Kev soj ntsuam ntawm LED Teeb Bead Discoloration Ua rau thiab Kev Tiv Thaiv Kev Ntsuas
Raws li lub cim thib plaub ntawm cov teeb pom kev ntsuab ntsuab, LEDs tau siv dav hauv cov teeb pom kev zoo, cov teeb pom kev zoo nkauj, cov khoom siv hluav taws xob hauv tsheb, thiab lwm yam. Txawm li cas los xij, thaum siv, LED teeb hlaws hlaws feem ntau muaj kev hloov xim, ua rau txo qis luminous efficiency, xim kub hloov, thiab degraded lub teeb pom kev zoo, cuam tshuam rau cov khoom lifespan thiab kev ntseeg siab. Raws li kev tshawb fawb ntawm Cai Yingying thiab lwm tus, tsab xov xwm no tau txheeb xyuas lub hauv paus ua rau LED teeb hlaws discoloration thiab tawm tswv yim txog kev tiv thaiv.
I. Basic Structure ntawm LED Teeb Bead
Ib tug raug LED teeb hlaws (siv a3528 dawb LED ua piv txwv) feem ntau muaj cov hauv qab no:
LED Chip: Lub teeb -emitting core, ua electro-optical conversion ntawm PN hlws ris.
Bonding Wires: Hlau xov hlau txuas cov nti rau cov coj.
Tuag-Txuas Adhesive: Txhim kho cov nti rau ntawm cov hlau lead.
Phosphor: Ua kom muaj kev hloov pauv wavelength, piv txwv li, sib xyaw xiav - lub teeb daj zoo siab los tsim lub teeb dawb.
Encapsulant: Tiv thaiv cov nti thiab phosphor, feem ntau yog ua los ntawm epoxy resin lossis silicone.
Lead Ncej: Txhawb cov nti thiab ua haujlwm raws li cov qauv hluav taws xob conduction, feem ntau ua los ntawm cov nyiaj -plated tooj liab.
Kev txawv txav ntawm ib qho ntawm cov khoom no tuaj yeem ua rau tsis muaj xim tsis ua haujlwm ntawm tag nrho cov hlaws teeb.
II. Lub ntsiab ua rau LED teeb hlaws Discoloration
1. Teeb meem nrog Encapsulant
(1) Txawv teb chaws Matter Residue nyob rau hauv lub Encapsulant
Yog hais tias txawv teb chaws impurities yog tov rau hauv lub encapsulant thaum lub sij hawm ntau lawm txheej txheem, nws yuav ua rau lub zos discoloration. Nyob rau hauv ib rooj plaub, cov khoom txawv teb chaws dub tau pom nyob rau hauv lub encapsulant, nrog SEM & EDS tsom xam qhia nws lub ntsiab Cheebtsam yog Al, C, thiab O. Cov impurities no tuaj yeem los ntawm cov plua plav hauv qhov chaw tsim khoom, cov khoom hnav cov khoom, lossis cov khoom siv raw khoom. Cov teeb meem txawv teb chaws hloov lub teeb lub refraction thiab kis tau tus mob, ua rau lub zos tsaus ntuj nti los yog discoloration.
(2) Tshuaj Erosion ua rau Encapsulant Discoloration
Yog tias lub teeb ci LED hlaws tau raug rau qee yam tshuaj tsis haum rau hauv nws qhov chaw siv, lub encapsulant yuav raug tshuaj lom neeg thiab tsis muaj xim. Piv txwv li:
Nyob rau hauv lub iav raj lub teeb, ib qho - ib feem ntawm chav tsev kub vulcanized (RTV) silicone roj hmab tau siv los kho LED sawb. Cov leej faj- muaj roj volatilized thaum kho ua rau theem nrab vulcanization ntawm LED encapsulant, tig daj.
TGA tsom xam pom tias qhov ntsuas kub ntawm qhov kub ntawm qhov tsis ua tiav encapsulant yog tshaj 25℃siab dua li cov qauv ib txwm, qhia tias muaj kev sib tshuam - txuas cov tshuaj tiv thaiv tau tshwm sim.
ICP-OES tau tshawb pom txog 400 ppm ntawm sulfur nyob rau hauv kho cov nplaum, lees tias leej faj yog lub hauv paus ua rau tsis muaj xim.
Kev pom zoo: Thaum lub sij hawm tsim khoom, ntsuas qhov sib xws ntawm tag nrho cov ntaub ntawv sib cuag thiab tsis txhob siv cov khoom siv uas muaj cov khoom siv reactive xws li sulfur lossis chlorine.
2. Phosphor Sedimentation
Kev faib tawm tsis sib xws ntawm phosphor nyob rau hauv lub encapsulant tuaj yeem ua rau xim kub hloov thiab hloov xim hauv zos. Nyob rau hauv ib rooj plaub, LED teeb hlaws dai nyob rau hauv ib lub warehouse hloov los ntawm txiv kab ntxwv mus rau lub teeb daj. Analysis qhia:
Pob tshab particle teeb meem tau pom nyob rau ntawm cov hlau lead thav duab ntawm cov hlaws ua tsis tiav. Kev txheeb xyuas qhov sib xyaw pom tau tias muaj Strontium (Sr), Barium (Ba), thiab lwm yam, uas yog los ntawm silicate -raws li phosphor.
Cov hlau lead thav duab ntawm cov hlaws ib txwm yog huv si, muaj cov nyiaj thiab cov pa roj carbon tsawg xwb.
Phosphor sedimentation hloov txoj kev teeb, ua rau dispersion thiab xim txawv txav.
Cov lus pom zoo:
Optimize tus piv thiab viscosity ntawm phosphor thiab encapsulant.
Txhim kho cov txheej txheem dispensing thiab kho kom tsis txhob muaj sedimentation.
Xaiv cov khoom siv phosphor nrog zoo adhesion zog.
3. Lead Frame Teeb meem
(1) Lead Frame Surface Contamination
Thaum lub sij hawm SMT txheej txheem, ntau solder (xws li, tin - txhuas alloy) tuaj yeem wick up pins mus rau cov hlau lead thav duab nto, tsim ib txheej txheej. Nyob rau hauv ib rooj plaub, Sn thiab Pb cov ntsiab lus tau kuaj pom ntawm cov kab hlau lead ntawm cov hlaws tsis muaj xim, paub meej tias kev sib kis kab mob. Cov hlau txheej no hloov lub teeb pom kev zoo, ua rau pom kev tsis pom kev.
(2) Lead Ncej Corrosion
Yog hais tias cov nyiaj plating ntawm cov hlau lead tuaj rau hauv kev sib cuag nrog cov ntsiab lus corrosive xws li sulfur lossis chlorine, tshuaj lom neeg tshwm sim, tsim cov tshuaj tsaus xws li nyiaj sulfide lossis nyiaj chloride. Hauv qhov teeb meem tsis ua haujlwm:
Cov hlau lead thav duab saum npoo blackened, thiab EDS pom cov ntsiab lus sulfur siab.
Cov nyiaj plating pom qhov xoob, corroded morphology.
Corrosion tuaj yeem nrawm nyob rau hauv qhov kub thiab txias thiab cov av noo siab.
Qhov chaw ntawm Corrosion:
Impurities nyob rau hauv cov ntaub ntawv lawv tus kheej.
Kev sib kis tau qhia thaum lub sijhawm tsim khoom.
Muaj cov corrosive gases nyob rau hauv ib puag ncig siv.
(3) Tsis zoo ntawm Lead Frame Plating
Qhov zoo ntawm plating ncaj qha txiav txim siab corrosion kuj thiab reflectivity ntawm cov hlau lead ncej. Nyob rau hauv ib rooj plaub, lub discoloration tus nqi ntawm lub teeb hlaws mus txog 30% tom qab laus. Analysis pom:
Lub plating ntawm cov hlau lead ua tsis tau zoo yog xoob thiab ntxeem tau.
AES tsom xam pom cov npib tsib xee rau ntawm cov nyiaj txheej txheej, qhia tias muaj qhov sib txawv ntawm cov nickel hauv qab txheej.
Lub hauv paus ua rau yog tsis sib xws plating thickness thiab tsis - ntom qauv.
Hom Plating Structure: Copper substrate → Nickel plating (barrier txheej) → Silver plating (reflective txheej). Tsis zoo plating zoo yooj yim ua rau nickel diffusion thiab blackening ntawm cov nyiaj txheej.
III. Kev Tiv Thaiv Kev Ntsuas thiab Kev Txhim Kho Cov Lus Qhia
1. Kev xaiv cov khoom siv thiab kev ntsuas kev sib haum xeeb
Xaiv hom encapsulant resistant rau vulcanization thiab yellowing.
Xaiv phosphors uas tsis muaj sedimentation thiab siab stability.
Xyuas kom cov hlau lead plating ua tau raws li cov qauv rau qhov ntom ntom, sib xws, thiab tsis muaj qhov tsis xws luag -dawb.
2. Txheej txheem tswj
Ua kom huv huv hauv qhov chaw ntim khoom kom tsis txhob muaj kev cuam tshuam txawv teb chaws.
nruj me ntsis tswj tus nqi ntawm solder paste nyob rau hauv lub vuam txheej txheem los tiv thaiv wicking.
Optimize curing kub thiab lub sij hawm los tiv thaiv residual volatile tshuaj.
3. Lead Ncej Kev Txhim Kho Zoo
Xaiv corrosion-cov ntaub ntawv tiv taus, xws li siab-purity tooj liab alloys.
Xyuas kom cov txheej txheem electroplating tshwm sim nyob rau hauv tuab, uniformly tuab txheej.
Siv cov tshuaj tiv thaiv-tarnish rau cov nyiaj plating (xws li, tiv thaiv txheej).
4. Kev tsim khoom thiab siv kev tswj hwm ib puag ncig
Tsis txhob sib cuag ntawm LEDs thiab cov khoom uas muaj leej faj los yog chlorine, xws li cov nplaum los yog cov ntsaws ruaj ruaj.
Txhim khu kev sib khi thiab kev tiv thaiv thaum siv nyob rau hauv qhov kub thiab txias ib puag ncig.
Ua cov kev ntsuam xyuas kev laus kom nrawm txhawm rau txheeb xyuas qhov muaj feem cuam tshuam rau kev puas tsuaj thaum ntxov.
IV. Xaus
LED teeb hlaws discoloration tshwm sim los ntawm ntau yam ua yeeb yam ua ke. Cov laj thawj tseem ceeb suav nrog:
Encapsulant Abnormalities: Txawv teb chaws teeb meem suav nrog, tshuaj erosion.
Phosphor Sedimentation: Kev faib tawm tsis sib xws ua rau muaj kev tawg.
Lead Frame Teeb meem: Kev sib kis, corrosion, tsis zoo plating.
Los ntawm kev xaiv cov khoom nruj, kev tswj cov txheej txheem, thiab kev tshuaj xyuas zoo, LED teeb hlaws discoloration tuaj yeem tiv thaiv tau zoo, txhim kho cov khoom lag luam. Nyob rau hauv lub neej yav tom ntej, raws li LEDs txhim kho mus rau siab dua lub zog thiab kev ua tau zoo, cov kev xav tau ntawm cov khoom ntim thiab cov txheej txheem yuav ua kom nruj dua, yuav tsum tau ua kom zoo dua qub thiab txhim kho kev tsim kho.
Tsab ntawv xov xwm no tau hloov kho los ntawm Cai Yingying's "Kev Tshawb Fawb Txog Kev Tshawb Fawb Txog Kev Tsis Txaus Siab ntawm LED Teeb Bead" rau kev sib pauv thiab siv. Kev siv tswv yim yuav tsum muaj kev ntsuam xyuas raws li cov khoom tshwj xeeb thiab cov txheej txheem.
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