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dc.contributor.authorJanjua, Bilal
dc.contributor.authorNg, Tien Khee
dc.contributor.authorZhao, Chao
dc.contributor.authorAnjum, Dalaver H.
dc.contributor.authorPrabaswara, Aditya
dc.contributor.authorConsiglio, Giuseppe Bernardo
dc.contributor.authorShen, Chao
dc.contributor.authorOoi, Boon S.
dc.date.accessioned2017-05-04T06:39:20Z
dc.date.available2017-05-04T06:39:20Z
dc.date.issued2017-02-16
dc.identifier.citationJanjua B, Ng TK, Zhao C, Anjum DH, Prabaswara A, et al. (2017) Health-friendly high-quality white light using violet-green-red laser and InGaN nanowires-based true yellow nanowires light-emitting diodes . Gallium Nitride Materials and Devices XII. Available: http://dx.doi.org/10.1117/12.2250285.
dc.identifier.doi10.1117/12.2250285
dc.identifier.urihttp://hdl.handle.net/10754/623324
dc.description.abstractWhite light based on blue laser - YAG: Ce phosphor has the advantage of implementing solid-state lighting and optical wireless communications combined-functionalities in a single lamp. However, the blue light was found to disrupt melatonin production, and therefore the human circadian rhythm in general; while the yellow phosphor is susceptible to degradation by laser irradiation and also lack tunability in color rendering index (CRI). In this investigation, by using a violet laser, which has 50% less impact on circadian response, as compared to blue light, and an InGaN-quantum-disks nanowires-based light-emitting diode (NWs-LED), we address both issues simultaneously. The white light is therefore generated using violet-green-red lasers, in conjunction with a yellow NWs-LED realized using molecular beam epitaxy technique, on titanium-coated silicon substrates. Unlike the conventional quantum-well-based LED, the NWs-LED showed efficiency-droop free behavior up to 9.8 A/cm with peak output power of 400 μW. A low turn-on voltage of ∼2.1 V was attributed to the formation of conducting titanium nitride layer at NWs nucleation site and improved fabrication process in the presence of relatively uniform height distribution. The 3D quantum confinement and the reduced band bending improve carriers-wavefunctions overlap, resulting in an IQE of ∼39 %. By changing the relative intensities of the individual color components, CRI of >85 was achieved with tunable correlated color temperature (CCT), thus covering the desired room lighting conditions. Our architecture provides important considerations in designing smart solid-state lighting while addressing the harmful effect of blue light.
dc.publisherSPIE
dc.relation.urlhttp://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2605114
dc.rightsCopyright 2017 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
dc.subjectCircadian rhythm
dc.subjectLaser
dc.subjectLight emitting diode
dc.subjectNanowire
dc.subjectSolid-state lighting
dc.subjectViolet
dc.subjectWhite light
dc.subjectYellow
dc.titleHealth-friendly high-quality white light using violet-green-red laser and InGaN nanowires-based true yellow nanowires light-emitting diodes
dc.typeConference Paper
dc.contributor.departmentKing Abdullah Univ. of Science and Technology (Saudi Arabia)
dc.identifier.journalGallium Nitride Materials and Devices XII
dc.conference.date2017-01-30 to 2017-02-02
dc.conference.nameGallium Nitride Materials and Devices XII
dc.conference.locationSan Francisco, CA, USA
dc.eprint.versionPublisher's Version/PDF
kaust.personJanjua, Bilal
kaust.personNg, Tien Khee
kaust.personZhao, Chao
kaust.personAnjum, Dalaver H.
kaust.personPrabaswara, Aditya
kaust.personConsiglio, Giuseppe Bernardo
kaust.personShen, Chao
kaust.personOoi, Boon S.
refterms.dateFOA2018-06-13T16:04:19Z


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