Figure 2.

Kinetics of the D-A triplet excitation transfer on a timescale Δt ∼ τ_tr(≪τ_dec) at Δε_D$\simeq$ε_IB > 0. The major contribution to the transfer process arises from the sequential route. If r_−i ≫ r_f, then probability of the formation of intermediate state I (with the ¹O^∗₂) can be rather large (a), whereas at r_−i ≪ r_f the noted probability is small (b). The calculations are based on Eqs. 6–9, and Eqs. A2, B5, and A17 (see the Supporting Material) (at G⁰_FI = Δε_IF$\simeq$ −Δε) with T = 0.025 eV(≈290 K), Δε_D = −0.05 eV, Δε_A = −0.15 eV, Δε = 0.2 eV, λ_D$\simeq$λ_BI = 0.05 eV, λ_A$\simeq$λ_BF = 0.05 eV, λ_DA$\simeq$λ_FI = 0.06 eV, $V_{{\text{O}}_2,D}$$\simeq$V_B,I = 5 × 10⁻⁴ eV, and $V_{A\mathrm{,}{\text{O}}_2}$$\simeq$V_F,B = 2 × 10⁻⁴ eV (a); and $V_{{\text{O}}_2,D}$$\simeq$V_B,I = 1.5 × 10⁻⁴ eV and $V_{A\mathrm{,}{\text{O}}_2}$$\simeq$V_F,B = 5 × 10⁻³ eV (b).