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).