ITO-free solution-processed polymer light-emitting diodes with embedded AgNW-transferred PEDOT:PSS (Conference Presentation)

Geonhee Kim; Jongjang Park; Seunghwan Lee; Changhee Lee; Yongtaek Hong

doi:10.1117/12.2508163

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8 March 2019 ITO-free solution-processed polymer light-emitting diodes with embedded AgNW-transferred PEDOT:PSS (Conference Presentation)

Geonhee Kim, Jongjang Park, Seunghwan Lee, Changhee Lee, Yongtaek Hong

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Proceedings Volume 10942, Advances in Display Technologies IX; 109420Q (2019) https://doi.org/10.1117/12.2508163
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

We fabricated solution-processed transparent silver nanowires (AgNWs) electrodes and applied them to anodes of polymer light-emitting diodes (PLEDs). While patterning methods of the AgNW electrodes in previous research were rather expensive and complicated, we used a transfer method. The AgNW electrodes were fabricated by transferring AgNWs from polydimethylsiloxane (PDMS) stamp to inkjet-printed poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) without lithographic patterning. However, due to the rough surface property of the AgNWs placed on the PEDOT:PSS film, AgNW/PEDOT:PSS electrodes cannot be directly employed as the bottom electrode of PLEDs. Therefore, to reduce the surface roughness, they were embedded onto ultraviolet-curable photopolymer, enabling the PEDOT:PSS films to be placed on the AgNWs. The embedded PEDOT:PSS/AgNW electrodes exhibited a sheet resistance of 18.4 Ω/sq and transmittance of 85.6 % at the 550 nm wavelength, which were comparable with those of indium tin oxide (ITO). In addition, the surface roughness of embedded electrodes decreased from 26.8 nm to 11.8 nm in root-mean-square value. We fabricated the PLEDs with the embedded anode, which have a structure of anodes / PEDOT:PSS (HIL) / PDY-132 (EML) / LiF / Al (cathode) on the PEN substrates. As a result, the PLEDs with the embedded anodes showed a current efficiency of 7.1 cd/A and a power efficiency of 2.9 lm/W at 1000 cd/m2. Furthermore, they operated well under a constant current due to reduction of surface roughness without the high leakage current. The mechanical property of embedded AgNWs-transferred PEDOT:PSS electrodes and optimization of PLEDs with them can be presented at conference.

Conference Presentation

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Geonhee Kim, Jongjang Park, Seunghwan Lee, Changhee Lee, and Yongtaek Hong "ITO-free solution-processed polymer light-emitting diodes with embedded AgNW-transferred PEDOT:PSS (Conference Presentation)", Proc. SPIE 10942, Advances in Display Technologies IX, 109420Q (8 March 2019); https://doi.org/10.1117/12.2508163

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