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Tuning Spectral and Temporal Response of UV-pumped Colloidal Quantum Dots Dispersed Within Additively-Manufactured Structures
Additive manufacturing is opening up new ways to make structures. Consequently, there are a growing areas of research in using additive manufacturing with nanomaterials. This paper investigates a novel fabrication technique which utilizes 3D printed honeycomb structures loaded with colloidal quantum dots through external dispersion and capped with SU-8-5 photoresist. Both the thickness of the 3D printed structure and the volume of colloidal quantum dots loaded into the aforementioned 3D printed structures affects both the photoluminescence spectra and photoluminescence lifetime decay of the overall sample. A charge transfer peak at ~460 nm is observed in this process, which exhibits photoluminescence intensity tunability. It has been found that both the relative photoluminescence intensity at the charge transfer peak (0.197 to 0.874) and the photoluminescence lifetime decay at the colloidal quantum dots main peak of emission (15.5 ns-77.7 ns) are tunable by tweaking the fabrication process. These findings pave the way for future optimization of this technique for sensing applications.
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