Citation: CHEN Man, WANG Yue, ZHOU Yue-Yue, WANG Ping, TONG Bi-Hai, FUNG Man-Keung, WANG Song. Influence of Spirofluorene on Photoelectric Properties of Iridium Complexes Containing Tridentate Phosphite Ligands[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(3): 494-502. doi: 10.11862/CJIC.2020.045 shu

Influence of Spirofluorene on Photoelectric Properties of Iridium Complexes Containing Tridentate Phosphite Ligands

CHEN Man ¹ ,
WANG Yue ¹ ,
ZHOU Yue-Yue ¹ ,
WANG Ping ¹ ,
TONG Bi-Hai ^1,, ,
FUNG Man-Keung ^2,, ,
WANG Song ^3,,

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, Maanshan, 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
3.
Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang, Hubei 441053, China

Corresponding author: TONG Bi-Hai, tongbihai@163.com FUNG Man-Keung, mkfung@suda.edu.cn WANG Song, wangsong1984@126.com
Received Date: 30 May 2019
Revised Date: 3 December 2019

Figures(7)

A cyclometalated iridium(Ⅲ) complex Ir(tpit)(sb)Cl (tpitH₂=triphenyl phosphite) containing 4, 5-diazo-9, 9-spirobifluorene (sb) ligand was successfully synthesized and characterized by NMR spectroscopy and high resolution mass spectrometry. X-ray single crystal diffraction analysis showed that the existence of sb ligand distorted the structure of complex, which is beneficial for reducing the molecular aggregation and luminescent quenching. The photoelectric properties of complex Ir(tpit)(sb)Cl has been studied in comparison with those of the model complex Ir(tpit)(bpy)Cl (bpy=2, 2'-bipyridine) existing intramolecular π-π stacking. The results show that the luminescence wavelength of complex Ir(tpit)(sb)Cl in polymethyl methacrylate (mass fraction 1%) was 512 nm, and had a blue shift of 8 nm compared to that of complex Ir(tpit)(bpy)Cl (520 nm). The quantum efficiency of the complex Ir(tpit)(sb)Cl was 30%, which is significantly lower than that of the complex Ir(tpit)(bpy)Cl (94%), indicating the radiative transition rate is reduced by spirofluorene. Based on the complex Ir(tpit)(sb)Cl, the maximum current efficiency and external quantum efficiency of OLED device are 14 cd·A^-1 and 4.5%, respectively. The maximum current efficiency and external quantum efficiency of Ir(tpit)(bpy)Cl-based device are up to 60 cd·A^-1 and 18.2%, respectively.
- cyclometalated iridium(Ⅲ) complex,
- tridentate phosphite ligand,
- organic electroluminescence,
- phosphorescence,
- spirofluorene
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