RESUMO
We describe how the morphology, photoluminescence (PL), and electroluminescence properties of 2,2',7,7'-tetrakis(pyren-1-yl)-9,9'-spirobifluorene (TPSBF) are related to its film thickness and how, under optimized conditions, the three main PL emissions constitute a form of white light. We fabricated high-brightness, broad-spectrum, white-light organic light-emitting diodes, incorporating a single emission layer of the blue-light-emitting material TPSBF, which comprises four pyrene units linked to a spirobifluorene core. An organic light-emitting device with the configuration indium tin oxide (170â nm)/4,4',4''-tris[N-(2-naphthyl)-N-phenylamino]triphenylamine (15â nm)/4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (65â nm)/TPSBF (50â nm)/tris(8-hydroxyquinoline)aluminum (30â nm)/LiF (0.8â nm)/Al (200â nm) exhibited a broad-spectrum white emission with a maximum luminescence and current efficiency of 57 680â cd m-2 and 6.51â cd A-1 , respectively, and Commission International De l'Eclairage coordinates of (0.29,0.36).