Ua ntej delving rau UV-LED thev naus laus zis, peb yuav tsum ua ntej nthuav dav ntau lub ntsiab lus kom paub tseeb tias peb tab tom tham txog tib yam kev kawm. Qhov no yuav tiv thaiv kev txhais lus tsis raug thiab hla - lub hom phiaj kev sib txuas lus. Ntawm no,UVhais txog UV-cov ntaub ntawv kho tau xws li UV txheej, UV inks, thiab UV nplaum;LEDtshwj xeeb qhia txog ultraviolet LED teeb qhov chaw; thiabUV{0}}LED yog txhais raws li"Kev kho ntawm UV cov ntaub ntawv siv ultraviolet LED teeb qhov chaw raws li irradiation qhov chaw".
Raws li peb txhua tus paub, lub teeb pom kev zoo rau cov txheej txheem UV yog qhov nruab nrab - siab thiab siab - siab mercury teeb. Nyob rau hauv xyoo tas los no, tau tsav los ntawm kev txuag hluav taws xob thiab kev tiv thaiv ib puag ncig, ua ke nrog kev nce qib sai ntawm UVLED (ultraviolet LED) thev naus laus zis uas tau tso lub hauv paus rau kev lag luam - nplai daim ntawv thov, kev ua lag luam tau pom muaj kev nce ntxiv hauv UV- LED saws. Cov thev naus laus zis tshiab yeej ib txwm nyiam cov neeg nyiam thiab txaus siab. Txawm li cas los xij, raws li cov kws tshaj lij kev lag luam, kev nkag siab meej txog UV-LED yog qhov tseem ceeb. Ntawm no, peb xav qhia peb cov kev tshawb fawb hauv UV-LED teb nyob rau ob xyoos dhau los.
Kev hloov pauv hauv qhov chaw teeb pom kev zoo (qhov sib txawv ntawm LEDs thiab mercury teeb yuav raug piav qhia tom qab) tau ua rau muaj kev hloov pauv hauv UV txheej txheej txheej txheem nrog rau kev hloov pauv ntawm tag nrho cov txheej txheem txheej txheem thiab kho. Rau UV-LED system, peb txheeb xyuas tsib cov lus qhia tseem ceeb ntawm kev tshawb fawb txog kev ua lag luam thiab kev lag luam.
Kev tshawb fawb txog UV-LED Photocuring
Raws li tau hais ua ntej, UV-LED photocuring cia siab rauultraviolet LED teebqhov chaw kho cov ntaub ntawv UV. Yog li ntawd, kev ua tiav kev kho kom zoo yog lub hom phiaj tseem ceeb ntawm txhua qhov kev tshawb fawb. Photocuring yuav tsum muaj ob yam tseem ceeb: lub teeb (lub zog qhov chaw) thiab UV cov ntaub ntawv (cov receptor). Ib qho kev hloov pauv ntawm lub teeb pom kev tsis sib haum xeeb cuam tshuam qhov sib npaug ntawm tag nrho cov kab ke, nrog cov tub ntxhais dag hauv kev sib koom tes R&D kom ua raws li UV txheej nrog LED qhov chaw.
Nws tau lees paub tias qhov luv luv LED wavelengths sib haum mus rau qib siab zog thiab cov nqi siab dua. Hloov pauv, photoinitiators xav tau qis zog excitation feature ntev nqus wavelengths thiab tseem hais kom tus nqi siab dua. Qhov no tsim cov saw saw-zoo li kev sib raug zoo ntawm cov teeb pom kev zoo thiab cov neeg pib. Yog li, nthuav dav thaj tsam kev ua tau zoo ntawm ob qho tib si thiab txheeb xyuas qhov zoo sib npaug ntawm LED qhov chaw teeb pom kev zoo thiab cov khoom siv UV tau dhau los ua qhov tseem ceeb ntawm UV-LED R&D teg num.
Tshawb nrhiav ntawm LED Teeb Qhov Systems
Mercury teeb tshuab yog qhov paub tab ntawm kev txhim kho thiab kev siv, thiab tau ntev tau suav tias yog tus qauv teeb pom kev zoo. Hauv qhov sib piv, ultraviolet LED thev naus laus zis tseem nyob hauv nws cov me nyuam mos, khav theeb loj heev rau kev loj hlob yav tom ntej. Tsis tas li ntawd, LED kev lag luam saw yog qhov dav dav, suav nrog kev loj hlob siv lead ua, nti dicing, nti ntim, teeb pom kev zoo module kev koom ua ke, nrog rau kev tswj fais fab thiab hluav taws xob hluav taws xob tsim. Txhua theem ua rau muaj kev cuam tshuam loj heev rau qhov zoo ntawm cov khoom kawg- UVLED qhov chaw. Yog li ntawd, kev nkag siab thiab nthuav dav thaj tsam kev ua haujlwm ntawm LEDs yog qhov tseem ceeb rau kev nce qib ntawm tag nrho UV-LED ecosystem.
Qhov sib txawv ntawm LED teeb qhov chaw thiab Mercury Teeb (qhov zoo, qhov tsis zoo, thiab cov kev xav tsis zoo txog LEDs)
Txhawm rau kov yeej hauv kev sib tw ua lag luam, kev nkag siab zoo ntawm ob qho tib si nws tus kheej lub zog thiab cov neeg sib tw tsis muaj zog yog qhov tseem ceeb. Txij li thaum peb tsom los hloov cov teeb pom kev zoo ib txwm muaj nrog UVLEDs, nws yog qhov tseem ceeb rau thawj zaug piv ob lub thev naus laus zis thiab txheeb xyuas lawv qhov zoo, qhov tsis zoo, thiab kev txwv.
UV txheej kho vim photoinitiators nyob rau hauv lawv cov formulations nqus ultraviolet lub teeb ntawm tej wavelengths, tsim dawb radicals (los yog cations / anions) uas pib monomer polymerization. Txhawm rau piav qhia txog lub hauv paus ntsiab lus no, peb yuav xub kuaj xyuas qhov emission spectra ntawm mercury teeb thiab ultraviolet LEDs.
Daim ntawv qhia no yog ib qho classic thiab feem ntau pom kev sib piv ntawm emission spectra ntawm UV LEDs thiab mercury teeb. Raws li tuaj yeem pom los ntawm daim duab, qhov emission spectrum ntawm lub teeb mercury yog txuas ntxiv, ncua ntawm ultraviolet mus rau qhov infrared. Tshwj xeeb, lub teeb siv lub teeb yog concentrated hauv UVB kom luv -wave UVA band. Los ntawm qhov sib txawv, qhov emission spectrum ntawm LED yog qhov nqaim, nrog rau ob lub wavebands ntau tshaj plaws uas muaj lub ncov wavelengths ntawm 365 nm thiab 395 nm (xws li 385 nm, 395 nm, thiab 405 nm).
Tam sim no, qhov tseem ceebUV teebnrog rau kev lag luam siv tau poob rau hauv UVA band, tshwj xeeb tshaj yog cov teeb pom kev zoo ntawm LED nrog wavelengths ntawm 365 nm thiab 395 nm raws li tau piav qhia hauv daim duab 1. Nyob rau hauv qhov kev sib tw wavelength no, feem ntau cov photoinitiators muaj cov coefficients qis molar extinction coefficients. Yog li ntawd, UV- LED systems feem ntau raug kev txom nyem los ntawm kev pib ua haujlwm qis thiab inhibition oxygen hnyav, uas ua rau muaj kev puas tsuaj rau qhov chaw kho.
Lus Cim: Cov lus thov nquag ua los ntawm ntau lub tuam txhab UVLED lossis LED UV txheej lwm tus hais txog "zoo sandability ntawm LED UV txheej" yog, nruj me ntsis hais lus, ib qho txiaj ntsig ncaj qha ntawm qhov tsis txaus ntawm qhov chaw kho. Qhov kev sib tw tiag tiag tsis yog dag hauv kev ua tiav zoo sandability, tab sis nyob rau hauv kev ua kom tswj tau sandability - tawm tsam qhov sib npaug ntawm hnav tsis kam thiab yooj yim ntawm sanding. Tsis tas li ntawd, qee tus neeg tsim khoom siv rau kev dag ntxias: txhim kho lub teeb mercury qab ntawm LED array, qhov twg lub teeb mercury ua lub luag haujlwm tseem ceeb kho.
Uas tau hais tias, peb kuj tseem nco ntsoov tias nyob rau hauv 365 nm thiab 395 nm wavebands, LEDs xa cov teeb pom kev zoo dua li cov teeb mercury, uas ua rau kev sib sib zog nqus - txheej txheej ntawm UV cov ntaub ntawv.
(Rau kev siv, ntau cov txheej txheem UV kho cov kab ke suav nrog lub teeb gallium (nrog rau qhov tseem ceeb emission wavelength ntawm 415 nm) nrog rau cov teeb mercury, meej meej los txhim kho qhov sib sib zog nqus- txheej txheej kho kom zoo.)
Qhov no misconception feem ntau tshwm sim los ntawm qhov chaw uasTsuas yog 30% ntawm lub teeb emissions los ntawm mercury teeb yog ultraviolet (UV), whereas UVLEDs emit 100% UV teeb. Txawm li cas los xij, qhov tseeb txiav txim siab ntawm qhov system- theem kev siv hluav taws xob yog photoelectric hloov dua siab tshiab thiab ua haujlwm zoo lub teeb. Mercury teeb tiag tiag khav theeb siab photoelectric conversion efficiency-lawv qhov tsis txaus ntseeg nyob rau hauv qhov tseeb tias ib feem ntawm lub teeb emissions muaj pom thiab infrared rays, nrog UV teeb (tsuas yog ib feem tseem ceeb rau kho UV cov ntaub ntawv) accounting rau ib tug tsuas yog 30%. Hauv qhov sib piv, UVLEDs muaj qhov txo qis ntawm kev siv hluav taws xob hloov pauv hluav taws xob, tam sim no hovering nyob ib ncig ntawm 30% rau UVA wavelengths (uas yog kwv yees sib npaug rau UV lub teeb ua haujlwm ntawm cov teeb mercury).
Raws li txoj cai ntawm kev txuag hluav taws xob, qhov seem 70% ntawm hluav taws xob hluav taws xob hloov mus rau hauv cov cua sov. Qhov no piav txog ob qhov sib txawv tseem ceeb ntawm ob lub thev naus laus zis:
LEDs khwv tau lawv lub koob npe nrov li "qhov chaw txias txias" vim tias cov cua sov tsim tawm los ntawm sab nraum qab ntawm lub teeb vaj huam sib luag, tawm hauv lub teeb - tawm qhov chaw txias rau qhov kov. Conversely, mercury teeb radiate tshav kub rau pem hauv ntej los ntawm lawv cov reflectors thiab infrared emissions.
Qhov no yog vim li cas UVLED teeb pom kev zoo feem ntau xav tau huab cua- cov tshuab cua txias, thiab siab - lub zog UVLEDs txawm tias yuav tsum muaj dej- cov chav txias txias los tuav 70% ntawm lub teeb ci hluav taws xob rau lub teeb taub hau kub dissipation.
Lub zog tiag tiag-txuag qhov zoo ntawm LEDs yog los ntawm ob qhov tshwj xeeb: muaj peev xwm qhib / tawm tam sim thiab qhov tseeb irradiation ntawm kev tsim kho qhov muag, uas txhim kho lub teeb pom kev zoo. Txawm li cas los xij, kev siv cov txiaj ntsig no yuav tsum muaj kev koom ua ke nrog kev tshawb nrhiav infrared thiab kev tswj xyuas ntse- thev naus laus zis uas feem ntau UV LED cov cuab yeej tsim khoom lag luam tam sim no tsis muaj peev xwm R & D tsim.
Ozone Generation: Lawv emission spectrum suav nrog deb- ultraviolet lub teeb hauv qab 200 nm, uas ua rau muaj ntau ntawm ozone. (Qhov no yog lub hauv paus ua rau cov ntxhiab tsw phem tshaj tawm los ntawm cov neeg ua haujlwm hauv lub Hoobkas ua haujlwm mercury teeb tshuab.)
Mercury pollution los ntawm pov tseg: Mercury teeb muaj lub neej ua haujlwm luv ntawm 800-1000 teev. Kev pov tseg tsis raug ntawm cov teeb siv hluav taws xob ua rau muaj cov pa phem mercury thib ob, ib qho teeb meem uas tseem nyob rau niaj hnub no.
Cov ntawv ceeb toom qhia tias lub zog xav tau txhua xyoo los kho cov khib nyiab mercury yog sib npaug rau qhov sib xyaw ua ke ntawm ob lub Peb Gorges Dams. Qhov phem tshaj, tam sim no tsis muaj cuab yeej siv tau rau kev tshem tawm tag nrho cov mercury los ntawm cov kwj deg.
UV LEDs yog dawb kiag li los ntawm cov teeb meem no. Txij li thaum Minamata Convention on Mercury tau pib siv rau hauv Suav teb thaum Lub Yim Hli 16, 2017, theem - tawm ntawm cov roj mercury tau muab tso rau hauv cov txheej txheem tseem ceeb. Thaum lub Convention suav nrog kev zam rau kev lag luam mercury fluorescent teeb uas tsis muaj lwm txoj hauv kev, nws kuj tau hais tias cov neeg kos npe tuaj yeem thov ntxiv cov khoom lag luam no rau hauv cov npe txwv thaum muaj kev hloov pauv tau. Yog li, ncua sij hawm rau tag nrho theem- tawm ntawm mercury teeb nyob rau hauv UV curing daim ntaub ntawv hinges tag nrho ntawm cov thev naus laus zis nce qib thiab industrialization ntawm UV LED daws teeb meem.
Nws txhawb kev kho qhov tseeb hauv cheeb tsam rau kev siv xws li 3D luam ntawv.
Los ntawm kev sib koom ua ke LEDs nrog cov photoinitiators sib txawv, nws tso cai rau kev tswj xyuas meej txog kev kho cov qib thiab qhov tob.
Customizable Light Source ConfigurationLEDs feature modular teeb hlaws tsim, uas tso cai rau hloov kho qhov ntev, dav, thiab irradiation lub kaum ntse ntse. Qhov no versatility enables lub creation ntawm point light qhov chaw, kab teeb qhov chaw, thiab cheeb tsam lub teeb qhov chaw, tailored kom tau raws li cov kev cai ntawm ntau yam curing txheej txheem.
Lub teeb Source Parameter Requirements rau UV Material Curing
Lub wavelength:365 nm, 395 nm
Irradiance (Light Intensity, Optical Power Density): mW/cm²
Tag Nrho Cov Zog: mJ / cm²
Cov txheej txheem photocuring tsis tuaj yeem ua tsis tau yam tsis muaj peb qhov tseem ceeb uas tau hais los saum no: wavelength, lub teeb siv, thiab tag nrho lub zog noj.Wavelength txiav txim siab seb photoinitiators tuaj yeem qhib tau; Lub teeb siv zog dictates UV pib efficiency thiab ncaj qha cuam tshuam qhov chaw kho (oxygen inhibition tsis kam) thiab kev ua kom tob tob; thaum tag nrho lub zog koob tshuaj xyuas kom meej kho cov khoom.
Piv nrog mercury teeb, qhov zoo tshaj plaws ntawm LEDs yog nyob rau hauv lawv cov khoom tsim thiab tunable. Tsis pub dhau qhov kev txwv ntawm LED nws tus kheej, nws cov kev txwv tsis tuaj yeem ua kom zoo rau qhov loj tshaj plaws kom tau raws li cov cai tshwj xeeb. Hauv UV-LED photocuring thwmsim, lub hom phiaj tseem ceeb yog txhawm rau nthuav dav thaj tsam kev ua haujlwm ntawm ob qho tib si lub teeb ci thiab UV cov ntaub ntawv, thiab txheeb xyuas qhov zoo sib npaug ntawm lawv. Tshwj xeeb tshaj yog rau LEDs, qhov no txhais tau tias txiav txim siab qhov zoo tshaj plaws LED teeb qhov chaw tsis raws li cov txheej txheem txheej kom ua tiav cov txiaj ntsig zoo.
LED Luminescence Txoj Cai thiab Kev Txhim Kho Tam Sim No ntawm UVLED Chips
Raws li lub hauv paus ntsiab lus ntawm kev hloov hluav taws xob (cov ntsiab lus tshem tawm; cov neeg nyiam nyeem tuaj yeem xa mus rau cov kev pabcuam hauv online kom paub ntau ntxiv), thaum electrons hauv atom rov qab los ntawm lub xeev zoo siab mus rau hauv av, lawv tso tawm lub zog nyob rau hauv daim ntawv ntawm hluav taws xob sib txawv wavelengths (ie, emit electromagnetic nthwv dej ntawm txawv wavelengths).
Yog li ntawd, muaj ob txoj hauv kev los tsim UV-emitting lub teeb:
Thawj txoj hauv kev yog txhawm rau txheeb xyuas lub atom uas nws lub zog hluav taws xob sib txawv ntawm lub xeev zoo siab thiab lub xeev hauv av poob raws nraim hauv qhov ultraviolet spectrum. Cov teeb pom kev zoo mercury yog qhov siv ntau tshaj UV teeb qhov chaw raws li txoj cai no.
Qhov thib ob txoj hauv kev siv lub hauv paus ntsiab lus ntawm semiconductor luminescence (cov ntsiab lus tshem tawm; cov neeg nyeem txaus siab tuaj yeem xa mus rau cov chaw hauv online kom paub ntau ntxiv). Luv luv, thaum lub zog txuas ntxiv mus rau lub teeb-emitting semiconductor, qhov txhaj tshuaj los ntawm P- cheeb tsam mus rau N- cheeb tsam thiab electrons txhaj los ntawm N- cheeb tsam mus rau P- cheeb tsam recombine nrog electrons nyob rau hauv lub N - cheeb tsam {7} thaj tsam thiab micrometers nyob ze PN hlws ris, tsim spontaneous fluorescent hluav taws xob.
Raws li tau paub dav dav, qhov sib txawv ntawm pawg III -V cov khoom siv semiconductor xws li aluminium nitride mus rau gallium nitride los yog indium gallium nitride (InGaN) ntog nyob rau hauv lub spectrum ntawm xiav lub teeb rau ultraviolet lub teeb. Los ntawm kev kho cov khoom sib piv ntawm aluminium indium gallium nitride, peb tuaj yeem tsim ultraviolet thiab pom lub teeb pom kev thoob plaws ntau yam ntawm wavelengths.
Thaum theoretically, lub teeb ntawm txhua lub wavelength tuaj yeem tsim los ntawm kev kho cov khoom siv luminescent, qhov ntau ntawm UVLED chips muaj rau cov khoom lag luam tseem txwv vim muaj ntau yam kev txwv. High- cov chips fais fab uas tsim nyog rau cov ntawv thov kev lag luam yog qhov tseem ceeb hauv UVA band (365–415 nm). Nyob rau hauv xyoo tas los no, UVB thiab UVC thev naus laus zis kuj tau pom muaj kev txhim kho zoo, tab sis lawv tau raug txwv tsis pub muaj - lub zog rau pej xeem thiab cov neeg siv khoom lag luam xws li tshuaj tua kab mob thiab ua kom tsis muaj menyuam.
Muaj ntau qhov laj thawj tseem ceeb rau qhov no:
Crystal Material Structure txiav txim siab Luminous Efficiency (Photoelectric Conversion Efficiency) Gallium Nitride (GaN) thiab siab -efficiency Indium Gallium Nitride (InGaN) tseem tuaj yeem siv rau 365–405 nm ntau yam hauv UVA. Los ntawm qhov sib piv, UVB thiab UVC chips cia siab rau Aluminium Gallium Nitride (AlGaN) - cov khoom siv nrog cov khoom siv hluav taws xob tsis tshua muaj hluav taws xob- tsis yog siv GaN thiab InGaN ntau dua. Qhov no yog vim GaN thiab InGaN nqus ultraviolet lub teeb hauv qab 365 nm. Yog li ntawd, lub luminous efficiency ntawm UVB thiab UVC chips yog tsawg heev. Piv txwv li, LG's 278 nm nti muaj 2% photoelectric conversion efficiency.
Thaum tshav kub kub Dissipation Challenges tshwm sim los ntawm Tsawg Efficiency Raws li txoj cai ntawm kev txuag hluav taws xob, 2% photoelectric conversion efficiency txhais tau hais tias 98% ntawm hluav taws xob hluav taws xob hloov mus rau hauv tshav kub. Ntxiv mus, lub neej kev pab cuam thiab luminous efficiency ntawm LED chips yog inversely proportional rau kub. Xws li kev tsim hluav taws xob siab ua kom nruj heev rau cov cua sov dissipation systems. Nrog rau cov thev naus laus zis uas twb muaj lawm, nws tsuas yog tsis yooj yim sua kom ua tiav cov cua sov kom zoo rau siab - zog UVB thiab UVC chips.
Tsawg UV Transmittance ntawm ntim thiab Lens cov ntaub ntawv los tiv thaiv LED chips, encapsulation yog qhov tseem ceeb. Txij li thaum LEDs emit lub teeb omnidirectionally, lo ntsiab muag yuav tsum tau mloog zoo rau lub teeb beam. Txawm li cas los xij, sib nrug los ntawm quartz iav, feem ntau cov ntaub ntawv muaj UV xa tawm tsawg heev - thiab kev xa tawm poob qis heev thaum lub wavelength luv. Yog li ntawd, txawm tias qhov ua tau zoo ntawm UVB / UVC chips twb tsis tshua muaj, ib feem tseem ceeb ntawm lub teeb yog absorbed los ntawm lo ntsiab muag, uas ua rau lub teeb pom kev tsis muaj zog uas tsis tshua muaj txaus rau kev lag luam.
Tsawg Crystal Yield thiab Cov Nqi Ntau Lawm Tam sim no UVB thiab UVC chips yog tsim los siv tib lub reactors li UVA chips. Ntxiv nrog rau cov khoom siv tsis xws luag, cov teeb meem xws li mismatched thermal expansion coefficients ntawm lub substrate thiab siv lead ua ua rau tsis tshua muaj siv lead ua yields, uas nyob rau hauv lem ua kom cov nqi ntau lawm txwv tsis pub siab.
Zuag qhia tag nrho, vim qhov ua tau zoo ntawm cov luminous tsawg, cov nqi siab, thiab cov kev xav tau ntawm cov cua sov kom nruj ntawm UVB thiab UVC thev naus laus zis, kev txhim kho siab - lub zogUVB thiab UVC teebqhov chaw rau kev lag luam daim ntawv thov yuav nyob twj ywm tsis yooj yim mus txog rau thaum loj technological breakthroughs tiav.
Qhov tseem ceeb R & D tsom ntawm LED Teeb Qhov Systems
LED nti tsuas yog ib qho tseem ceeb ntawm lub teeb ci LED. Thaum ua R & D ntawm LED qhov chaw teeb pom kev zoo, peb yuav tsum tau txais ibsystematic,holistic mus kom ze. Tshaj li LED wavelength tuning, R & D Scope encompasses ib tug series ntawm downstream txheej txheem xws li ntim tshuab, kho qhov muag tsim, cua kub dissipation systems, fais fab mov systems, thiab ntse tswj systems.
Tam sim no, muaj plaub lub ntsiab ntim cov qauv rau LED chips:
Vertical Mount Structure
Tig-Chip Structure
Vertical Structure
3D Vertical Structure
Pa LED chips feem ntau txais yuav ib tug ntsug mount qauv nrog ib tug sapphire substrate. Cov qauv no nta ib qho yooj yim tsim thiab mature manufacturing txheej txheem. Txawm li cas los xij, sapphire muaj cov thermal conductivity tsis zoo, ua rau nws nyuaj rau cov cua sov uas tsim los ntawm cov nti kom hloov mus rau lub dab dej kub - ib qho kev txwv uas txwv nws daim ntawv thov nyob rau hauv siab - fais fab LED systems.
Flip-chip ntim yog ib qho ntawm cov kev txhim kho tam sim no. Tsis zoo li cov qauv ntsug mount, cua sov hauv flip-chip designs tsis tas yuav dhau los ntawm nti lub sapphire substrate. Hloov chaw, nws raug xa mus ncaj qha rau cov substrates nrog cov thermal conductivity ntau dua (xws li silicon lossis ceramic) thiab tom qab ntawd dissipated rau hauv ib puag ncig sab nraud ntawm lub hauv paus hlau. Tsis tas li ntawd, txij li flip-chip cov qauv tshem tawm qhov xav tau rau cov xov hlau kub sab nraud, lawv ua kom cov nti sib xyaw ua ke ntau dua thiab txhim kho lub zog kho qhov muag hauv ib cheeb tsam. Uas tau hais tias, ob qho tib si ntsug mount thiab ntxeev-chip cov qauv qhia ib qho kev tsis haum: LED's P thiab N electrodes nyob rau tib sab ntawm lub nti. Qhov no ua rau tam sim no ntws kab rov tav los ntawm n-GaN txheej, ua rau cov neeg coob coob tam sim no, muaj cua sov hauv zos, thiab thaum kawg txwv qhov pib ntawm lub zog tsav tam sim no.
Vertical- qauv xiav- teeb chips hloov zuj zus los ntawm ntsug mount tshuab. Hauv qhov kev tsim no, cov pa sapphire -substrate nti yog flipped thiab khi rau ib tug heev thermally conductive substrate, ua raws li los ntawm laser nqa- tawm ntawm lub sapphire substrate. Cov qauv no muaj txiaj ntsig zoo hais txog cov cua sov dissipation bottleneck, tab sis koom nrog cov txheej txheem tsim khoom nyuaj - tshwj xeeb tshaj yog cov kauj ruam nyuaj rau kev hloov pauv substrate - uas ua rau cov khoom qis qis. Txawm li cas los xij, nrog rau kev siv thev naus laus zis, kev ntim ntsug rau UV LEDs tau dhau los ua neeg paub tab.
Ib qho tshiab 3D ntsug qauv tau tsis ntev los no tau thov. Muab piv rau cov kab ntsug ntsug- qauv LED chips, nws cov txiaj ntsig tseem ceeb suav nrog kev tshem tawm cov xov hlau sib txuas, ua kom cov pob ntawv nyias nyias, ua kom cov cua sov ua kom zoo dua qub, thiab kev sib koom ua ke yooj yim ntawm cov tsav tam sim no. Txawm li cas los xij, ntau yam kev sib tw yuav tsum tau kov yeej ua ntej 3D ntsug qauv tuaj yeem ua lag luam.
Muab hais tias UVLEDs feem ntau pom muaj qhov ua haujlwm qis dua piv rau cov teeb pom kev dav dav LEDs, ntim cov qauv ntsug yog qhov kev xaiv zoo tshaj plaws los ua kom lub teeb pom kev zoo tshaj plaws.
Txij li thaum LEDs emit lub teeb omnidirectionally, thiab lawv cov inherent luminous efficiency twb tsis tshua muaj, scientific thiab rational optical tsim yuav tsum tau txhim khu lub teeb efficiency (ie, lub teeb efficiency ntawm frontal irradiation). Cov khoom siv kho qhov muag pom muaj xws li cov iav tsom iav, cov lo ntsiab muag thawj, thiab cov lo ntsiab muag thib ob.
Tsis tas li ntawd, lub teeb ultraviolet undergoes siab attenuation thaum dhau los ntawm kev tshaj tawm. Yog li, ntau yam yuav tsum raug soj ntsuam thaum xaiv cov khoom siv lo ntsiab muag-xws li quartz iav, borosilicate iav, thiab tempered iav- nrog rau qhov tseem ceeb rau cov ntaub ntawv uas muaj UV transmittance siab. Qhov no tsis tsuas yog ua kom lub teeb pom kev zoo xwb tab sis kuj tseem tiv thaiv qhov kub thiab txias ntau dhau los ntawm cov khoom siv teeb pom kev zoo nyob rau hauv lub sijhawm ntev UV raug.
Raws li tau hais dhau los, raws li txoj cai ntawm kev txuag hluav taws xob, tsuas yog ib feem ntawm hluav taws xob hluav taws xob hloov mus rau lub teeb lub zog, thaum feem ntau yog dissipated li cua sov. Rau UVA band, lub zog hloov pauv hloov pauv yog 10: 3: 7 rau hluav taws xob, lub teeb, thiab cua sov feem. Lub neej ua haujlwm zoo ntawm LED chips yog sib raug zoo nrog lawv qhov kub thiab txias. Nyob rau hauv cov txheej txheem photocuring, siab optical zog ceev feem ntau yuav tsum siab -kev sib xyaw ua ke ntawm LED chips, uas imposes nruj yuav tsum tau rau cov cua kub dissipation systems.
Yog li, ua tiav cov cua kub kom zoo thiab ua kom ntseeg tau tias qhov sib txuas ntawm txhua qhov LED chips tseem nyob rau hauv qhov tsim nyog thiab sib npaug ntau yam yuav tsum tau tsim kev tshawb fawb nruj, kev simulation hauv computer, thiab kev sim ua haujlwm.
Kev tshawb fawb txog UV txheej txheej
Cov kev txwv ntawm Photoinitiators & A System- theem Kev Ua Haujlwm rau Resin thiab Monomer ReactivityAs raws li tau piav qhia hauv cov lus qhia ua ntej rau LED thev naus laus zis, siab - lub zog LED lub teeb qhov chaw tsim nyog rau cov ntawv thov kev lag luam tam sim no raug kaw rau UVA band, tshwj xeeb wavelengths saum 365 nm. Tau txiav txim siab txog kev ua tau zoo ntawm LED qhov chaw teeb pom kev zoo, tam sim no peb tuaj yeem pom tias kev xaiv cov photoinitiators sib xws yog txwv tsis pub, vim tias feem ntau cov photoinitiators pom qhov qis qis molar extinction coefficients ntawm wavelengths saum 365 nm.
Txhawm rau daws qhov teeb meem ntawm kev pib ua haujlwm qis ntawm LED-tshaj photoinitiators, R&D kev siv zog yuav tsum tsis txhob txwv rau photoinitiators lawv tus kheej. Hloov chaw, peb yuav tsum tau txais ib qho system- theem kev pom uas sib koom ua ke cov resins, monomers, photoinitiators thiab txawm tias cov khoom siv ntxiv rau hauv ib qho kev tshawb fawb holistic, yog li txhim kho kev kho kom zoo ntawm LED UV systems.
Formulation Design and Coating Process Development for LED Curing (Kev cuam tshuam ntawm Photoinitiators, Resins, Monomers, Temperature, Surface Dryness, Los ntawm Dryness, Pigments thiab Fillers) Txhawm rau txhim kho qhov nqus ntawm qhov ntev - wavelength UV teeb los ntawm photoinitiators, feem ntau yuav tsum muaj cov phosphoric acid, nitrogen thiab lwm yam benzene (Nitrogen) nyob rau hauv lawv cov qauv molecular. Thaum qhov kev hloov kho no txhim kho qhov ntev - wavelength UV nqus, nws kuj ua rau muaj xim ntxiv ntawm photoinitiators.
Tsis tas li ntawd, vim lub teeb tsis pom kev ua haujlwm ntawm cov neeg pib no, ntau qhov ntau ntawm cov reactive resins thiab monomers ntau heev -feem ntau siab -functionality acrylic resins thiab monomers- yuav tsum tau ntxiv kom ceev cov tshuaj tiv thaiv tag nrho ntawm cov txheej txheem txheej. Txawm li cas los xij, txoj hauv kev no nyiam tsim cov coatings nrog cov hardness siab tab sis tsis yooj yim, uas txwv lawv cov kev siv ntau yam.
Uas tau hais tias, feem ntau cov molar extinction coefficients ntawm LED UV photoinitiators kuj muaj qhov tshwj xeeb kom zoo dua: lawv tso cai rau UV hluav taws xob ntau dua los ntawm txheej txheej, uas yog qhov tsim nyog rau kev sib sib zog nqus ntawm cov yeeb yaj kiab tuab.
Txheej kev ua tau zoo yuav tsum muaj rau txawv cia, tsheb thauj mus los, kev tsim kho thiab daim ntawv thov txheej txheem nyob rau hauv lub txheej txheej kev lag luam, ntau yam kev siv cov txheej txheem xws li cov menyuam txheej, tshuaj tsuag txheej thiab curtain txheej impose nyias viscosity yuav tsum tau rau coatings. Meanwhile, sib txawv substrates xav kom tailored txheej zog nyob rau hauv cov nqe lus ntawm wettability thiab adhesion. Tsis tas li ntawd, qhov sib txawv ntawm kev thauj mus los thiab kev cia khoom yuav tsum muaj cov qib sib txuam ntawm kev ruaj khov rau cov txheej txheej. Yog li ntawd, tag nrho cov teeb meem no yuav tsum tau txiav txim siab tag nrho thaum lub sij hawm txheej txheej tsim.
Txheej zaj duab xis Kev ua tau zoo xav tau rau ntau yam kev siv Daim ntawv thov sib txawv ua kom muaj kev ua tau zoo sib txawv ntawm cov yeeb yaj kiab txheej, suav nrog glossiness, colorimetric zog, hardness, yooj, abrasion kuj thiab cuam tshuam. Yog li ntawd, kev txhim kho txheej txheej yuav tsum muaj qhov sib npaug ntawm kev kho kom zoo thiab kev ua yeeb yaj kiab.
Kev tshawb fawb txog txheej txheej txheej txheej
Txheej txheej yog txheej txheem engineering. Kev ua kom zoo txheej txheem txheej txheem tuaj yeem nthuav dav daim ntawv thov ciam teb ntawm UV-LED thev naus laus zis. Raws li kev lag luam hais mus,"Peb qhov chaw cia siab rau cov txheej txheem; xya ntu nyob ntawm cov txheej txheem thov". Thaum kawg, ob qho tib si txheej thiab lub teeb ci ua tiav lawv qhov kev xav tau tsuas yog los ntawm kev thov kom raug.
Ntxiv mus, optimizing txheej txheej txheem nrog UV txheej thiab LED qhov chaw teeb pom kev zoo tuaj yeem ua rau muaj txiaj ntsig zoo rau cov kev txwv ntawm ob qho tib si cov ntaub ntawv thiab lub teeb ci. Piv txwv li, cua sov tuaj yeem txo qhov viscosity ntawm siab -resin- cov ntsiab lus coatings uas muaj kuab heev ntawm chav tsev kub, ua rau lawv haum rau ntau txoj kev thov. Tsis tas li ntawd, cua sov tuaj yeem txhim kho qhov dej ntawm cov txheej txheem txheej txheem, txhim khu kev ua haujlwm molecular, ua kom tiav cov txheej txheem kev kho kom zoo dua qub thiab ua kom cov yeeb yaj kiab zoo dua.
Tshawb nrhiav ntawm Upstream thiab Downstream Industry Chains
Ob xyoos dhau los, qhov tsis txaus thiab skyrocketing tus nqi ntawm photoinitiators tshwm sim los ntawm kev tiv thaiv ib puag ncig tau ua rau muaj kev puas tsuaj rau cov lag luam hauv qab thiab cuam tshuam loj heev rau kev txhim kho LED UV thev naus laus zis. Qhov no underscores tias kev sib txuas ntawm kev lag luam nce toj thiab qis qis thiab kev ua kom zoo ntawm cov khoom siv saw hlau yog qhov tseem ceeb lav rau kev noj qab haus huv ntawm kev lag luam thiab kev ua lag luam ua tiav ntawm nws cov khoom thiab thev naus laus zis.
Txawm hais tias muaj ntau yam kev lag luam hloov zuj zus los ntawm kev kos los ntawm kev sib koom ua ke ntawm kev tsim kho thev naus laus zis, kev tsim kho kev lag luam thiab kev xav tau nce siab, cov yam ntxwv no yuav tsum tau soj ntsuam tag nrho thaum lub sijhawm ua lag luam.
Tsis tas li ntawd, los ntawm kev xav txog kev nqis peev, kev tshawb fawb txog thiab siv cov kev lag luam sab saud thiab qis qis tuaj yeem tsis tsuas yog ua kom cov khoom ruaj khov thaum cov khoom nkag mus rau hauv kev ua lag luam, tab sis kuj ua rau cov tuam txhab koom nrog cov nyiaj tau los ntawm kev lag luam loj hlob.
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