Results 251 to 260 of about 156,793 (303)
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2011
Lighting technology is continuously improving for greater comfort, higher power efficiency and due to concerns about health and environment issues. The evolution of lighting technology through conversion of electricity into light led to the revolution in Light Emitting Diodes (LEDs).
Ramchandra Pode, Boucar Diouf
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Lighting technology is continuously improving for greater comfort, higher power efficiency and due to concerns about health and environment issues. The evolution of lighting technology through conversion of electricity into light led to the revolution in Light Emitting Diodes (LEDs).
Ramchandra Pode, Boucar Diouf
+4 more sources
2017
The 2014 Nobel Prize in Physics was awarded “for the invention of efficient blue light-emitting diodes (LEDs) which has enabled bright and energy-saving white light sources” [1, 2, 3], setting a clear target to mankind: energy-efficient and environmental-friendly light sources [4]. The first organic LED (OLED) was reported in 1987 by a team at Kodak [5]
Kordt, Pascal +5 more
openaire +2 more sources
The 2014 Nobel Prize in Physics was awarded “for the invention of efficient blue light-emitting diodes (LEDs) which has enabled bright and energy-saving white light sources” [1, 2, 3], setting a clear target to mankind: energy-efficient and environmental-friendly light sources [4]. The first organic LED (OLED) was reported in 1987 by a team at Kodak [5]
Kordt, Pascal +5 more
openaire +2 more sources
2011
Light-emitting diode (LED) photomodulation has become a recognized player in the world of lasers and light sources. It is used to treat a variety of clinical entities, including photorejuvenation, erythema-induced injury following laser and other cosmetic procedures, and acne vulgaris.
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Light-emitting diode (LED) photomodulation has become a recognized player in the world of lasers and light sources. It is used to treat a variety of clinical entities, including photorejuvenation, erythema-induced injury following laser and other cosmetic procedures, and acne vulgaris.
openaire +3 more sources
1998
Using blue-emitting GaN LEDs on SiC substrate chips as primary light sources, we have fabricated green, yellow, red and white light emitting diodes (LUCOLEDs). The generation of mixed colors, as turquoise and magenta, is also demonstrated. The underlying physical principle is that of luminescence downconversion (Stokes shift), as typical for organic ...
J. Baur, P. Schlotter, J. Schneider
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Using blue-emitting GaN LEDs on SiC substrate chips as primary light sources, we have fabricated green, yellow, red and white light emitting diodes (LUCOLEDs). The generation of mixed colors, as turquoise and magenta, is also demonstrated. The underlying physical principle is that of luminescence downconversion (Stokes shift), as typical for organic ...
J. Baur, P. Schlotter, J. Schneider
openaire +1 more source
Proceedings of the IEEE, 1972
Light-emitting diodes (LEDs) are devices designed to efficiently convert electrical energy into electromagnetic radiation, most of which is visible to the human eye. Some of the disciplines involved in the understanding and utilization of LEDs are reviewed, with emphasis on the III-V semiconducting compounds and GaP LEDs in particular. Salient features
A.A. Bergh, P.J. Dean
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Light-emitting diodes (LEDs) are devices designed to efficiently convert electrical energy into electromagnetic radiation, most of which is visible to the human eye. Some of the disciplines involved in the understanding and utilization of LEDs are reviewed, with emphasis on the III-V semiconducting compounds and GaP LEDs in particular. Salient features
A.A. Bergh, P.J. Dean
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2006
Revised and fully up-dated, the second edition of this graduate textbook offers a comprehensive explanation of the technology and physics of LEDs such as infrared, visible-spectrum, ultraviolet, and white LEDs made from III-V semiconductors. Elementary properties such as electrical and optical characteristics are reviewed, followed by the analysis of ...
openaire +1 more source
Revised and fully up-dated, the second edition of this graduate textbook offers a comprehensive explanation of the technology and physics of LEDs such as infrared, visible-spectrum, ultraviolet, and white LEDs made from III-V semiconductors. Elementary properties such as electrical and optical characteristics are reviewed, followed by the analysis of ...
openaire +1 more source
1999
Light Emitting Diodes (LEDs) convert electrical power to generally visible optical power and are simply p-n-junction devices, when biased in the forward direction. They produce light through spontaneous emission whose wavelength is determined by the bandgap of the semiconductor in which the carrier recombination takes place.
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Light Emitting Diodes (LEDs) convert electrical power to generally visible optical power and are simply p-n-junction devices, when biased in the forward direction. They produce light through spontaneous emission whose wavelength is determined by the bandgap of the semiconductor in which the carrier recombination takes place.
openaire +1 more source
The Yale Review, 2005 1990
Light-emitting diodes are simple compact optical sources which have certain attractions for use in digital optical transmission systems. They are easy to fabricate and therefore potentially cheap, can be modulated at high data rates, and emit moderate output powers which can be coupled reasonably efficiently into optical fibres.
M. J. Adams, I. D. Henning
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Light-emitting diodes are simple compact optical sources which have certain attractions for use in digital optical transmission systems. They are easy to fabricate and therefore potentially cheap, can be modulated at high data rates, and emit moderate output powers which can be coupled reasonably efficiently into optical fibres.
M. J. Adams, I. D. Henning
openaire +1 more source
2014
In this chapter, the basics of the light emitting diodes are reviewed. Since its invention in the 20th century, the light emitting diode has evolved into a major life-changer for human being. Most of the focuses have been on the family of GaN-based materials in the past two decades.
Chien-Chung Lin +8 more
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In this chapter, the basics of the light emitting diodes are reviewed. Since its invention in the 20th century, the light emitting diode has evolved into a major life-changer for human being. Most of the focuses have been on the family of GaN-based materials in the past two decades.
Chien-Chung Lin +8 more
openaire +1 more source