news digest ♦ LEDs LED on the same GaN-based chip.
in GaN on sapphire substrate,” by Z. Li et al in Applied Physics Letters, 102, 192107 (2013).
http://dx.doi. org/10.1063/1.4807125
This research was funded by the National Science Foundation through the Smart Lighting ERC, with additional support from New York state though Empire State Development’s Division of Science, Technology and Innovation (NYSTAR).
A cross-section of the new monolithically integrated GaN LED and HEMT
The device, grown on a sapphire substrate, demonstrated light output and light density comparable to standard GaN LED devices. Chow said the study is an important step toward the creation of a new class of optoelectronic device called a light emitting integrated circuit (LEIC).
Lumileds and Cree win $4.1 million in US DOE grants
The US Department of Energy has invested in five companies to drive cost-competitive next generation efficient LED lighting
Building on his strong focus on energy efficiency in his first few days in office, U.S. Energy Secretary Ernest Moniz has announced five manufacturing research and development projects to support energy efficient lighting products.
The projects will focus on reducing manufacturing costs, while continuing to improve the quality and performance of LEDs and organic LEDs (OLEDs). Today’s LED lighting is six or seven times more efficient than conventional lighting and can last up to 25 times longer. The Energy Department’s $10 million investment is matched dollar for dollar by private sector funding.
Monolithically integrated LED and HEMT structure on the same GaN chip. The device is seen here with the LED off (left) and with the LED on (right)
“Just as the integration of many silicon devices in a single chip - integrated circuits - has enabled powerful compact computers and a wide range of smart device technology, the LEIC will play a pivotal role in cost- effective monolithic integration of electronics and LED technology for new smart lighting applications and more efficient LED lighting systems,” Chow says.
“This new study, and the device we have created, is just the tip of the iceberg,” adds Smart Lighting ERC Director Robert Karlicek, a co-author of the study and ECSE professor at Rensselaer. “LEICs will result in even higher energy efficiency of LED lighting systems. But what will be even more exciting are the new devices, new applications, and new breakthroughs enabled by LEICs - they will truly usher in the era of smart lighting.”
This work is described in detail in the paper, “Monolithic integration of light-emitting diodes and power metal- oxide semiconductor channel high-electron-mobility transistors for light-emitting power integrated circuits
78
www.compoundsemiconductor.net July 2013
“This partnership with industry to produce affordable, efficient lighting will save consumers money and create American jobs,” says Energy Secretary Ernest Moniz. “It’s another example of how energy efficiency is a win- win proposition for our economy.”
According to a new report by the Energy Department, LED lamps and fixtures installed in the United States have increased 10-fold over the last 2 years - from 4.5 million units in 2010 to 49 million units in 2012. These installations, which include common indoor and outdoor applications such as recessed lighting and streetlights, are expected to save about $675 million in annual energy costs.
During the same period, the cost of an LED replacement bulb has fallen by about 54 percent. Switching entirely to LED lights over the next two decades could save the U.S. $250 billion in energy costs and reduce electricity consumption for lighting by nearly 50 percent. By 2030, LED lighting is projected to represent about 75 percent of all lighting sales, saving enough energy to power approximately 26 million U.S. households.
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