Innovative trilayer organic light emitting transistor (OLET) structure for blue emission

We report on a three-layer organic light-emitting transistor (3L- OLET) comprising a novel set of semiconductors as transport layers, 2,7-Dioctyl[1]benzothieno[3,2-bj[1 jbenzothiophene (C8- BTBT) and 2,5-bis[4-(heptadecafluorooctyl)phenyl]thieno[3,2- bjthiophene (N-F2-6). These materials, combined with an emissive layer of a 4,4'-Bis(N-carbazolyl)-1,1'-biphenyl (CBP) derivativef 4,4 -bis(3,6-dineopentyl-9H-carbazole-9-yl)- 1, - biphenyl (NP4-CBP) and a new dye (BLUE1), have been used to obtain blue electroluminescent device.