LED (Illumination emitation emitting diod) yog lo lus rau cov teeb pom kev ua los ntawm semiconductors hu ua lub teeb pom kev zoo. Liab, daj, xiav, thiab lub teeb ntsuab yog kev tsim tawm ncaj qha los ntawm cov cab kuj muaj zog tshaj plaws hauv cov khoom soob hoom qav taub hau. Los ntawm kev siv cov hau kev no, koj tuaj yeem ntxuav koj LCD Soj ntsuam lub vijtsam tsis muaj kev pheej hmoo ntawm kev mob. Ua raws li cov chaw tsim khoom cov lus qhia yog tias koj tus soj ntsuam muaj ib txheej tshwj xeeb lossis txheej txheem tiv thaiv, lossis yog tias koj tsis huv yuav ua li cas kom huv. Nws tuaj yeem yog li emit teeb ntawm ib qho xim los ntawm kev thov peb lub npe xim lossis phosphors. Lub teeb pom kev zoo ua tau siv coj ua raws li lub teeb ci teeb yog lub teeb LED. Ntawm ntawm teeb pom kev zoo conixtures, reflective LED teeb pom kev zoo tuaj yeem yog qhov muaj peev xwm rau qee lub sijhawm, thiab thaj chaw loj nyob sab hauv tsev tsis tau paub tab.
Teeb lub ntsiab cai
LED lub teeb ci yog ib qho kev sib tshuam PN, thiab nws cov semiconduction suav nrog cov pa roj av), sib pauv ntawm gallium), thiab GALLIAST arsenide phosphide). Raws li qhov tshwm sim, nws muaj cov kev kho kom zoo, thim rov qab txiav, thiab cov yam ntxwv tawg ntawm ib qho kev sib tshuam pn. Tsis tas li ntawd, nws ua rau cov khoom siv luminis force nyob rau qee kis xwm txheej. Lub cheeb tsam hauv cheeb tsam Electron rau hauv P cheeb tsam P cheeb tsam thiab P cheeb tsam txhaj qhov rau hauv N thaj tsam thaum cov voltage rau pem hauv ntej yog thov. Ib feem ntawm cov muaj haiv neeg tsawg (cov khoom siv tsawg) uas nkag mus rau lwm cov cheeb tsam ua haujlwm raws li cov tsiaj ntawv tseem ceeb (cov khoom lag luam loj) los tawm teeb.
Piv txwv tias lub teeb pom kev tshwm sim hauv POS cheeb tsam, cov qhab nia txhaj nrog lub teeb pom kev zoo ncaj qha los ntawm lub teeb pom kev zoo los ntawm lub teeb emission Ntxiv rau cov teeb pom kev no, qee cov tshuab hluav taws xob tau ntes los ntawm cov chaw uas tsis yog luminescent (lub chaw no yog band) thiab tom qab ntawd recombine nrog qhov. Lub zog tso tawm txhua zaus tsis loj thiab tsis tuaj yeem tsim lub teeb pom. Qhov ntau dua qhov sib piv ntawm lub teeb emission ntawm lub teeb emission recicomination rau tus nqi ntawm cov nyiaj tsis muaj luminescent, ntau dua lub teeb qigniciency. Txij li thaum lub recombination yog emitted hauv cov chaw me muaj kab mob diffusion diffusion, lub teeb tsuas yog tsim nyob rau hauv ob peb μm nyob ze ntawm PN sib tshuam saum npoo.
Theoretical thiab cov tswv yim pov thawj hais tias lub peak wavelong eg ntawm lub teeb pom kev nyob rau hauv lub teeb cov khoom nyob rau hauv lub teeb cov khoom nyob rau hauv lub teeb cov khoom nyob rau hauv lub teeb cov khoom nyob rau hauv lub teeb cov khoom hauv thaj chaw emissonductor cheeb tsam, uas yog, ≈1240 \/ piv txwv li (hli)
Chav ntawm piv txwv yog hluav taws xob volt (EV). Cov khoom siv semiconductor piv txwv li ntawm 3.26 thiab 1.63 efl yog pom lub teeb-uas muaj lub teeb liab-uas muaj lub teeb liab thiab 780 nm xim liab-tuaj yeem tsim tawm. Infrared lub teeb muaj lub siab loj dua liab dua lub teeb liab. Txawm hais tias muaj diodes uas emit infrared, liab, ntsuab, thiab xiav lub teeb, xiav lub teeb oves yog siv tau vim lawv tus nqi kim.