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. 2021 Jul 14;9:676928. doi: 10.3389/fchem.2021.676928

Figure 2.

Figure 2

Fluorescence properties of PbS QDs+Tat and the labeling of ADSCs. (A) Schematic of synthesis of PbS QDs+Tat and labeling of ADSCs. (B) NIR-II imaging of PbS QDs labeled ADSCs in the state of suspension and (C) after centrifugation. (D) NIR-II imaging (λex: 808 nm, exposure time: 1 ms) of the same PbS QDs+Tat in a time course (0, 7, 14, 21, and 28 d post-preparation). (E) PL intensity of the same PbS QDs+Tat after storage. (F) PL intensity of PbS QDs and PbS QDs+Tat under different exposure time. (G) Normalized PL spectra of PbS QDs and PbS QDs +Tat.