Q1: Dab tsi yog qhov txawv ntawm lumen efficiency ntawm ib leeg LED thiab lub teeb ua los ntawm LED teeb?
A: Rau ib qho LED tshwj xeeb, muaj ib qho kev taw qhia rau pem hauv ntej, xws li IF=20mA rau pem hauv ntej tam sim no (suav VF ≈ 3.4V), thiab ntsuas hluav taws xob flux φ=1.2lm, tom qab ntawd lub lumen effect of LED yog η=1.2LM × 1000/3.4V × 20mA=1200/68≈17.6LM/W. Pom tseeb, rau ib qho LED, piv txwv li, lub zog siv hluav taws xob Pe=VF × IF, tom qab ntawd qhov ntsuas hluav taws xob hluav taws xob ntawm lub zog no yuav raug hloov mus rau hauv lumens ib watt, uas yog cov nyhuv lumen ntawm ib qho LED.
Txawm li cas los xij, raws li lub teeb, tsis hais lub hwj chim VF ntawm LEDPN kev sib tshuam hauv kev muaj tiag × IF yog dab tsi? Lub zog hluav taws xob ntawm lub teeb yog ib txwm yog qhov chaw nres nkoj ntawm lub teeb. Nws suav nrog kev siv hluav taws xob ntawm lub tuam tsev fais fab (xws li hluav taws xob tswj hluav taws xob, hluav taws xob stabilizer, AC rectifier rau DC fais fab mov department, thiab lwm yam). Lub xub ntiag ntawm lub voj voog tsav hauv lub teeb yuav ua rau nws cov lumen efficiency qis dua li ntawm ib qho kev sim LED. Qhov ntau dua qhov kev siv hluav taws xob, qhov cuam tshuam lumen qis dua, yog li nws yog qhov tseem ceeb heev kom nrhiav tau tus tsav tsheb zoo LED.
Q2: Dab tsi yog LED hlws ris kub? Dab tsi cuam tshuam qhov kub ntawm qhov sib txuas ntawm LED?
A: Lub hauv paus qauv LED yog semiconductor PN hlws ris. Thaum cov tam sim no ntws los ntawm LED ntaus ntawv, PN hlws ris kub yuav nce. Hais lus nruj me ntsis, qhov kub ntawm PN hlws ris cheeb tsam yog txhais raws li qhov sib txuas kub ntawm LED. Feem ntau, vim hais tias cov cuab yeej nti me me, peb kuj tuaj yeem siv qhov kub ntawm LED nti raws li qhov kub thiab txias.LED phab ntsa ntxhua khaub ncawsnqe
Thaum lub PN hlws ris kub (xws li lub plhaub kub) nce, lub ionization ntawm impurities nyob rau hauv lub PN hlws ris accelerates, thiab intrinsic excitation accelerates. Thaum cov concentration ntawm cov cab kuj tsim los ntawm intrinsic excitation yog ntau dua li cov concentration ntawm impurities, nrog rau qhov txo ntawm kev tsiv teb tsaws tus nqi, qhov cuam tshuam ntawm qhov nce ntawm tus naj npawb ntawm intrinsic carriers yog hnyav dua li ntawm semiconductor resistivity hloov, ua rau. Internal quantum nyhuv. Qhov nce ntawm qhov kub thiab txias ua rau txo qis ntawm kev tiv thaiv, ua rau txo qis ntawm VF nyob rau hauv tib lub sijhawm nruab nrab zaus. LED tsav los ntawm IF qhov chaw tam sim no tsis raug tshem tawm. Qhov txo qis ntawm VF yuav nce IF index. Cov txheej txheem no yuav muab ob npaug rau LEDPN kev sib tshuam kub, thiab thaum kawg qhov kub nce siab yuav ncua qhov kub sib tshuam loj, ua rau LEDPN tawm nyhuv. Qhov no yog ib tug zoo tswv yim malignant txheej txheem. Nqe ntawmsab nraum zoov phab ntsa ntxhua khaub ncaws
Qhov nce ntawm qhov kub thiab txias ntawm PN kev sib tshuam ua rau cov txheej txheem photon emission ntawm qhov zoo siab electron / qhov recombination cov tshuaj tiv thaiv hauv semiconductor PN junction degenerate los ntawm qib siab zog mus rau qib qis zog. Qhov no yog vim hais tias thaum kub ntawm PN hlws ris nce, lub amplitude ntawm lub semiconductor lattice nce, yog li ua rau lub zog vibration. Thaum tus nqi tsim nyog dhau lawm, lub tshuab hluav taws xob / qhov yuav pauv lub zog nrog lub lattice atom (los yog ion), thiab kev hloov pauv ntawm lub xeev zoo siab mus rau hauv av, yog li dhau los ua kev hloov pauv tsis muaj photon hluav taws xob, thiab kev ua haujlwm kho qhov muag ntawm LED yuav poob.
Tsis tas li ntawd, PN hlws ris kub kuj tuaj yeem ua rau ionization ntawm impurities nyob rau hauv semiconductor impurity ions ntawm lub lattice teb, ua rau cov kab rov tav fission ntawm ions, uas zoo li yuav ruaj khov nyob rau hauv lub zog ntawm PN hlws ris kub, uas txhais tau hais tias lub lattice. Kev co hloov nws cov lattice symmetry, ua rau lub zog theem, thiab hluav taws xob hloov spectrum vim qhov kub ntawm qhov kub, uas yog vim li cas lub wavelength ntawm LED teeb hloov nrog qhov nce ntawm PN hlws ris kub.
Hauv kev xaus, qhov kub nce ntawm LEN PN kev sib tshuam yuav ua rau kev hloov pauv ntawm nws cov hluav taws xob, kho qhov muag thiab thermal ua haujlwm. Kev kub siab ntau dhau kuj tseem yuav hloov lub cev lub zog ntawm cov khoom ntim LED (xws li epoxy resin, phosphor, thiab lwm yam), ua rau LED tsis ua haujlwm. Yog li ntawd, txo qhov kub nce ntawm PN kev sib tshuam yog lub ntsiab lus tseem ceeb siv LED.
Q3: Dab tsi yog electrostatic comminution? Hom LED twg yog qhov yooj yim rau kev puas tsuaj los ntawm hluav taws xob zoo li qub thiab ua rau tsis ua haujlwm?
A: Electrostatic hluav taws xob tiag tiag yog tsim los ntawm cov nqi tsub zuj zuj. Hauv lub neej niaj hnub, tshwj xeeb tshaj yog nyob rau hauv huab cua qhuav, tib neeg yuav hnov "hluav taws xob poob siab" thaum kov lub qhov rooj thiab qhov rais, uas yog "tso tawm" ntawm hluav taws xob zoo li qub hauv qhov rooj thiab qhov rais mus rau qee yam. Rau wool fabrics thiab nylon chemical fiber cov khoom, lub zog hluav taws xob zoo li qub tuaj yeem ua rau siab li 10000 volts. Qhov hluav taws xob muaj zog heev, tab sis lub zog hluav taws xob zoo li qub tsis loj, uas yuav tsis hem lub neej, tab sis txawm tias lub neej. Txawm li cas los xij, qee cov khoom siv hluav taws xob yuav ua rau cov khoom siv poob qis.