![Source: Horst Frank - Original SVG version: download, CC BY-SA 3.0, https://commons.wikimedia.org/wiki/File:Electromagnetic_spectrum_-de.svg - Processing: The original picture was cropped. light-emitting diode](/images/spektrum_1_en.jpg)
The LED
The LED (= light-emitting diode) is a diode which is able to emit light. The color of the emitted light is influenced by the material used. When a voltage is applied between the two layers (there is a negatively doped layer (n) and a positively doped layer(p)) in the direction of the flux, the excess electrons migrate towards the p-layer. Recombination then occurs in the junction layer, resulting in flashes of light (photons).