A spirobifluorene derivative as a single-emitting component for a highly efficient white organic electroluminescent device

摘要

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 (170a nm)/4,4′,4′′-tris[N-(2-naphthyl)-N- phenylamino]triphenylamine (15a nm)/4,4′-bis[N-(1-naphthyl)-N-phenylamino] biphenyl (65a nm)/TPSBF (50a nm)/tris(8-hydroxyquinoline)aluminum (30a nm)/LiF (0.8a nm)/Al (200a nm) exhibited a broad-spectrum white emission with a maximum luminescence and current efficiency of 57 680a cd m-2 and 6.51a cd A-1, respectively, and Commission International De l'Eclairage coordinates of (0.29,0.36). All aglow: High-brightness, broad-spectrum, white-light organic light-emitting diodes, incorporating a single emission layer of the blue-light-emitting material 2,2′,7,7′-tetrakis(pyren-1-yl)- 9,9′-spirobifluorene (TPSBF), which comprises four pyrene units linked to a spirobifluorene core, are described (see figure).