Sky-blue phosphorescent organic light-emitting diodes with dibenzo-24-crown-8 substituted iridium(III) complexes as the dopants

Several sky-blue phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated by spin-coating technique, using dibenzo-24-crown-8 unit-based iridium complexes (B1, B2 and B3) as the dopants and poly(N-vinylcarbazole) (PVK) as the polymer host. The PhOLEDs based on B3 exhibited the best electroluminescent performances with a maximum luminous efficiency of 10.7 cd A−1 and a maximum brightness of 4604 cd m−2.286