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12-12-2014, 09:28 PM
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Princeton Scientists 3D Printing LEDs Into Contact Lenses
Princeton Scientists 3D Printing LEDs Into Contact Lenses
 In the future, people with certain vision disorders and even healthy eyed folks will have access to electronic Contact Lenses that can improve and augment native vision. There are already advancements in that direction, but the challenge of being able to embed tiny electronic components Into such a small space may be the biggest hurdle. **w researchers at Princeton University have reported in journal Na** Letters the ability to use 3D Printing to produce multi-color LEDs on Contact lenses. The LEDs are made out of quantum dot na**particle crystals, the size of which defines which color they will generate. These Lenses still require an external power source to operate, but the proof of concept study effectively demonstrates that 3D Printing is a viable tech**logy to help miniaturize electronics for use in medical and other applications. From the study abstract in Na** Letters: Here, we show that diverse classes of materials can be 3D printed and fully integrated Into device components with active properties. Specifically, we demonstrate the seamless interweaving of five different materials, including (1) emissive semiconducting i**rganic na**particles, (2) an elastomeric matrix, (3) organic polymers as charge transport layers, (4) solid and liquid metal leads, and (5) a UV-adhesive transparent substrate layer. As a proof of concept for demonstrating the integrated functionality of these materials, we 3D printed quantum dot-based light-emitting diodes (QD-LEDs) that exhibit pure and tunable color emission properties. By further incorporating the 3D scanning of surface topologies, we demonstrate the ability to conformally print devices onto curvilinear surfaces, such as Contact lenses. Finally, we show that **vel architectures that are **t easily accessed using standard microfabrication techniques can be constructed, by 3D Printing a 2 × 2 × 2 cube of encapsulated LEDs, in which every component of the cube and electronics are 3D printed. Overall, these results suggest that 3D Printing is more versatile than has been demonstrated to date and is capable of integrating many distinct classes of materials.Study in Na** Letters: 3D Printed Quantum Dot Light-Emitting Diodes… Princeton press statement: Contact lens merges plastics and active electronics via 3-D printing… [IMG]http://ww-vb.mine.nu//feeds.feedburner.com/~r/Medgadget/~4/BQ1k3F2**ac[/IMG] المصدر: Forums Princeton Scientists 3D Printing LEDs Into Contact Lenses 
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