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Citation: YU Xiao-Hang, GE Guo-Ping, ZHANG Guo-Lin, GUO Hai-Qing. Synthesis and Photoluminescence of Iridium(III) Diazine Complex Modified with a Carbazyl Group[J]. Acta Physico-Chimica Sinica, ;2010, 26(04): 1184-1190. doi: 10.3866/PKU.WHXB20100442 shu

Synthesis and Photoluminescence of Iridium(III) Diazine Complex Modified with a Carbazyl Group

1.
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; College of Chemistry, Liaoning University, Shenyang 110036, P. R. China; State Key Laboratory Base of Novel Functional Materials and Preparation Science, the Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang Province, P. R. China

Received Date: 13 December 2009
Available Online: 12 March 2010

We designed and synthesized a new pyrazine derivative containing the carbazyl moiety, 2,3-di(4-(9-carbazylmethyl)phenyl)-5-methylpyrazine(CzMPMP) and investigated its reaction with iridium(III) ion to form the iridium complex Ir(CzMPMP)2(acac) (acac: acetyl acetone). The complex was characterized by nuclear magnetic resonance (NMR) spectroscopy, mass spectrometry (MS) and elemental analysis (EA) and its photophysical properties were investigated by UV-Vis spectroscopy as well as solution and solid state photoluminescence (PL) techniques. By comparing Ir(CzMPMP)2(acac) with Ir(DPMP)2(acac) (DPMP: 2,3-diphenyl-5-methylpyrazine), we find that the carbazyl group greatly influences the photophysical properties of the complexes. Firstly, Ir(DPMP)2(acac) has a strong and broad excimer peak in its solid state PL spectrum, while Ir(CzMPMP)2(acac) has no such peak under the same conditions. Furthermore, the PL intensity of Ir(CzMPMP)2(acac) in solution increased significantly compared with Ir(DPMP)2(acac). These results suggest that steric hindrance from the carbazyl groups may play an important role in preventing excimer formation and thus resulting in the increased PL intensity.
- Carbazole,
- Pyrazine,
- Iridium(III) complex,
- Organic light-emitting device,
- Phosphorescence
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