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- Title
Nonlinear optical property and ultrafast response of a two-photon photopolymerization initiator based on dibenzothiophene.
- Authors
Wang, Yaochuan; Liu, Dajun; Wang, Yizhuo; Wang, Guiqiu; Yu, Xiaoqiang
- Abstract
A dibenzothiophene-based two-photon photopolymerization (TPP) initiator named E,E-1,4-bis[3-vinyl-dibenzothiophene]-2,5-dimethoxybenzene (VBPMOB) with intense two-photon fluorescence (TPF) was investigated by UV-visible, fluorescence, pump-probe and time-resolved fluorescence spectroscopies. The maximum two-photon absorption (TPA) cross-section of VBPMOB in DMF was determined to be 274GM. In addition, the TPA cross-section at 800nm was 230GM, which is the most commonly used wavelength for TPP. The ultrafast spectra result indicated that after excitation, the VBPMOB molecule will first undergo a fast internal conversion process to form an intramolecular charge transfer (ICT) state with a certain width followed by relaxation of the ICT state with fluorescence emission.
- Subjects
PHOTOPOLYMERIZATION; DIBENZOTHIOPHENE; NONLINEAR optical materials; INTRAMOLECULAR charge transfer; TWO-photon-spectroscopy
- Publication
Journal of Nonlinear Optical Physics & Materials, 2017, Vol 26, Issue 4, p-1
- ISSN
0218-8635
- Publication type
Article
- DOI
10.1142/S0218863517500485