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The morphological control of PEDOT:PSS top electrode for transparent organic light-emitting diodes
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- Authors
- Hyuckjin Nam, Hyunsu Cho, Harin Lee, Ho Jin Son, Changhun Yun
- Issue Date
- 2025-04
- Citation
- Journal of Industrial and Engineering Chemistry, v.권호미정, pp.1-10
- ISSN
- 1226-086X
- Publisher
- Korean Society of Industrial Engineering Chemistry
- Language
- English
- Type
- Journal Article
- Abstract
- Owing to the enormous interest in transparent organic light-emitting diodes (T-OLEDs) for emerging displays and smart packaging, the importance of the top Transparent Electrode (TE) has increased. Instead of the thin metal film used in conventional T-OLEDs, the conductive polymer poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) has been widely studied as a top TE for the widespread deployment of T-OLEDs with weak-microcavity effects. In present study, a facile method is reported for controlling the optoelectrical property of the PEDOT:PSS layer by mixing highly conductive and hole-injecting PEDOT:PSS solutions with distinct PEDOT to PSS ratios. During the annealing process at 200 °C, the phase transition of PSS chains from PSS-rich domains initiates thermally-induced phase separation, and a nanostructural change in the PEDOT:PSS thin film occurs depending on the mixing ratio. The T-OLED with the optimized LTE exhibits a total external quantum efficiency of 3.3 % and a turn-on voltage of 2.5 V, thereby providing a superior performance to that of the opaque device with a strong micro-cavity effect. Moreover, optical simulations indicate that the morphology of the PEDOT:PSS film determines the light-output asymmetry with respect to the bottom and top directions by changing the position of the emission zone in the emissive layer.
- KSP Keywords
- 4-ethylenedioxythiophene):poly(4-styrenesulfonate)(PEDOT:PSS), 4-styrenesulfonate(Poly), External Quantum Efficiency, Facile method, Mixing ratio, Morphological control, Optical simulation, PEDOT:PSS layer, PEDOT:PSS thin film, Phase transition, Thermally-induced phase separation