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Preparation and electroluminescent application of iridium(III) complexes containing sulfur-containing phenylpyridazine ligands

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Abstract

Four iridium(III) complexes (1–4) with sulfur-containing phenylpyridazine ligands were successfully synthesized and characterized. The structure of complex 3 was further confirmed by single X-ray structural analysis. These complexes showed strong green phosphorescence at room temperature with peak wavelengths ranging from 524 to 539 nm in CH2Cl2 solution. These complexes exhibited medium quantum yields of 42 ~ 61% in PMMA films with lifetimes of 1.58 ~ 3.26 μs. These complexes also exhibited good thermal stability with Td > 275 °C. The phosphorescent OLEDs were fabricated using complexes 1 and 2 as dopants. The device using complex 2 displayed good performances with the maximum luminance, current efficiency, power efficiency and external quantum efficiency of 8913 cd m−2, 44.2 cd A−1, 30.7 lm W−1 and 11.8%, respectively. These results indicate excellent application prospects of these iridium(III) complexes as efficient phosphors in OLEDs.

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Acknowledgements

The authors acknowledge financial support from the National Natural Science Foundation of China (21572001, 61675088, 61675089), Project of Science and Technology Development Plan of Jilin Province (20190302011GX, 20190701023GH) and the National Undergraduate Innovation and Entrepreneurship Training Program (202010360003).

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  1. Wei Cheng, Ren Sheng and Yan Wang have contributed equally to this work

Authors and Affiliations

  1. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling, Ministry of Education, Institute of Molecular Engineering and Applied Chemistry, School of Metallurgy Engineering, Anhui University of Technology, Maanshan, 243002, Anhui, China

    Wei Cheng, Yan Wang, Yuting Liu & Bihai Tong

  2. State Key Laboratory On Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, P. R. China

    Ren Sheng & Ping Chen

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

    Song Wang

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  1. Wei Cheng
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  2. Ren Sheng
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  3. Yan Wang
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  4. Yuting Liu
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  5. Bihai Tong
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Correspondence to Bihai Tong, Ping Chen or Song Wang.

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Cheng, W., Sheng, R., Wang, Y. et al. Preparation and electroluminescent application of iridium(III) complexes containing sulfur-containing phenylpyridazine ligands. Transit Met Chem 46, 81–89 (2021). https://doi.org/10.1007/s11243-020-00424-6

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  • DOI: https://doi.org/10.1007/s11243-020-00424-6

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