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Selenium-Atom-Enhanced Triplet Exciton Kinetics in MR-TADF Photocatalysts for Ultrafast, High-Resolution, and
Yuyang Tang1, Yuanzhi Xu1, Haozheng Sun1
1Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, People's Republic of China.
Researchers developed a novel photocatalyst by engineering selenium-containing multiple-resonance thermally activated delayed fluorescence (MR-TADF) materials. This breakthrough enables highly efficient 3D printing in air using low-intensity light, significantly improving speed and resolution.
Area of Science:
- Materials Science
- Photochemistry
- 3D Printing Technology
Background:
- Digital Light Processing (DLP) 3D printing efficiency is limited by photoinitiating systems requiring inert atmospheres, high light intensities, or long exposure times.
- Existing systems often struggle with printing speed, resolution, and practical applicability due to these constraints.
Purpose of the Study:
- To develop a novel photoinitiating system for DLP 3D printing that overcomes the limitations of current technologies.
- To enhance printing efficiency, speed, resolution, and operational robustness in ambient conditions.
Main Methods:
- Molecular design paradigm utilizing multiple-resonance thermally activated delayed fluorescence (MR-TADF) materials.
- Selenium-atom engineering to transform MR-TADF materials into highly active triplet photocatalysts.
- Integration of carbonyl-assisted n-π*/π-π* state coupling and selenium-induced spin-orbit enhancement.
- Combination with a hypervalent iodonium co-initiator for photopolymerization.
Main Results:
- Achieved a near-unity intersystem crossing quantum yield and a high forward-to-reverse intersystem crossing rate constant ratio in the QPSO photocatalyst.
- Enabled rapid photopolymerization in ambient air using low-intensity blue light.
- Demonstrated single-layer curing in 1.5-2 seconds, achieving a printing resolution of 10 µm and a build speed of 72 cm/h at 400 µm layer thickness.
- Successfully fabricated complex hierarchical architectures with excellent biocompatibility.
Conclusions:
- The developed selenium-engineered MR-TADF photocatalyst system significantly enhances DLP 3D printing efficiency and applicability.
- This approach allows for rapid, high-resolution 3D printing in ambient air, opening new possibilities for advanced manufacturing.
- The platform shows promise for fabricating complex structures with good biocompatibility.
