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Hyperfine interaction mechanism of magnetic field effects in sequential fluorophore and exciplex fluorescence
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10.1063/1.4795576
/content/aip/journal/jcp/138/12/10.1063/1.4795576
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/12/10.1063/1.4795576
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The scheme of the processes considered. The designations of the rate constants are presented.

Image of FIG. 2.
FIG. 2.

The dependence of the fluorescence quantum yield of the fluorophore, η, (a) and exciplex, η e , (b) on the dielectric constant, ɛ, in a zero magnetic field. The parameters are: D = 250 Å2/ns, A = 0.2 ns−1, k d = 0.10 ns−1, k f = 15 000 Å3/ns, τ A = 14.8 ns, τ e = 70.0 ns. k b and k a are calculated by using Eqs. (3.17) and (3.18) with (1) ΔG exc = −0.25 eV, ΔG a = −0.05 eV, (2) ΔG exc = −0.20 eV, ΔG a = −0.05 eV, (3) ΔG exc = −0.15 eV, ΔG a = −0.05 eV, (4) ΔG exc = −0.10 eV, ΔG a = −0.05 eV, (5) ΔG exc = −0.05 eV, ΔG a = −0.05 eV. Δr = 1 Å, this parameter is the same for all figures.

Image of FIG. 3.
FIG. 3.

The dependence of the MFE magnitude on fluorophore, χ, (a) and exciplex χ e , (b) on the dielectric constant, ɛ. The parameters are D = 250 Å2/ns, A = 0.2 ns−1, k d = 0.10 ns−1, k f = 15000 Å3/ns, τ A = 14.8 ns, τ e = 70.0 ns, (1) ΔG exc = −0.25 eV, ΔG a = −0.05 eV, (2) ΔG exc = −0.20 eV, ΔG a = −0.05 eV, (3) ΔG exc = −0.15 eV, ΔG a = −0.05 eV, (4) ΔG exc = −0.10 eV, ΔG a = −0.05 eV, (5) ΔG exc = −0.05 eV, ΔG a = −0.05 eV.

Image of FIG. 4.
FIG. 4.

The dependence of the MFE magnitude on fluorophore, χ, (a) and exciplex χ e , (b) on the dielectric constant, ɛ, for a few values of A. The parameters are D = 250 Å2/ns, k f = 15 000 Å3/ns, k d = 0.10 ns−1, τ A = 14.8 ns, τ e = 70.0 ns, ΔG exc = −0.15 eV, ΔG a = −0.05 eV, (1) A = 0.02 ns−1, (2) A = 0.10 ns−1, (3) A = 0.30 ns−1, (4) A = 0.70 ns−1, (5) A = 2.0 ns−1.

Image of FIG. 5.
FIG. 5.

The dependence of the fluorescence quantum yield of the fluorophore, η, (a) and exciplex, η e , (b) on the HFI constant, A, in a strong magnetic field (red) and weak magnetic field (blue). ɛ = 10, the rest of the parameters are the same as in Figure 4 .

Image of FIG. 6.
FIG. 6.

The dependence of the MFE magnitude on fluorophore, χ, (a) and exciplex χ e , (b) on the dielectric constant, ɛ, for a few values of k d . The parameters are D = 250 Å2/ns, k f = 15 000 Å3/ns, A = 0.2 ns−1, τ A = 14.8 ns, τ e = 70.0 ns, ΔG exc = −0.15 eV, ΔG a = −0.05 eV, (1) k d = 0.005 ns−1, (2) k d = 0.05 ns−1, (3) k d = 0.10 ns−1, (4) k d = 0.50 ns−1, (5) k d = 2.0 ns−1.

Image of FIG. 7.
FIG. 7.

The dependence of the MFE magnitude on fluorophore, χ, (a) and exciplex χ e , (b) on the dielectric constant, ɛ, for a few values of diffusion coefficient, D. The parameters are k f = 15 000 Å3/ns, k d = 0.10 ns−1, τ A = 14.8 ns, τ e = 70.0 ns, ΔG exc = −0.15 eV, ΔG a = −0.05 eV, A = 0.2 ns−1, (1) D = 50 Å2/ns, (2) D = 150 Å2/ns, (3) D = 250 Å2/ns, (4) D = 1000 Å2/ns, (5) D = 2000 Å2/ns.

Image of FIG. 8.
FIG. 8.

The dependence of the MFE magnitude on fluorophore, χ, (a) and exciplex χ e , (b) on the dielectric constant, ɛ, for a few values of k f . The parameters are D = 250 Å2/ns, k d = 0.10 ns−1, A = 0.2 ns−1, τ A = 14.8 ns, τ e = 70.0 ns, ΔG exc = −0.15 eV, ΔG a = −0.05 eV, (1) k f = 1000 Å3/ns, (2) k f = 5000 Å3/ns, (3) k f = 15 000 Å3/ns, (4) k f = 25 000 Å3/ns, (5) k f = 50 000 Å3/ns.

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/content/aip/journal/jcp/138/12/10.1063/1.4795576
2013-03-22
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hyperfine interaction mechanism of magnetic field effects in sequential fluorophore and exciplex fluorescence
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/12/10.1063/1.4795576
10.1063/1.4795576
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