Figure 4.

(a) Schematic representation of the model. (b) Evolution of the width of the exciton distribution for initial densities 10¹⁷, 10¹⁸, and 10¹⁹ cm^–3 represented by pink, red, and dark red crosses, respectively, as measured by TFM. The solid curves are the simulations for the corresponding singlet exciton densities. (c) fwhm of the excitons probed by TAM for increasing excitation densities for the initial densities of 10¹⁹ (dark blue circles) and 5 × 10¹⁸ cm^–3 (blue circles). The solid curves are the simulations of the total number of triplet states (triplet pairs + free triplets).