This video, by Jabulani Dhliwayo, introduces the PN-junction Light Emitting Diode (LED). It covers the Silicon based PN-junctions as well as compound semi-conductor (such as Gallium Arsenide) PN-junction, how the LED works and its limited use in optical communication. Understanding the LED is key to understanding the laser diodes used in optical communications. Also, understanding the PN-junction is the basis to understanding a plethora of semiconductor related concepts.
