Lub teeb-emitting diode yog tshwj xeeb diode. Zoo li cov diodes zoo tib yam, lub teeb-emitting diodes yog tsim los ntawm semiconductor chips. Cov khoom siv semiconductor no yog pre-implanted los yog doped los tsim p thiab n cov qauv.
Zoo li lwm yam diodes, tam sim no nyob rau hauv lub teeb-emitting diode tuaj yeem yooj yim ntws los ntawm p ncej (anode) mus rau n ncej (cathode), tab sis tsis nyob rau hauv qhov kev taw qhia. Ob lub tshuab nqa sib txawv: qhov thiab cov hluav taws xob ntws los ntawm cov electrodes mus rau p thiab n cov qauv nyob rau hauv qhov sib txawv electrode voltages. Thaum lub qhov thiab cov hluav taws xob sib ntsib thiab sib sau ua ke, cov hluav taws xob poob mus rau theem qis zog thiab tso tawm lub zog hauv daim ntawv ntawm photons (photons yog qhov peb feem ntau hu ua lub teeb).
Lub wavelength (xim) ntawm lub teeb nws emits yog txiav txim los ntawm lub bandgap zog ntawm cov semiconductor cov ntaub ntawv uas ua rau p thiab n cov qauv.
Txij li thaum silicon thiab germanium yog cov ntaub ntawv tsis ncaj qha bandgap, nyob rau hauv chav tsev kub, kev sib txuas ntawm cov hluav taws xob thiab qhov hauv cov ntaub ntawv no yog qhov tsis muaj hluav taws xob hloov pauv. Xws li kev hloov pauv tsis tso tawm photons, tab sis hloov lub zog rau hauv lub zog cua sov. Yog li ntawd, silicon thiab germanium diodes tsis tuaj yeem tawm lub teeb (lawv yuav tawm lub teeb ntawm qhov kub tshwj xeeb, uas yuav tsum tau kuaj pom ntawm lub kaum ntse ntse tshwj xeeb, thiab qhov ci ntawm lub teeb tsis pom tseeb).
Cov ntaub ntawv siv nyob rau hauv lub teeb-emitting diodes yog tag nrho cov ntaub ntawv ncaj qha bandgap, yog li lub zog tso tawm nyob rau hauv daim ntawv ntawm photons. Cov kev txwv tsis pub siv hluav taws xob no sib haum rau lub teeb lub zog hauv qhov ze-infrared, pom, lossis ze-ultraviolet bands.
Cov qauv no simulates lub LED uas emits lub teeb nyob rau hauv infrared ib feem ntawm lub electromagnetic spectrum.
Nyob rau theem pib ntawm txoj kev loj hlob, lub teeb-emitting diodes siv gallium arsenide (GaAs) tsuas yog emit infrared lossis teeb liab. Nrog rau kev nce qib ntawm cov ntaub ntawv tshawb fawb, tshiab tsim lub teeb-emitting diodes tuaj yeem tawm lub teeb nthwv dej nrog ntau dua thiab ntau dua. Niaj hnub no, lub teeb-emitting diodes ntawm ntau yam xim tuaj yeem ua tau.
Diodes feem ntau yog tsim los ntawm N-hom substrate, nrog ib txheej ntawm P-hom semiconductor tso rau ntawm nws qhov chaw thiab txuas nrog electrodes. P-hom substrates tsis tshua muaj, tab sis kuj siv. Ntau lub teeb-emitting diodes, tshwj xeeb tshaj yog GaN / InGaN, kuj siv sapphire substrates.
Feem ntau cov ntaub ntawv siv los ua LEDs muaj qhov ntsuas siab siab heev. Qhov no txhais tau hais tias feem ntau ntawm lub teeb nthwv dej tau rov qab los rau hauv cov khoom ntawm qhov sib cuam tshuam nrog huab cua. Yog li ntawd, lub teeb yoj rho tawm yog lub ntsiab lus tseem ceeb rau LEDs, thiab ntau txoj kev tshawb fawb thiab kev loj hlob yog tsom rau lub ntsiab lus no.
Qhov sib txawv tseem ceeb ntawm LEDs (lub teeb emitting diodes) thiab cov diodes zoo tib yam yog lawv cov ntaub ntawv thiab cov qauv, uas ua rau muaj qhov sib txawv loj hauv lawv cov kev ua tau zoo hauv kev hloov hluav taws xob rau hauv lub teeb lub zog. Nov yog qee cov ntsiab lus tseem ceeb los piav qhia vim li cas LEDs tuaj yeem tawm lub teeb thiab cov diodes zoo tib yam tsis tuaj yeem:
Cov khoom sib txawv:LEDs siv III-V semiconductor cov ntaub ntawv xws li gallium arsenide (GaAs), gallium phosphide (GaP), gallium nitride (GaN), thiab lwm yam. Cov ntaub ntawv no muaj ib lub bandgap ncaj qha, tso cai rau cov electrons ncaj qha dhia thiab tso tawm photons (lub teeb). Ordinary diodes feem ntau yog siv silicon los yog germanium, uas muaj ib tug indirect bandgap, thiab lub electron dhia feem ntau tshwm sim nyob rau hauv daim ntawv ntawm tshav kub lub zog tso tawm, es tsis yog lub teeb.
Txawv qauv:Cov qauv ntawm LEDs yog tsim los txhim kho lub teeb tsim thiab emission. LEDs feem ntau ntxiv cov dopants tshwj xeeb thiab txheej txheej txheej ntawm pn kev sib tshuam los txhawb kev tsim thiab tso tawm ntawm photons. Ordinary diodes yog tsim los optimize lub rectification muaj nuj nqi ntawm tam sim no thiab tsis tsom rau tiam ntawm lub teeb.
Energy bandgap:Cov khoom siv ntawm LED muaj lub zog loj bandgap, uas txhais tau hais tias lub zog tso tawm los ntawm cov hluav taws xob thaum lub sij hawm hloov pauv yog siab txaus los tshwm nyob rau hauv daim ntawv ntawm lub teeb. Cov khoom siv bandgap lub zog ntawm cov diodes zoo tib yam yog me me, thiab cov hluav taws xob feem ntau yog tso rau hauv daim ntawv ntawm tshav kub thaum lawv hloov.
Luminescence mechanism:Thaum lub pn hlws ris ntawm LED yog nyob rau hauv pem hauv ntej bias, electrons txav los ntawm lub n cheeb tsam mus rau lub p cheeb tsam, recombine nrog lub qhov, thiab tso tawm lub zog nyob rau hauv daim ntawv ntawm photons los tsim lub teeb. Nyob rau hauv zoo tib yam diodes, recombination ntawm electrons thiab qhov yog tsuas yog nyob rau hauv daim ntawv ntawm tsis-radiative recombination, uas yog, lub zog yog tso tawm nyob rau hauv daim ntawv ntawm tshav kub.
Cov kev sib txawv no tso cai rau LEDs tawm lub teeb thaum ua haujlwm, thaum cov diodes zoo tib yam tsis tuaj yeem.
Kab lus no yog los ntawm Is Taws Nem thiab cov ntawv pov thawj yog los ntawm tus sau thawj
Post lub sij hawm: Aug-01-2024