Abstract
3D direct-writing via photopolymerization based on two-photon absorption (TPA) can achieve excellent out-of-plane resolution. The key to this technology is a quadratic intensity dependence in photoexciting the TPA photosensitizers. Triplet-triplet annihilation (TTA) also has similar nonlinear light-intensity dependence. As a result, TTA can also generate spatially confined excitation near the beam focus. Combining the photopolymerization reaction with the TTA system composed of palladium porphyrin and diphenylanthracene, 3D direct-writing micro-fabrication based on photopolymerization and the TTA was realized. The out-of-plane resolution can reach 10 µm under continuous-wave laser excitation. TTA-based 3D direct-writing technology does not need an expensive femtosecond pulsed laser, showing the potential of a next-generation 3D printing technology.
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This work was supported by the National Key R&D Program of China (2021YFA1502500), the National Natural Science Foundation of China (22125502 and 22071207).
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Wang, Z., Zhang, Y., Su, Y. et al. Three-dimensional direct-writing via photopolymerization based on triplet—triplet annihilation. Sci. China Chem. 65, 2283–2289 (2022). https://doi.org/10.1007/s11426-022-1380-6
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DOI: https://doi.org/10.1007/s11426-022-1380-6