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Organic Electroluminescent (EL) devices have received a great deal of attention in view of their application as full-color, flat-panel displays as well as academic interest. There have been extensive studies of organic EL devices directed toward achieving high brightness and multior full-color emission, and in particular, improving the durability and thermal stability of the devices. Both polymers and small molecules have been studied for use in organic EL devices [1,2]. Low molecular-weight organic compounds that readily form stable amorphous glasses, namely, amorphous molecular materials, are promising candidates for use in organic EL devices [3]. They permit the formation of smooth, uniform amorphous thin films by vacuum deposition or by coating from solution. With regard to low molecular-weight emitting materials, tris(8-quinolinolato)aluminum (Alq3) has been used most extensively as a greenemitting material with electron-transporting properties. Blueor greenish blue-emitting materials for organic EL devices have also been reported, including oxadiazole derivatives [4], distyrylarylene derivatives [5], a triazole derivative [6], spiro-linked compounds [7] and trip-terphenyl-4-yl)amine [8]. Organic EL devices using these emitting materials have been reported to exhibit brightness of approximately 1,000 cd m'2 except for 4,4'-bis(2,2-diphenylethenyl)biphenyl. Blueor greenish blue-emitting materials with high performance still remain to be developed. We report here a new greenish blue-emitting amorphous molecular material, 2,5-bis {4-(2naphthyl(phenyl)aminophenyl}thiophene (BNpAlT) and the fabrication and performance of an organic EL device using BNpA-1T as the emitting material.

Development of a New Greenish Blue-emitting Amorphous Molecular Material 2,5-Bis{4-[2-naphthyl(phenyl)amino]phenyl}thiophene.