Fig. 1: Structural and optical properties of TET blends.
From: Vacancy control in acene blends links exothermic singlet fission to coherence
a Chemical structures of TET, PEN, PIC and 6PH. b–d In-plane unit cell parameters a and b and out-of-plane lattice spacing d for TET blends with varying concentrations of spacer molecules. The areas shaded in light green denote the range of TET fractions relevant for this study. The legend in b applies to b–d. The error bars have been determined as 2% of the experimental value. e, f Absorption spectra (solid lines) and photoluminescence (PL) spectra (shaded areas), offset for clarity, for e TET:6PH blends and f TET:PIC blends. g, h Decomposition of the PL spectra with differing TET fractions into five contributions, depending on the number of TET neighbours for a given TET molecule (numbers given in the bars; see also Figs. S6-S8). The monomer contribution corresponds to 0 TET neighbours while the bulk contribution corresponds to 4 TET neighbours. For details, see text.
