The difference is less prominent than for TIPS-Pn, but there is a clear emergence of a peak at ∼510 nm, concurrent with decreases in the amplitudes of S 1 features (relative to the GSB). We assign this peak to the absorbance of TIPS-Tn triplet excitons, consistent with the visible T 1 absorbance of other tetracene derivatives. Again, since no significant triplet formation was observed in the dilute TIPS-Tn solution, this triplet formation in the more concentrated solution must be due to SF.