Tuning two-photon absorption cross-sections for triphenylamine derivatives

• Main Authors: Fang, Zhen, Webster, Richard David, Samoc, Marek, Lai, Yee-Hing
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Science::Chemistry
• Online Access: https://hdl.handle.net/10356/106338; http://hdl.handle.net/10220/17963; http://dx.doi.org/10.1039/c3ra42789g
• Institution: Nanyang Technological University

A methylene bridge link connecting the ortho-positions within the triphenylamine scaffold increases the molecular planarity significantly. The one-photon spectroscopies of bridged triphenylamine molecules show considerable extended conjugation relative to their triphenylamine counterparts, leading to enhanced two-photon absorption (TPA) cross-sections. Various substituents at the scaffold have been prepared and studied. Using a femtosecond laser source Z-scan method, the TPA cross-sections were characterized. The maximum magnitude of the TPA cross-section is [similar]4800 GM, which is four times that of its triphenylamine counterpart.