Paub txog tus killer ntawm UV ultraviolet lub teeb, lub wavelength ntawm tsuas yog 200 mus rau 280 nm, siab zog, muaj peev xwm nkag mus rau tus kab mob, kab mob, fungi thiab hmoov mula zaj duab xis, tua cov DNA thiab rhuav tshem cov kab tsim kev puas tsuaj.
Vim tias Danish xibfwb Niels Finsen pom tias ultraviolet radiation tuaj yeem siv tau los kho TB, tib neeg siv ultraviolet radiation tau ntau tshaj li ib xyoo dhau los ntawm keeb kwm. Txawm li cas los, tam sim no siv tob tob ultraviolet lub teeb tsis yog loj heev, inefficient, tab sis kuj muaj mercury, teeb meem rau ib puag ncig.
Cov kws tshawb fawb ntawm Cornell University tau nyuam qhuav tsim ib lub me me, ntau qhov chaw zoo nkauj, tsaus ntuj-ultraviolet teeb ci qhov muag thiab cov ntaub ntawv ntawm qhov kev lag luam qis tshaj DEEP-UV LEDs.
Cov neeg tshawb xyuas siv lub atomic-level tswj interface ntawm gallium nitride (Gan) thiab AlN (AlN) monolayer raws li thaj tsam cov tshuaj tiv thaiv, ntse emitting lub wavelength ntawm 232 mus rau 270 nm ntawm nqus ultraviolet. Qhov no 232 nm ntawm sib sib zog nqus ultraviolet hluav taws xob, siv cov roj nitrate ua cov khoom luminescent, tawm los ntawm lub sij hawm luv tshaj ntawm cov ntaub ntawv teeb. Cov ntaub ntawv dhau los yog 239 nm los ntawm cov neeg Nyij Pooj.
Daim ntawv tshawb fawb "Mbe-zus 232-270 nm sib sib zog nqus uv siv nrog monolayer nyias binary kan / aln Quantum heterostructures" tau luam tawm rau Lub Ib Hlis 27 hauv phau ntawv Journal of Physics Applied Physics (smartfactory ™ Physics Letters).
Txhim kho UV LED efficiency
Tam sim no, qhov loj tshaj plaws bottleneck ntawm ultraviolet LED yog luminous efficiency, yuav ntsuas los ntawm peb yam:
1. Kev txhaj tshuaj tiv thaiv: Qhov feem ntawm cov electron uas kis los ntawm lub cuab yeej hauv cheeb tsam tshuaj tiv thaiv.
2. Sab Hauv Kev Txawj Ntse (IQE): qhov sib piv ntawm photons los yog ultraviolet rays ua los ntawm tag nrho electrons hauv cheeb tsam cov tshuaj tiv thaiv.
3. Lub teeb ci: Qhov kev faib ua feem ntawm photons uas ua rau thaj tsam ntawm cov tshuaj tiv thaiv, uas raug coj tawm ntawm lub cuab yeej thiab siv tau.
"Yog hais tias qhov saum toj no peb thaj chaw muaj peev xwm ua kom tau 50%, ua kom muaj kev sib txig sib luag li 12%," said Dr. Moudud Islam, tus sau phau ntawv. 」
Nyob rau hauv tob ultraviolet wavelengths, peb cov kev ua tau zoo tsawg tsawg, tab sis pawg neeg tau pom tias siv cov roj nitrite es tsis txhob siv cov roj ntsha roj tuaj yeem ua kom zoo dua thiab muaj txiaj ntsig zoo.
Txhawm rau txhim kho txoj kev txhaj tshuaj, pawg neeg tshawb fawb tau siv technology ua ntej, hauv qhov zoo (electron) thiab tsis zoo (hluavtaws) qhov chaw siv, siv txoj kev siv polarization vim doping.
Tshawb nrhiav thiab kev loj hlob
Tom qab kev txhim kho cov luminous efficiency ntawm kev sib sib zog nqus ultraviolet coj, cov kauj ruam tom ntej ntawm pawg neeg tshawb fawb yog los muab cov teeb pom kev nkag mus rau hauv lub cuab yeej thiab tawm mus rau lub hom phiaj ntawm cov npe. Daim ntawv sau npe ntawm cov sib sib zog nqus ultraviolet teeb muaj xws li cov zaub mov kev noj qab haus huv, cov ntawv qhia nyiaj tsis ncaj, photocatalyst, dej purification thiab sterilization, thiab lwm yam.
