Citation: PAN Miao, LI Si-Hua, CHENG Mao-Ling, HU Yuan-Yuan, SHI Peng, XU Jing-Yu, TONG Bi-Hai, FUNG Man-Keung, ZHANG Qian-Feng. Effect of Ancillary Ligand on Photoelectric Properties of Cinnoline Iridium Complexes[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(4): 627-632. doi: 10.11862/CJIC.2018.081 shu

Effect of Ancillary Ligand on Photoelectric Properties of Cinnoline Iridium Complexes

1.
Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Institute of Molecular Engineering and Applied Chemistry, School of Metallurgy Engineering, Anhui University of Technology, Ma'anshan, Anhui 243002, China
2.
Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials(FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, China

Corresponding author: TONG Bi-Hai, tongbihai@163.com FUNG Man-Keung, mufung@suda.edu.cn ZHANG Qian-Feng, zhangqf@ahut.edu.cn
Received Date: 31 October 2017
Revised Date: 19 December 2017

Figures(6)

Two new cyclometalated iridium(Ⅲ) complex (dpci)₂Ir(paz) and (dpci)₂Ir(taz) (dpci=3, 4-diphenylcinnoline, pazH=5-(2-pyridyl)-3-trifuoromethylpyrazole, tazH=5-trifuoromethyl-3-(pyridin-2-yl)-1H-1, 2, 4-triazole), were succ-essfully synthesized and characterized by NMR spectroscopy and high resolution mass spectrometry. The photo-luminescence spectra of (dpci)₂Ir(paz) and (dpci)₂Ir(taz) in PMMA (1%, w/w) show emission maximum at 616 and 612 nm, which are blue shifted compared to that of reference complex (dpci)₂Ir(pic) (pic=picolinate, 625 nm). The quantum yields of (dpci)₂Ir(paz) and (dpci)₂Ir(taz) are 51.9% and 32.5%, which are higher than that of (dpci)₂Ir(pic) (16.1%). After modification, the thermal stability of complexes are enhanced, and they can be used to prepare organic electroluminescent devices by evaporation method. OLED device using (dpci)₂Ir(paz) as dopant exhibited intense saturated red emission with CIE coordinates of (0.66, 0.34). The device has the best performance with a maximum external quantum efficiency of 2.7% and luminance efficiency of 8.5 cd·A^-1. The maximum luminance was 2 484 cd·m^-2. The device based on I(dpci)₂Ir(taz) exhibits the best efficiency. Its maximum external quantum efficiency is 5.5% and the corresponding efficiency is 14.5 cd·A^-1. The maximum luminance is 2 931 cd·m^-2.
- cyclometalated iridium(Ⅲ) complex,
- phenylcinnoline,
- organic electroluminescence,
- phosphorescence,
- ancillary ligand
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1.
沈阳化工大学材料科学与工程学院沈阳 110142