ETH scientists have further developed QLED technology for screens. They have produced light sources that for the first time emit high-intensity light in only one direction. This reduces scattering losses, which makes the technology extremely energy efficient.
QLED screens have been on the market for a few years now. They are known for their bright, intense colours, which are produced using what is known as quantum dot technology: QLED stands for quantum dot light emitting diode. Researchers at ETH Zurich have now developed a technology that increases the energy efficiency of QLEDs. By minimising the scattering losses of light inside the diodes, a larger proportion of the light generated is emitted to the outside.
Conventional QLEDs consist of a multitude of spherical semiconductor nanocrystals, known as quantum dots. In a screen, when these nanocrystals are excited from behind with UV light, they convert it into coloured light in the visible range. The colour of light each nanocrystal produces depends on its material composition.
Source: “Platelets instead of spheres make screens more economical”, Fabio Bergamin, ETH Zurich News.