Difference between revisions of "Light emitting diode"
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== Description == | == Description == | ||
| − | A small, solid, semiconducting crystals that produces light from electricity. Light emitting diodes, or LEDs, were first invented by General Electric in 1962. The light is emitted at a very narrow range of wavelengths by the transition of electrons between energy levels. These early red light emitting LEDs emitted low levels of light and were used in displays, sensors, and electronic equipment. In the 1990s, blue (450 nm), blue-green, violet, ultraviolet and and white LEDs were developed by Shuji Nakamura in Japan based on InGaN/AlGaN. These blue LEDS produce a light density which is about 100 times higher. These GaN based LEDs are being used for traffic lights, car headlights, TV displays, | + | A small, solid, semiconducting crystals that produces light from electricity. Light emitting diodes, or LEDs, were first invented by General Electric in 1962. The light is emitted at a very narrow range of wavelengths by the transition of electrons between energy levels. These early red light emitting LEDs emitted low levels of light and were used in displays, sensors, and electronic equipment. In the 1990s, blue (450 nm), blue-green, violet, ultraviolet and and white LEDs were developed by Shuji Nakamura in Japan based on InGaN/AlGaN. These blue LEDS produce a light density which is about 100 times higher. These GaN based LEDs are being used for traffic lights, car headlights, TV displays, copiers, and scanners. Because of their efficiency, these LEDs provide 50-70% energy savings when used to replace indoor lightbulbs and fluorescent tubes. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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LED | LED | ||
| − | == | + | ==Physical and Chemical Properties== |
Lifetimes estimated at 10,000 hours | Lifetimes estimated at 10,000 hours | ||
| − | == | + | ==Resources and Citations== |
| − | * | + | * GE Lighting: www.gelighting.com/na/institute/ul_last100.html - gives date of first diode as 1962 |
| − | * | + | * Eurotechnology.com on Blue LEDs at http://www.eurotechnology.com/bluelaser/blueslide15.html |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 13:03, 7 October 2022
Description
A small, solid, semiconducting crystals that produces light from electricity. Light emitting diodes, or LEDs, were first invented by General Electric in 1962. The light is emitted at a very narrow range of wavelengths by the transition of electrons between energy levels. These early red light emitting LEDs emitted low levels of light and were used in displays, sensors, and electronic equipment. In the 1990s, blue (450 nm), blue-green, violet, ultraviolet and and white LEDs were developed by Shuji Nakamura in Japan based on InGaN/AlGaN. These blue LEDS produce a light density which is about 100 times higher. These GaN based LEDs are being used for traffic lights, car headlights, TV displays, copiers, and scanners. Because of their efficiency, these LEDs provide 50-70% energy savings when used to replace indoor lightbulbs and fluorescent tubes.
Synonyms and Related Terms
LED
Physical and Chemical Properties
Lifetimes estimated at 10,000 hours
Resources and Citations
- GE Lighting: www.gelighting.com/na/institute/ul_last100.html - gives date of first diode as 1962
- Eurotechnology.com on Blue LEDs at http://www.eurotechnology.com/bluelaser/blueslide15.html