Princeton Team Prints Quantum Dot LEDs
3D printing turns out to be more versatile than expected
3D printing has so far been limited to specific plastics, passive conductors, and a few biological materials. But a team at Princeton has now successfully printed quantum dot-based LEDs, showing that diverse classes of materials can be 3D printed and fully integrated into devices with active properties.
In their report in Nano Letters, the researchers describe the seamless interweaving of five different materials: emissive semiconducting inorganic nanoparticles; an elastomeric matrix; organic polymers as charge transport layers; solid and liquid metal leads, and a UV-adhesive transparent substrate layer.
Having produced 3D printed quantum dot-based LEDs (based on CdSe nanoparticles wrapped in ZnS with a top layer of GaIn) as a proof of concept, they went on to show that it was possible to conformally print the LEDs onto curved surfaces, such as contact lenses.
A third example described in the paper was a 2x 2x 2 cube of encapsulated LEDs, in which every component of the cube and electronics was 3D printed. This was to demonstrate that 3D printing can make novel architectures not easily achieved using standard microfabrication techniques.
Overall, the team says that the results suggest that 3D printing is more versatile than has been demonstrated to date and is capable of integrating many distinct classes of materials.
"˜3D Printed Quantum Dot Light-Emitting Diodes' by Y. L. Kong et al, appears in Nano Lett. (2014). DOI: 10.1021/nl5033292
AngelTech Live III: Join us on 12 April 2021!
AngelTech Live III will be broadcast on 12 April 2021, 10am BST, rebroadcast on 14 April (10am CTT) and 16 April (10am PST)
and will feature online
versions of the market-leading physical events: CS International
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Thanks to the great diversity of the semiconductor industry, we are always chasing new markets and developing a range of exciting technologies.
2021 is no different. Over the last few months interest in deep-UV LEDs has rocketed, due to its capability to disinfect and sanitise areas and combat Covid-19. We shall consider a roadmap for this device, along with technologies for boosting its output.
We shall also look at microLEDs, a display with many wonderful attributes, identifying processes for handling the mass transfer of tiny emitters that hold the key to commercialisation of this technology.
We shall also discuss electrification of transportation, underpinned by wide bandgap power electronics and supported by blue lasers that are ideal for processing copper.
Additional areas we will cover include the development of GaN ICs, to improve the reach of power electronics; the great strides that have been made with gallium oxide; and a look at new materials, such as cubic GaN and AlScN.
Having attracted 1500 delegates over the last 2 online summits, the 3rd event promises to be even bigger and better – with 3 interactive sessions over 1 day and will once again prove to be a key event across the semiconductor and photonic integrated circuits calendar.
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