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Oxadiazolopyridine compounds have seen synthesized with the aim of preparing red fluorescent organic material for organic electrolum inescent devices. 10-Oxoindenooxadiazolopyridines, which were synth...esized from acetophenone derivatives in 4 steps, show red fluorescence in the solid state, albeit with a weak intensity. 10-Hydroxy derivatives emit fluorescence of yellow to orange color, however these compounds are instable in air. Oxadiazolopyridenes having thiophene and furan rings at the 4- and 7-positions, prepared from the corresponding heterocyclic methyl ketones, emit intense red fluorescence above 600nm in the solid state. Of special note is 4,7-di(5'-phenyl-2'-thienyl)oxadiazolopyridine which shows red fluorescence at 669nm. An EL device using 5'-phenyl-2'-thienyl derivative as a light-emitting materials was fabricated by Kyushu Matsushita corporation. This device emitted red EL at 680nm. In the cyclic voltammogram, oxadiazolopyridines show a reversible redox wave at -0.9～-1.17V. The oxadiazolopyridine ring having an electron-withdrawing substituent was reduced at low cathodic potential.続きを見る
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Mendeley出力
KJ00004507936