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Three-photon absorption (3PA) of two fluorene-based molecules with D–π–D structural motifs (abbreviated as BPAF and BCZF) has been determined by using a Q-switched Nd: YAG laser pumped with 38ps pulses at 1064nm in DMF. The measured 3PA cross-sections are 222 and 140×10 −78 cm 6 s 2 for BPAF and BCZF, respectively. AM1 calculations show that attaching different donors changes...
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