Synthesis and Properties of Thermally Cross-linkable Fluorene-Based Polymer as Hole Injection Material for Solution-Processed OLEDs
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초록
내용
Organic Light-emitting diode (OLED) fabrication methods include vacuum deposition and solution processes. Among them, it is an important problem to not dissolve each layer without mixing when depositing another layer on one organic layer when manufacturing an OLED by a solution process. Poly-(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) is currently widely used as the HIL of solution process OLEDs because it has water-soluble properties that do not mix with other organic layers. But it has strong acid ( ~ ph 1.5), so it damages ITO and causes indium ions to diffuse into HIL. In this study, a thermally cross-linkable hole injection material (HIM) that can replace PEDOT:PSS was synthesized to create a layer that is insoluble network film. As a result, the use of HIM for HIL instead of PEDOT:PSS was confirmed that the thin film was smoother as an organic layer, and shows good solvent resistance and show excellent performance.