Synthesis and Characterization of a Green-Emitting Iridium Complex Based on Fluorinated Benzoimidazole Ligand

doi:10.3724/SP.J.1095.2014.40050

Chinese Journal of Applied Chemistry

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Synthesis and Characterization of a Green-Emitting Iridium Complex Based on Fluorinated Benzoimidazole Ligand

LV Jianhong^1,2, MA Zhihua¹, DING Junqiao^1*, WANG Lixiang^1*

(1.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of
Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;
2.University of Chinese Academy of Sciences,Beijing 100049,China)

Received:2014-02-24 Revised:2014-04-03 Published:2014-09-04 Online:2014-09-04
Contact: Junqiao Ding

Abstract

Abstract: On the basis of a fluorinated ligand, namely 2-(4′-fluorophenyl)-1-phenyl-benzoimidazole, a green-emitting iridium complex mer-Ir(FPBI)3 with meridional configuration has been successfully synthesized under a temperature higher than 200 ℃, which is confirmed by both 1H NMR and single crystal X-ray diffraction analysis. Different from previously-reported meridional iridium complexes(＜0.1), noticeably, mer-Ir(FPBI)3 shows a photoluminescent quantum yield as high as 0.46. Therefore, highly efficient phosphorescent organic light-emitting diodes(PhOLEDs) are realized by tuning the doping concentration of mer-Ir(FPBI)3 into 4,4′-N,N′-dicarbazolebiphenyl(CBP), revealing a maximum current efficiency of 38.5 cd/A(11.8%) with the corresponding Commission Internationale de L′Eclairage(CIE) coordinates of (0.29, 0.58).

Key words: meridional configuration, iridium complex, photoluminescent quantum yield, phosphorescent organic light-emitting diodes

CLC Number:

O641.1

LV Jianhong1,2, MA Zhihua1, DING Junqiao1*, WANG Lixiang1*. Synthesis and Characterization of a Green-Emitting Iridium Complex Based on Fluorinated Benzoimidazole Ligand[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.40050.

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Synthesis and Characterization of a Green-Emitting Iridium Complex Based on Fluorinated Benzoimidazole Ligand

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