Working principle
The light emitting diode (LED) is made of several layers of semiconductor material.
A current passing through this diode triggers a recombination of electrons between two energy levels, leading to the emission of photons.
Thanks to the semiconductor’s composition, every wavelength of the visible luminous spectrum can be obtained.
![](https://www.lucisbio.com/wp-content/uploads/2018/06/tech-slider1.jpg)