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-6
Subject Series of Sulfonyl-Substituted Heteroleptic Iridium(III) Complexes with Tunable Emission Wavelength and Excited State Properties:  Structures, Theoretical Calculations, and Photophysical and Electrochemical Properties
Authors 김진형, 강상욱, 손호진*
고려대학교 신소재화학과, Korea
Abstract Development of blue phosphorescent emitter is one of the key challenges in the field of organic light-emitting diodes (OLEDs). In this study, we report on the synthesis and photopysical characterization of heteroleptic cyclometalated sulfonyl-substitued Iridium(III) complexes with ancillary ligands, such as the Ir(C^N)2(ancillary ligand), (C^N = 3-(pyridin-2-yl)benzene-1-sulfonyl fluoride (SO2F), 2-(3-(trifluoromethylsulfonyl)phenyl)pyridine (SO2CF3); ancillary ligand = acetylacetone (acac), borate (bor) and picolinate (pic)). A systematic blue-shift on the emission spectra is observed on the variation of ancillary ligand from acac (λmax = 490 nm) to bor (λmax = 460 nm). Density-functional theory (DFT) calculations on the HOMOs and LUMOs for this series show a trend similar to those observed from photophysical and electrochemical analyses. The sulfonyl-substituted Iridium complexes having bor moiety as ancillary group (Ir(SO2F)2(bor) and Ir(SO2CF3)2(bor)) were shown to be a potential blue-emitting material, exhibiting a maximum efficiency of 2850 cd/m2 at 7.8 V with 8.1 cd/A in a multilayered device structure of ITO/PEDOT:PSS/PVK:OXD-7(35%):Ir Complex(15%)/TPBi/LiF/Al.
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