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3. Photoinduced absorption and linear/nonlinear emission of assembled carbon dot–silica nanocomposites for cellular imaging.

Author

He, Jiangling, Chen, Xu, and He, Youling

Abstract

Carbon dot (CD)-based nanomaterials have become a popular candidate in biological fields due to their small size distribution, adjustable photoluminescence, high emission efficiency, quite low toxicity, etc. Herein, CDs were embedded into silica to construct CD–SiO2 nanocomposites, which realized efficiency and long afterglow (including TADF and phosphorescence components) in both powdery and aqueous states. We also observed the conversion process from saturable absorption (SA) to anti-saturation absorption as the monitoring source was a 760 nm ultrafast femtosecond laser. The two-photon excited fluorescence (2PEF) property of CD–SiO2 composites was also successfully confirmed and further applied in biological imaging, and it is more advantageous for cellular imaging than 1PEF. Besides, the phosphorescence signal from CD–SiO2 composites was also successfully applied in cancer cellular imaging. Moreover, the photoinduced absorption (PIA) phenomenon was first observed by nanosecond transient absorption (ns-TA) spectroscopy among CD-based nanomaterials, and the detected PIA was peaked at 466 nm comprising of a "faster" component and a "slower" component. CD–SiO2 composites can be a great candidate as the saturable absorber or the deeper-tissue imaging agent. [ABSTRACT FROM AUTHOR]

Published
2024
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