Sometimes it feels like a full-time job trying to stay abreast of technological breakthroughs in additive manufacturing.  According to, Princeton University researchers have successfully 3D printed a unique type of  "quantum dot LEDs composed of five different materials." 


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The bottom layer of each quantum dot LED is composed of silver nanoparticles, which are perfect for connecting the LED to an electronic circuit. On top of that are two polymer layers that push electrical current up toward the next layer. This is where the real ‘quantum dots’ are - they’re nanoscale semiconductor crystals, in this case cadmium selenide nanoparticles wrapped in a zince sulfide shell. Each time an electron hits these nanoparticles, they emit orange or gree light. The color can be controlled by changing the size of the particles. The top layer is a comparatively ordinary gallium indium that directs the electrons away from the LED.”

Frankly, none of this sounds ordinary to me, especially the idea that these quantum dot LED displays aren't subject to the oxidation and humidity issues of current versions.  Unfortunately, the 3D printed components don't yet rival the quality of these mass-produced LEDs either.   I'm also guessing the cost to manufacture them isn't yet competitive either.






AuthorRenee Eaton