Triplet fusion upconversion nanocapsules for volumetric 3D printing

被引:0
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作者
Samuel N. Sanders
Tracy H. Schloemer
Mahesh K. Gangishetty
Daniel Anderson
Michael Seitz
Arynn O. Gallegos
R. Christopher Stokes
Daniel N. Congreve
机构
[1] Rowland Institute at Harvard University,Department of Electrical Engineering
[2] Stanford University,undefined
来源
Nature | 2022年 / 604卷
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摘要
Three-dimensional (3D) printing has exploded in interest as new technologies have opened up a multitude of applications1–6, with stereolithography a particularly successful approach4,7–9. However, owing to the linear absorption of light, this technique requires photopolymerization to occur at the surface of the printing volume, imparting fundamental limitations on resin choice and shape gamut. One promising way to circumvent this interfacial paradigm is to move beyond linear processes, with many groups using two-photon absorption to print in a truly volumetric fashion3,7–9. Using two-photon absorption, many groups and companies have been able to create remarkable nanoscale structures4,5, but the laser power required to drive this process has limited print size and speed, preventing widespread application beyond the nanoscale. Here we use triplet fusion upconversion10–13 to print volumetrically with less than 4 milliwatt continuous-wave excitation. Upconversion is introduced to the resin by means of encapsulation with a silica shell and solubilizing ligands. We further introduce an excitonic strategy to systematically control the upconversion threshold to support either monovoxel or parallelized printing schemes, printing at power densities several orders of magnitude lower than the power densities required for two-photon-based 3D printing.
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页码:474 / 478
页数:4
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