A 3D printer has been used to fabricate an entire quantum dot (Q)LED stack on a rigid glass contact lens. The group deposited the LED stack and connectors on a complex non-planar surface – a contact lens. This highlights its potential to ultimately enable a new generation of electronically-enhanced ocular devices, … as more 3D print system are adapted to deposit integrated circuitry.
The breakthrough by the team from Princeton’s McAlpine Research Group was announced in a paper in Nano Letters on 31 October. The authors note that previously: ‘3D printing has been limited to specific plastics, passive conductors, and a few biological materials.’
The research has shown the feasibility of simultaneously 3D printing a range of complex materials that constitute an LED stack from a computer-aided design (CAD) file. These included inorganic quantum dot nanocrystals, an elastomeric matrix, organic polymer charge transport layers, solid and liquid metal leads, and a UV-adhesive transparent substrate layer. … (read more)