Xim wavelength thiab daim ntawv thov kev taw qhia ntawm ntau LED chips
1. Xiav LED
Hais txog lub teeb xiav -emitting diode. Gallium nitride (GaN)-raws li semiconductors feem ntau yog siv los ua cov khoom siv rau xiav LEDs. Txoj kev loj hlob ntawm xiav LEDs siv zinc selenide (ZnSe)-raws li semiconductors yav dhau los tau nrov, tab sis txij li thaum muaj kev loj hlob ntawm siab -brightness xiav LEDs siv gallium nitride-raws li semiconductors nyob rau lub Kaum Ob Hlis 1993 , lub ntsiab ntawm xiav LEDs tau dhau los ua GaN-raws li cov khoom lag luam semiconductor.
Qhov nruab nrab ntawm lub emission wavelength ntawm ib gallium nitride (GaN) -raws li lub teeb xiav- emitting diode yog nyob ib ncig ntawm 470 nm. Nws yog siv rau lub teeb ci ntawm xiav qhov chaw xws li teeb pom kev zoo thiab cov cim qhia, lub teeb xiav qhov chaw ntawm LED zaub screen, thiab lub teeb ci backlight ntawm cov kua siv lead ua vaj huam sib luag, thiab lwm yam. Thaum siv ua ke nrog cov ntaub ntawv phosphor, lub teeb dawb tuaj yeem tau txais. Cov LED dawb tam sim no feem ntau siv cov qauv hauv cov xim xiav LED ua ke nrog cov khoom siv fluorescent.
2. Liab LED
red-emitting diode. At present, the commonly used materials for red LEDs are aluminum indium gallium phosphide or aluminum indium gallium phosphide (AlInGaP) compound semiconductors. In the field of LEDs, quaternary materials generally refer to AlInGaP. AlInGaP is called quaternary materials because it uses four elements: aluminum (Al), gallium (Ga), indium (In) and phosphorus (P). AlInGaP doesn't just refer to red, it also covers the wavelength range from red to yellow.
Ua ntej qhov tshwm sim ntawm AlInGaP, GaAs semiconductors yog cov khoom siv tseem ceeb. Cov kua theem epitaxy kev loj hlob technology yog siv. Txij li thaum xyoo 1990s, lub vapor theem epitaxy kev loj hlob tshuab sawv cev los ntawm MOCVD txoj kev tau nce mus, thiab cov khoom siv lead ua tau zoo dua qub vim tias qhov ci ntsa iab ntawm AlInGaP tau nce sai.
Lub nruab nrab wavelength ntawm liab LED teeb emission yog hais txog 620-630 nm. Nws muaj ntau yam kev siv thiab feem ntau yog siv rau lub teeb pom kev ntawm lub teeb liab ntawm lub teeb neon, cov cim qhia, lub teeb lub tsheb thiab cov teeb liab, lub teeb liab ntawm LED cov lus qhia, thiab cov teeb pom kev zoo ntawm cov kua siv lead ua kua.
3. Ntsuab LED
Ib lub diode uas emits ntsuab teeb. Lub gallium nitride (GaN)-raws li cov khoom siv semiconductor tsuas yog siv hauv cov LEDs ntsuab yog siv tsawg dua li cov siv xiav LEDs, thiab lub teeb tso zis hluav taws xob qis dua rau tib lub tswv yim tam sim no. Yog vim li cas rau qhov tsis tshua muaj txiaj ntsig ntawm GaN-raws li semiconductor ntsuab LEDs tam sim no muag feem ntau yog los ntawm piezoelectric teb. Lub piezoelectric teb yog hais txog lub teb hluav taws xob tsim los ntawm piezoelectric polarization tshwm sim los ntawm kev ntxhov siab ntawm cov qauv siv lead ua. Cov tsev kawm qib siab thiab LED nti tuam txhab lag luam hauv Nyij Pooj thiab txawv teb chaws tau pib tshawb fawb txog kev hloov dav hlau loj hlob ntawm GaN crystals kom txhim kho kev ua tau zoo. Yog tias cov dav hlau siv lead ua ntawm GaN-raws li cov khoom siv hluav taws xob hloov pauv, nws muaj peev xwm ua kom muaj txiaj ntsig ntawm cov LEDs ntsuab rau tam sim no 2 zaug ntxiv.
Txhawm rau hloov kho qhov ci ntsa iab thiab sib npaug ntawm cov xim dawb ntawm kev ua lag luam, coj mus rau hauv tus account qhov pom kev rhiab heev ntawm tib neeg lub qhov muag, RGB xim sib xyaw yog feem ntau siv, thiab thaum ua ke nrog liab LED, ntsuab LED thiab xiav LED los tsim backlight qhov chaw ntawm LED zaub lossis LCD vaj huam sib luag, RGB peb siv. Qhov sib piv ntawm cov xim LED lub teeb kom muaj nuj nqis yuav tsum yog li 3: 6: 1 lossis txog 3: 7: 1. Vim tias qhov ci tsis txaus ntawm cov LEDs ntsuab, ntau lub LEDs ntsuab yuav tsum tau siv los ua kom lub zog tso zis ntau ntxiv. Piv nrog LEDs liab thiab xiav, ntsuab LEDs suav hais tias muaj ntau chav rau kev txhim kho.
Ntsuab LED, lub nruab nrab wavelength ntawm lub teeb emission yog hais txog 560nm. Nws yog feem ntau siv los ua lub teeb ci ntawm cov zaub ntsuab ib feem ntawm cov teeb neon thiab cov cim qhia, LED zaub, thiab lwm yam, nrog rau cov teeb pom kev zoo ntawm cov kua siv lead ua kua, thiab lwm yam.
4. Infrared LED
Raws li lub npe qhia, nws hais txog lub diode uas emits infrared teeb. Gallium arsenide (GaAs) cov khoom siv semiconductor xws li aluminium gallium arsenide phosphide (AlGaAsP) feem ntau yog siv. Infrared LED muaj keeb kwm ntev. Xyoo 1962, nws tau tshawb pom tias pn kev sib tshuam ntawm III -V compound semiconductor sawv cev los ntawm gallium arsenide (GaAs) tuaj yeem tawm hluav taws xob nthwv dej sib npaug rau lub teeb infrared.
Infrared LEDs muaj ib tug pem hauv ntej voltage ntawm txog 1.5V, uas yog tsawg piv rau tshaj 2V rau liab LEDs thiab tshaj 3V rau xiav LEDs. Infrared LEDs nrog emission wavelengths tshaj 700nm feem ntau yog siv los ua lub teeb ci rau infrared tej thaj chaw deb tswj kab kev sib txuas lus, xws li sensor teeb qhov chaw, optocoupler lub teeb qhov chaw, thiab lub teeb qhov chaw rau lub taub hau tshuab luam ntawv.
5. Ultraviolet LED
Ib lub diode uas emits UV teeb. Ultraviolet LEDs feem ntau siv gallium nitride (GaN) semiconductors. Feem ntau yog hais txog LEDs nrog emission wavelengths qis dua 400nm, tab sis qee zaum hu ua ze -ultraviolet LEDs thaum lub emission wavelengths ntau dua 380nm, thiab tob -ultraviolet LEDs thaum lub emission wavelengths luv dua 300nm . Lub teeb luv luv - wavelength teeb muaj qhov ua kom tsis muaj menyuam zoo, yog li cov LEDs ultraviolet feem ntau yog siv los ua kom tsis muaj menyuam thiab deodorization ntawm cov tub yees thiab cov khoom siv hauv tsev, nrog rau cov LEDs uas pom lub teeb pom kev ua ke nrog phosphorus. Dawb LEDs kuj tuaj yeem tau txais, piv txwv li los ntawm kev sib txuas liab, ntsuab thiab xiav phosphors nrog UV LEDs.
