What are LEDs?
CaptionLEDs (Light Emitting Diodes) are electronic light sources based on so-called semiconductors, e.g. gallium, silicon or arsenic. For high luminous efficiency, they have to be absolutely pure and have to comply with certain requirements. In order to achieve this, a razor-thin semiconductor base layer (wafer) is put in a vacuum chamber and covered with a molecular coating. This process is called MBE (Molecular Beam Epitaxy) and may also be described as the breeding of crystals. After impurity atoms have been implanted into the pure crystalline structures, the wafer is cut into microscopically small units. These semiconductors unite different poles (anode and cathode) and later constitute a light chip. Light emitting diodes are microstructure solids and completely shock resistant. They last a 1,000 times longer than conventional light bulbs, put halogen bulbs in the shade, hardly give off any heat and consume less power. LEDs contain no detrimental filling gases and emit no ultraviolet light.
CaptionThe modern concept of the photon was developed by Albert Einstein, the father of the theory of relativity. The term “photon” describes the smallest indivisible unit of light.
What happens within the Light Chip?
CaptionThe electrons of the light diode faithfully circle their nuclei. However this kind of atomic monogamy comes to an end as soon as sufficient voltage (supply of energy) is applied. Electrically aroused, the electrons start to disengage from their atomic union in order to join a foreign atom. Their "collision" with the new atomic union generates energy that is released in the shape of small light units, so-called photons.