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Hexagonal arrays of nanoscale holes or metal dots (25nm in diameter and 39nm in period), with orientational order extending over the entire square-centimeter array area, were fabricated on unpatterned silicon wafer substrates using a shear-aligned sphere-forming diblock copolymer template. Since two or more layers of spherical nanodomains are required to achieve alignment in the block copolymer film, but pattern transfer requires a single layer, a multistep etching process was developed, whereby the top layer of a shear-aligned bilayer was evenly removed, leaving the ordered bottom layer as the fabrication template for hole and dot arrays free from grain boundaries.

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A series of PPV derivatives bearing substituted and unsubstituted carbazole and 2‐ethylhexyloxy pendants were prepared and their photo‐ (PL) and electroluminescence (EL) properties were studied. Substituted carbazole structures were N‐phenylcarbazole and 3,6‐dimethoxycarbazole. The substituents on the carbazole pendants caused little change in UV‐vis absorption, PL, and EL when compared with the polymer bearing the unsubstituted carbazole pendants. The presence of the benzene ring between the main chain and the carbazole pendant increased the threshold electric field in EL. We could obtain maximum brightness of ca. 17,000 ‐ 30,000 cd/m2 for the polymers carrying the unsubstituted and dimethoxy substituted carbazole pendants.

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