Enhancement of two-photon initiation efficiency based on conjugated phenothiazine and carbazole derivatives. (September 2020)

• Record Type: Journal Article
• Authors: Li, Shanggeng; Lu, Chunlin; Wan, Xiangyu; Zhang, Shuai; Li, Jing; He, Zhibing; Zhang, Lin
• Is Part Of: Materials today communications. Volume 24(2020)
• Publication Date: 2020-09
• Subjects: Photoinitiator -- Two-photon absorption -- Phenothiazine -- Carbazole; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2020.101219
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: A series of initiators with conjugated A–π–D–π–A structure of phenothiazine and carbazole derivatives were designed and synthesized, which possess good two-photon polymerization initiation effect. Highlights: A new high efficiency two-photon polymerization initiator. A reference for designing new initiators. A reference for the parameter setting of additive manufacturing. Abstract: A series of new initiators with a conjugated A–π–D–π–A structure of phenothiazine and carbazole derivatives were designed and synthesized to satisfy the demand for novel high-efficiency two-photon polymerization initiators. Moreover, the optical properties and two-photon polymerization properties of such new initiators were investigated. It was found that the two-photon absorption cross section of the initiators with the best performance can reach 1315 GM at 780 nm, and the scanning speed could reach 14, 000 μm s −1 at a laser energy of 30 mW. When the wavelength was 810 nm, the absorption cross-section could reach up to 1667 GM. By adjusting the laser power and scanning speed, two-photon polymerization can be achieved within a large range of parameters, and complete and clear three-dimensional structures can be obtained.