A Light Emitting Diode

A Light Emitting - The L IGHT EMITTING DIODE L E D Bill Zacharias A Light Emitting Diode a LED is a semiconductor device that emits light in an

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Unformatted text preview: The L IGHT EMITTING DIODE L E D Bill Zacharias 6/13/2010 A Light Emitting Diode, a LED, is a semiconductor device that emits light in an incoherent and narrow spectrum. The LED emits infrared and/or visible light when charged with an electric current; it is electrically biased in the forward direction. The light released by LEDs can be visible, infrared, or close to the ultraviolet region of the spectrum. The light which is emitted varies due to the composition and condition of the semiconducting material. LEDs are used in many different devices: alarm clocks, turn signals, traffic lights, and remote controls. The LED is a crucial link between electronics and photonics; LED, semiconductor lasers, send optical signals through telecom fibers providing broadband telecommunication and the Internet. LEDs are used in almost every element of our everyday lives, even though sixty years ago there was not even a single remote control (Britannica Online, 2010). The very first LED to be discovered in 1907, using the crystal of silicon carbine and a cat’s-whisker detector. These were called organic light-emitting diodes. In 1927, a Russian named Oleg Losev claimed the creation of the first LED, but no rational use of the LED came around until the 1960’s (Losev, 1927). In 1955, Rubi Braunatien of the Radio Corporation of America reported the first infrared emissions of gallium arsenide (GaAs) and additional semiconductor alloys; six years later Texas Instrument’s development team found when an electric current is applied gallium arsenide (GaN) gave off infrared light and shortly after...
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This note was uploaded on 04/21/2011 for the course PHYS 270 taught by Professor Danielhale during the Spring '11 term at DeVry Chicago.

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A Light Emitting - The L IGHT EMITTING DIODE L E D Bill Zacharias A Light Emitting Diode a LED is a semiconductor device that emits light in an

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