119th General Meeting of the KCS

Type Poster Presentation
Area 공업화학
Room No. 포스터발표장
Time 4월 20일 (목요일) 11:00~12:30
Code IND.P-8
Subject Emissive Cyclometalated Ir(III) Complexes: Synthesis, Characterization, Photophysical properties and DFT calculations
Authors 손미랑, 김철훈, 강상욱, 손호진*
고려대학교 신소재화학과, Korea
Abstract A series of homoleptic cyclometalated iridium(III) complexes having phenylimidazole ligands were prepared to study emission properties pertinent to the phenylimidazole ligands. Ir complexes bore tris-C^N-chelated hexa-coordinated metal centers with exclusive meridional conformation: products were Ir(dmp)3, Ir(dmp-CH3)3, Ir(dmp-F)3 and Ir(dmp-CF3)3 in which phenylimidazole ligands varied in the para-position of the phenyl group with H, CH3, F and CF3 groups. Systematic emission color change was apparent within the context of electron withdrawing substituents on going from phenyl to trifluoromethyl group. Density-functional theory (DFT) calculations estimated the emissive triplet states that were closely examined by photodynamic studies. Due to the bulky planar nature of the ligand, 3MLCT was a dominant emissive origin and this ensured stability of the complexes accordingly. Device fabrication led to potency of this bulky planar ligand and device performance and ligand structure relationship will be discussed.
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