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

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, th...

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Bibliographic Details
Published in:Journal of innovative optical health science 2020-09, Vol.13 (5), p.2041003-1-2041003-9
Main Authors: Zhu, Yaowei, Miao, Yawei, Xue, Tingting, Liu, Youchang, Zheng, Chunying, Ma, Jiping, Tan, Weiqiang, Wen, Shuguang, Gu, Chuantao
Format: Article
Language:English
Subjects:
Absorption
Carbazole
Carbazoles
conjugated polymers
Fluorene
Fluorescence
Hybridization
Near infrared radiation
p-azaquinodimethane
Polymers
Quinones
Red shift
Research Article
Short wave radiation
short-wave infrared region
Signal to noise ratio
Tissues
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Summary: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.
ISSN:1793-5458
1793-7205
DOI:10.1142/S1793545820410035