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. 2021 Apr 7;6(4):1461–1481. doi: 10.1021/acssensors.1c00183

Figure 2.

Figure 2

Schematic representation of the three main fluorescence mechanisms: photoinduced electron transfer (PET; a), resonance energy transfer (RET; b), and intramolecular charge transfer (ICT; c).21 D = donor; A = acceptor.