Figure 3.

An opposite effective diffusion was measured for singlet excitons by TFM (red dots) and triplet excitons by TAM (blue dots), both of which were measured for an excitation density of 10¹⁹ cm^–3. The time evolution of the fwhm of the exciton clouds was fitted by simulations of the diffusion of singlet (red curve) and triple states (blue curve) using the model described in Figure 2 and parameters given in Table 2 with N₀ = 10¹⁹ cm^–3.