Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics - Speller,EM; McGettrick,JD; Rice,B; Telford,AM; Lee,HKH; Tan,C-H; De,Castro CS; Davies,ML; Watson,TM; Nelson,J; Durrant,JR; Li,Z; et al. (ACS APPLIED MATERIALS & INTERFACES, 2017)