Health-friendly high-quality white light using violet-green-red laser and InGaN nanowires-based true yellow nanowires light-emitting diodes

Handle URI:
http://hdl.handle.net/10754/623324
Title:
Health-friendly high-quality white light using violet-green-red laser and InGaN nanowires-based true yellow nanowires light-emitting diodes
Authors:
Janjua, Bilal ( 0000-0001-9974-9879 ) ; Ng, Tien Khee ( 0000-0002-1480-6975 ) ; Zhao, Chao ( 0000-0002-9582-1068 ) ; Anjum, Dalaver H.; Prabaswara, Aditya ( 0000-0003-1892-671X ) ; Consiglio, Giuseppe Bernardo; Shen, Chao; Ooi, Boon S. ( 0000-0001-9606-5578 )
Abstract:
White 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.
KAUST Department:
King Abdullah Univ. of Science and Technology (Saudi Arabia)
Citation:
Janjua 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.
Publisher:
SPIE
Journal:
Gallium Nitride Materials and Devices XII
Conference/Event name:
Gallium Nitride Materials and Devices XII
Issue Date:
16-Feb-2017
DOI:
10.1117/12.2250285
Type:
Conference Paper
Additional Links:
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2605114
Appears in Collections:
Conference Papers

Full metadata record

DC FieldValue Language
dc.contributor.authorJanjua, Bilalen
dc.contributor.authorNg, Tien Kheeen
dc.contributor.authorZhao, Chaoen
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorPrabaswara, Adityaen
dc.contributor.authorConsiglio, Giuseppe Bernardoen
dc.contributor.authorShen, Chaoen
dc.contributor.authorOoi, Boon S.en
dc.date.accessioned2017-05-04T06:39:20Z-
dc.date.available2017-05-04T06:39:20Z-
dc.date.issued2017-02-16en
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.en
dc.identifier.doi10.1117/12.2250285en
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.en
dc.publisherSPIEen
dc.relation.urlhttp://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2605114en
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.en
dc.subjectCircadian rhythmen
dc.subjectLaseren
dc.subjectLight emitting diodeen
dc.subjectNanowireen
dc.subjectSolid-state lightingen
dc.subjectVioleten
dc.subjectWhite lighten
dc.subjectYellowen
dc.titleHealth-friendly high-quality white light using violet-green-red laser and InGaN nanowires-based true yellow nanowires light-emitting diodesen
dc.typeConference Paperen
dc.contributor.departmentKing Abdullah Univ. of Science and Technology (Saudi Arabia)en
dc.identifier.journalGallium Nitride Materials and Devices XIIen
dc.conference.date2017-01-30 to 2017-02-02en
dc.conference.nameGallium Nitride Materials and Devices XIIen
dc.conference.locationSan Francisco, CA, USAen
dc.eprint.versionPublisher's Version/PDFen
kaust.authorJanjua, Bilalen
kaust.authorNg, Tien Kheeen
kaust.authorZhao, Chaoen
kaust.authorAnjum, Dalaver H.en
kaust.authorPrabaswara, Adityaen
kaust.authorConsiglio, Giuseppe Bernardoen
kaust.authorShen, Chaoen
kaust.authorOoi, Boon S.en
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