Light‐Emitting Diodes

Abstract

LEDs are p-n junction devices made from extrinsic semiconductors. An n-type and a p-type semiconductor are put in contact with each other to form a p-n junction diode. The difference in doping creates a depletion region at the contact interface. In this region there are no stationary charges: an electric field is formed from the opposite charges of holes and electrons attracting each other. majority carriers (electrons from the n-type and holes from the p-type) from each side move through the depletion region.