RESEARCH
July 28, 2008

Cheaper white LEDs on deck

The main hurdle to replacing incandescent lights with much more efficient light-emitting diodes is lowering the cost. Researchers have been looking to silicon for a solution. A method for making gallium nitride LEDs on silicon wafers rather than sapphire is a significant step toward affordable solid-state lighting.

The process involves forming a reflective layer of zirconium nitride on silicon, covering it with aluminum nitride and topping it off with the light-emitting gallium nitride. This opens the way to making many white LEDs at once on the silicon wafers used to make computer chips.

Research paper:
Organometallic Vapor Phase Epitaxial Growth of GaN on ZrN/AlN/Si Substrates
Applied Physics Letters, published online July 16, 2008

Researchers' homepages:
Timothy D. Sands
Eric A. Stach

Related stories and briefs:
Lens boosts LED efficiency -- a different way to improve LEDs

Further info:
Department of Energy solid-state lighting page


Back to ERN July 28/August 4, 2008

Share



Feeds

News  | Blog

E-mail headlines

Energy-related books and products from Amazon.com

Home   Archive   Eric on Energy   Researchers   Links   About   Contact
© Copyright Technology Research News 2008-2010. All rights reserved.