News tagged with led
Soraa LED light may dim 50-watt halogen rivals
(PhysOrg.com) -- Soraa, a Fremont, California company founded in 2008, this week launched its first product, a light that uses LEDS (light emitting diodes). The "Soraa LED MR16 lamp" is the "perfect" replacement ...
Feb 09, 2012 |
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All set and ready to glow
A new technique that paves the way for manufacturing affordable LED light bulbs is to be exploited in the UK, in a deal that researchers say could have a dramatic impact on carbon emissions.
Technology / Energy & Green Tech
Feb 07, 2012 |
5 / 5 (1) |
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LED lights point shoppers in the right direction
Looking for an item in a large department store or mall can be like searching for a needle in a haystack, but that could change thanks to a hybrid location-identification system that uses radio frequency transmitters and ...
Jan 26, 2012 |
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Philips develops efficient solar powered LED street lighting
Philips has developed what is said to be the world’s most efficient and cost effective solar powered LED street lighting solution per km of road.
Technology / Energy & Green Tech
Jan 24, 2012 |
4.4 / 5 (7) |
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'Meating' a solution: Research finds that LED lights extend meat shelf life, save retailers money
A switch to LED lights in refrigeration units could save the retail meat industry millions of dollars each year, according to research from Kansas State University.
Jan 17, 2012 |
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Sony's next-generation 55-inch 'Crystal LED Display' prototype presented at CES
Sony announced that it has developed the next-generation self-emitting display, “Crystal LED Display,” and presents a Full HD, 55-inch prototype model at the 2012 International Consumer Electronics ...
Electronics / Consumer & Gadgets
Jan 11, 2012 |
5 / 5 (3) |
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Sky light sky bright - in the office
Working under the open sky – it sounds enticing, but it’s seldom really a practical option. Now, a dynamic luminous ceiling brings the sky into office spaces by creating the effect of passing clouds. ...
Jan 03, 2012 |
4.5 / 5 (6) |
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Alternative LED lighting combats energy crisis
Alternative lighting is emerging as a potent method to combat the energy crisis. Light-emitting diode (LED) lighting technologies could provide an innovative way to save energy and make wasteful lighting obsolete.
Technology / Energy & Green Tech
Nov 17, 2011 |
5 / 5 (5) |
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Using nanophotonics to reshape on-chip computer data transmission
A team at Stanford's School of Engineering has demonstrated an ultrafast nanoscale light emitting diode (LED) that is orders of magnitude lower in power consumption than today's laser-based systems and able ...
Nov 15, 2011 |
4.8 / 5 (11) |
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Researchers roll out a new form of lighting
In this month's edition of Physics World, Paul Blom and Ton van Mol from the Holst Centre in Eindhoven describe a way of creating thin, flexible sheets of organic light-emitting diodes (OLEDs) using a cheap, newspaper-style "roll- ...
Nov 01, 2011 |
4.7 / 5 (11) |
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Zinc oxide microwires improve the performance of light-emitting diodes
Researchers have used zinc oxide microwires to significantly improve the efficiency at which gallium nitride light-emitting diodes (LED) convert electricity to ultraviolet light. The devices are believed to ...
Oct 31, 2011 |
4.6 / 5 (11) |
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High-quality white light produced by four-color laser source
(PhysOrg.com) -- The human eye is as comfortable with white light generated by diode lasers as with that produced by increasingly popular light-emitting diodes (LEDs), according to tests conceived at Sandia ...
Oct 26, 2011 |
4.9 / 5 (9) |
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Do white LEDs disrupt our biological clocks?
You come into contact every day with light-emitting diodes (LEDs) -- they illuminate alarm clocks, new televisions, traffic lights, and smartphone displays. Increasingly, you will see white-light versions ...
Oct 17, 2011 |
4.5 / 5 (8) |
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Samsung researchers announce breakthrough in growing gallium nitride LEDs on glass
(PhysOrg.com) -- Everyone knows that the LED market is huge, it’s among other things, the technology behind our big screen TVs. That’s why so many companies are investing so much money in trying ...
Oct 10, 2011 |
4.7 / 5 (6) |
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LED startup Switch Lighting hopes to light the way in Silicon Valley
Silicon Valley is known for computer chips, software companies and social networks - but not light bulbs.
Technology / Energy & Green Tech
Oct 03, 2011 |
5 / 5 (4) |
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Light-emitting diode
A light-emitting diode (LED) (pronounced /ˌɛliːˈdiː/, or just /lɛd/), is an electronic light source. The LED was first invented in Russia in the 1920s, and introduced in America as a practical electronic component in 1962. Oleg Vladimirovich Losev was a radio technician who noticed that diodes used in radio receivers emitted light when current was passed through them. In 1927, he published details in a Russian journal of the first ever LED.
All early devices emitted low-intensity red light, but modern LEDs are available across the visible, ultraviolet and infra red wavelengths, with very high brightness.
LEDs are based on the semiconductor diode. When the diode is forward biased (switched on), electrons are able to recombine with holes and energy is released in the form of light. This effect is called electroluminescence and the color of the light is determined by the energy gap of the semiconductor. The LED is usually small in area (less than 1 mm2) with integrated optical components to shape its radiation pattern and assist in reflection.
LEDs present many advantages over traditional light sources including lower energy consumption, longer lifetime, improved robustness, smaller size and faster switching. However, they are relatively expensive and require more precise current and heat management than traditional light sources.
Applications of LEDs are diverse. They are used as low-energy indicators but also for replacements for traditional light sources in general lighting and automotive lighting. The compact size of LEDs has allowed new text and video displays and sensors to be developed, while their high switching rates are useful in communications technology.
For more information about Light-emitting diode, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
