LEDyog lub npe hu ua plaub tiam teeb pom kev zoo los yog lub teeb ntsuab. Nws muaj cov yam ntxwv ntawm kev txuag hluav taws xob, kev tiv thaiv ib puag ncig, kev pab lub neej ntev thiab ntim 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 scene. Raws li kev ua haujlwm sib txawv, nws tuaj yeem muab faib ua tsib pawg: cov ntaub ntawv qhia, teeb liab teeb, tsheb teeb, LCD backlight thiab teeb pom kev zoo.

Cov paLED teebmuaj qhov tsis zoo xws li qhov ci tsis txaus, uas ua rau muaj kev nkag mus tsis txaus. Lub zog LED teeb muaj qhov zoo ntawm qhov ci ci txaus thiab lub neej ua haujlwm ntev, tab sis lub zog LED muaj teeb meem xws li ntim khoom. Ntawm no yog ib qho kev ntsuam xyuas luv luv ntawm cov xwm txheej cuam tshuam rau lub teeb extraction efficiency ntawm lub hwj chim LED ntim.

Ntim yam cuam tshuam rau lub teeb extraction efficiency

1. Thaum tshav kub kub dissipation technology

Rau lub teeb-emitting diode muaj li ntawm PN hlws ris, thaum lub pem hauv ntej tam sim no ntws tawm ntawm lub PN hlws ris, PN hlws ris muaj kub poob. Cov cua sov no tau tawg mus rau hauv cov huab cua los ntawm cov nplaum, cov khoom siv potting, lub dab dej kub, thiab lwm yam hauv cov txheej txheem no, txhua feem ntawm cov khoom muaj thermal impedance los tiv thaiv cov cua sov, uas yog, thermal kuj. Lub thermal tsis kam yog tus nqi ruaj khov txiav txim siab los ntawm qhov loj, qauv thiab cov khoom siv ntawm lub cuab yeej.

Cia lub thermal tsis kam ntawm LED yog rth (℃ / W) thiab lub zog thermal dissipation yog PD (W). Lub sijhawm no, PN kev sib tshuam kub los ntawm thermal poob ntawm tam sim no nce mus rau:

T(℃) = Rth&Tims; PD

PN sib txuas kub:

TJ=TA+Rth&Tims; PD

Qhov twg TA yog qhov kub thiab txias. Qhov kub ntawm qhov sib txuas yuav txo qhov tshwm sim ntawm PN hlws ris lub teeb-emitting recombination, thiab qhov ci ntawm LED yuav txo. Nyob rau tib lub sijhawm, vim qhov nce ntawm qhov kub thiab txias tshwm sim los ntawm kev poob cua sov, qhov ci ntsa iab ntawm LED yuav tsis nce ntxiv rau qhov tam sim no, uas yog, nws qhia tau tias thermal saturation. Tsis tas li ntawd, nrog rau qhov nce ntawm qhov kub thiab txias, lub ncov wavelength ntawm luminescence tseem yuav ya mus rau qhov kev taw qhia yoj ntev, txog 0.2-0.3nm / ℃. Rau cov dawb LED tau los ntawm kev sib tov YAG phosphor coated los ntawm xiav nti, lub drift ntawm xiav wavelength yuav ua rau mismatch nrog lub excitation wavelength ntawm phosphor, thiaj li yuav txo tau lub zuag qhia tag nrho luminous efficiency ntawm dawb LED thiab hloov xim kub ntawm lub teeb dawb.

Rau lub zog LED, kev tsav tsheb tam sim no feem ntau ntau dua li ntau pua Ma, thiab qhov ceev ntawm PN kev sib tshuam tam sim no loj heev, yog li qhov kub ntawm PN kev sib tshuam yog qhov pom tseeb heev. Rau kev ntim khoom thiab daim ntawv thov, yuav ua li cas txo cov thermal tsis kam ntawm cov khoom thiab ua kom cov cua sov tsim los ntawm PN junction dissipate kom sai li sai tau tuaj yeem tsis tsuas yog txhim kho cov saturation tam sim no ntawm cov khoom thiab txhim kho lub luminous efficiency ntawm cov khoom, tab sis kuj txhim kho cov khoom. kev ntseeg siab thiab kev pabcuam lub neej ntawm cov khoom. Txhawm rau txo cov thermal tsis kam ntawm cov khoom, thawj zaug, kev xaiv cov khoom ntim yog qhov tseem ceeb tshwj xeeb, nrog rau cov dab dej kub, cov nplaum, thiab lwm yam thermal kuj ntawm txhua yam khoom yuav tsum tsawg, uas yog, nws yuav tsum muaj thermal conductivity zoo. . Qhov thib ob, cov qauv tsim yuav tsum tsim nyog, cov thermal conductivity ntawm cov ntaub ntawv yuav tsum tsis tu ncua, thiab thermal conductivity ntawm cov ntaub ntawv yuav tsum tau zoo sib txuas, yog li kom tsis txhob kub dissipation bottleneck nyob rau hauv lub tshav kub conduction channel thiab xyuas kom meej lub tshav kub dissipation ntawm lub sab hauv mus rau txheej txheej. Nyob rau tib lub sijhawm, nws yog ib qho tsim nyog los xyuas kom meej tias cov cua sov dissipated nyob rau hauv lub sij hawm raws li lub pre-tsim cua sov dissipation channel.

2. Xaiv cov muab tub lim

Raws li txoj cai refraction, thaum lub teeb yog tshwm sim los ntawm lub teeb ntom nruab nrab mus rau lub teeb sparse nruab nrab, thaum qhov teeb meem lub kaum sab xis mus txog ib qho nqi, uas yog, ntau dua los yog sib npaug rau lub kaum sab xis tseem ceeb, tag nrho emission yuav tshwm sim. Rau GaN xiav nti, qhov 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 refraction, lub kaum sab xis tseem ceeb θ 0 = sin-1 (n2 / n1).

Qhov twg N2 yog sib npaug rau 1, uas yog, lub refractive index ntawm huab cua, thiab N1 yog lub refractive index ntawm Gan, los ntawm uas lub kaum sab xis tseem ceeb yog xam θ 0 yog hais txog 25.8 degrees. Hauv qhov no, tib lub teeb uas tuaj yeem tawm tau yog lub teeb nyob rau hauv lub spatial khoom lub kaum sab xis nrog qhov xwm txheej kaum ≤ 25.8 degrees. Nws tau tshaj tawm tias qhov kev ua haujlwm sab nraud ntawm Gan nti yog li 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. Nws tau tshaj tawm tias qhov kev ua haujlwm sab nraud ntawm Gan nti yog li 30% - 40%. Ib yam li ntawd, lub teeb tawm los ntawm cov nti yuav tsum tau xa mus rau qhov chaw los ntawm cov khoom ntim, thiab cov khoom siv ntawm lub teeb extraction efficiency yuav tsum tau txiav txim siab.

Yog li ntawd, txhawm rau txhim kho lub teeb pom kev zoo ntawm LED cov khoom ntim, tus nqi ntawm N2 yuav tsum tau nce ntxiv, uas yog, qhov ntsuas pom ntawm cov khoom ntim yuav tsum tau nce ntxiv los txhim kho lub kaum ntse ntse ntawm cov khoom, txhawm rau txhim kho cov ntim khoom. luminous efficiency ntawm cov khoom. Nyob rau tib lub sijhawm, lub teeb nqus ntawm cov khoom ntim yuav tsum me me. Txhawm rau txhim kho qhov kev faib ua feem ntawm lub teeb tawm, lub pob zoo dua yog arched lossis hemispherical, yog li thaum lub teeb tawm ntawm cov khoom ntim rau saum huab cua, nws yuav luag perpendicular rau lub interface, yog li tsis muaj tag nrho cov kev xav.

3. Kev xav ua haujlwm

Muaj ob yam tseem ceeb ntawm kev xav txog kev ua haujlwm: ib qho yog qhov kev xav hauv lub nti, thiab lwm qhov yog qhov kev xav ntawm lub teeb los ntawm cov khoom ntim. Los ntawm kev ua haujlwm sab hauv thiab sab nraud, lub teeb flux piv tau tawm ntawm lub nti tuaj yeem txhim kho, kev nqus sab hauv ntawm lub nti tuaj yeem raug txo, thiab cov khoom siv hluav taws xob luminous ntawm lub zog LED tuaj yeem txhim kho. Nyob rau hauv cov nqe lus ntawm ntim, lub hwj chim LED feem ntau sib sau ua ke lub hwj chim nti ntawm cov hlau txhawb los yog substrate nrog reflection kab noj hniav. Kev txhawb nqa hom kev xav txog kab noj hniav feem ntau siv electroplating los txhim kho qhov cuam tshuam, thaum lub hauv paus phaj xav txog kab noj hniav feem ntau siv polishing. Yog tias ua tau, kev kho electroplating yuav tsum tau ua, tab sis ob txoj kev kho saum toj no cuam tshuam los ntawm pwm raug thiab txheej txheem, Cov txheej txheem kev rov ua dua kab noj hniav muaj qee qhov cuam tshuam, tab sis nws tsis yog qhov zoo tagnrho. Tam sim no, vim tsis txaus polishing raug lossis oxidation ntawm cov hlau txheej, qhov cuam tshuam ntawm substrate hom reflection kab noj hniav ua nyob rau hauv Suav teb tsis zoo, uas ua rau ntau lub teeb raug absorbed tom qab tua mus rau hauv lub reflection cheeb tsam thiab tsis muaj peev xwm yuav reflected mus rau lub teeb. Lub teeb emitting nto raws li lub hom phiaj xav tau, uas ua rau lub teeb pom kev tsis zoo tom qab ntim khoom kawg.

4. Phosphor xaiv thiab txheej

Rau lub zog dawb LED, kev txhim kho ntawm luminous efficiency kuj muaj feem xyuam rau kev xaiv phosphor thiab txheej txheem kev kho mob. Txhawm rau txhim kho qhov ua tau zoo ntawm phosphor excitation ntawm xiav nti, ua ntej, kev xaiv phosphor yuav tsum tsim nyog, suav nrog excitation wavelength, particle loj, excitation efficiency, thiab lwm yam, uas yuav tsum tau soj ntsuam tag nrho cov kev ua tau zoo. Qhov thib ob, txheej txheej ntawm phosphor yuav tsum tsis sib xws, zoo dua qhov tuab ntawm cov nplaum txheej ntawm txhua lub teeb-emitting nto ntawm lub teeb-emitting nti yuav tsum tsis sib xws, yog li tsis txhob tiv thaiv lub teeb hauv zos los ntawm kev tawm vim tsis sib xws, tab sis kuj txhim kho 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 lub teeb pom kev zoo ntawm cov khoom siv hluav taws xob LED, thiab nws tseem yog qhov tsim nyog los xyuas kom meej lub neej kev pab cuam thiab kev ntseeg siab ntawm cov khoom. Lub teeb pom kev zoo tsim channel ntawm no tsom mus rau cov qauv tsim, xaiv cov khoom siv thiab cov txheej txheem kev kho mob ntawm cov kab noj hniav thiab cov kua nplaum, uas tuaj yeem txhim kho lub teeb pom kev zoo ntawm lub zog LED. Rau lub zogdawb LED, kev xaiv phosphor thiab txheej txheem tsim kuj tseem ceeb heev los txhim kho qhov chaw thiab luminous efficiency.