Abstract
Two small non-aromatic organic molecules, 1,2,3,4,5,6,7,8,9,10-decahydro-1,8-acridinedione (DAD) and 3,3,6,6-tetramethyl-1,2,3,4,5,6,7,8,9,10-decahydro-1,8-acridinedione (TDAD) were synthesized and used as blue light-emitting dopants in organic electroluminescent devices. A general device structure, ITO/NPB (20 nm)/CBP (20 nm)/DAD:TPBI ( X%, Y nm)/TPBI ( Z nm)/Mg:Ag (10:1; 55 nm)/Ag (100 nm) was employed for this study, where NPB, CBP and TPBI stand for 4,4′-bis[ N-(1-naphthyl)- N-phenyl-amino]-biphenyl, 4,4′-dicarbazolyl-1,1′-biphenyl and 2,2′,2″-(1,3,5-phenylene)tris-[1-phenyl-1 H-benzimidazole], respectively. Efficient blue emission with excellent Commission Internationale de L’Eclairage (CIE) coordinates ( X=0.15, Y=0.08) and maximum luminance >1000 cd/m 2 were obtained from the devices. The performances of the devices depend greatly on the dopant concentration and thickness of the emitting layer.
Published Version
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