ZnO nanorod arrays as electron injection layers for efficient organic light emitting diodes

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Title: ZnO nanorod arrays as electron injection layers for efficient organic light emitting diodes
Author(s): Faria, JCD
Campbell, AJ
McLachlan, MA
Item Type: Journal Article
Abstract: Nanostructured oxide arrays have received significant attention as charge injection and collection electrodes in numerous optoelectronic devices. Zinc oxide (ZnO) nanorods have received particular interest owing to the ease of fabrication using scalable, solution processes with a high degree of control of rod dimension and density. Here, vertical ZnO nanorods as electron injection layers in organic light emitting diodes are implemented for display and lighting purposes. Implementing nanorods into devices with an emissive polymer, poly(9,9-dioctyluorene-alt-benzothiadiazole) (F8BT) and poly(9,9-di-n-octylfluorene-alt-N-(4-butylphenyl)dipheny-lamine) (TFB) as an electron blocking layer, brightness and efficiencies up to 8602 cd m−2 and 1.66 cd A−1 are achieved. Simple solution processing methodologies combined with postdeposition thermal processing are highlighted to achieve complete wetting of the nanorod arrays with the emissive polymer. The introduction of TFB to minimize charge leakage and nonradiative exciton decay results in dramatic increases to device yields and provides an insight into the operating mechanism of these devices. It is demonstrated that the detected emission originates from within the polymer layers with no evidence of ZnO band edge or defect emission. The work represents a significant development for the ongoing implementation of ZnO nanorod arrays into efficient light emitting devices.
Publication Date: 18-Jun-2015
Date of Acceptance: 5-May-2015
URI: http://hdl.handle.net/10044/1/42675
DOI: http://dx.doi.org/10.1002/adfm.201501411
ISSN: 1616-3028
Publisher: Wiley
Start Page: 4657
End Page: 4663
Journal / Book Title: Advanced Functional Materials
Volume: 25
Issue: 29
Copyright Statement: © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article, 'ZnO Nanorod Arrays as Electron Injection Layers for Efficient Organic Light Emitting Diodes', which has been published in final form at: http://dx.doi.org/10.1002/adfm.201501411.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Kaust
Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/F056362/1
EP/J016039/1
N/A
EP/G037515/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
conjugated polymers
nanorods
organic electronics
light-emitting diodes
zinc oxide
HYDROTHERMAL GROWTH
PHOTOVOLTAIC DEVICES
PPV HETEROSTRUCTURE
OPTICAL-PROPERTIES
SOLAR-CELLS
ELECTROLUMINESCENCE
MORPHOLOGY
NANOSTRUCTURES
COPOLYMER
ALIGNMENT
Materials
03 Chemical Sciences
09 Engineering
02 Physical Sciences
Publication Status: Published
Appears in Collections:Materials
Physics
Experimental Solid State
Faculty of Natural Sciences



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