1. Blue LED nti + daj ntsuab phosphor, suav nrog polychrome phosphor derivative

Lub daj ntsuab phosphor txheej absorbs xiav lub teeb ntawm ib coLED chipslos tsim photoluminescence, thiab lub teeb xiav los ntawm LED chips kis tawm ntawm phosphor txheej thiab converges nrog lub teeb daj ntsuab tawm los ntawm phosphor ntawm ntau lub ntsiab lus hauv qhov chaw, thiab lub teeb liab ntsuab xiav yog sib xyaw rau hauv lub teeb dawb;Nyob rau hauv txoj kev no, qhov siab tshaj plaws theoretical tus nqi ntawm photoluminescence conversion efficiency ntawm phosphor, ib qho ntawm sab nraud quantum efficiency, yuav tsis pub tshaj 75%;Qhov siab tshaj plaws rho tawm ntawm lub teeb ntawm lub nti tuaj yeem ncav cuag li 70%.Yog li, txoj kev xav, qhov siab tshaj plaws luminous efficiency ntawm xiav lub teeb dawb LED yuav tsis tshaj 340 Lm / W, thiab CREE yuav ncav cuag 303 Lm / W ob peb xyoos dhau los.Yog tias qhov ntsuas tau raug, nws tsim nyog ua kev zoo siab.

2. Liab ntsuab xiav peb thawj xim ua ke RGB LED hom, suav nrog RGB W LED hom, thiab lwm yam

Pebteeb-emittingdiodes, R-LED (liab) + G-LED (ntsuab) + B-LED (xiav), yog ua ke los tsim lub teeb dawb los ntawm kev sib xyaw xim liab, ntsuab thiab xiav lub teeb tawm hauv qhov chaw.Txhawm rau tsim kom muaj kev ua haujlwm siab luminous dawb lub teeb nyob rau hauv txoj kev no, ua ntej ntawm tag nrho cov, tag nrho cov xim LEDs, tshwj xeeb tshaj yog ntsuab LEDs, yuav tsum tau npaum li cas lub teeb pom kev zoo, uas suav txog li 69% ntawm "sib npaug zog dawb lub teeb".Tam sim no, lub teeb pom kev zoo ntawm xiav LED thiab liab LED tau siab heev, nrog rau kev ua haujlwm sab hauv quantum tshaj 90% thiab 95% feem, tab sis sab hauv quantum efficiency ntawm ntsuab LED yog nyob deb tom qab.Qhov tshwm sim ntawm lub teeb ntsuab qis ntawm GaN raws li LED yog hu ua "green light gap".Qhov laj thawj tseem ceeb yog qhov ntsuab LED tseem tsis tau pom nws tus kheej cov khoom siv epitaxial.Kev ua haujlwm ntawm cov khoom siv phosphorus arsenic nitride uas twb muaj lawm yog tsawg heev hauv cov xim daj ntsuab chromatographic ntau yam.Txawm li cas los xij, lub teeb ntsuab LED yog tsim los ntawm lub teeb liab lossis xiav lub teeb epitaxial cov ntaub ntawv.Nyob rau hauv cov xwm txheej uas tsis tshua muaj tam sim no, vim tias tsis muaj phosphor hloov dua siab tshiab, lub teeb ntsuab LED muaj ntau dua luminous efficiency tshaj lub teeb xiav + phosphor ntsuab teeb.Nws tau tshaj tawm tias nws qhov kev ua haujlwm luminous nce mus txog 291Lm / W raws li tam sim no ntawm 1mA.Txawm li cas los xij, nyob rau hauv siab tam sim no, lub luminous efficiency ntawm lub teeb ntsuab tshwm sim los ntawm Droop nyhuv txo qis.Thaum qhov ceev tam sim no nce, lub luminous efficiency txo sai heev.Nyob rau hauv 350mA tam sim no, lub luminous efficiency yog 108Lm / W, thiab nyob rau hauv 1A mob, lub luminous efficiency txo mus rau 66Lm / W.

Rau pab pawg III phosphides, emitting lub teeb rau ntsuab band tau dhau los ua qhov teeb meem ntawm cov khoom siv.Hloov cov muaj pes tsawg leeg ntawm AlInGaP kom nws tawm lub teeb ntsuab es tsis txhob liab, txiv kab ntxwv los yog daj - ua rau cov cab kuj tsis txaus yog vim qhov tsis tshua muaj zog ntawm cov khoom siv, uas txwv tsis pub muaj hluav taws xob zoo.

Hauv qhov sib piv, nws yog qhov nyuaj dua rau Pab Pawg III nitrides kom ua tiav kev ua haujlwm siab, tab sis qhov nyuaj tsis tuaj yeem cuam tshuam.Thaum lub teeb txuas ntxiv mus rau lub teeb ntsuab band nrog cov kab ke no, ob yam uas yuav txo tau qhov kev ua tau zoo yog cov quantum efficiency sab nraud thiab hluav taws xob efficiency.Qhov txo qis ntawm cov khoom siv hluav taws xob sab nraud los ntawm qhov tseeb tias txawm hais tias qhov sib txawv ntsuab ntawm qhov sib txawv yog qis dua, lub teeb ntsuab LED siv lub siab rau pem hauv ntej ntawm GaN, uas txo qhov kev hloov hluav taws xob.Qhov thib ob qhov tsis zoo yog qhov ntsuabLED txonrog rau qhov nce ntawm kev txhaj tshuaj tam sim no ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom.Cov nyhuv Droop kuj tshwm nyob rau hauv xiav LED, tab sis nws yog qhov hnyav dua nyob rau hauv ntsuab LED, uas ua rau txo qis ntawm cov pa ua haujlwm tam sim no.Txawm li cas los xij, muaj ntau yam laj thawj rau cov nyhuv droop, tsis tsuas yog Auger recombination, tab sis kuj dislocation, carrier overflow los yog hluav taws xob to.Cov tom kawg yog txhim kho los ntawm high voltage internal electric teb.

Yog li ntawd, txoj hauv kev los txhim kho lub luminous efficiency ntawm ntsuab LED: ntawm ib sab, kawm yuav ua li cas txo cov nyhuv Droop los txhim kho lub luminous efficiency nyob rau hauv cov xwm txheej ntawm cov ntaub ntawv epitaxial uas twb muaj lawm;Ntawm qhov tod tes, lub xiav LED ntxiv rau ntsuab phosphor yog siv rau photoluminescence hloov dua siab tshiab rau emit ntsuab teeb.Txoj kev no tuaj yeem tau txais lub teeb ntsuab nrog kev ua haujlwm siab luminous, uas theoretically tuaj yeem ua tiav cov luminous efficiency ntau dua li lub teeb dawb tam sim no.Nws belongs rau lub teeb ntsuab tsis tshwm sim.Cov xim purity poob los ntawm nws cov spectral broadening tsis zoo rau cov zaub, tab sis nws tsis muaj teeb meem rau cov teeb pom kev zoo tib yam.Nws muaj peev xwm kom tau txais ntsuab luminous efficiency ntau dua 340 Lm / W, Txawm li cas los xij, lub teeb dawb ua ke yuav tsis tshaj 340 Lm / W;Thib peb, txuas ntxiv tshawb fawb thiab nrhiav koj tus kheej cov ntaub ntawv epitaxial.Tsuas yog nyob rau hauv txoj kev no tuaj yeem muaj kev cia siab tias tom qab tau txais lub teeb ntsuab ntau dua 340 Lm / w, lub teeb dawb ua ke los ntawm cov xim liab, ntsuab thiab xiav peb lub ntsiab xim LEDs yuav siab dua qhov kev siv lub teeb ci ntawm xiav nti. Dawb LED ntawm 340 Lm / W.

3. Ultraviolet LED nti + tri xim phosphor

Lub ntsiab tsis xws luag ntawm cov saum toj no ob hom ntawm dawb LED yog hais tias lub spatial faib ntawm luminosity thiab chroma yog tsis sib xws.Lub teeb UV tsis pom ntawm tib neeg lub qhov muag.Yog li ntawd, UV lub teeb tawm ntawm lub nti yog absorbed los ntawm tri xim phosphor ntawm lub ntim txheej, thiab tom qab ntawd hloov los ntawm photoluminescence ntawm phosphor mus rau lub teeb dawb thiab tawm mus rau qhov chaw.Qhov no yog nws qhov txiaj ntsig loj tshaj plaws, ib yam li lub teeb fluorescent tsoos, nws tsis muaj xim tsis sib xws.Txawm li cas los xij, qhov theoretical luminous efficiency ntawm ultraviolet nti hom dawb LED tsis tuaj yeem siab tshaj qhov theoretical tus nqi ntawm xiav nti hom dawb lub teeb, cia nyob ib leeg tus nqi theoretical ntawm RGB hom dawb lub teeb.Txawm li cas los xij, tsuas yog los ntawm kev txhim kho tricolor phosphors zoo haum rau UV lub teeb excitation nws tuaj yeem ua tau kom tau txais ultraviolet dawb LED nrog zoo sib xws lossis txawm tias lub teeb pom kev zoo dua li ob lub LED dawb hais saum toj no.Qhov ze dua ntawm ultraviolet LED yog rau lub teeb xiav, qhov ntau dua yuav ua tau, thiab cov LED dawb nrog nruab nrab yoj thiab luv yoj ultraviolet kab yuav ua tsis tau.