|
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. |
E-mail |
jjoni89@naver.com |
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