Citation: CHEN Man, XIAO Yu-Ping, WANG Yue, ZHOU Yue-Yue, WANG Ping, TONG Bi-Hai, YE Shang-Hui, WANG Song. Low Concentration Quenched Electroluminescent Devices Based on Bipolar Rhenium Complexes[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(4): 651-658. doi: 10.11862/CJIC.2020.071 shu

Low Concentration Quenched Electroluminescent Devices Based on Bipolar Rhenium Complexes

CHEN Man ¹ ,
XIAO Yu-Ping ² ,
WANG Yue ¹ ,
ZHOU Yue-Yue ¹ ,
WANG Ping ¹ ,
TONG Bi-Hai ^1,, ,
YE Shang-Hui ^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.
Key Laboratory for Organic Electronics and Information Display, Advanced Biological and Chemical Manufacturing Collaborative Innovation Center, Nanjing University of Posts and Telecommunications, Nanjing 210023, 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 YE Shang-Hui, iamshye@njupt.edu.cn WANG Song, wangsong1984@126.com
Received Date: 18 August 2019
Revised Date: 19 January 2020

Figures(7)

A novel tricarbonyl complex Re(CO)3₃(ECAF)Cl containing the bipolar (9, 9-bis(9-ethylcarbazol-3-yl)-4, 5-diazafluorene (ECAF) ligand was synthesized and characterized by NMR spectroscopy and high resolution mass spectrometry. In order to study the thermal stability and photoelectric properties of complex Re(CO)3₃(ECAF)Cl, the reference complex Re(CO)3₃(SB)Cl containing 4, 5-diazo-9, 9-spirodifluorene (SB) ligand was also synthesized. Compared with the decomposition temperature of reference (366℃), complex Re(CO)3₃(ECAF)Cl (419℃) exhibited better thermal stability. As a result of the increase of the optical energy gap caused by the electron-rich carbazole group, compared with the luminescence wavelength of reference complex (572 nm), the wavelength of Re(CO)3₃(ECAF)Cl blue-shifted to 565 nm. The luminescent quantum efficiency (39%) of Re(CO)3₃(ECAF)Cl was slightly higher than that of the reference material (37%). The spin-coating electroluminescent devices were fabricated, and the optimized doping concentration of Re(CO)3₃(ECAF)Cl-based device was as high as 30%, which was 2.4 times that of the reference complex-based device. The quite low turn-on voltage (2.9 V) of Re(CO)3₃(ECAF)Cl-based device was significantly less than that of reference complex-based device (4.0 V), reflecting that ECAF can depress luminescent quenching and improve the charge transporting performance of complexes significantly. The maximum current efficiency and maximum external quantum efficiency of Re(CO)3₃(ECAF)Cl-based devices were 8.2 cd·A^-1 and 3.0%, respectively, which were lower than the efficiencies (9.7 cd·A^-1 and 3.9%) of reference complex-based device. These results show that bipolar ECAF ligand is an excellent ligand for luminescent rhenium complexes.
- tricarbonyl rhenium(Ⅰ) complex,
- carbazole,
- diazafluorene,
- luminescent quenching,
- bipolar ligand,
- organic light-emitting diode
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