Furo[3,2‐c]pyridine‐Based Iridium Complex Containing two Methoxy Groups for Efficient Solution‐Processed Phosphorescent OLEDs

Abstract

AbstractA furo[3,2‐c]pyridine‐based iridium complex, namely [(3,5‐diMeOpfupy)2Ir(acac)], has been designed and synthesized by introducing two methoxy groups at the 3‐ and 5‐positions of a phenyl ring. Such a small structure variation of the ligand can not only avoid isomer production to favor easy purification, but also improve the solubility to ensure low‐cost wet methods. Similar to the model complex [(3‐MeOpfupy)2Ir(acac)] containing one methoxy group, [(3,5‐diMeOpfupy)2Ir(acac)] possesses an orange emission peak at 598 nm together with a photoluminescence quantum yield (PLQY) of 0.32 and an exciton lifetime of 1.29 μs. The corresponding solution‐processed devices realize a maximum current efficiency of 17.2 cd/A (18.5 lm/W, 8.9 %) as well as Commission Internationale de L'Eclairage (CIE) coordinates of (0.60, 0.39). The result indicates that the multiple methoxy modification is a promising strategy towards isomer‐free and solution‐processable furo[3,2‐c]pyridine‐based iridium complexes.