| 초록 |
A series of heteroleptic Iridium complexes with phenylpyridine (ppy) ligands substituted with sulfonyl group on the phenyl ring. Phosphorescence origin of the sulfonyl group has been studied and emissive 3LC and 3MLCT were found to be directly related to emission quantum yield as well as emission color. To correlate 3LC and 3MLCT contributions at the ppy and the iridium metal center related heteroleptic series was proposed whose cyclometallated derivatives possess a structure of Ir(C^N)2(ancillary ligand), where main ligand was C^N = 3-(pyridin-2-yl)benzene-1-sulfonyl fluoride (SO2F) and ancillary ligand were acetylacetone (acac), borate (bor) and picolinate (pic). Within the context to delineate the sulfonyl group effect, emission properties of the ancillary ligands have been scrutinized by means of emission photo-kinetics: a blue-shift emission is observed on going from acac (λmax = 490 nm) to bor (λmax = 460 nm). |
