A Spirobifluorene Derivative as a Single-Emitting Component for a Highly Efficient White Organic Electroluminescent Device



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 (170 nm)/4,4′,4′′-tris[N-(2-naphthyl)-N-phenylamino]triphenylamine (15 nm)/4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (65 nm)/TPSBF (50 nm)/tris(8-hydroxyquinoline)aluminum (30 nm)/LiF (0.8 nm)/Al (200 nm) exhibited a broad-spectrum white emission with a maximum luminescence and current efficiency of 57 680 cd m−2 and 6.51 cd A−1, respectively, and Commission International De l’Eclairage coordinates of (0.29,0.36).