Spectrally pure far-UVC emission from AlGaN-based LEDs with dielectric band pass filters

dc.contributor.authorGuttmann, Martin
dc.contributor.authorLobo-Ploch, Neysha
dc.contributor.authorGundlach, Heiko
dc.contributor.authorMehnke, Frank
dc.contributor.authorSulmoni, Luca
dc.contributor.authorWernicke, Tim
dc.contributor.authorCho, Hyun Kyong
dc.contributor.authorHilbrich, Katrin
dc.contributor.authorKülberg, Alexander
dc.contributor.authorFriedler, Matthias
dc.contributor.authorFiller, Thomas
dc.contributor.authorKäpplinger, Indira
dc.contributor.authorMitrenga, Dennis
dc.contributor.authorMaier, Christian
dc.contributor.authorBrodersen, Olaf
dc.contributor.authorOrtlepp, Thomas
dc.contributor.authorWoggon, Ulrike
dc.contributor.authorEinfeldt, Sven
dc.contributor.authorKneissl, Michael
dc.date.accessioned2022-03-09T11:59:04Z
dc.date.available2022-03-09T11:59:04Z
dc.date.issued2022-02-18
dc.date.updated2022-02-26T06:49:28Z
dc.description.abstractAlGaN-based far ultraviolet-C (UVC) light emitting diodes (LEDs) with a peak emission wavelength below 240 nm typically show a long-wavelength tail at >240 nm that is detrimental to the use of the devices for skin-friendly antisepsis. We present the development of far-UVC LEDs with reduced long-wavelength emission using a HfO2/SiO2-based distributed Bragg reflector (DBR) filter. When the DBR filter is directly mounted on an LED package, the long-wavelength emission around 250 nm is reduced by two orders of magnitude while the transmitted output power is reduced down to 18%–27% of the initial value for DBR filters with cut-off wavelengths at 237–243 nm. As the transmission through the DBR filter depends strongly on the angle of incidence of the radiation, the transmitted output power of the spectrally pure far-UVC radiation can be doubled when an additional collimating lens is used on top of the LED package before passing through the filter.en
dc.description.sponsorshipBMBF, 03ZZ0146C, Zwanzig20 - Advanced UV for Life - Verbundprojekt: Verhinderung der Infektion mit multiresistenten Erregern über In-vivo-UVC-Bestrahlung, TP3: UVC-LED-Strahler für die In-vivo-Anwendungen
dc.description.sponsorshipBMBF, 03ZZ0146D, Zwanzig20 - Advanced UV for Life - Verbundprojekt: Verhinderung der Infektion mit multiresistenten Erregern über In-vivo-UVC-Bestrahlung, TP4: Herstellung von UV LEDs um 230 nm für die In-vivo-UVC-Bestrahlungen
dc.description.sponsorshipBMBF, 03COV10D, CORONA - CORSA - Verbundvorhaben - Inaktivierung von SARS-CoV-2 durch UVC-Licht und Verträglichkeit für den Menschen; TP4: Epitaxie von 230 nm LEDs für die in vivo UVC-Bestrahlungen
dc.identifier.eissn1361-6463
dc.identifier.issn0022-3727
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/16519
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-15296
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc530 Physikde
dc.subject.otherfar-UVCen
dc.subject.otherLEDen
dc.subject.otherAlGaNen
dc.subject.otherspectral purityen
dc.subject.otherdielectric filteren
dc.subject.otherHfO2/SiO2en
dc.titleSpectrally pure far-UVC emission from AlGaN-based LEDs with dielectric band pass filtersen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber205105en
dcterms.bibliographicCitation.doi10.1088/1361-6463/ac5145en
dcterms.bibliographicCitation.issue20en
dcterms.bibliographicCitation.journaltitleJournal of Physics D: Applied Physicsen
dcterms.bibliographicCitation.originalpublishernameIOPen
dcterms.bibliographicCitation.originalpublisherplaceBristolen
dcterms.bibliographicCitation.volume55en
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Festkörperphysik::FG Experimentelle Nanophysik und Photonikde
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Experimentelle Nanophysik und Photonikde
tub.affiliation.instituteInst. Festkörperphysikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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