Two-photon absorption and effective optical power-limiting properties of small dendritic chromophores derived from functionalized fluorene/oxadiazole units
- 作者：Tzu-Chau Lin ; tclin@ncu.edu.tw ; Ying-Hsuan Lee ; Bor-Rong Huang ; Chia-Ling Hu ; Yu-Kai Li
- 关键词：Two-photon absorption ; Two-photon-excited fluorescence ; Dendritic structure ; Optical power-limiting ; Fluorene ; Oxadiazole
- 刊名：Tetrahedron
- 出版年：2012
- 期刊代码：107_00404020
- 类别：ch
- 出版时间：24 June, 2012
- 卷：68
- 期：25
- 页码：4935-4949
- 文件大小：757 K
摘要
A set of novel multi-branched chromophores composed of four analogues with generic skeletons of donor-蟺-acceptor (D-蟺-A) derived from functionalized fluorene/oxadiazole moieties has been synthesized and experimentally shown to possess strong and wide-dispersed two-photon absorptivities in near infrared (NIR) region under the irradiation of femtosecond laser pulses. It is demonstrated that structural parameters, such as the size of 蟺-framework and the number of electron-donating units attached are closely connected to the molecular two-photon activities of these model compounds. Effective optical power-attenuation behaviors in the nanosecond time domain of the studied chromophores were also investigated and the results indicate that such dye molecules can be potential materials as broadband and quick-responsive optical-limiters especially against those laser lights with longer pulses.