Synthesis, Characterization And Application For Two-Photon Induced Photopolymerization Of Novel Organic Salts

The photo-chemical and physical process of two-photon absorption (TPA) materials is attracting increasing attention owing to their widely potential application. Although a number of reports showed that intramolecular charge transfer (ICT) organic salts have good photopolymerization properties, few efforts have been made to investigate two-photon absorption of ICT organic salts. Within this thesis, we designed and synthesized six ionic chromophores containing carbazole as the rigidπ-conjugate back-bone to form D-πA or A-π-D-π-A structures. We investigated one-photon and two-photon photophysical properties of these ICT organic salts, The results of photophysical properties revealed that the ionic salts exhibited large TPA cross section and low fluorescence quantum yields and could be regarded as a promising candidate for two-photon photopolymerization (TPP) photoinitiator. Finally salt la was applied to TPP as a photoinitiator. The thesis includes four chapters:1. The recent developments in the research for TPA materials and the basic principles and characterization of TPP were reviewed based on a great deal of related literatures.2. Carbazole derivatives were successfully synthesized in simple synthesis routes, which were characterized by ~1H NMR, MS and elemental analysis.3. The one-photon and two-photon photophysical of the chromophores were determined in solution. The experiment results showed that the ionic salts hold large TPA cross sections and low fluorescence quantum yields.4. Ionic salt la was successfully used as photoinitiator for TPP, which proved that the designing of ICT organic salts was reasonable.