| Abstract
| - Three 8-hydroxyquinolato (q) boron compounds B(C2H5)2q (1), BPh2q (2), and B(2-naph)2q(3) have been synthesized by the reaction of 8-hydroxyquinoline with an appropriate BR3compound. Compounds 1−3 have a tetrahedral geometry as demonstrated by the structureof 1 determined by a single-crystal X-ray diffraction analysis. Compounds 1−3 emit a green-blue color at λmax = 495−500 nm when irradiated by UV light. The electroluminescent (EL)properties of 2 and 3 were examined by fabricating EL devices using 2 and 3 as the light-emitting layer, respectively. The devices of 2 produce a yellow-green light with broad emissionspectra, attributed to the formation of an exciplex of 2 with the N,N‘-di-1-naphthyl-N,N‘-diphenylbenzidine (NPB) in the hole transport layer while the intrinsic EL emission ofcompound 3 was observed. Both 2 and 3 were found to be good electron transport materialsin EL devices.
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