Design of high efficiency for two-photon polymerization initiator: Combination of radical stabilization and large two-photon cross-section achieved by N-benzyl 3,6-bis(phenylethynyl)carbazole derivatives

Jin Feng Xing, Wei Qiang Chen, Jie Gu, Xian Zi Dong, Nobuyuki Takeyasu, Takuo Tanaka, Xuan Ming Duan, Satoshi Kawata

Research output: Contribution to journalArticle

44 Citations (Scopus)

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 languageEnglish
Pages (from-to)1433-1438
Number of pages6
JournalJournal of Materials Chemistry
Volume17
Issue number14
DOIs
Publication statusPublished - Jan 1 2007
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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