LED, tseem hu ua plaub tiam teeb pom kev zoo los yog lub teeb ntsuab, muaj cov yam ntxwv ntawm kev txuag hluav taws xob, kev tiv thaiv ib puag ncig, kev ua neej ntev, thiab me me. Nws yog dav siv nyob rau hauv ntau yam xws li qhia, zaub, kho kom zoo nkauj, backlight, dav teeb pom kev zoo, thiab nroog hmo ntuj scenes. Raws li kev siv sib txawv, nws tuaj yeem muab faib ua tsib pawg: cov ntaub ntawv qhia, teeb liab teeb, tsheb teeb pom kev zoo, LCD npo backlight, thiab teeb pom kev zoo.
Cov teeb pom kev zoo ntawm LED muaj qhov tsis zoo xws li qhov ci tsis txaus, uas ua rau tsis muaj koob meej. Lub hwj chim hom LED teeb muaj qhov zoo xws li lub teeb ci siab thiab lub neej ua haujlwm ntev, tab sis lawv muaj kev nyuaj xws li ntim khoom. Hauv qab no yog ib qho kev ntsuam xyuas luv luv ntawm cov yam ntxwv uas cuam tshuam rau lub teeb sau kev ua haujlwm ntawm lub hwj chim hom LED ntim.

1. Thaum tshav kub kub dissipation technology
Rau lub teeb-emitting diodes muaj li ntawm PN junctions, thaum pem hauv ntej tam sim no ntws los ntawm PN hlws ris, PN junction muaj kev poob cua sov. Cov cua sov no yog radiated rau hauv cov huab cua los ntawm cov nplaum, cov ntaub ntawv encapsulation, cov dab dej kub, thiab lwm yam. Thaum lub sij hawm tus txheej txheem no, txhua feem ntawm cov khoom muaj ib tug thermal impedance uas tiv thaiv tshav kub ntws, hu ua thermal kuj. Thermal resistance yog tus nqi ruaj khov txiav txim siab los ntawm qhov loj, qauv, thiab cov khoom siv ntawm lub cuab yeej.
Piv txwv tias qhov thermal tsis kam ntawm lub teeb-emitting diode yog Rth (℃ / W) thiab cov hluav taws kub dissipation yog PD (W), qhov kub thiab txias ntawm PN hlws ris tshwm sim los ntawm qhov kub ntawm qhov tam sim no:
T (℃) = Rth&Tims; PD
PN junction kub yog:
TJ=TA+Rth&Tims; PD
Ntawm lawv, TA yog qhov kub thiab txias. Vim qhov nce hauv qhov kub thiab txias, qhov tshwm sim ntawm PN junction luminescence recombination txo, ua rau txo qis ntawm qhov ci ntawm lub teeb-emitting diode. Lub caij no, vim qhov nce hauv qhov kub thiab txias tshwm sim los ntawm kev poob cua sov, qhov ci ntawm lub teeb-emitting diode yuav tsis txuas ntxiv mus ntxiv nrog rau tam sim no, qhia txog qhov tshwm sim ntawm thermal saturation. Tsis tas li ntawd, raws li qhov sib txuas kub nce, lub ncov wavelength ntawm lub teeb emitted kuj yuav hloov mus rau qhov ntev wavelengths, txog 0.2-0.3 nm / ℃. Rau cov LEDs dawb uas tau los ntawm kev sib xyaw YAG fluorescent hmoov coated nrog xiav lub teeb chips, lub drift ntawm xiav lub teeb wavelength yuav ua rau ib tug mismatch nrog lub excitation wavelength ntawm cov fluorescent hmoov, yog li txo tag nrho cov luminous efficiency ntawm dawb LEDs thiab ua rau kev hloov nyob rau hauv lub teeb xim dawb. kub.
Rau lub hwj chim lub teeb-emitting diodes, tus tsav tam sim no feem ntau yog ob peb puas milliamps los yog ntau tshaj, thiab tam sim no qhov ceev ntawm PN junction yog siab heev, yog li qhov kub nce ntawm PN junction tseem ceeb heev. Rau kev ntim khoom thiab kev siv, yuav ua li cas txo cov thermal tsis kam ntawm cov khoom kom cov cua sov tsim los ntawm PN hlws ris yuav dissipated sai li sai tau tsis tsuas yog txhim kho cov saturation tam sim no thiab luminous efficiency ntawm cov khoom, tab sis kuj txhim khu kev ntseeg tau thiab lifespan ntawm cov khoom. Txhawm rau txo cov thermal tsis kam ntawm cov khoom, kev xaiv cov khoom ntim yog ib qho tseem ceeb tshwj xeeb, nrog rau cov khoom siv hluav taws xob, cov nplaum, thiab lwm yam. Cov thermal tsis kam ntawm txhua cov khoom yuav tsum tsawg, uas yuav tsum tau thermal conductivity zoo. Qhov thib ob, tus qauv tsim yuav tsum tsim nyog, nrog kev sib txuam ntawm thermal conductivity ntawm cov ntaub ntawv thiab kev sib txuas zoo thermal ntawm cov ntaub ntawv kom tsis txhob muaj cua sov dissipation bottlenecks nyob rau hauv cov thermal channel thiab xyuas kom sov dissipation ntawm sab hauv mus rau txheej txheej. Nyob rau tib lub sijhawm, nws yog ib qho tsim nyog los xyuas kom meej los ntawm cov txheej txheem uas cov cua sov yog dissipated raws sij hawm raws li lub pre-tsim cua sov dissipation raws.

2. Kev xaiv cov nplaum nplaum
Raws li txoj cai ntawm refraction, thaum lub teeb yog tshwm sim los ntawm ib tug ntom nruab nrab mus rau ib tug sparse nruab nrab, tag nrho emission tshwm sim thaum qhov teeb meem lub kaum sab xis mus txog ib tug tej yam nqi, uas yog, ntau dua los yog sib npaug rau lub kaum sab xis tseem ceeb. Rau GaN xiav chips, lub refractive index ntawm GaN khoom yog 2.3. Thaum lub teeb tawm ntawm sab hauv ntawm cov siv lead ua rau saum huab cua, raws li txoj cai ntawm refraction, lub kaum sab xis tseem ceeb θ 0 = sin-1 (n2 / n1).
Ntawm lawv, n2 yog sib npaug rau 1, uas yog lub refractive index ntawm huab cua, thiab n1 yog lub refractive index ntawm GaN. Yog li ntawd, lub kaum sab xis tseem ceeb θ 0 yog xam los ntawm 25.8 degrees. Nyob rau hauv cov ntaub ntawv no, tsuas yog lub teeb uas yuav emissions yog lub teeb nyob rau hauv lub spatial khoom lub kaum sab xis ntawm ≤ 25.8 degrees. Raws li cov lus ceeb toom, qhov kev ua haujlwm sab nraud ntawm GaN chips yog tam sim no nyob ib puag ncig 30% -40%. Yog li ntawd, vim yog kev nqus sab hauv ntawm cov nti siv lead ua, qhov sib faib ntawm lub teeb uas tuaj yeem tawm sab nraud ntawm cov siv lead ua yog tsawg heev. Raws li cov lus ceeb toom, qhov kev ua haujlwm sab nraud ntawm GaN chips yog tam sim no nyob ib puag ncig 30% -40%. Ib yam li ntawd, lub teeb tawm los ntawm cov nti yuav tsum dhau los ntawm cov khoom ntim thiab xa mus rau qhov chaw, thiab qhov cuam tshuam ntawm cov khoom ntawm lub teeb pom kev zoo kuj yuav tsum tau xav txog.
Yog li ntawd, txhawm rau txhim kho lub teeb sau ua tau zoo ntawm N2, uas yog tsim nyog yuav tsum tau nce tus nqi ntim khoom, txhawm rau nce qhov tseem ceeb lub kaum sab xis ntawm cov khoom thiab yog li txhim kho lub ntim luminous efficiency ntawm cov khoom. Nyob rau tib lub sijhawm, cov khoom siv encapsulation yuav tsum muaj tsawg dua qhov nqus ntawm lub teeb. Yuav kom nce qhov feem pua ​​​​ntawm cov teeb pom kev zoo, nws yog qhov zoo tshaj kom muaj ib qho arched lossis hemispherical zoo rau lub ntim. Txoj kev no, thaum lub teeb tawm los ntawm cov khoom ntim rau hauv cov huab cua, nws yuav luag perpendicular mus rau lub interface thiab tsis dhau tag nrho cov kev xav.

3. Kev xav ua haujlwm
Muaj ob yam tseem ceeb ntawm kev xav txog kev kho mob: ib qho yog kev kho mob hauv cov nti, thiab lwm qhov yog qhov kev xav ntawm lub teeb los ntawm cov khoom ntim. Los ntawm kev kho mob sab hauv thiab sab nraud, qhov feem ntawm lub teeb tawm ntawm sab hauv lub nti yog nce, qhov nqus hauv cov nti raug txo, thiab qhov ua tau zoo ntawm cov khoom siv hluav taws xob LED tau txhim kho. Nyob rau hauv cov nqe lus ntawm ntim, lub hwj chim hom LEDs feem ntau sib sau ua ke hwj chim hom chips ntawm hlau brackets los yog substrates nrog reflective kab noj hniav. Lub bracket hom reflective kab noj hniav feem ntau yog plated los txhim kho cov nyhuv reflection, thaum lub substrate hom reflective kab noj hniav feem ntau polished thiab tej zaum yuav undergo electroplating kev kho mob yog hais tias tej yam kev mob tso cai. Txawm li cas los xij, ob txoj kev kho mob saum toj no raug cuam tshuam los ntawm pwm raug thiab txheej txheem, thiab cov txheej txheem ua kom pom cov kab noj hniav muaj qee qhov cuam tshuam, tab sis nws tsis zoo tagnrho. Tam sim no, nyob rau hauv zus tau tej cov substrate hom reflective kab noj hniav nyob rau hauv Tuam Tshoj, vim tsis txaus polishing raug los yog oxidation ntawm hlau coatings, lub reflection nyhuv yog tsis zoo. Qhov no ua rau muaj ntau lub teeb raug absorbed tom qab mus txog qhov chaw reflection, uas tsis tuaj yeem cuam tshuam rau lub teeb emitting nto raws li qhov xav tau, ua rau lub teeb qis qis qis tom qab ntim khoom kawg.

4. Kev xaiv thiab txheej txheej ntawm fluorescent hmoov
Rau lub zog dawb LED, kev txhim kho luminous efficiency kuj muaj feem xyuam rau kev xaiv cov hmoov fluorescent thiab cov txheej txheem kho. Txhawm rau txhim kho kev ua haujlwm ntawm fluorescent hmoov excitation ntawm xiav chips, xaiv cov hmoov fluorescent yuav tsum tsim nyog, nrog rau kev ua kom lub cev muaj zog, qhov loj me, excitation efficiency, thiab lwm yam. Thib ob, txheej txheej ntawm cov hmoov fluorescent yuav tsum tsis sib xws, nyiam dua nrog cov tuab tuab ntawm cov nplaum nplaum ntawm txhua lub teeb-emitting nto ntawm cov nti, kom tsis txhob muaj qhov sib npaug uas yuav ua rau lub teeb hauv zos tsis tuaj yeem tawm, thiab tseem txhim kho cov teeb pom kev zoo. qhov zoo ntawm qhov chaw teeb pom kev zoo.

Txheej txheem cej luam:
Kev tsim hluav taws xob zoo hluav taws xob ua lub luag haujlwm tseem ceeb hauv kev txhim kho luminous efficiency ntawm cov khoom siv hluav taws xob LED, thiab tseem yog qhov yuav tsum tau ua ua ntej kom ntseeg tau cov khoom lag luam lifespan thiab kev ntseeg tau. Lub teeb pom kev zoo tsim channel, nrog rau kev tsom mus rau cov qauv tsim, xaiv cov khoom siv, thiab cov txheej txheem kho cov kab noj hniav, cov nplaum nplaum, thiab lwm yam, tuaj yeem txhim kho lub teeb pom kev zoo ntawm lub zog LEDs. Rau lub hwj chim hom dawb LED, xaiv cov hmoov fluorescent thiab cov txheej txheem tsim kuj tseem ceeb heev rau kev txhim kho qhov chaw loj thiab luminous efficiency.