news digest ♦ compound semiconductor
LED efficiency ‘boosted 20%’
2010-04-12
New manufacturing process could boost LED efficiency.
Research carried out by the National Renewable Energy Laboratory (NREL) has shown how new manufacturing processes could boost light-emitting diode (LED) efficiency by 20 per cent.
Technology Review reported that by combining yellow-green with other coloured LEDs and by utilising solar module manufacturing techniques, the energy efficiency of creating white light products could be improved by 20 per cent.
A breakthrough came when scientists were able to layer indium and gallium nitride compound semiconductors to bridge the gap between different sized crystals, thereby improving efficiency over phosphor-based LED designs.
Angelo Mascarenhas, team leader for solid- state spectroscopy in the Centre for Basic Sciences at NREL, stated: “If you try to do it in one shot, the whole thing will be defective. You have to grow a sequence of layers in a step- wise fashion.”
NREL is the primary laboratory for research into renewable energy and energy efficiency in the US. It began operating as the Solar Energy Research Institute in 1977, but later changed its name in 1991.
Cree go green with new LED alternative to 60-Watt incandescent lightbulb
2010-04-12
Thermal resistance of new platform is a 350% improvement on flagship predecessor
Cree today unveiled their latest product, the XLamp XM LED which delivers light output of 750 lumens at 2-Amps. Equivalent to a 60-
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www.compoundsemiconductor.net April/May 2010
watt incandescent, the bulb will use less than 7 watts. The new platform has a larger footprint than Cree’s XP family and is claimed to offer very high efficacy at very high drive currents. The thermal resistance of the XM platform is 2 degrees C per watt and is a massive improvement on the Cree XLamp XP-E LED.
Chuck Swoboda, Cree chairman and CEO remarked “We continue to set the pace for LED performance, establishing new benchmarks that make you wonder why anyone would consider last-century’s energy-wasting technology.”
“This new platform continues Cree’s well- established record of turning R&D innovations into products,” he added. The bulbs are expected to be commercially available from Fall 2010.
Along with GE who announced their 40-Watt LED equivalent last week, Cree are joining the LED lighting revolution to make the relatively energy-inefficient and environmentally unfriendly incandescent bulb obsolete.
Cree’s products families include LED fixtures and bulbs, blue and green LED chips, high- brightness LEDs, lighting-class power LEDs, power-switching devices and radio-frequency/ wireless devices.
Osram introduces System Integrator team to customize LED lighting solutions
2010-04-12
Projects will be speeded up by the link between LED users and specialists from OTE sectors
OSRAM Opto Semiconductors which manufactures LEDs, Infrared components, High-Power Laser Diodes and Intelligent Displays says the new concept which will provide an interface between the customer and the application.
Experts from optics, thermal management and electronics will liaise with the appointed system
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