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Title: ZnO nanorod arrays as electron injection layers for efficient organic light emitting diodes
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
Issue Date: 24-Nov-2016
Publisher: Wiley
Description: 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.
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Type Of Material: OTHER
Appears in Collections:Faculty of Engineering

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