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Defect-induced infrared electroluminescence from radial GaInP/AlGaInP quantum well nanowire array light- emitting diodes
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS). Solid State Physics and NanoLund, Lund University, Lund, Sweden.ORCID iD: 0000-0003-1598-907X
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS). Solid State Physics and NanoLund, Lund University, Lund, Sweden.ORCID iD: 0000-0002-3160-8540
Solid State Physics and NanoLund, Lund University, Lund, Sweden.
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS). Solid State Physics and NanoLund, Lund University, Lund, Sweden.ORCID iD: 0000-0001-5993-8106
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2017 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 28, no 48, article id 485205Article in journal (Refereed) [Artistic work] Published
Abstract [en]

Radial GaInP/AlGaInP nanowire array light-emitting diodes (LEDs) are promising candidates for novel high-efficiency solid state lighting due to their potentially large strain-free active emission volumes compared to planar LEDs. Moreover, by proper tuning of the diameter of the nanowires, the fraction of emitted light extracted can be significantly enhanced compared to that of planar LEDs. Reports so far on radial growth of nanowire LED structures, however, still point to significant challenges related to obtaining defect-free radial heterostructures. In this work, we present evidence of optically active growth-induced defects in a fairly broad energy range in vertically processed radial GaInP/AlGaInP quantum well nanowire array LEDs using a variety of complementary experimental techniques. In particular, we demonstrate strong infrared electroluminescence in a spectral range centred around 1 eV (1.2 μm) in addition to the expected red light emission from the quantum well. Spatially resolved cathodoluminescence studies reveal a patchy red light emission with clear spectral features along the NWs, most likely induced by variations in QW thickness, composition and barriers. Dark areas are attributed to infrared emission generated by competing defect-assisted radiative transitions, or to trapping mechanisms involving non-radiative recombination processes. Possible origins of the defects are discussed. © 2017 IOP Publishing Ltd

Place, publisher, year, edition, pages
Bristol: Institute of Physics Publishing Ltd. , 2017. Vol. 28, no 48, article id 485205
Keywords [en]
radial core-shell nanowires, light-emitting diode, GaInP LED, nanowire LED, infrared emission, defect-induced emission
National Category
Nano Technology
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URN: urn:nbn:se:hh:diva-35497DOI: 10.1088/1361-6528/aa913cISI: 000415052500002Scopus ID: 2-s2.0-85033687191OAI: oai:DiVA.org:hh-35497DiVA, id: diva2:1160930
Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2018-04-03Bibliographically approved

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Hussain, LaiqKarimi, MohammadJain, VishalPettersson, Håkan

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