Abstract
Novel A-π-D-π-A V-shaped 3,6-bis(phenylethynyl)carbazole based chromophores were designed and synthesized as two-photon polymerization (TPP) initiators combining a large two-photon absorption cross-section with facilitated radical formation. 9-Benzyl-3,6-bis(4-nitrophenylethynyl)carbazole (4d) shows a strong two-photon absorption around 800 nm and exhibits very high two-photon polymerization initiating sensitivity with a threshold power of 0.8 mW at the concentration of 0.18 mol%, which is much lower than the threshold power of 6.37 mW found for benzil. The corresponding threshold of laser exposure intensity for TPP is 3.0 × 107 mJ cm-2. The lowest loading of 4d is up to 0.012 mol% with a threshold power of 3.2 mW.
Original language | English |
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Pages (from-to) | 1433-1438 |
Number of pages | 6 |
Journal | Journal of Materials Chemistry |
Volume | 17 |
Issue number | 14 |
DOIs | |
Publication status | Published - Jan 1 2007 |
Externally published | Yes |
ASJC Scopus subject areas
- Chemistry(all)
- Materials Chemistry