Citation: REN Jing-Kun, XU Hui-Xia, QU Li-Tao, Zhang Ye, HAO Yu-Ying, WANG Hua, XU Bing-She. Synthesis and Optoelectronic Properties of a Red-Emitting Iridium(III) Complex Containing 1-Phenylpyrazole[J]. Acta Physico-Chimica Sinica, ;2013, 29(05): 1115-1122. doi: 10.3866/PKU.WHXB201302253 shu

Synthesis and Optoelectronic Properties of a Red-Emitting Iridium(III) Complex Containing 1-Phenylpyrazole

REN Jing-Kun ¹ ,
XU Hui-Xia ^2,3, ,
QU Li-Tao ¹ ,
Zhang Ye ¹ ,
HAO Yu-Ying ^1,2, ,
WANG Hua ^2,3 ,
XU Bing-She ^2,3

1.
1 Department of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, P.R. China;
2 Research center of Advanced Material science and Technology Taiyuan University of Technology, Taiyuan, 030024, P.R. China;
3 Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan, 030024, P.R. China

Received Date: 5 December 2012
Available Online: 25 February 2013
Fund Project: 教育部长江学者与创新团队发展项目(IRT0972) (IRT0972) 国家国际科技合作(2012DFR50460) (2012DFR50460) 国家自然科学基金(21071108, 60976018, 21101111,61274056, 61205179) (21071108, 60976018, 21101111,61274056, 61205179) 山西省自然科学基金(2010021023-2, 2011021022-2) (2010021023-2, 2011021022-2)山西省科技攻关项目(20120321019)资助 (20120321019)

The synthesis, characterization, photophysical and electrophosphorescent properties of iridium(III) complex [(ppz)₂Ir(piq)] (ppz=1-phenylpyrazole, piq=1-phenylisoquinoline) are reported. The structure was defined by proton nuclear magnetic resonance (¹H NMR). The photophysical properties and energy-level structure of [(ppz)₂Ir(piq)] are studied by ultraviolet-visble (UV-Vis) absorption, fluorescence, and phosphorescent spectroscopies at 77 K, cyclic voltammetry (CV), and time-dependent density functional theory (TD-DFT) calculation. The electroluminescent properties of [(ppz)₂Ir(piq)] using 4,4'-bis(9-carbazolyl)-1, 1'-biphenyl (CBP) as a host are investigated. Absorption bands of [(ppz)₂Ir(piq)] are located at about 296, 342, 395, and 442 nm. [(ppz)₂Ir(piq)] exhibits red phosphorescent emission with a peak at 618 nm in CH₂Cl₂ solution at room temperature and 598 nm in 2-methyltetrahydrofuran (2-MeTHF) at 77 K, from which its triplet state energy (E_T) is estimated to be 2.07 eV. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) levels of [(ppz)₂Ir(piq)] are -5.92 and -3.62 eV, respectively. A theoretical calculation reveals that the HOMO of [(ppz)₂Ir(piq)] is mainly distributed on ppz and the iridium ion, while the LUMO is mainly centered on piq. Organic light-emitting diodes (OLEDs) containing [(ppz)₂ Ir(piq)]- doped CBP emitting layer exhibit an electroluminescence (EL) maximum at 616 nm, an optimized doping concentration of 8%-12% (w), maximum current efficiency of about 10 cd·A^-1, maximum power efficiency of 4.44 lm·W^-1, and International Commission on Illumination (CIE) coordinates of (0.65, 0.35). This investigation provides an important experimental basis for the application of [(ppz)₂Ir(piq)] in organic electroluminescent devices.
- Red phosphorescence material,
- 1-phenylphrazole,
- 1-phenylisoquinoline,
- Optoelectronic characteristic,
- Doping concentration
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