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LED technology is completely based upon the semiconductors electronic theory. So to understand it completely, one requires in-depth knowledge of semiconductor physics. In a simpler way it can be explained as-


There are basically two types företagsskyltar of semiconductor material in term of energy band I.e., indirect band gap like silicon and direct band gap like gallium. LED is basically made with a combination of direct band gap materials. These material junctions when energized with voltage source releases energy in the form of photon I.e., packet of light. Different color from LED depends upon the band gap energy of the material.