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

doi:10.6023/A17010015

Acta Chim. Sinica ›› 2017, Vol. 75 ›› Issue (4): 367-374.DOI: 10.6023/A17010015 Previous Articles Next Articles

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基于苯基修饰策略的新型可溶液加工红光铱配合物的设计、合成及电致发光性能研究

陈仕琦^a, 代军^a, 周凯峰^b, 罗艳菊^a, 苏仕健^b, 蒲雪梅^a, 黄艳^a, 卢志云^a

a 四川大学化学学院成都 610064;
b 华南理工大学发光材料与器件国家重点实验室广州 510640

投稿日期:2017-01-10 发布日期:2017-03-07
通讯作者: 苏仕健,E-mail:mssjsu@scut.edu.cn;Fax:020-87110606;卢志云,E-mail:luzhiyun@scu.edu.cn;Fax:028-85410059; E-mail:mssjsu@scut.edu.cn;luzhiyun@scu.edu.cn
基金资助:
项目受国家自然科学基金（No.21372168）资助.

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

Received:2017-01-10 Published:2017-03-07
Contact: 10.6023/A17010015 E-mail:mssjsu@scut.edu.cn;luzhiyun@scu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (No. 21372168).

1. Synthesis and Characterization of New Solution-Processable Red Iridium (III) Complexes Based on a Phenylation Strategy.PDF(1574KB)

Abstract

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.

Key words: electroluminescence, red iridium(III) complex, solution-processable, phenylation, amorphism

Cite this article

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 Chim. Sinica, 2017, 75(4): 367-374.

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基于苯基修饰策略的新型可溶液加工红光铱配合物的设计、合成及电致发光性能研究

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

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