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 (20nm)/CBP (20nm)/DAD:TPBI (X%, Ynm)/TPBI (Znm)/Mg:Ag (10:1; 55nm)/Ag (100nm) 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-1H-benzimidazole], respectively. Efficient blue emission with excellent Commission Internationale de L'Eclairage (CIE) coordinates (X=0.15, Y=0.08) and maximum luminance <1000cd/m <sup>2</sup> were obtained from the devices. The performances of the devices depend greatly on the dopant concentration and thickness of the emitting layer. © 2003 Elsevier Science B.V. All rights reserved.