Research data supporting "Singlet exciton fission in a modified acene with improved stability and high photoluminescence yield" - Budden, Peter J.; Weiss, Leah; Müller, Matthias; Panjwani, Naitik; Dowland, Simon; Allardice, Jesse; Ganschow, Michael; Freudenberg, Jan; Behrends, Jan; Bunz, Uwe H. F.; Friend, R. H. (Apollo - University of Cambridge Repository, 2021)