Newly prepared water-soluble iridium phosphorescent complexes, trans-[Ir(ppy)(PAr3)2(H)L]0,+ (ppy = bidentate
2-phenylpyridinato anionic ligand; L= Cl (1), CO (2), CN- (3); H being trans to the nitrogen of ppy ligand; PAr3
(TPPTS) = P(m-C6H4SO3Na)3), have been synthesized and characterized. Those complexes containing water-soluble
phosphine ligands can emit any color region as altering cyclometalated ligands in aqueous media with
high quantum efficiencies. Even though these water-soluble phosphorescent iridium complexes can be the
sensing probe for toxic CO gas and CN anion, they will be capable of promising materials in the solution
processible OLED applications.