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Updated: May 19, 2026

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Synthesis and photophysical properties of two-photon absorbing spirofluorene derivatives
Jea-Geon Lim1, Prém Prabhakaran, Jin Sun Park
1Department of Advanced Materials, Hannam University, 461-6 Jeonmin Dong, Yuseong-Gu, Daejeon 305-811, Korea.
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.
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