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

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

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 E-mail:geguoping@nbu.edu.cn;zwliu@pku.edu.cn
  • 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.

Abstract:

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

MSC2000: 

  • O641