Citation: Ren Bao-Yi, Yi Jian-Cheng, Zhong Dao-Kun, Zhao Yu-Zhi, Guo Run-Da, Sheng Yong-Gang, Sun Ya-Guang, Xie Ling-Hai, Huang Wei. Conjugated Regulation of Phosphorescent Iridium (Ⅲ) Complex Constructed from Spiro Ligand and Its Electroluminescent Performances[J]. Acta Chimica Sinica, ;2020, 78(1): 56-62. doi: 10.6023/A19110406 shu

Conjugated Regulation of Phosphorescent Iridium (Ⅲ) Complex Constructed from Spiro Ligand and Its Electroluminescent Performances

a.
Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142
b.
Key Laboratory for Organic Electronics and Information Displays, Institute of Advanced Materials(IAM), Nanjing University of Posts & Telecommunications, Nanjing 210023
c.
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074

Corresponding author: Guo Run-Da, runda_guo@hust.edu.cn Sun Ya-Guang, sunyaguang@syuct.edu.cn
Received Date: 15 November 2019
Available Online: 19 January 2019
Fund Project: the Supporting Project for Innovative Talents of Higher Education Institutions in Liaoning Province LR2018018Project supported by the Supporting Project for Innovative Talents of Higher Education Institutions in Liaoning Province (LR2018018), the Natural Science Foundation of Liaoning Province (No. 20180550539), the Science and Technology project of Shenyang (No. 18-013-0-26), and the Open Research Fund of Key Laboratory for Organic Electronics and Information Displaysthe Natural Science Foundation of Liaoning Province 20180550539the Science and Technology project of Shenyang 18-013-0-26

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It is an important pathway in the field of phosphorescent organic light-emitting diodes (PhOLED) that endowing iridium (Ⅲ) emitters with the features of low-cost, decent photoelectric properties, and high doping-concentration application by harmonizing electronic and steric effects of corresponding ligands. Based on our previous research that introducing spiro ligand into Ir^Ⅲ complexes to protect emitting-center and to suppress concentration quenching, herein, for pushing the emission to orange region, we extend the conjugated structure of spiro[fluorene-9, 9'-xanthene] (SFX) by connected benzo[d]-thiazole-2-yl on the fluorene moiety of SFX via Suzuki-Miyaura coupling, acting as a new spiro ligand. A homoleptic Ir^Ⅲ complex, fac-Ir(SFXbtz)₃, was synthesized successfully, and the structure and the photophysical and electrochemical properties were studied by nuclear magnetic resonance, single crystal X-ray diffraction, absorption and emission measurements, as well as cyclic voltammetry. The crystallographic data revealed an enlarged Ir…Ir distance and weakly intermolecular π-π interactions between the spiro ligands. The emission spectrum of fac-Ir(SFXbtz)₃ showed a maximum peak at 587 nm and a shoulder peak at 635 nm with a photoluminescence (PL) quantum yield (QY) of 64.7% (relative to tris[2-phenylpyridinato-C², N]iridium(Ⅲ), PLQY=40%). The highest occupied molecular orbital level was determined to be -5.28 eV according to the onset oxidation potential (0.48 V). In view of the orange light-emitting and the high PLQY of fac-Ir(SFXbtz)₃, the monochromatic and two-element white PhOLED were fabricated to investigate its electroluminescence (EL) performance in high doping concentrations, ω=12% for monochromatic device and ω=15% for two-element white device, respectively. The EL spectrum of the monochromatic PhOLED (device D1) using common 4, 4'-bis(N-carbazolyl)-1, 1'-biphenyl as host exhibits two emission peaks, a maximum emission peak at 581 nm and shoulder emission peak at 631 nm, corresponding to its PL spectrum. The device D1 shows a peak performance of 10.8 cd·A^-1 and 8.4 lm·W^-1, maximum brightness of 7217 cd·m^-2, respectively. The two-element white PhOLED selecting bis[2-(4, 6-difluorophenyl)pyridinato-C², N](picolinato)iridium(Ⅲ) as complementary blue-light component, possesses a peak performance of 11.6 cd·A^-1 and 8.0 lm·W^-1, maximum brightness of 8763 cd·m^-2, and stabilized CIE 1931 (0.34~0.37, 0.36~0.38) under operated voltages of 3~9 V, respectively. These results indicate that the fac-Ir(SFXbtz)₃ is a potential phosphor for efficient orange PhOLED, possessing the advantages of low-cost, suitable doping in high concentration, and stabilized color coordinates.
- spiro[fluorene-9, 9'-xanthene],
- cyclometalated iridium (Ⅲ) complex,
- conjugated structure,
- electroluminescence
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