Solution Based Cathode for Printable Light

Purpose and goal

Lightbulbs and LEDs can be replaced with alternatives that are both cheaper and more environmentally friendly. The goal of this ambitious project was to do that by utilizing a graphene ink based on reduced graphene oxide. Using this ink, light-emitting prototypes were made and evaluated. The results show that graphene oxide gives a small but positive effect. We have therefore developed better graphene inks with higher chemical resistance. These inks have given LunaLEC prototypes a 50% lifetime boost, which is very promising for the future.

Expected results and effects

The long term goal of LunaLEC is to allow for a sustainable and environmentally friendly fabrication of light. This means that the wish is to replace metals with carbon based materials. We have shown in this project that reduced graphene oxide can be used in LECs, and that other graphene materials can provide even better performance. Printable light is the goal, and graphene has the potential of turning our vision into reality.

Planned approach and implementation

This project has followed the initial plan, but has been expanded since early results indicated that reduced graphene oxide in solution has poor properties. Thanks to a close collaboration between LunaLEC and researchers at Umeå university, the work has adapted and continued. The new alternatives developed have shown clear positive results in LunaLEC´s tests.