Green and Reddish-Orange Light-Emitting Electrochemical Cells Using Cationic Iridium (III) Phenanthroline Complexes

Abstract

A new series of cationic heteroleptic iridium(III) complexes with phenanthroline based-ancillary ligands, namely, [Ir(ppy)₂(dmphen)]PF_6, [Ir(ppy)₂(dbphen)]PF₆ and [Ir(ppy)₂(dpphen)]PF₆ (ppy is 2-phenylpyridine, dmphen is 2,9-dimethyl-1,10-phenanthroline, dbphen is 2,9-dibutyl-1,10-phenanthroline, dpphen is 2,9-diphenyl-1,10-phenanthroline and PF₆ is hexafluorophosphate) have been synthesized and characterized by various spectroscopic methods. These synthesized complexes were used for the fabrication of single component light-emitting electrochemical cells (LECs). The electroluminescent devices were evaluated on the basis of electroluminescence properties and the effect of substituents on the phenanthroline ligands tune the emission color of the complexes.

Keywords:

• Cationic iridium complex
• electroluminescence properties
• light-emitting electrochemical cells
• optoelectronic devices

Acknowledgments

This research was supported by a 2-Years Research Grant of Pusan National University and Brain Korea 21 Plus project.