High-Performance Phosphorescent Green OLEDs with A Simplified Device Structure via Substrate Surface Engineering
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초록
내용
Researchers have made significant efforts to simplify solution-processed organic light-emitting diode (OLED) design by removing the hole injection/transport layer (HIL/HTL) to reduce costs. Modifying the ITO anode or HIL/HTL has been crucial in achieving this goal. Here, we propose a strategy using dual self-assembled monolayers (SAMs) on the ITO substrate to simplify the device structure while maintaining efficiency. Pentafluorobenzyl phosphonic acid (F5BnPA) and perfluoroalkyl carboxylic acid are used as primary and secondary SAM modifiers, respectively. The SAMs-modified ITO anode showed an enhanced work function, reduced exciton quenching, and improved interface integrity with the emissive layer compared to the conventional ITO/ PEDOT: PSS. The best OLED device achieved a maximum current efficiency of 55.32 cd A−1 and an external quantum efficiency of 17.5%, demonstrating a promising design approach that maintains performance while reducing costs for future commercialization.