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RESEARCHJuly 28, 2008Cheaper 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 |
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