Flexible nanogap polymer light-emitting diodes fabricated via adhesion lithography (a-Lith)
Georgiadou, Dimitra G
Castro, Fernando A
Anthopoulos, Thomas D
KAUST DepartmentKing Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
Permanent link to this recordhttp://hdl.handle.net/10754/628792
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AbstractWe report the development of coplanar green colour organic light-emitting diodes (OLEDs) based on asymmetric nanogap electrodes fabricated on different substrates including glass and plastic. Using adhesion lithography (a-Lith) we pattern Al and Au layers acting as the cathode and anode electrodes, respectively, separated by an inter-electrode distance of <15 nm with an aspect ratio of up to 106. Spin-coating the organic light-emitting polymer poly(9,9-dioctylfluorene-alt-bithiophene) (F8T2) on top of the asymmetric Al–Au nanogap electrodes results in green light-emitting nanogap OLEDs with promising operating characteristics. We show that the scaling of the OLED's width from 4 to 200 mm can substantially improve the light output of the device without any adverse effects on the manufacturing yield. Furthermore, it is found that the light-emitting properties in the nanogap area differ from the bulk organic film, an effect attributed to confinement of the conjugated polymer chains in the nanogap channel. These results render a-Lith particularly attractive for low cost facile fabrication of nanoscale light-emitting sources and arrays on different substrates of arbitrary size.
CitationWyatt-Moon G, Georgiadou DG, Zoladek-Lemanczyk A, Castro FA, Anthopoulos TD (2018) Flexible nanogap polymer light-emitting diodes fabricated via adhesion lithography (a-Lith). Journal of Physics: Materials 1: 01LT01. Available: http://dx.doi.org/10.1088/2515-7639/aadd57.
SponsorsThis work was supported by the European Union's Horizon 2020 research and innovation programme (under the Marie Skłodowska-Curie grant agreement 706707) and the Engineering and Physical Sciences Research Council (EPSRC) grant no. EP/G037515/1.
JournalJournal of Physics: Materials
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