Aluminum and zinc complexes of 4-substituted 8-hydroxyquinoline were used effectively as emissive materials in light-emitting diodes (LED). The substituents chosen in this study were p-methoxy-2-styryl, p-diethylamino-2-styryl, and naphthalene-2-vinyl groups. Their emission spectra were red-shifted with respect to that of aluminum tris(hydroxyl quinol ate) (Alq(3)) as a result of extending their pi-conjugation. All complexes formed amorphous glasses, which exhibited high thermal and electrical stability. Typical LED devices were fabricated by mixing the dyes with polyvinylcarbazole and spin-coated to form thin films, which were sandwiched between ITO (indium tin oxide) and a metal electrode. These devices displayed yellow-orange emissions with quantum efficiency ca. 0.4%.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY Volume: 51 Issue: 4 Pages: 735-742
