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“To date, 3D printing has been limited to specific plastics, passive conductors, and some biomaterials. Here, we show different types of materials that can be 3D printed, and can be flexibly made into a variety of equipment components. We will Demonstrates seamless interweaving of five different materials, including (1) radioactive semiconductor inorganic nanoparticles, (2) elastic materials, (3) organic polymers as charge transport layers, (4) solid and liquid metal leads, and (5) ultraviolet light Bonding transparent matrix layers. To conceptually verify the comprehensive functionality of these materials, we 3D printed quantum dot-based light-emitting diodes (QD-LEDs), which demonstrate pure and harmonious color emission performance. Further combined with surface topology 3D scanning We can display conformal print products on curved surfaces, such as contact lenses.
This is not McAlpine's first breakthrough test in 3D printing. Last year, he used a live cell, hydrogel, and conductive ink to print a bionic ear that received a radio signal through a live coil.
McAlpine selected conductive inks for its next-generation 3D printed semiconductor materials. He and his team must make their own 3D printers to accommodate a variety of materials and be able to print on a micron scale. According to McAlpine, LEDs are just one part of the 3D printing of active electronic devices. He is looking at "something that people can't imagine now, such as the 3D structure that can be used in the human body." A biomimetic implant that uses light to stimulate nerves is one of the development directions.
McAlpine is further developing the possibility of 3D printing. According to him, he has used this technology to print a biomedical device that is currently being tested on animals and has begun to use living cells to make complex electronic devices. 
The United States has developed the world's first fully 3D printed LED to bionic plants
The research team led by Michael McAlpine, assistant professor of plastics at Princeton University, has produced the world's first fully 3D printed LED. Processing involves interlaced printable electrodes, polymers, and semiconductors, all suspended in a solvent to prevent materials from attaching to each other during printing. This technology can be used to make products such as smart contact lenses and electronic implants.