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Magnetic field effect in fluorescence of excited fluorophore equilibrated with exciplex that reversibly dissociates into radical-ion pair undergoing the spin conversion
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10.1063/1.4734306
/content/aip/journal/jcp/137/2/10.1063/1.4734306
http://aip.metastore.ingenta.com/content/aip/journal/jcp/137/2/10.1063/1.4734306
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, (solid lines) and exciplex, η e , (dashed lines) on the dielectric constant, ɛ. k s = 0.05 ns−1, k d = 0.16 ns−1, k f = 15000 Å3/ns, τ A = 14.8 ns, τ e = 14.0 ns. k b and k a are calculated by using Eqs. (2.12) and (2.13) with ΔG exc = −0.15 eV and ΔG I = 0.05 eV (red), ΔG exc = −0.20 eV and ΔG I = 0.0 eV (green), ΔG exc = −0.25 eV and ΔG I = −0.05 eV (blue). In each pair of the double-curves the upper corresponds to a high magnetic field while the lower to the zero one.

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 k s = 0.05 ns−1, k d = 0.16 ns−1, k f = 15 000 Å3/ns, τ A = 14.8 ns, τ e = 14.0 ns, (1) ΔG exc = −0.15 eV, ΔG I = 0.05 eV, (2) ΔG exc = −0.20 eV, ΔG I = 0.0 eV, (3) ΔG exc = −0.25 eV, ΔG I = −0.05 eV.

Image of FIG. 4.
FIG. 4.

The dependence of the MFE magnitude on fluorophore, χ, (a, blue) and exciplex χ e , (b, red) on the dielectric constant, ɛ, for a few values of k d . The parameters are k s = 0.05 ns−1, k f = 15000 Å3/ns, τ A = 14.8 ns, τ e = 14.0 ns, ΔG exc = −0.15 eV, ΔG I = 0.05 eV, (1) k d = 0.01 ns−1, (2) k d = 0.16 ns−1, and (3) k d = 2.0 ns−1.

Image of FIG. 5.
FIG. 5.

The dependence of the MFE magnitude on fluorophore, χ, (a, blue) and exciplex χ e , (b, red) on the dielectric constant, ɛ, for a few values of k f . The parameters are k s = 0.05 ns−1, k d = 2.0 ns−1, τ A = 14.8 ns, τ e = 14.0 ns, ΔG exc = −0.15 eV, ΔG I = 0.05 eV, (1) k f = 1000 Å3/ns, (2) k f = 104 Å3/ns, and (3) k f = 5 × 104 Å3/ns. The influence of the k f variation on χ e is very weak and is hardly seen.

Image of FIG. 6.
FIG. 6.

The dependence of the MFE magnitude on fluorophore, χ, (a, blue) and exciplex χ e , (b, red) on the dielectric constant, ɛ, for a few values of k s . The parameters are k f = 15 000 Å3/ns, k d = 2.0 ns−1, τ A = 14.8 ns, τ e = 14.0 ns, ΔG exc = −0.15 eV, ΔG I = 0.05 eV, (1) k s = 0.0005 ns−1, (2) k s = 0.005 ns−1, and (3) k s = 0.05 ns−1.

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/content/aip/journal/jcp/137/2/10.1063/1.4734306
2012-07-13
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic field effect in fluorescence of excited fluorophore equilibrated with exciplex that reversibly dissociates into radical-ion pair undergoing the spin conversion
http://aip.metastore.ingenta.com/content/aip/journal/jcp/137/2/10.1063/1.4734306
10.1063/1.4734306
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