Innovative Design Strategy for V-shaped Host Materials Optimized for Solution-Processed TADF-OLEDs
발표자
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초록
내용
A novel core molecule for V-shaped host molecules was synthesized, wherein two carbazoles were directly linked to cyclohexane (Cy). Cy-mCP and Cy-mCBP hosts were also successfully prepared for solution-processable thermally activated delayed fluorescence organic light-emitting diodes (TADF−OLEDs). The Cy-mCP and Cy-mCBP molecules exhibited twice the molecular weight while maintaining the basic properties of a single host molecule with improved film-forming ability and solubility in organic solvents. These Cy-typed host molecules showed superior thermal stability and high glass transition temperatures compared to single host molecules. Green TADF−OLEDs were prepared using the Cy-typed host molecules and t4CzIPN green emitter, achieving device efficiencies similar to that of a single host molecule. The synthesis of V-shaped molecules by directly linking two carbazoles to a cyclohexane linker is promising for the development of different hosts for solution-processable OLEDs.