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Spiro-type orange phosphorescent host materials, 9-diphenylphosphine oxide-spiro[fluorene-7,9'-benzofluorene] (OPH-1P) and 5-diphenylphosphine oxide-spiro[fluorene-7,9'-benzofluorene] (OPH-2P) were successfully prepared by a lithiation reaction followed by a phosphination reaction with diphenylphosphinic chloride. The EL character-istics of OPH-1P and OPH-2P as orange host materials doped with iridium(III) bis(2-phenylquinoline) acetylacetonate (Ir(pq)

Orange Phosphorescent Organic Light-emitting Diodes Using a Spirobenzofluorene-type Phospine Oxides as Host Materials