Figure 1: Schematic diagrams describing the FRET system. | Scientific Reports

Figure 1: Schematic diagrams describing the FRET system.

From: Energy transfer from an individual silica nanoparticle to graphene quantum dots and resulting enhancement of photodetector responsivity

Figure 1

(a) Band structures of SNP and GQD. Possible absorption/emission/transfer processes are described. Here, S0 and S1 indicate ground and lowest excited states, respectively. SNPs are highly absorptive, especially in the range of the emission spectrum of GQDs. Differently-colored PL of variously-sized GQDs ranges from UV to near-infrared region. (b) A schematic of a typical FRET system composed of SNPs and GQDs as donors and acceptors, respectively. Photo-excited electron-hole pairs occupy mostly the surface states of SNPs, thereby making it easy to transfer energy to adjacent GQDs. The distance at which the FRET efficiency drops to 50% is defined as the Förster radius (R0), typically in the range of 1–10 nm. The use of one-atom-thick GQDs for acceptors can minimize R0 and maximize the contacting area of the acceptors and the donors.

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