Diodes have an anode wire (positive side) and a cathode wire (negative side) to facilitate this journey. The junction is a one-way trip current can only flow in one direction. The boundary between the two types where the electrons cross is called a p-n junction. Doping a semiconductor allows you to make two separate types of semiconductors in the same material. Pure lnGaN doesn’t have any electron holes to carry the electrical current so manufacturers add impurities or atoms of another material to create electron holes or free electrons. An electron hole occurs when an atom lacks electrons, which create a negative charged, and therefore the atom has a positive charge. light) in a process known as electroluminescence. When voltage is applied to the device, electrons fill in the electron holes in the semiconductor and simultaneously release energy as photons (i.e. LEDs commonly use indium-gallium-nitride (lnGaN) as their conductor material. In very general terms, a semiconductor is a substance or material with the ability to conduct an electrical current. LEDs or Light Emitting Diodes are actually one of the simplest types of semiconductor devices. Let’s take a look at the technology and science at work in lighting’s most efficient up-and-coming bulb.
They are known as “solid-state” lighting because solid matter produces the light no filaments or gases required. Incandescents and halogens use heated filaments while fluorescents and HID lamps pass electricity through gases to produce light. Prior to this post, we’ve covered gas and filament-based lighting.
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