Large three-photon absorption and intramolecular charge transfer of the bis-donor fluorene-based molecules
✍ Scribed by Wenbo Ma; Yiqun Wu; Junhe Han; Donghong Gu; Fuxi Gan
- Book ID
- 103837134
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 165 KB
- Volume
- 752
- Category
- Article
- ISSN
- 0022-2860
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✦ Synopsis
Three-photon absorption (3PA) of two fluorene-based molecules with D-p-D structural motifs (abbreviated as BPAF and BCZF) has been determined by using a Q-switched Nd: YAG laser pumped with 38 ps pulses at 1064 nm in DMF. The measured 3PA cross-sections are 222 and 140!10 K78 cm 6 s 2 for BPAF and BCZF, respectively. AM1 calculations show that attaching different donors changes the charge density distribution of the fluorene skeleton, and it is observed that the 3PA cross-section can be enhanced with increasing intramolecular charge transfer character, measured by the parameter Dr 1 /Dr 2 /Dr 1 0 .