摘要
The absorption,scattering,and autofluorescence of biological tissues in short-wave infrared re-gion(SWIR,900-1700 nm)are relatively low,so SWIR fluorescence usually has deeper pene-tration 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 car-bazole 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 fluores-cence 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,respec-tively,both in the short-wave near infrared region.The quantum yield(QY)of PF and PCz is 0.4%and 0.3%,respectively.
基金
supported by the National Natural Science Foundation of China(Grant Nos.21807062 and 21976099)
the Shandong Provincial Natural Science Foundation(ZR2018BB014)
the Department of Science and Technology of Shan-dong Province(2019GGX102020)
the Source In-novation Project of Qingdao(171183jch)
Qingdao Postdoctoral Applied Research Project(2018111)
National College Students Innovation and En-trepreneurship Training Program(201910429007)