Lub zog theem ntawm cov ntshiab semiconductor ntawm LED zaub screen, thaum qhov kub thiab txias yog xoom, cov electrons nyob rau hauv tag nrho cov band tsis muaj zog txaus los hla cov txwv band thiab nkag mus rau hauv conduction band, yog li nws yog nyob rau hauv ib tug insulating lub xeev. Raws li qhov kub thiab txias, feem ntau nyob rau hauv chav tsev kub, qee cov electrons muaj lub zog los hla qhov txwv tsis pub thiab ncav cuag qhov kev sib txuas, thaum tawm hauv qhov chaw seem los ua qhov, yog li qhia tsis muaj zog conductivity, uas yog, intrinsic conductivity.
Tom qab impurities tau doped rau hauv cov khoom siv semiconductor ntawm LED zaub screen, lub zog theem ntawm tus neeg pub dawb impurity yog nyob ze rau lub conduction band, thiab lub zog theem ntawm kev txais impurity yog ze rau tag nrho cov qhab. Cov electrons nyob rau hauv pub impurities tau yooj yim nkag mus rau hauv lub conduction band, thiab tus txais impurities tau yooj yim tau electrons los ntawm tag nrho cov band kom tau electrons los ntawm tag nrho cov band los tsim lub qhov. Thaum ib qho hluav taws xob rau pem hauv ntej siv rau PN kev sib tshuam, vim qhov txo qis ntawm kev sib tshuam, cov hluav taws xob nkag mus rau P-hom semiconductor los ntawm N-hom semiconductor, thiab qhov nkag mus rau N-hom semiconductor los ntawm P-hom semiconductor, yog li. tsim kev txhaj tshuaj ntawm cov neeg nqa khoom tsawg. .
Nrog rau kev sib koom ua ke ntawm cov neeg nqa khoom tsawg tau txhaj rau hauv LED, nws lub zog kuj rov qab los ntawm qib siab zog mus rau qib qis zog, thiab lub zog tso tawm tuaj yeem hloov mus rau ntau hom, feem ntau raug tso tawm hauv cov thermal zog. Los ntawm qhov kev pom ntawm lub voj voog, lub zog tso tawm yog sib npaug rau cov khoom ntawm lub zog tam sim no thiab rau pem hauv ntej ntawm PN junction multiplied los ntawm lub sijhawm. Qee cov khoom siv semiconductor tso tawm lub zog nyob rau hauv daim ntawv ntawm lub teeb thaum cov neeg nqa khoom tsawg tau txhaj tshuaj kom rov ua dua, ua rau cov khoom siv hluav taws xob semiconductor luminescence.
LED zaub semiconductor luminescence tuaj yeem muab faib ua ob hom, ib qho yog tias cov hluav taws xob hloov pauv ncaj qha los ntawm cov kab hluav taws xob mus rau tag nrho cov qhab thiab rov ua dua nrog lub qhov kom tawm lub teeb, thiab lwm qhov yog recombination ntawm impurity theem, thiab cov electrons nyob rau hauv conduction. band hloov ua ntej. Txog rau qib pub dawb impurity, nws yog hu ua indirect emission. LED zaub cov khoom siv feem ntau yog ua los ntawm cov khoom siv hluav taws xob tsis ncaj-emitting conductor.
