj tseem siv tau rau kev teeb pom kev tsis tu ncua.
Lub high-power LED nti uas Lumileds pib coj mus kuaj nyob rau hauv 2005 muaj ib tug ntau dua kev sib raug zoo kub ntawm ntxiv rau 1850C, uas yog 600C siab dua li ntawm lwm lub tuam txhab cov khoom nyob rau tib theem. Thaum siv cov khoom siv hluav taws xob RF4 luam tawm hauv Circuit Board, qhov kub thiab txias tuaj yeem nkag rau hauv thaj tsam ntawm 400C sib npaug rau 1.5W fais fab tam sim no (txog 400mA).
Raws li tau hais los saum toj no, Lumileds thiab CITIZEN tau txais kev pom zoo kom nce qhov tso cai ntawm qhov sib txuas, thaum OSRAM ntawm lub teb chaws Yelemees tau teeb tsa LED nti rau ntawm qhov chaw ntawm cov cua kub dissipation fin kom ua tiav cov ntaub ntawv thermal impedance ultra-low ntawm 9K / W, uas. yog siab tshaj qhov thermal impedance ntawm OSRAM txoj kev txhim kho yav dhau los ntawm cov khoom zoo sib xws. 40% txo. Nws yog ib qho tsim nyog hais tias LED module tau ntim nrog tib txoj kev flip nti raws li txoj kev ib txwm muaj, tab sis thaum LED module raug khi rau lub thermal fin, lub teeb-emitting txheej ze tshaj plaws ntawm LED nti yog xaiv raws li qhov sib txuas, thiaj li ua kom lub teeb emitting Lub tshav kub ntawm cov txheej yuav dissipated los ntawm conduction tshaj qhov shortest nrug.
Nyob rau hauv 2003, Toshiba Teeb pom kev zoo Co., Ltd. ib zaug nteg ib tug dawb LED nrog ib tug luminous efficiency ntawm 60lm / W uas tsis muaj thermal impedance ntawm aluminium alloy nto ntawm 400mm square, tsis muaj tshwj xeeb tshav kub dissipation Cheebtsam xws li cua txias kiv cua, thiab sim ua ib tug LED module nrog lub teeb ntawm 300lm. Vim hais tias Toshiba Teeb pom kev zoo Co., Ltd. muaj nrog kev nplua nuj nyob rau hauv kev sim ntau lawm, lub tuam txhab tau hais tias vim kev nce qib ntawm simulation tsom xam technology, dawb LEDs tshaj 60lm / W tom qab 2006 yuav siv tau yooj yim, thermal conductivity ntawm tus ncej yuav ua tau. txhim kho, lossis cov khoom siv teeb pom kev zoo tuaj yeem tsim nrog cua txias los ntawm cov kiv cua txias. Cov qauv qauv uas tsis tas yuav siv tshuab txias tshwj xeeb tuaj yeem siv dawb LEDs.
Hais txog lub neej ntev ntawm LEDs, qhov tam sim no countermeasures coj los ntawm LED manufacturers yog hloov cov sealing khoom, thiab nyob rau tib lub sij hawm disperse cov fluorescent cov ntaub ntawv nyob rau hauv lub sealing khoom, tshwj xeeb tshaj yog cov silicon sealing khoom yog zoo dua li epoxy resin sealing khoom saum toj no cov tsoos. xiav thiab ze-ultraviolet LED chips. Nws yog qhov ua tau zoo dua los tiv thaiv qhov nrawm ntawm cov khoom siv deterioration thiab txo cov teeb pom kev zoo.
Txij li feem pua ntawm epoxy resin absorbing lub teeb nrog lub wavelength ntawm 400 ~ 450nm yog siab li 45 feem pua, cov khoom siv silicon sealing tsawg dua 1 feem pua, thiab lub sij hawm rau halving brightness ntawm epoxy resin yog tsawg dua 10, {{ 5}} teev, thiab cov khoom siv silicon sealing tuaj yeem txuas ntxiv mus txog 40, 000 teev, uas yuav luag zoo ib yam li lub neej tsim ntawm cov khoom siv teeb pom kev zoo, uas txhais tau hais tias cov LEDs dawb tsis tas yuav hloov pauv. thaum siv cov khoom siv teeb pom kev zoo. Txawm li cas los xij, silicone resin yog cov khoom siv elastic thiab mos, thiab cov cuab yeej tsim khoom uas tsis khawb qhov saum npoo ntawm silicone resin yuav tsum tau siv thaum ua. Tsis tas li ntawd, cov khoom siv silicone tau yooj yim txuas nrog cov plua plav thaum lub sijhawm ua haujlwm. Yog li ntawd, nws yog ib qho tsim nyog los tsim cov thev naus laus zis uas tuaj yeem txhim kho cov yam ntxwv saum npoo yav tom ntej.
Txawm hais tias cov khoom siv silicon sealing tuaj yeem ua kom lub neej ua haujlwm ntawm LEDs rau 40, 000 teev, cov khoom siv teeb pom kev lag luam muaj qhov sib txawv. Qhov kev sib cav tseem ceeb yog qhov kev pab cuam lub neej ntawm cov teeb pom kev zoo ib txwm siv thiab cov teeb fluorescent tau txhais tias "kev ci ntsa iab txo mus rau 30 feem pua lossis tsawg dua". Yog tias lub sijhawm ib nrab ntawm LEDs yog 40,000 teev, yog tias qhov ci ntsa iab txo qis dua 30 feem pua, tsuas muaj li 20,000 teev. Tam sim no muaj ob txoj kev tiv thaiv kom ntev kev pab cuam lub neej ntawm cov khoom, xws li:
1. Tshem tawm qhov kub tag nrho ntawm cov LEDs dawb;
2. Txhob siv resin encapsulation.
Nws feem ntau ntseeg tias yog tias ob qho kev ntsuas txuas ntxiv ntawm lub neej saum toj no tau ua tiav, qhov yuav tsum tau muaj 30 feem pua ci ntsa iab rau 40,000 teev tuaj yeem ua tiav. Txhawm rau tiv thaiv qhov kub siab ntawm cov LEDs dawb, txoj kev ua kom txias ntawm LED ntim cov ntawv luam tawm tuaj yeem siv tau. Qhov laj thawj tseem ceeb yog tias cov khoom ntim yuav deteriorate sai nyob rau hauv lub xeev kub thiab muaj zog irradiation. Raws li txoj cai Arrhenius, lub neej yuav txuas ntxiv 2 zaug yog tias qhov kub thiab txias txo los ntawm 100C.
Kev txwv tsis pub siv cov resin encapsulation tuaj yeem tshem tawm tag nrho cov deterioration yam, vim hais tias lub teeb tsim los ntawm LED yog reflected nyob rau hauv lub encapsulation resin. Yog tias koj siv cov resin reflector uas tuaj yeem hloov cov kev taw qhia ntawm lub teeb ntawm sab ntawm lub nti, lub reflector yuav nqus lub teeb, yog li lub teeb tawm ntawm lub teeb yuav ntse. Qhov no yog qhov laj thawj tseem ceeb vim li cas LED cov tuam txhab lag luam ib txwm siv cov khoom ntim khoom siv ceramic thiab hlau.
Muaj ob txoj hauv kev los txhim kho qhov kev ua tau zoo ntawm cov chips dawb LED. Ib qho yog siv lub chip LED loj nrog thaj tsam uas yog 10 npaug loj dua li ntawm cov nti me me (li 1mm2); Ib qho module. Txawm hais tias ib lub teeb ci LED loj tuaj yeem tau txais lub teeb loj loj, ua kom cov nti hauv cheeb tsam yuav muaj qhov tsis zoo, xws li cov hluav taws xob tsis sib xws ntawm lub teeb-emitting txheej hauv cov nti, txwv lub teeb-emitting qhov chaw, thiab kev txo qis ntawm lub teeb tsim hauv lub nti. thaum nws yog radiated rau sab nraud. Hauv kev teb rau cov teeb meem saum toj no, LED cov tuam txhab tau ua tiav qhov kev ua tau zoo ntawm 50lm / W los ntawm kev txhim kho cov qauv electrode, siv cov txheej txheem flip nti ntim, thiab kev sib koom ua ke ntawm cov txheej txheem txheej txheem.
Hais txog cov hluav taws xob sib npaug ntawm tag nrho cov nti, txij li qhov tshwm sim ntawm comb-shaped thiab mesh-shaped (mesh) p-hom electrodes ob lossis peb xyoos dhau los, tus naj npawb ntawm cov tuam txhab siv txoj kev no tau nce ntxiv, thiab cov electrodes kuj tseem muaj. txhim kho nyob rau hauv cov kev taw qhia ntawm optimization.
Hais txog lub flip nti ntim txoj kev, vim hais tias lub teeb-emitting txheej yog ze rau lub pob kawg, nws yog ib qho yooj yim rau emit tshav kub, thiab lub teeb ntawm lub teeb-emitting txheej yog radiated mus rau sab nraud yam tsis muaj teeb meem ntawm kev tiv thaiv los ntawm electrodes. Yog li ntawd, US Lumileds thiab Nyiv Toyoda Gosei tau lees paub txoj kev ntim khoom flip nti. Nyob rau hauv 2005 Matsushita Electric, Matsushita Electric Works thiab Toshiba, uas pib loj zus tau tej cov LEDs loj, kuj ua raws li kev cai. Nichia, uas tau siv lub hnab ntim khoom xaim yav dhau los, thiab 50lm / W cov neeg siv khoom tshwj xeeb LEDs tso tawm xyoo 2004 kuj siv flip nti ntim.
Hais txog kev ua haujlwm saum npoo ntawm cov nti, nws tuaj yeem tiv thaiv lub teeb los ntawm kev cuam tshuam los ntawm sab hauv ntawm lub nti mus rau sab nraud ntawm lub nti los ntawm kev cuam tshuam ntawm lub interface. Raws li ib tug Japanese LED chaw tsim tshuaj paus, thaum flip nti ntim, yog ib tug concave-convex qauv yog teem rau ntawm lub sapphire substrate ntawm lub teeb extraction ib feem, lub extraction ntawm sab nraud ntawm lub nti yuav tsis tshwm sim. Beam tuaj yeem nce 30 feem pua.
