Open Access#12008
Iridium Complexes with Cyclometalated 2-Cycloalkenyl-Pyridine Ligands as Highly Efficient Emitters for Organic Light-Emitting Diodes
Iridium complexes containing cyclometalated 2-cyclohexenylpyridine derivatives with rigid and bulky cyclohexene units are synthesized, and found to be highly efficient materials in EL devices (see figure). Devices based on these iridium complexes emit yellowish- green light with the very high external quantum efficiency of 18.7%. ; This work was supported by a Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2006-005- D00251), partially supported by the Strategic Technology Development Program (10030814), and partially supported by the Ministry of Commerce