Lub Teeb Emitting Diode (LED) yog cov khoom siv hluav taws xob semiconductor uas hloov hluav taws xob ncaj qha mus rau hauv lub teeb los ntawm cov txheej txheem hu ua electroluminescence. Tsis zoo li cov teeb pom kev zoo ib txwm muaj, uas ua rau lub teeb ci los ntawm cua sov filament, LEDs muaj txiaj ntsig zoo, ntev - kav ntev, thiab tawm me ntsis cua sov, ua rau lawv zoo tagnrho rau cov ntawv thov los ntawm cov duab mus rau teeb pom kev zoo.
Ntawm nws cov tub ntxhais, ib qho LED muaj P-N hlws ris tsim los ntawm kev sib txuas P- hom (zoo them, nrog electron "qhov") thiab N- hom (tsis zoo them, nrog cov hluav taws xob ntau dhau) cov khoom siv semiconductor, xws li gallium arsenide (GaAs) rau lub teeb xiav (Galaium) Thaum siv rau pem hauv ntej voltage (feem ntau 1.8–3.3V) yog siv, electrons los ntawm N-sab ntws mus rau P-sab, thaum lub qhov txav oppositely. Ntawm qhov sib txuas, cov hluav taws xob sib txuas nrog lub qhov, tso tawm lub zog hauv daim ntawv ntawm photons- pom lub teeb uas nws cov xim nyob ntawm cov khoom siv lub zog bandgap (xws li, 1.8 eV rau liab, 3.4 eV rau xiav).
Dawb LEDs feem ntau siv xiav LED coated nrog daj phosphor los ua ib qho dav spectrum. LEDs ua haujlwm ntawm qhov tam sim no ncaj qha (DC) thiab yog polarity-sensitive, xav tau kev taw qhia kom zoo kom tsis txhob muaj kev puas tsuaj. Lawv cov kev ua tau zoo tuaj yeem ncav cuag 100-200 lumens ib watt, nrog lub neej ntev txog 50,000 teev, hloov pauv lub zog- teeb pom kev zoo.
