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

摘要

A new electrophosphorescent material, iridium(III)tris(5-(2,4-difluoro-phenyl)-10,10-dimethyl-4-aza-tricycloundeca-2,4,6-triene), Ir(F_2-mppy)_3, has been synthesized and characterized. Ir(F_2-mppy)_3 shows strong blue emission peaking at 475 nm with a high phosphorescent quantum yield (Φ_(PL)) of 0.72 in degassed toluene. Electroluminescent devices with a structure of indium tin oxide (ITO)/NPB (40 nm)/Ir(F_2-mppy)_3(x):CBP (30 nm)/BCP (6 nm)/Alq_3 (20 nm)/Mg:Ag (10:1) and 15% (10%) exhibit a maximum luminous power efficiency of 9.58 lm/W (7.68 lm/W), CIE coordinates (x = 0.18, y = 0.36) (x = 0.17,y = 0.29), and a maximum luminance of ～9000 cd/m~2 at 12.5 V (～6000 cd/m~2 at 11.5 V).