Citation: Chen Shiqi, Dai Jun, Zhou Kaifeng, Luo Yanju, Su Shijian, Pu Xuemei, Huang Yan, Lu Zhiyun. Synthesis and Characterization of New Solution-Processable Red Iridium (Ⅲ) Complexes Based on a Phenylation Strategy[J]. Acta Chimica Sinica, ;2017, 75(4): 367-374. doi: 10.6023/A17010015 shu

Synthesis and Characterization of New Solution-Processable Red Iridium (Ⅲ) Complexes Based on a Phenylation Strategy

Chen Shiqi ^a,† ,
Dai Jun ^a,† ,
Zhou Kaifeng ^b,† ,
Luo Yanju ^a ,
Su Shijian ^b,*,, ,
Pu Xuemei ^a ,
Huang Yan ^a ,
Lu Zhiyun ^a,*,,

a.
College of Chemistry, Sichuan University, Chengdu 610064
b.
Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640

Corresponding author: Su Shijian, mssjsu@scut.edu.cn Lu Zhiyun, luzhiyun@scu.edu.cn
Received Date: 10 January 2017

Fund Project: the National Natural Science Foundation of China 21372168

Figures(10)

The exploitation of high-performance solution-processable phosphorescence organic light-emitting diode (PhOLED) materials is of great significance for the realization of large-area, low-cost and flexible display. On the basis of our previous findings that the para-phenylation (phenyl or 4-methoxyphenyl, with respect to the C-Ir bond) on the cyclometalated ligand (C.N ligand) of bis[2-phenylbenzothiazolato-N, C²']iridium (Ⅲ)(acetylacetonate) can result in compounds with drastically enhanced film amorphism hence much improved electroluminescence (EL) performance, herein, this para-phenylation strategy was applied to Ir (Ⅲ) complexes bearing a molecular platform of orange-emissive bis[2-(6-diphenylamino) phenylbenzothiazolato-N, C²']iridium (Ⅲ)(acetylacetonate)[(Nbt)₂Ir (acac)] to afford two new Ir (Ⅲ) complexes, namely (3PhNbt)₂Ir (acac) and (3OMePhNbt)₂Ir (acac). X-ray diffraction (XRD) characterization results revealed that both the two objective compounds possess much enhanced film amorphism than their parent compound (Nbt)₂Ir (acac), validating the efficacy of this para-phenylation strategy in achieving Ir (Ⅲ) complexes with enhanced film amorphism. Addi-tionally, in comparison with (Nbt)₂Ir (acac), both (3PhNbt)₂Ir (acac) and (3OMePhNbt)₂Ir (acac) show much enhanced solubility in common organic solvents, together with 5~10 nm bathochromic-shifted phosphorescence band to red region. As a consequence, (3PhNbt)₂Ir (acac) and (3OMePhNbt)₂Ir (acac) were expected to be promising guest materials for the fabrication of high-performance solution-processed red PhOLEDs. EL characterization results indicated that for single-layer red solu-tion-processed PhOLEDs using (3PhNbt)₂Ir (acac) and (3OMePhNbt)₂Ir (acac) as the guest dopant, they show peak current efficiency of 2.4 cd·A^-1 and 8.7 cd·A^-1, maximum brightness of 1830 cd·m^-2 and 6630 cd·m^-2, and CIE coordinates of (0.61, 0.39) and (0.62, 0.38), respectively. In contrast, the contral device based on the orange-emissive (Nbt)₂Ir (acac) only shows a peak current efficiency of 1.5 cd·A^-1, maximum brightness of 1620 cd·m^-2, and CIE coordinates of (0.59, 0.41). These results confirmed that para-phenyl modification on the C.N ligand (with respect to the C-Ir bond) is indeed an effective approach to acquiring high-performance solution-processable PhOLED Ir (Ⅲ) complexes with simultaneously red-shifted emission band.
- electroluminescence,
- red iridium (Ⅲ) complex,
- solution-processable,
- phenylation,
- amorphism
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