title: Synthesis and photophysical properties of two-photon absorbing spirofluorene derivatives.
abstract: New spirofluorene-based quadrupolar two-photon absorbing dyes having triphenylamine and N,N-dibutylaniline as electron donors at the end of molcules were designed and synthesized. The third-order nonlinear optical properties of these compounds were studied using a two-photon excited fluorescence method. They were found to have high two-photon absorption cross-section owing to extended conjugation of the spirofluorene moiety. The effect of varying the donor strength could be discerned by comparing the two compounds. They were successfully used as a photosensitizers for two-photon initiated polymerization of three-dimensional micro-objects.
authors.affiliation: Department of Advanced Materials, Hannam University, 461-6 Jeonmin Dong, Yuseong-Gu, Daejeon 305-811, Korea.
authors.forename: Jea-Geon
authors.initials: JG
authors.lastname: Lim
authors.forename: Prém
authors.initials: P
authors.lastname: Prabhakaran
authors.forename: Jin Sun
authors.initials: JS
authors.lastname: Park
authors.forename: Yong
authors.initials: Y
authors.lastname: Son
authors.forename: Tae-Dong
authors.initials: TD
authors.lastname: Kim
authors.forename: Dong-Yol
authors.initials: DY
authors.lastname: Yang
authors.forename: Kwang-Sup
authors.initials: KS
authors.lastname: Lee