Novel Organic Composites Based on N-Substituted Quinacridone Derivatives for Molecular Organic Light-Emitting Diodes
Molecular organic light emitting diodes (MOLEDs) where the active emitting layer has been doped with quinacridones (DHQ), ethyl (DEQ) and benzyl (DBQ) N-substituted quinacridones have been fabricated by high vacuum vapor deposition. These very bright and highly efficient MOLEDs are compared in terms of optimum dopant concentration, spectral characteristics and device efficiencies. DHQ, DEQ and DBQ aggregates formed by plane to plane stacking seem to be responsible for luminescence quenching observed at high dopant concentration. Intermolecular hydrogen bonding between the N-H moiety and the carbonyl oxygen does not play a major role in the quenching process for DHQ-doped AlQ3 composites.
KeywordsComposite Film Dopant Concentration Guest Molecule Intermolecular Hydrogen Bonding Carbonyl Oxygen
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