On-chip mercury-free deep-uv light-emitting sources with ultrahigh germicidal efficiency

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buir.contributor.authorSharma, Vijay Kumar
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage2100072-7en_US
dc.citation.issueNumber5en_US
dc.citation.spage2100072-1en_US
dc.citation.volumeNumber9en_US
dc.contributor.authorSharma, Vijay Kumar
dc.contributor.authorTan, S. T.
dc.contributor.authorHaiyang, Z.
dc.contributor.authorShendre, S.
dc.contributor.authorBaum, A.
dc.contributor.authorChalvet, F.
dc.contributor.authorTirén, J.
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2022-01-26T06:57:20Z
dc.date.available2022-01-26T06:57:20Z
dc.date.issued2021-08-04
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractIn the current COVID-19 scenario, there is an urgent need for developing efficient and mercury-free deep-ultraviolet (deep-UV) light sources for disinfection applications. AlGaN-based light-emitting diodes (LEDs) may be considered as an alternative, but due to their inherent low efficiencies in the deep-UV spectral region, significant developments are required to address efficiency issues. Here, a mercury-free chip-size deep-UV light source is shown which is enabled by high-vacuum chip-scale cavity sealing overcoming the limitations of both mercury lamps and deep-UV LEDs. These deep-UV chips are cathodoluminescence based, in which a cavity is created with high vacuum integrity for efficient field-emission. These chips demonstrate optical output power ≥20 mW (efficiency ≈4%) and, owing to the spectral overlap of phosphor cathodoluminescence spectra and germicidal effectiveness curve, resulted in log 6 (99.9999%) germicidal efficiency. Additionally, these chips offer high reliability, “instant” ON/OFF capability, high operational lifetimes, and low-temperature dependence with complete design freedom.en_US
dc.embargo.release2022-08-04
dc.identifier.doi10.1002/adom.202100072en_US
dc.identifier.eissn2195-1071
dc.identifier.urihttp://hdl.handle.net/11693/76783
dc.language.isoEnglishen_US
dc.publisherWiley-VCH Verlag GmbH & Co. KGaAen_US
dc.relation.isversionofhttps://doi.org/10.1002/adom.202100072en_US
dc.source.titleAdvanced Optical Materialsen_US
dc.subjectCathodoluminescenceen_US
dc.subjectDeep-ultraviolet chipsen_US
dc.subjectDisinfection applicationsen_US
dc.subjectUltrahigh germicidal efficiencyen_US
dc.subjectUvc light sourcesen_US
dc.titleOn-chip mercury-free deep-uv light-emitting sources with ultrahigh germicidal efficiencyen_US
dc.typeArticleen_US

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Institute of Materials Science and Nanotechnology (UNAM)
Department of Electrical and Electronics Engineering
Department of Physics