BLUE-LIGHT-EMITTING ELECTROLUMINESCENT DEVICES WITH 2,9-DISUBSTITUTED1,10-PHENANTHROLINES

2,9-Diphenyl-1,10-phenanthroline derivatives 1 and 2, containing N,N-d imethylamino and tert-butyl groups at the p-positions of their phenyl units, respectively, were synthesized as the emitting materials for th e electroluminescent (EL) devices. The emission band of the device con taining 1 was observed at 485 nm, and that of 2 was at 460 nm. These e missions were visible under ordinary room lighting. The EL emission of the device containing 1 was identical to the photoluminescence but th at of the device containing 2 was revealed to be the exciplex emission . (C) 1997 Elsevier Science S.A.