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quality of the underlying seed and in certain cases then improve its quality as we continue to grow the crystal.”


“Additionally, optical transmission measurements show that our HVPE grown AlN materials have high transparency in the 200nm to 400nm spectral region, an important feature for UV LED applications, and a noted advantage over some competing AlN crystal growth approaches,” added Preble.


Moving smarter LEDs from Lab to Fab


The Smart Lighting ERC at Rensselaer Polytechnic Institute has engaged key industrial partners including Epistar and Osram to foster and guide LED innovations.


Now in its third year, the Smart Lighting Engineering Research Centre (ERC) has enlisted 21 key industrial partners to help guide the centre’s leading-edge research programs and hasten the transition of important innovations from the lab bench to the marketplace.


The centre is dedicated to developing new LED technologies and applications for smarter, better- performing lighting devices and systems. Launched in 2008 and funded primarily by the National Science Foundation, the ERC is led by Rensselaer Polytechnic Institute.


“The rapidly growing industry membership in the Smart Lighting ERC is a testimony to the quality of the transformative research being conducted on future lighting systems by the ERC faculty and students,” said ERC Director Robert Karlicek.


“It is also firm support for the ERC’s vision of smart lighting systems, which are poised to revolutionise lighting by creating immersive lighting systems that can sense their environment to provide new levels of energy efficiency, health and safety benefits, and enhanced workplace productivity.”


Among the centre’s industrial partners are leading LED companies including Osram Sylvania and Taiwan-based Epistar.


“Riding on the backbone of energy-efficient improvements in materials and performance, the Smart Lighting ERC is providing a state-of-the-art centre in which we from industry engage academia to prove concepts at platform levels, ahead of industry acceptance and uptake,” said Matthew Stough, director of engineering, materials and processes, and research coordinator at Osram Sylvania.


“Epistar is pleased to join the Smart Lighting Engineering Research Centre. Their work on transformative LED and lighting technology is of critical importance to the development of advanced solid state lighting systems, and we look forward to supporting those efforts as a member of the ERC,” said Steve Hong, director of research and development at Epistar.


While the promise of LEDs as a long-lived, energy- efficient heir to light bulbs is undeniable, the true promise of LED and solid-state lighting technology transcends illumination. LEDs offer the potential to control, manipulate, and use light in entirely new ways for a surprisingly diverse range of areas.


To realise the potential of solid-state lighting technology, the ERC team is working to create better LEDs, as well as new sensors and systems required to effectively to monitor and control these LEDs. More than 30 ERC faculty researchers at Rensselaer and partner universities are actively working toward this goal, along with dozens of student researchers, postdoctoral researchers, and visiting industry engineers.


Along with Rensselaer, core ERC university partners are Boston University and the University of New Mexico. ERC university outreach partners


July 2011 www.compoundsemiconductor.net 59


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