We report a new route for the design of electroluminescent polymers by grafting high-efficiency phosphorescent organometallic complexes as dopants and charge transport moieties onto alky side chains of fully conjugated polymers for polymer light-emitting diodes (PLED) with single layer/single polymers. The polymer system studied involves polyfluorene (PF) as the base conjugated polymer, carbazole (Cz) as the charge transport moiety and a source for green emission by forming an electroplex with the PF main chain, and cyclometalated iridium (Ir) complexes as the phosphorescent dopant. Energy transfer from the green Ir complex or an electroplex formed between the fluorene main chain and side-chain carbazole moieties, in addition to that from the PF main chain, to the red Ir complex can significantly enhance the device performance, and a red light-emitting device with the high efficiency 2.8 cd/A at 7 V and 65 cd/m2, comparable to that of the same Ir complex-based OLED, and a broad-band light-emitting device containing blue, green, and red peaks (2.16 cd/A at 9 V) are obtained.

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Key indicatorsSingle-crystal X-ray study T = 153 K Mean '(C±C) = 0.007 A Ê R factor = 0.050 wR factor = 0.094 Data-to-parameter ratio = 16.7For details of how these key indicators were automatically derived from the article, seeThe hydrated tris(dibenzoylmethanido)(o-phenanthroline)europium(III) complex, [Eu(DBM) 3 (Phen)]ÁxH 2 O, is converted ef®ciently into anhydrous tris(dibenzoylmethanido)(ophenanthroline)europium(III), [Eu(DBM) 3 (Phen)] or [Eu-(C 15 H 11 O 2 ) 3 (C 12 H 8 N 2 )], by heating under vacuum. The title compound has been characterized by FT±IR, 1 H and 13 C NMR spectroscopy, and X-ray diffraction methods. It crystallizes in the triclinic space group P1 with ®ve molecules in the asymmetric unit, without any pseudosymmetry. The trivalent europium ion is eight-coordinate, and the coordination polyhedron can best be described as a slightly distorted square antiprism.

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