Txheeb ze rau pom LEDs, UV LED yog lub lag luam nyob ntsiag to ntawm tsuas yog $ 30 lab, tsis ntev los no qhov tawg ntawm hluav taws xob muaj zog thiab siv tau ua rau lub chaw nyob ntawm cov teeb meem muaj mercury-vapor hauv cov ntawv thov suav nrog UV kho thiab nrhiav kom tau cuav, ceeb toom LAURA PETERS.
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Cov ntawv sau no tau luam tawm nyob rau lub Ob Hlis 2012 qhov teeb meem ntawm LEDs Magazine.
Saib ntawm Daim Ntawv Teev Cov Ntsiab Lus thiab rub tawm cov ntawv PDF ntawm cov ntawv qhia tiav ua tiav Lub Ob Hlis 2012 qhov teeb meem.
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Hauv qab daim duab uas pom pom muaj nyob ntawm cov xov kab (wavelengths) hu ua ultraviolet (UV). Muaj li ntawm 100 txog 400 nm, kev siv hluav taws xob tuaj yeem siv tau los ua kom cov tshuaj pleev ib ce huv huv, ua qhov kev tshuaj ntsuam xyuas, kho cov khoom siv (Daim Duab 1) thiab ntxuav cov dej kom huv, nrog rau lwm yam kev siv. Niaj hnub no, raws li cov teeb meem nrog LEDs hauv qhov pom kev pom, UV LEDs tsuas yog pib los hloov cov chaw tsim UV nyob rau hauv qhov sib txawv ntawm cov kev ua lag luam.
Cov. FIG 1 Kab laum huab cua txias cua txias UV-LED-kho cov khoom siv zoo (qhov chaw: Phoseon Technology) ..
LIG. 1.
"Piv nrog rau kev lag luam ua lag luam LED teeb pom kev lag luam ntau dhau los, kev lag luam UV-LED lag luam yog qhov yuam kev nyob ib ncig ntawm $ 30 lab, tab sis nws tau loj hlob sai," Mike Lim, tus thawj coj ntawm kev lag luam thoob ntiaj teb thiab kev lag luam tshiab rau Luminus Devices, raws li hauv Billerica , MA.
Txog tam sim no, kev lag luam UV tua tau zoo siab tshaj plaws ntawm kev tsim kho UV-LED vim qhov kev sib tsoo tsis ntev los no hauv kev sib txawv ntawm cov nplaim hluav taws xob ntawm UV-LED dhau ntawm 4W / cm2 cim ntawm qhov sib txawv wavelengths xav tau los coj UV-LED kho kom zoo chaw. "Thawj thawj zaug, LEDs tau mus txog lub zog loj uas ua rau UV LEDs sib tw nrog cov peev txheej uas twb muaj lawm," Uwe Thomas, tus thawj coj ntawm emitter Cheebtsam nrog LED Engin, tus muab kev pabcuam UV thiab pom LEDs nyob hauv Santa Clara, CA.
UV-A, B thiab C
Kev ua kom zoo tau cuam tshuam tus ntoo khaub lig-polymerization ntawm cov khoom siv duab, uas tuaj yeem yog tus cwj mem (luam ntawv), nplaum lossis txheej, thiab feem ntau ua ntawm 395 nm, 385 nm lossis 365 nm, wavelengths uas yog ib feem ntawm UV-A spectrum (315 -400 nm). Lwm qhov tseem ceeb UV-A thov yog kev tshuaj xyuas lub tshuab raws li pom kev ntawm lub tshuab. UV-LED teeb tsom hauv qhov ntau no yog siv los txhawm rau txhawm kev dag thiab cov nyiaj, thiab muab cov txiaj ntsig ntawm kev siv nyob hauv qhov chaw muaj teeb pom kev zoo, uas yog qhov nyuaj siv lub teeb muaj mercury-vapor.
Hauv UV-B spectrum (280-315 nm), cov ntawv thov rau UV LEDs suav nrog kev kho mob, kev kho mob lub teeb, kev soj ntsuam kev tshawb nrhiav thiab tshuaj pom. Nws tau kwv yees los ntawm kev tshawb fawb los ntawm lub tuam txhab Yole Développement (Lyon, Fabkis) tias 90% ntawm UV LED daim ntaub ntawv niaj hnub no yog nyob ntawm UV-A thiab UV-B thaj tsam (Daim duab 4). Yole tau hais tias nws xav tias kev ua lag luam rau UV LED yuav loj hlob los ntawm 30% txhua xyoo los ntawm $ 25 lab hauv 2010 txog ntau dua $ 100 lab hauv xyoo 2016. Daim duab 5 qhia txog kev pom ua tau zoo tshaj los ntawm Optoelectronics Industry Development Association, Koom Haum Optoelectronics International thiab European Photonics Industry Consortium.
LOJ 2 Tuag ntau UV emitter nyob hauv ib lub pob tej hub (qhov chaw: LED Engin)…
LIG. 2.
Tshaj li cov ntawv thov no, UV-B hluav taws xob tau paub tias muaj cov txiaj ntsig kev noj qab haus huv nrog rau kev suav tshuaj vitamin D nyob hauv tib neeg uas raug tshav ntuj. UV-B kuj pab tsim cov polyphenols ntau rau qee cov zaub nplooj ntsuab xws li zaub xas lav liab. Polyphenols ntseeg tau tias muaj cov antioxidant zoo. “Feem ntau cov nroj tsuag no tau cog rau hauv tsev ntsuab nyob niaj hnub no, uas txhob txwm ua rau UV dhau ntawm cov xim ci kom muaj peev xwm ua kom cov nroj tsuag loj tuaj. Qhov zoo siab, peb muaj cov pov thawj pom tias thaum cov ntoo no tau raug rau UV-B LEDs lub sijhawm luv luv ua ntej sau qoob, lawv cov ntsiab lus polyphenol tau zoo tsis muaj kev cuam tshuam cov nroj tsuag loj, "piav qhia Cary Eskow, tus thawj coj thoob ntiaj teb ntawm advanced LEDs thiab taws teeb rau Avnet Electronics Marketing hauv Phoenix , AZ, uas faib tawm UV LEDs. Nws txuas ntxiv ”Nov yog txoj hauv kev tshiab rau kev nce rov hais dua ntawm qee cov zaub mov uas tsis siv tshuaj lom neeg. Polyphenols kuj tau txais kev saib xyuas vim yog lawv cov anticarcinogenic purport, antiproliferative thiab antimutagenic cov yam ntxwv. “
Hauv qis UV-C spectral ntau (100-280 nm), cov ntawv tso npe thawj LED yog huab cua thiab dej kom tsis muaj kab mob thiab cov ntsuas ntawm cov khoom siv suav nrog nrog cov uas ua cov kev ntsuas spectroscopic thiab fluorescence ntsuas. Cov khoom siv tshuaj tua kab mob thiab roj ntsha hauv lub cev tseem ua haujlwm hauv qhov kev ntsuas ntau yam no.
UV nyob rau hauv 250-275 nm ntau ua rau cov dej tsis huv, huab cua thiab thaj chaw los ntawm kev rhuav tshem cov DNA thiab RNA ntawm cov kab mob me me thiab tiv thaiv lawv cov luam tawm. Tshwj xeeb, 275 nm ntseeg tau hais tias yog qhov zoo tshaj nthwv dej rau kev tua cov kab mob xws li E-coli hauv dej. Qhov tseeb, engineers ntawm Sensor Electronic Technology Inc. (SETi), nyob hauv Columbia, SC, tau txiav txim siab tias 275 nm yog qhov zoo tshaj plaws nthwv dej rau cov dej tsis ua haujlwm. SETi tau pom tias kev sib kis ntawm cov dej haus hauv ib txoj hauv kev txaus-los ntawm kev siv cov hluav taws xob tsawg dua 40 mW ntawm UV fais fab.
Hloov mus rau mercury arc teeb
Hauv kev tsim cov khoom ua haujlwm zoo, muaj cov teeb tsa muaj mercury-vapor muaj teeb meem tsis muaj lub neej luv (2000-10,000 hr), maj mam sov thiab txias lub sijhawm, thiab dav dav hluav taws xob muaj zog. "Tsis tas li ntawd, ntau tshaj 60% ntawm lub zog uas tau siv rau lub teeb pom kev zoo-vapor muaj teeb meem dhau mus ua lub zog siv hluav taws xob, hais ua lwm yam, kev kub," Eskow hais. Nws hais ntxiv tias UV cov pa tawm ntawm mercury vapor teeb tawm sai dhau ntawm nws lub neej ua haujlwm vim tias qee qhov nws cov khoom siv electrode vaporizes, tso zaj duab xis nyob rau sab hauv lub raj quartz uas UV tsis tuaj yeem ua rau, cov neeg siv tsis yooj yim twv tus nqi ntawm UV tsim nyob rau tom qab lub sijhawm;. feem ntau qhov no yog ib qho tseem ceeb txheej txheem parameter.
LIG. 3. UV-C LEDs rau kev siv tshuaj tua kab mob, los ntawm Crystal IS, Inc. Lub tuam txhab tau tsis ntev los no los ntawm Nyiv-Asahi Kasel.
LIG. 3.
Cov teeb tsa mercury muaj qhov siab loj ntawm 365 nm tab sis ob peb lub ncov me dua hauv thaj chaw pom thiab duab liab (Daim duab 7). Ib qho poob qis rau cov hnub nyoog ntxiv yog lub cim kub thaum luam ntawv thiab lwm yam kev ua haujlwm kho. Steve Metcalf, CEO thiab tus thawj tswj hwm ntawm Air Motion Systems (AMS) tau hais tias "Nrog rau cov plastics thiab lwm cov khoom siv kub-ua kom zoo, muaj kev sib tw tiag tiag hauv kev luam ntawv vim tias qhov nruab nrab tau cuam tshuam los ntawm lub tshav kub ntawm cov teeb meem mercury," cov tshuab raws River River Falls, WI. Nws muab cov piv txwv uas suav cov ntawv pov npav yas lossis ntawv qiv nyiaj, uas siv ntawv luam ntawv lithographic.
Metcalf tau hais ntxiv tias ntau tus neeg uas yuav tsis xav txog kev tua UV vim tias txoj kev kho cov txheej txheem tsis yooj yim - cov xov hluav taws xob ntau, qhov kub ntawm cov tshuaj teeb pom kev zoo thiab cov teeb meem ib puag ncig - tam sim no yuav xav txog UV-LED kho vim tias nws subverts cov tsoos muaj teeb meem ntawm cov txheej txheem qub. Cov.
UV LED coj cov txiaj ntsig zoo li paub tseeb txog qib hluav taws xob theem xa mus rau qhov chaw nruab nrab ua kom zoo, thiab lwm yam zoo dua cov LED tau paub txog, xws li muaj peev xwm mem tes-dav-hloov kho qhov tshwm sim, hais Eskow.
Txoj kev hloov mus rau UV LEDs kuj qhib qhov rooj rau ntau cov phooj ywg zoo rau kev tiv thaiv ib puag ncig. Nrog rau cov tiam tom ntej ntawm cov khoom lag luam uas number case, txheej thiab nplaum cov tuam txhab tau tsim kho, lawv tau siv lub sijhawm los ua ntu-theem tsis txaus siab organic sib xyaw (VOCs) cuam tshuam nrog cov kuab tshuaj -based formulations ntawm yav dhau los chemicals.
Txoj kev kho kom zoo dua
Rau qhov ntev-wavelength UV khoom, nyob rau hauv cov qauv zoo sib xws rau xiav LED fabrication, InGaN-based epilayers yog zus ntawm sapphire substrates los tsim 385, 395 thiab 405 nm UV LED rau kev kho. Ib qho txiaj ntsig tseem ceeb rau cov khoom siv hluav taws xob ntau dua yog qhov lawv tuaj yeem tsav ntawm lub zog siab dua. "395 nm yog qhov chaw qab zib tshaj plaws rau kev tua kab mob UV LED, vim tias ntawm 405 nm cov qauv tsim tawm rau lub teeb pom kev zoo, yog li koj xav tau qis dua li 400 thaum tau tsav lub LEDs ntawm lub zog loj," Lim hais. Txhua tus neeg muab kev pab cuam tseem ceeb ntawm kev kho cov tshuaj sib tov (photoinitiators thiab resins), tsis ntev los no tau nqa ntau dua-wavelength inks thiab cov ris tsho ua lag luam los ua qhov kev xav tau no.
LIG. 4. Feem ntau cov ntawv thov nyob hauv UV-A thiab UV-B qhov chaw ntawm lub spectrum.
LIG. 4.
Ntxiv rau kev tsim hluav taws xob ntau, qhov siab dua-ntu ntev dua ntawm LED LEDs ua kom siab dua phab ntsa-ntsaws kev ua tau zoo. Piv txwv li, ntawm 365 nm, lub zog tawm ntawm UV hluav taws xob tsuas yog 5-8% ntawm lub hwj huam muab nkag. Ntawm 385 nm, qhov kev ua tau zoo dua no, tab sis tsuas yog ~ 15%, ua rau lub plhaw-wavelength siab dua qhov kev xaiv zoo dua.
Kev ua cov txheej txheem yuav tsum muaj cov loj loj, muaj zog ntawm cov LEDs (ntau tuag / nti) npaj rau hauv cov ntom ntom ntom ntom ntom nti hauv cov txheej txheem sib tshooj nti, ze rau ntawm lub qhov rai emitter nrog ib qho huab cua-lossis dej-txias hauv lub hauv paus kom tshem tawm cov kub ntawm backside ntawm lub rooj tsavxwm. "Nws tsis muaj teeb meem dab tsi yog qhov kev siv UV ntau ntawm lub qhov rais emitter, qhov tseem ceeb yog qhov siv ntawm cov xov xwm nthuav tawm," Metcalf tau hais. Nyob ntawm cov cuab yeej siv thiab kev ua kom zoo, cov xov xwm tuaj yeem yog 1 mus rau 100 hli los ntawm emitter qhov rais, uas AMS tau tsim cov khoom lag luam tshwj xeeb. Ntxiv rau, cov hlau-txias PCB yog siv los tog cov cua sov kom deb ntawm qhov sib npaug ntawm LED.
Cov cua txias ua haujlwm kuj tseem siv. Piv txwv li, cov txheej txheem kho tau pom hauv Daim Duab 1, uas muaj lub qhov rais emitter ntawm 150 x 20 mm thiab flux ntom ntawm 4W / cm ², tuaj yeem siv rau qhov chaw tua kab mob rau sab hauv, txheej txheej lossis nplaum. Niaj hnub no, UV-LED khoom siv kho kom zoo yog feem ntau tsim tshwj xeeb kom haum rau daim ntawv thov. Metcalf piav qhia txog cov xov xwm loj ntawm lub txaj txaij sau ntawv vim yog siv cov xov tooj hluav taws xob tsawg dua, tab sis kev siv hluav taws xob ntau dua, ua rau cov xaim thiab cov duab thev naus laus zis xav tau kom ze ze ntawm qhov siab-flux-ceev cov LEDs. Txawm hais tias qhov hluav taws xob tsis pom, collimating optics tau siv los xa cov hluav taws xob nrog qib hluav taws xob tsis sib luag ntawm cov phiaj xwm xov xwm. Digital inkjet curing yog thawj ntu txais yuav UV LED vim qhov xav tau ze ze rau kev tshaj xov xwm rau cov taub hau luam tawm kom ua haujlwm tau zoo. Qhov no tau pom lub ntuj haum rau UV-LED teeb raws li qhov kev ntxim nyiam yog qhov siab tshaj plaws ntawm lub qhov rais emitter.
LIG. 5. UV-LED lag luam keeb kwm thiab twv ua ntej.
LIG. 5.
Stacy Volk, tshaj tawm kev tshaj lij kev lag luam ntawm Phoseon Technology hauv Hillboro, LOSSIS, lub chaw tsim khoom ntawm UV-LED kho cov txheej txheem, taw qhia qee qhov zoo ntxiv cuam tshuam nrog UV-LED tua kab mob suav nrog kev tswj curing siv, cov khoom siv kho qhov muag, thiab qhov tseeb tias tshuab yog me thiab ntuag.
Ib qho ntawm cov teeb meem kev lag luam muaj peev xwm tau ntsib ua yog qhov tsis sib xws hauv kev ntsuas kev ntsuas thiab cov ntsiab lus parameter, piv txwv li, txhais tau siv hluav taws xob radiometric. Lub Koom Haum UV Curing Association (www.uvledcuring.org) tau tsim los tsis ntev los no los ntawm kev kho cov tuam txhab Phoseon Technology, Kev Sib Tham Txuj Ci Technology Limited thiab Lumen Dynamics kom "tsim cov lus qhia thiab ua kom muaj kev sib raug zoo thoob plaws kev lag luam," hais Bill Cortelyou, Thawj Tswj Hwm thiab CEO ntawm Phoseon Technology Cov. Lub koom haum tseem nrhiav kev pabcuam kev nrawm ntawm kev thov tshwj xeeb tshaj yog UV LED, qhia cov kws tshawb fawb, kev sib xyaw thiab cov neeg siv kawg hais txog cov txiaj ntsig ntawm UV LEDs, thiab muab lub rooj sib tham rau kev lag luam kev sib txuas lus thiab kev sib koom tes.
Allan Firhoj, Thawj Coj thiab CEO ntawm Lumen Dynamics tau hais tias "Hauv peb lub sijhawm 15 xyoo dhau los ntawm kev kho cov khoom siv thev naus laus zis. Nws hais ntxiv, "Lub Koom Haum UV tua kab hluav taws xob UV yuav ua tus pabcuam hauv kev ua lag luam kom muaj kev paub thiab kev nkag siab txog UV LED thev naus laus zis thiab cov txiaj ntsig lag luam ntau."
Lub koom haum thib ob, Koom Haum International LED-UV (www.leduv.org), tau tsim nyob rau lub Cuaj Hli 2011 hauv Nyij Pooj los npaj cov tsim cov tshuab luam ntawv UV-LED, cov tsim hluav taws xob UV-LED thiab cov kua cwj mem thiab cov txheej txheem tsim kom ruaj khov thiab tsim kom ruaj khov thiab qhov chaw ib puag ncig tiv thaiv UV-LED luam ntawv thev naus laus zis.
Nti tuam txab
Cov tuam txhab uas tsim cov UV-LED chips suav Crystal IS, raws li hauv Green Island, NY (Daim duab 3) ;. Dowa Electronic Material Co Ltd, raws li hauv Tokyo, Nyiv ;. Nichia Corp, nyob hauv Tokushima, Nyiv ;. SemiLEDs, raws li nyob rau hauv Hsinchu, Taiwan; .. SETi, thiab Seoul Optodevice Co Ltd, raws li hauv Kyunggi-do, Kaus Lim Kauslim, tus tswv lag luam muag khoom ntawm Seoul Semiconductor.
LIG. 6. SETi's UVClean LED arrays xa lub zog loj heev sib zog-UV teeb ntawm 300-320 nm, qhov zoo tshaj plaws rau cov duab thaij duab.
LIG. 6.
UV-LED cov tuam txhab tsom rua txuas ntxiv txhim kho qhov ua tau zoo thiab lub neej ntawm lawv cov cuab yeej thaum txo nqi. Seoul Optodevice muaj kev cog lus koom tes nrog SETi, uas tsim cov khoom siv hluav taws xob ntau ntawm UV LED thiab lub teeb txawb, thiab ua txhua yam los ntawm wafer ua rau cov kev cai teeb lub teeb. Lub tuam txhab muab cov UV emitters nyob rau hauv cov hermetically-ntim hlau-iav pob khoom (TO-18, TO-39 thiab TO-3), nrog cov khoom lag luam thiab cov kev cai daws teeb meem thaj tsam nthwv dej los ntawm 240 txog 355 nm. Daim duab 6 qhia cov piv txwv ntawm UV -LED nyob rau hauv cov teeb tsa tsim los xa cov hluav taws xob hauv thaj tsam 300-320 nm rau kev siv duab kho mob xws li kev kho mob ntawm daim tawv nqaij xws li psoriasis lossis eczema.
Tim Bettles, tus thawj coj ntawm kev lag luam thiab muag khoom ntawm SETi tau hais tias nws txoj kev cog lus tsim khoom nrog Seoul Optodevice yog tsim los pab SETi tsav nws cov hluav taws xob ntau ntawm UV LED thiab teeb ci siab dua thaum tsav tsheb txo nqi. "Peb thawj cov khoom siv hluav taws xob UV-LED tau tsim nyob rau xyoo 2004 thiab txij thaum ntawd los, peb tau tuaj ntev hauv kev tsim kho thev naus laus zis thiab kev siv khw. Tam sim no peb tab tom sim SETi lub peev xwm rau kev tsim khoom ntau ntau kom tau raws li qhov xav tau tshiab los ntawm cov neeg siv khoom lag luam, "Bettles hais. SETi tsis ntev los no tshaj tawm kev yuav khoom ntawm qhov chaw tshiab, qhov chaw uas nws npaj yuav tsim dua 100 lab UV LEDs hauv ib xyoos.
Devin Tang, tus neeg saib xyuas kev lag luam ntawm SemiLEDs tau hais tias lub tuam txhab muaj tag nrho cov kab ntawm cov tsuav liab qab thiab saum npoo av siab zog ntim cov LEDs hauv thaj tsam 360-400-nm. Nws tau sau tseg tias lub tuam txhab cov khoom lag luam sib txawv los ntawm lwm tus hwm rau cov chips 'tooj liab-alloy substrates, uas tso cai rau cov thermal conductivity (400 W / mK) thiab silicon substrates hauv pob, uas txo nqi.
Epigap Optronic, raws li hauv Berlin, Lub Tebchaws Yelemees, tus xa khoom loj rau Dowa UV LEDs, tau hais tias Dowa tsim cov khoom lag luam 265, 280, 310, 325 thiab 340 nm liab qab dice lossis ntim cov LEDs. Nichia tsim tsim muaj 365, 375 thiab 385 nm nto-mount siab-zog LEDs thiab teeb ua hluav taws xob tsawg. Crystal IS tsim tawm 260 nm UV LEDs thiab yog lub tuam txhab tib lub tsev tsim hluav taws xob LED ntawm AlN substrates.
Wafer-ua teeb meem
Raws li tau qhia yav tas los, epilayers ntawm InGaN thiab GaN, loj hlob los ntawm MOCVD, yog siv rau qib siab-wavelength UV LEDs sib tov ntawm sapphire substrates, tab sis ntawm qis wavelengths, epilayers ntawm AlGaN nrog nce txhuas cov ntsiab lus yuav tsum siv. Muaj ntau cov sib txawv sib xyaw ua ke nrog cov khaubncaws sab nraud povtseg ntawm AlGaN, AlInGaN, AlInN thiab AlN epilayers, tab sis txawm li cas los xij, nws yooj yim los cog cov khoom raws AlGaN ntawm AlN substrates dua sapphire ntawm qee kis, uas tau txhawb txoj kev loj hlob ntawm AlN-substrate tus neeg xa khoom xws li Hexatech, raws li nyob rau hauv Morrosville, NC. Txawm li cas los xij, AlN substrates tsuas yog muaj nyob hauv qhov ntau thiab tsawg thiab tseem tshuav ntau kim tshaj sapphire wafers, yog li txwv txoj kev ua lag luam no.
LIG. 7. Kev pom tawm ntawm cov mercury-vapor teeb hauv UV thiab thaj chaw pom.
LIG. 7. Peb muaj 7.
Tsis ntev los no, Theodore Moustakas ntawm Boston University tau sim ua ntej siv MBE (molecular beam epitaxy) kom loj hlob zoo dua (qhov ua tau zoo sab hauv quantum efficiency) UV LED cov cuab yeej siv AIGaN-based txheej ntawm sapphire substrates. Txoj hauv kev no yuav sib tw nrog ntau yam MOCVD txheej txheem siv los tso nyiaj AlGaN hnub no.
Optics thiab ntim khoom
Txawm hais tias UV LED cov lag luam tau ua haujlwm ntau los txhim kho kev ua kom zoo dua qub hauv kev ua kom zoo dua qub thiab qhov ua kom zoo dua ntxiv, tag nrho cov kev ua haujlwm tseem qis qis dua 20%, txhais tau hais tias muaj qhov kub ntau yuav tsum tau ploj los ntawm lub diode kev tshuam. "Yuav kom ua tiav qhov yuav tsum tau ua flux densities nrog cov tshuab tsim hluav taws xob niaj hnub no, ntau lub tshuab ua kom tuag yuav tsum tau tsav los ntawm qhov muaj zog tshaj plaws tam sim no. Qhov no tsuas yog ua tau nrog pob LED uas muaj peev xwm tuav lub zog sib luag rau lub neej ntawm cov khoom. Ib lub ntsiab lus ntawm cov thawv tsis muaj kev ntxhov siab thiab lub khob tsom iav pab tshem tawm cov kev ntim khoom tsis zoo uas cuam tshuam nrog UV LED, "Thomas hais. Nws piav qhia LED Engin's patented ntau txheej txheej ceramic substrate nrog qhov tsis tshua muaj cua sov tsis kam uas ceev ceev ua kom sov los ntawm qhov tuag tav (Daim duab 2).
Thaum qee qhov UV LED sau los ntawm cov pob zeb ua ke substrates, ntau cov chaw tsim khoom, tshwj xeeb ntawm cov khoom siv hluav taws xob ib leeg, siv TO-tuaj yeem ntaus los ntawm-pob cov pob nrog lub iav sab saum toj uas muaj kev sib kis loj ntawm UV. Kev hloov pauv ntawm epoxy lo ntsiab muag nrog tiaj tiaj lossis dome-daim iav iav uas muaj peev xwm UV kis tau tus mob yog qhov kev txhim kho tshiab, thiab ib qho uas tau tso cai txuas ntxiv lub neej ntawm ib puag ncig 5000 teev txog rau ntev txog 30,000 teev. UV nrawm nrawm degradation ntawm cov khoom siv epoxy yam ntxwv tsis ncaj, muaj kev cuam tshuam ncaj qha rau lub neej ntev. Lub iav lo ntsiab muag muab ntxiv kom ruaj dua thiab txhim kho kev ntseeg tau. Lwm txoj kev xaiv yog los sib txuas lub khob iav nrog silicone encapsulant kom haum rau ntau dua flux ntom ntom nti thiab ntau dua kev ua tau zoo dua lub neej luv (15,000-20,000 hr).
Qhov kev xaiv ntawm seb puas yuav siv hermetic sealing hauv pob yog qee zaum txiav txim los ntawm cov ntaub ntawv hauv cov nti. "Ib qho txhuas-nitride substrate yuav luag hais txog kev siv pob khoom ntim, vim tias cov khoom siv aluminium ntau dua, cov cuab yeej muaj kev cuam tshuam ntau dua rau cov pa oxygen, yog li nws lub hermetic foob yuav tiv thaiv UV cuab yeej zoo dua," piav qhia Frank Gindele, tus thawj tswj kev tsim khoom rau Schott Ntim Ntim Hauv Av Landshut, Lub Tebchaws Yelemees. Tus tshiab tooj liab-thiab iav-pob ntim los ntawm Schott muaj qhov zoo ntawm cov thermal conductivity thiab hermeticity.
Kev piam sij ntawm UV
Nws yog ib qho tseem ceeb kom paub txog qee qhov zoo tshaj plaws uas ua rau UV LEDs muaj zog heev thiab pab tau - lawv cov yoj hluav taws xob qis thiab siab zog -. Kuj tseem yog cov kev coj ua uas ua rau lawv txaus ntshai Cov ntawv ceeb toom ntawm UV LEDs thiab lawv cov khoom tau pom tseeb tab sis dais ceeb toom:. UV-LEDs tso tawm cov duab hluav taws xob ultraviolet tsis pom thaum ua haujlwm, uas yuav tsim kev puas tsuaj rau lub qhov muag lossis tawv nqaij, txawm tias lub sijhawm luv luv (Yog xav paub ntxiv txog kev nyab xeeb photobiological, saib peb cov lus ntawm cov ntawv, Ntu 3 uas tshwm rau p.63 ntawm qhov teebmeem no .)
Cov kauj ruam tom ntej
Thaum nug kom txheeb xyuas qhov teeb meem tseem ceeb uas tuaj yeem ua rau cov neeg siv UV hloov pauv los ntawm qhov muaj nqis ntawm cov kab mob mercury-vapor mus rau UV LEDs, ntau tus neeg koom nrog kev lag luam hais tias nws los rhuav qhov kev lag luam tam sim no thiab, qhov tseeb, nqi. Lim xav tias kev sib puag ncig lub neej ntev mus rau txoj kev saws me nyuam yuav mus ntev rau kev saws me nyuam. "Kuv xav tias yog tias peb tuaj yeem tau txais zoo 250-nm, 285-nm thiab 300-nm LEDs, peb lub nthwv dej, ces peb tuaj yeem kaw qhov rooj ntawm cov teeb tsa roj mercury."
