An Industry Perspective on Nitride LEDs for Solid State Lighting

Mr. James Ibbetson

About the Event

Rapid improvements in the efficiency of InGaN-based LEDs over the last few years have pushed solid state lighting past the "tipping point". Today, white-light-emitting high power LEDs are commercially available whose efficacy approaches 100 lumens per watt, which is significantly higher than compact fluorescent bulbs and several times better than incandescent bulbs. Yet their performance is still well below practical and theoretical limits. This talk will highlight the technical problems limiting the performance of state-of-the-art devices, with an emphasis on phosphor-converted blue LEDs that are the industry workhorse.

Biography

Dr. James Ibbetson has worked on high power LEDs for solid-state lighting applications since joining Cree in 1998. He currently leads the Advanced LED Development group at Cree Santa Barbara Technology Center (SBTC). For the last several years he and his team have been responsible for developing novel chip architectures aimed at efficient light extraction, low voltage operation, and wafer-level down-conversion. Technology first developed at Cree SBTC is incorporated in various Cree LED chip and package products available today, whose performance approaches 150 lumens per watt. Dr. Ibbetson earned his Ph.D. from the University of California, Santa Barbara in 1996.

Additional Information

Contact: Lisa J. Vogel

Phone: 647-1759

Email: lvogel@umich.edu

Sponsor: SSEL

Open to: Public