Journal of Innovative Optical Health Sciences, Volume. 13, Issue 5, 2041003(2020)

The short wave near-infrared fluorescence properties of two p-azaquinodimethane (p-AQM)-based conjugated polymers

Yaowei Zhu1, Yawei Miao1, Tingting Xue2, Youchang Liu3, Chunying Zheng1, Jiping Ma1, Weiqiang Tan1, Shuguang Wen4, and Chuantao Gu1,4、*
Author Affiliations
  • 1School of Environmental and Municipal Engineering Qingdao University of Technology Qingdao 266580, P. R. China
  • 2China United Test & Evaluation (Qingdao) Co., Ltd. Qingdao 266011, P. R. China
  • 3Qingdao Institute of Textile Fibre Supervision and Inspection, Qingdao 266061, P. R. China
  • 4CAS Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101, P. R. China
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    The absorption, scattering, and autofluorescence of biological tissues in short-wave infrared region (SWIR, 900–1700 nm) are relatively low, so SWIR fluorescence usually has deeper penetration into living tissues, and can show a higher signal-to-noise ratio when used for imaging in vivo. However, there are few types of organic SWIR fluorescent materials currently. In this work, p-azaquinodimethane (p-AQM) with a quinoid structure is used as the acceptor unit, and carbazole or fluorene with sp3 hybridization are used as the donor units, two conjugated polymers were synthesized. The quinone structure is conducive to the redshift of absorption and fluorescence spectra, and the sp3 hybridization structure is conducive to weakening the aggregation quenching of polymer fluorescence. PF and PCz exhibited absorption peaks of 492 nm and 508 nm, respectively. The emission peaks of the two polymers are 920 nm and 950 nm, respectively, both in the short-wave near infrared region. The quantum yield (QY) of PF and PCz is 0.4% and 0.3%, respectively.

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    Yaowei Zhu, Yawei Miao, Tingting Xue, Youchang Liu, Chunying Zheng, Jiping Ma, Weiqiang Tan, Shuguang Wen, Chuantao Gu. The short wave near-infrared fluorescence properties of two p-azaquinodimethane (p-AQM)-based conjugated polymers[J]. Journal of Innovative Optical Health Sciences, 2020, 13(5): 2041003

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    Paper Information

    Received: Jun. 25, 2020

    Accepted: Jul. 13, 2020

    Published Online: Oct. 29, 2020

    The Author Email: Gu Chuantao (guchuantao@163.com)

    DOI:10.1142/s1793545820410035

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