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Synthesis of Thieno[3,4-b]pyrazine-based Alternating Conjugated Polymers via Direct Arylation for Near-infrared OLED Applications

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Abstract

Three alternating conjugated polymers, namely PFTP, PCzTP, and PSiTP, which combine a thieno[3,4-b]pyrazine (TP) unit with different benzene-based donor units such as 9,9-dioctylfluorene, 9-heptadecyl-9H-carbazole and 5,5-dioctyl-5H-dibenzo[b,d]silole, were synthesized in good yield (>85%) and high molecular weight up to Mn=5.82×104via direct arylation polymerization (DArP). All the resultant polymers exhibit moderate bandgap of about 1.80 eV and strong deep red/near-infrared emitting in the solid state. Among them, the PSiTP-based electroluminescence (EL) devices with an architecture of ITO/PEDOT:PSS/PTAA/emitting layer/TPBi/LiF/Al give the best performance with a maximum luminance of 2543 cd/m2 at 478 mA/cm2. This work expands the application scope of high-performance conjugated polymers which can be synthesized by DArP.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 21604063 and 52173010), and the Program for Prominent Young College Teachers of Tianjin Educational Committee.

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Authors and Affiliations

  1. School of Materials Science & Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Key Laboratory of Display Materials & Photoelectric Devices, Ministry of Education, Tianjin University of Technology, Tianjin, 300384, China

    Ze-Wang He, Qiang Zhang, Hong-Ting Han & Yan Lu

  2. College of Chemistry, Nankai University, Tianjin, 300071, China

    Chen-Xi Li

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  1. Ze-Wang He
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  2. Qiang Zhang
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  3. Chen-Xi Li
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  4. Hong-Ting Han
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Correspondence to Yan Lu.

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Synthesis of Thieno[3,4-b]pyrazine-based Alternating Conjugated Polymers via Direct Arylation for Near-infrared OLED Applications

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He, ZW., Zhang, Q., Li, CX. et al. Synthesis of Thieno[3,4-b]pyrazine-based Alternating Conjugated Polymers via Direct Arylation for Near-infrared OLED Applications. Chin J Polym Sci 40, 138–146 (2022). https://doi.org/10.1007/s10118-022-2661-0

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