CRCU

Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (4): 686-689.doi: 10.1007/s40242-013-3005-y

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Synthesis and Luminescent Properties of Iridium Complexes with Reduced Concentration Quenching Effect

ZHANG Li-ying1, LI Bin2, WANG Jian-xing1   

  1. 1. College of Science, Henan University of Technology, Zhengzhou 450001, P. R. China;
    2. Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
  • Received:2013-01-06 Revised:2013-03-18 Online:2013-08-01 Published:2013-07-15
  • Contact: ZHANG Li-ying E-mail:zhangly1103@yahoo.com.cn
  • Supported by:

    Supported by the Basic Research Foundation of Henan University of Technology, China(No.11JCYJ17) and the Science Foundation of Henan University of Technology, China(No.2009BS036).

Abstract:

Three novel cyclometalated ligands 1-benzyl-2-phenyl-1H-benzoimidazole(BPBM), 1-(4-methoxy-benzyl)-2-(4-methoxy-phenyl)-1H-benzoimidazole(MBMPB) and 4-[2-(4-dimethylamino-phenyl)-benzoinidazol-1-ylmethyl]-phenyl-dimethyl-amine(DBPA) were designed and synthesized, and the corresponding highly efficiency green-emitting phosphorescent iridium complexes Ir(BPBM)2(acac)(1), Ir(MBMPB)2(acac)(2) and Ir(DPBA)2(acac) (3) with acetylacetone(acac) as auxiliary ligand were also synthesized. The ligands are functionalized by bulky non-planarity substituents, thus the phosphorescent concentration quenching is substantially suppressed, and all the complexes exhibit bright photoluminescence(PL) in solid state. The photo-physical properties of the three iridium complexes were researched in detail. The results indicate that they have potential application in fabricating non-doped electrophosphorescence device.

Key words: Green-emitting, Iridium complex, Bulky non-planarity substituent