Spatially confined photoexcitation with triplet–triplet annihilation upconversion. Issue 72 (18th August 2021)

• Record Type: Journal Article
• Authors: Wang, Zhijia; Hou, Yuqi; Huo, Zepeng; Liu, Qiang; Xu, Weiqing; Zhao, Jianzhang
• Is Part Of: Chemical communications. Volume 57:Issue 72(2021)
• Page Start: 9044
• Page End: 9047
• Publication Date: 2021-08-18
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/d1cc03309c
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : Spatially confined photoexcitation was achieved with triplet–triplet-annihilation upconversion, accomplished with a weak cw-laser and demonstrated by photopolymerization. Abstract : Two-photon absorption (TPA) has been widely used in confocal microscopy, photo-initiated three-dimensional (3D) polymerization, and 3D-micro/nanofabrication. These applications are based on the spatial confinement of the TPA excitation, due to the quadratic excitation power dependency of the excitation. However, an expensive and high-power femtosecond (fs) pulsed laser has to be used. Herein, we show a new technique as a promising alternative to the TPA to achieve spatially confined excitation, but no fs laser and TPA dyes are required. This new spatially confined excitation with a continuous wave laser is based on triplet–triplet-annihilation upconversion. The potential of the new technique was demonstrated by spatially confined photopolymerization.