Synthesis and Characterization of DCM Derivatives for Red Light Emitting OLEDs

A novel red light emitting material, 2,6-dimethyl-4H-pyran-4'-ylidene)malononitrile (d-DCM) was synthesized and characterized. UV/visible absorption maximum is observed at 488 nm and emission maximum at 658 nm in solid film state, respectively. The organic light emitting diodes (OLEDs) with structure of indium tin oxide (ITO)/buffer layer/ hole transporting layer/ emitting layer/ electron transporting layer/ LiF/ Al. The hole transporting layer was composed of TPD and the electron transporting layer, which consists of Alq 3 , and emitting layer was composed of d-DCM. We investigated the characteristics of electroluminescence (EL) for OLEDs with red light emitting d-DCM.