Printed LED

Improved optical and electronic features

For the first time scientists have produces LEDs by means of inkjet printing with a hybrid Perowskit semiconductor material. Until now this was only possible for the production of solar cells but not light-emitting diodes. This is a technique to henceforth produce high-performance, bright LEDs and other electronic parts in a simple and affordable way.

Researchers of Helmholtz-Zentrum Berlin (HZB) and Humboldt university (HU) intend to leave the “zoo of materials and methods“ with this technology and believe they are on the way to a new standard. Hybrid Perowskit materials promise to be a feasible solution – semiconducting materials whose organic and inorganic elements are arranged in a certain crystalline structure. They are made of a fluid solution instead of building up the component layer by layer from a substrate. A so called “seed crystal“ is the key to this process. It is an added salt which attaches itself to the substrate and serves as framework for the development of the Perowskit structure.

Improved optical and electronic features
The LEDs which are thus printed have a higher luminosity and a significantly better electrical property than any additive manufacturing process could bring about. In the Berlin lab of HZB and HU all relevant electronic components shall now be produced step-by-step with this technique.

The results are published in “Journal Materials Horizons“ under the title “Finally, inkjet-printed metal halide perovskite LEDs – utilizing seed crystal templating of salty PEDOT:PSS“.