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Zinc oxide nanorods/polymer hybrid heterojunctions for white light emitting diodes
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-6235-7038
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
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2011 (English)In: JOURNAL OF PHYSICS D-APPLIED PHYSICS, ISSN 0022-3727, Vol. 44, no 22, 224017- p.Article in journal (Refereed) Published
Abstract [en]

Zinc oxide (ZnO) with its deep level defect emission covering the whole visible spectrum holds promise for the development of intrinsic white lighting sources with no need of using phosphors for light conversion. ZnO nanorods (NRs) grown on flexible plastic as substrate using a low temperature approach (down to 50 degrees C) were combined with different organic semiconductors to form hybrid junction. White electroluminescence (EL) was observed from these hybrid junctions. The configuration used for the hybrid white light emitting diodes (LEDs) consists of two-layers of polymers on the flexible plastic with ZnO NRs on the top. The inorganic/organic hybrid heterojunction has been fabricated by spin coating the p-type polymer poly (3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT : PSS) for hole injection with an ionization potential of 5.1 eV and poly(9, 9-dioctylfluorene) (PFO) is used as blue emitting material with a bandgap of 3.3 eV. ZnO NRs are grown on top of the organic layers. Two other configurations were also fabricated; these are using a single MEH PPV (red-emitting polymer) instead of the PFO and the third configuration was obtained from a blend of the PFO and the MEH PPV. The white LEDs were characterized by scanning electron microscope, x-ray diffraction (XRD), current-voltage (I-V) characteristics, room temperature photoluminescence (PL) and EL. The EL spectrum reveals a broad emission band covering the range from 420 to 800 nm, and the emissions causing this white luminescence were identified.

Place, publisher, year, edition, pages
Iop Publishing Ltd , 2011. Vol. 44, no 22, 224017- p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-68688DOI: 10.1088/0022-3727/44/22/224017ISI: 000290558300018OAI: oai:DiVA.org:liu-68688DiVA: diva2:419712
Note
Original Publication: Magnus Willander, Omer Nur, Siama Zaman, A Zainelabdin, Nargis Bano and I Hussain, Zinc oxide nanorods/polymer hybrid heterojunctions for white light emitting diodes, 2011, JOURNAL OF PHYSICS D-APPLIED PHYSICS, (44), 22, 224017. http://dx.doi.org/10.1088/0022-3727/44/22/224017 Copyright: Iop Publishing Ltd http://www.iop.org/ Available from: 2011-05-27 Created: 2011-05-27 Last updated: 2014-01-15

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