Journal
SYNTHETIC METALS
Volume 242, Issue -, Pages 99-102Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2018.05.009
Keywords
White organic light-emitting diodes; Conductive polymers; Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate); Transparent electrodes
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2016R1C1B2012490]
- National Research Foundation of Korea [22A20130012426, 2016R1C1B2012490] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report high performance white organic light-emitting diodes (OLEDs) based on high conductivity poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films optimized by a solvent post treatment. The device stack is carefully optimized with high efficiency tandem structures including red, yellow/green, and blue emissive materials. The OLED with the PEDOT:PSS transparent electrode achieves a high power efficiency of 26.11m/W and an external quantum efficiency of 19.3%, which are comparable to the reference indium tin oxide (ITO)-based OLEDs. In addition, it is observed that the angular emission characteristic of PEDOT:PSS-based OLEDs is closer to Lambertian distribution compared to that of the ITO-based OLED. We show that the optimized device stack together with post-treated PEDOT:PSS transparent electrodes can realize high performance ITO-free white OLEDs.
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