Photoluminescence and electroluminescence of a new blue-emitting homoleptic iridium complex

A new electrophosphorescent material, iridium(III)tris(5-(2,4-difluoro-phenyl)-10,10- dimethyl-4-aza-tricycloundeca-2,4,6-triene), Ir(F2-mppy)3, has been synthesized and characterized. Ir(F2-mppy)3 shows strong blue emission peaking at 475nm with a high phosphorescent quantum yield (ΦPL) of 0.72 in degassed toluene. Electroluminescent devices with a structure of indium tin oxide (ITO)/NPB (40nm)∕Ir(F2-mppy)3(x):CBP (30nm)/BCP (6nm)∕Alq3 (20nm)∕Mg:Ag (10:1) and 15% (10%) exhibit a maximum luminous power efficiency of 9.58lm∕W (7.68lm∕W), CIE coordinates (x=0.18,y=0.36) (x=0.17,y=0.29), and a maximum luminance of ∼9000cd∕m2 at 12.5V (∼6000cd∕m2 at 11.5V).