Fabrication of junction-free Ag fiber electrodes for flexible organic light-emitting diodes (OLEDs) is demonstrated. The junction-free Ag fiber electrodes are fabricated by electrospun polymer fibers used as an etch mask and wet etching of Ag thin film. This process facilitates surface roughness control, which is important in transparent electrodes based on metal wires to prevent electrical instability of the OLEDs. The transmittance and resistance of Ag fiber electrodes can be independently adjusted by controlling spinning time and Ag deposition thickness. The Ag fiber electrode shows a transmittance of 91.8% (at 550 nm) at a sheet resistance of 22.3 Ω □−1, leading to the highest OLED efficiency. In addition, Ag fiber electrodes exhibit excellent mechanical durability, as shown by measuring the change in resistance under repeatable mechanical bending and various bending radii. The OLEDs with Ag fiber electrodes on a flexible substrate are successfully fabricated, and the OLEDs show an enhancement of EQE (≈19%) compared to commercial indium tin oxide electrodes.
Bibliographical noteFunding Information:
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (No. 2016R1A2B4014073) and the Ministry of Education (No. NRF-2017R1D1A1B03036520), and the Technology Development of Low cost Flexible Lighting Surface, which is a part of the R&D program of Electronics and Telecommunications Research Institute (ETRI).
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- flexible electronics
- metal fibers
- organic light-emitting didoes (OLEDs)
- transparent electrodes
ASJC Scopus subject areas
- Engineering (miscellaneous)
- Materials Science(all)