Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (1): 17-22.doi: 10.3866/PKU.WHXB201411212


Crystal Structure and Photophysical Properties of an Iridium(Ⅲ) Pyrazine Complex

WEI Chuan-Dong1, GE Guo-Ping1, LI Chun-Yan1, LEI Ke-Wei1, LIANG Hong-Ze1, YU Gang2, LIU Zhi-Wei2   

  1. 1. State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang Province, P. R. China;
    2. State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2014-10-23 Revised:2014-11-21 Published:2014-12-25
  • Contact: GE Guo-Ping, LIU Zhi-Wei;
  • Supported by:

    The project was supported by the Ningbo Municipal Natural Science Foundation, China (2010A610164,2010A610187), Ningbo Social Development Project, China (2012C5002), and K. C. Wong Magna Fund of Ningbo University, China.


An iridium(Ⅲ) complex of (MDPPF)2Ir(acac) (MDPPF=4,4'-difluoro-5-methyl-2,3-diphenylpyrazine, acac=acetylacetone) has been prepared and characterized by X-ray single crystal diffraction. The photophysical properties of (MDPPF)2Ir(acac) were investigated using UV-Vis spectroscopy and photoluminescence (PL) techniques. X-ray diffraction (XRD) studies revealed that the complex belongs to a triclinic systemof the P1 space group with cell dimensions a=1.13984(3) nm, b=1.26718(3) nm, c=1.29541(3) nm, α=93.7181(19)°, β= 101.638(2)°, γ=110.853(3)° and V=1.69336(7) nm3.Asolution of the (MDPPF)2Ir(acac) complex in dichloromethane was found to emit yellowlight with amaximumpeak at 555 nmat roomtemperature. Furthermore, (MDPPF)2Ir(acac) was used as a phosphorescence dopant in organic light-emitting diodes (OLEDs) with the structures of ITO/NPB (40 nm)/CBP:(MDPPF)2Ir(acac) (20 nm)/TPBi (10 nm)/Alq3 (30 nm)/LiF (1 nm)/Al (100 nm). These devices showed yellowemission at 558 nm, a maximumbrightness of 32700 cd·m-2, current efficiency of 44.7 cd·A-1 and power efficiency of 20.7 lm·W-1.

Key words: Iridium(Ⅲ) complex, Pyrazine, Phosphorescent material, Organic light-emitting diode


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