Contact and Distant Luminescence Quenching in Solutions

Figure 16

The charge separation, 𝜑, and triplet quantum yield, 𝜑_𝑇, as functions of diffusion started from 𝑟₀=7.55Å>𝜎 (𝜎=7.5Å). At zero magnetic field the recombination rates through singlet and triplet channels are 𝑘_𝑐=4800ų/ns and 𝑘_𝑡=50000ų/ns while the phenomenological rate of spin conversion is 𝑘_𝑠=0.15ns⁻¹ versus HFI constant 𝐴=4.8ns⁻¹. The solid lines result from the coherent theory of HFI-induced spin conversion, while the dashed lines are obtained with the model (incoherent) theory at 𝑘_𝑠=𝐴/32.