Concentration-dependent luminescence of ionic liquids containing trialkyl(pentafluorocyclotriphosphazenyl)ammonium moieties.

Room-temperature ionic liquid compounds (CpzNR3(+)X(-)) consisting of trialkyl(pentafluorocyclotriphosphazenyl)ammonium (CpzNR3(+)) and anions (X(-)) such as chloride and bis(trifluoromethylsulfonyl)imide (TFSI(-)) emitted blue luminescence under an excitation of 360 nm. The luminescent quantum yields (Φem) of CpzNR3(+)X(-) were determined to be 0.012-0.