Solution-processed inverted polymer light-emitting diodes with transferred PEDOT:PSS top anodes (Conference Presentation)

Jongjang Park; Geonhee Kim; Hyungsoo Yoon; Sujin Jeong; Seunghwan Lee; Yongtaek Hong

doi:10.1117/12.2508619

8 March 2019 Solution-processed inverted polymer light-emitting diodes with transferred PEDOT:PSS top anodes (Conference Presentation)

Jongjang Park, Geonhee Kim, Hyungsoo Yoon, Sujin Jeong, Seunghwan Lee, Yongtaek Hong

Author Affiliations +

Proceedings Volume 10942, Advances in Display Technologies IX; 109420G (2019) https://doi.org/10.1117/12.2508619
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

We fabricated all solution-processed inverted polymer light emitting diodes (PLEDs) where functional layers were spin-coated on patterned-ITO glass substrates and PEDOT:PSS anodes were deposited by a transfer process. The structure of our devices is ITO (cathode) / ZnO (EITL) / PEI (interlayer) / PDY-132 (EML) / PEDOT:PSS (HITL) / transferred conductive PEDOT:PSS (anode). Although many groups have studied all solution-processed PLEDs, top electrodes were typically fabricated by photolithography or adhesive tape, which hinders low-cost and large-area mass production. In order to fabricate top electrodes which will not damage underlying organic layers and can be implemented in a facile manner, we used the transfer process. PEDOT:PSS was selected as the top electrodes because it can be patterned by a printing process such as an inkjet printing technique, and then the patterned PEDOT:PSS electrodes can be easily transferred. We fabricated two types of inverted PLEDs which have an evaporated Al or a transferred PEDOT:PSS top electrode. The device with the evaporated Al showed a turn-on voltage of 2.6 V defined at 1 cd/m2 and a current efficiency of 10.2 cd/A at 1000 cd/m2 while the one with the transferred PEDOT:PSS showed a turn-on voltage of 2.7 V and a current efficiency of 8.2 cd/A at the same condition. Difference in sheet resistance of the top electrode and thus, charge balance change probably caused the performance variation. When the bottom cathodes are inkjet-printed, all solution-processed inverted PLEDs can be implemented, which will be also presented at conference.

Conference Presentation

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Jongjang Park, Geonhee Kim, Hyungsoo Yoon, Sujin Jeong, Seunghwan Lee, and Yongtaek Hong "Solution-processed inverted polymer light-emitting diodes with transferred PEDOT:PSS top anodes (Conference Presentation)", Proc. SPIE 10942, Advances in Display Technologies IX, 109420G (8 March 2019); https://doi.org/10.1117/12.2508619

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KEYWORDS

Organic light emitting diodes

Electrodes

Aluminum

Inkjet technology

Printing

Adhesives

Glasses

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