TPA 9.9 × 10 7 0.5 9.1 × 10 6 (S 1 /T 4 ) 202 (T 3 /S 2 ) IPA 1.7 × 10 8 9.9 1.8 × 10 11 (S 1 /T 1 ) 523 (T 2 /S 1 ) role of triplet states in more detail. Our previous study showed that triplet states can be affected differently than singlet states in a solid-state environment. Experimentally, in addition to PF, both systems show DF and RTP, which are directly linked with the population of triplet states.