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Led inventor nick holonyak reflects on discovery 50 years later - Outdoor Full Color Led Display Ma by icdenta icdenta
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Led inventor nick holonyak reflects on discovery 50 years later - Outdoor Full Color Led Display Ma by ICDENTA ICDENTA
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| Article Posted: 10/15/2013 |
| Article Views: 100 |
| Articles Written: 1096 - MORE ARTICLES FROM THIS AUTHOR |
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Led inventor nick holonyak reflects on discovery 50 years later - Outdoor Full Color Led Display Ma |
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Business,Business News,Business Opportunities
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Fifty years ago today, 33-year-old GE scientist Dr. NickHolonyak, Jr., invented the first practical visible-spectrumlight-emitting diode (LED), a device that GE colleagues at the timecalled the magic one because its light, unlike infrared lasers,was visible to the human eye. "If they can make a laser, I can make a better laser than anyof them because I ve made this alloy that is in the red visible.And I m going to be able to see what s going on. And they restuck in the infrared." In an interview with GE Lighting conducted in his University of Illinois lab on September 19,2012 about three weeks ahead of the 50 th anniversary of his invention of the LED a now 83-year-oldHolonyak recounts the competitive forces that propelled him towardhis moment of discovery in a GE lab: If they can make a laser, Ican make a better laser than any of them because I ve made thisalloy that is in the red visible. And I m going to be able to seewhat s going on.
And they re stuck in the infrared. LED 50 th Anniversary: Holonyak s path to discovery When Holonyak joined GE s team of researchers in 1957, GEscientists and engineers were already researching semiconductorapplications and building the forerunners of modern diodes calledthyristors and rectifiers. While GE scientist Dr. Robert N. Hall was working toward realizinga semiconductor laser in the infrared with GaAs (Gallium arsenide),Holonyak aimed for the visible with GaAsP (Gallium arsenidephosphide).
Hall used polishing to form laser mirrors, whileHolonyak tried to form the mirrors by cleaving. On October 9, 1962,with GE colleagues looking on, Holonyak became the first person tooperate a visible semiconductor alloy laser the device thatilluminated the first visible LED. Fifty years removed from Holonyak s invention, new, robust andlong-lasting LEDs have been incorporated to serve as light sourcesin countless applications ranging from the mundane to missioncritical. LEDs are literally everywhere, notes Mary Beth Gotti, managerof the GE Lighting Institute , a teaching facility at GE Lighting s 100-year-old Nela Parkworld headquarters in East Cleveland, Ohio.
LEDs provide lightingin a variety of electronic devices and indicators, includingelevator buttons, exit signs, cell and smart phone displays, TVs,PCs, tablet computers, commercial signage, full motion videoscreens in sports venues, microscopic surgical equipment, railroadcrossings and airport taxiway lights. And they are now hittingmainstream lighting applications like parking lots, roadways,accent lighting, general lighting and more. Businesses such as Starbucks , Walmart , Target and Marriott believe in the power of Holonyak s invention. They understandthat LED systems deliver value not just through energy-costsavings. Maintenance-cost savings are significant because LEDs lastlonger than any other light source.
The LED value propositionisn t reserved for retail giants operating thousands of locations.Smaller regional grocers and other retail chains, such as Food City and Wawa , are getting in on the act. One of the fastest growingapplications of LED systems roadway and area lighting holds appeal for cities as big as Las Vegas and as small asSuperior, Nebraska , population 2,000. Holonyak, in the GE interview, remembers feeling that he was ontosomething big when the magic one first illuminated: I knowthat I m just at the front end but I know the result is sopowerful there s no ambiguity about the fact that this has got alife way beyond what we re seeing. Holonyak has called the LED the ultimate lamp because thecurrent itself is the light.
As a result, an LED can have lowerlosses and higher efficiencies than other lighting technologies. How LEDs work LEDs are small light sources or thin chips that become illuminatedby the movement of electrons through a semiconductor material.Today, LEDs are available in multiple colors, including the bright,white light consumers are used to seeing from their home lighting.LEDs are embraced for their energy savings and long life. They useup to 75 percent less energy than incandescent sources, last up to25 times longer than incandescent and halogen light sources and upto three times longer than most CFLs. They also are cooler to thetouch, start instantly, and the compact shape of LEDs allows forsmaller, design-forward lighting fixtures, as well as illuminationin tight areas.
Nick Holonyak is a national treasure, notes Gotti. Hiscuriosity and drive to explore and invent have inspired thousandsof students and countless innovations. It s breathtaking toconsider the widespread and profound impact of the magic one that Nick Holonyak brought to life 50 years ago. Visit www.ece.illinois.edu/ to explore learning opportunities available through the Departmentof Electrical and Computer Engineering at the University ofIllinois at Urbana-Champaign. Visit and LightingWeb/na/case-studies/ to learn more about LED and other energy-saving lightingtechnologies from GE.
For more photos and downloadable Broll, visit the GE pressroom . About GE Lighting GE Lighting invents with the vigor of its founder Thomas Edison todevelop energy-efficient solutions that change the way people lighttheir world in commercial, industrial, municipal and residentialsettings. The business employs 16,000 people in more than 100countries, and sells products under the Reveal and Energy Smart consumer brands, and Evolve , GTx , Immersion , Infusion , Lumination and Tetra commercial brands, all trademarks of GE. General Electric(NYSE: GE) works on things that matter to build a world that worksbetter.
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