U.S. Department of Energy - Energy Efficiency and Renewable Energy

Building Technologies Office – R&D Projects

Research Highlights 2005-2006

 

Picture of a lot of pink dots with light blue background in somewhat of a star formation, with darker blue and black spots around the edges.

Large-area Photonic Crystal LED Fabricated

Lumileds Lighting, the University of New Mexico, and Sandia National Laboratories have demonstrated uniform light emission from the largest-area photonic crystal LED ever fabricated. A large-area device that can be extended to a more engineered, full-wafer patterning tool is essential for low-cost, high-volume manufacturing. (October 2005) Learn more.

Photo of a bright white globe sitting on top of a column composed of many horizontal metal blades.

Advances in LED Chip Technology, Packaging

Significant advances in chip technology have enabled Cree, Inc.'s Santa Barbara Technology Center to demonstrate white LEDs with record efficacies as high as 74 lumens per watt - on par with fluorescent lighting systems and more than four times as efficient as incandescent sources. (November 2005) Learn more.

Photo of a horizontal rectangular device containing two white vertical panes side by side within a silver frame, with a cord coming out the back, sitting on a shiny surface, with a flower on its left.

New Efficiency Record for White OLED Device

Osram Opto-Semiconductors, Inc. has successfully demonstrated a white OLED with a record efficiency of 25 lumens per watt, the highest known efficiency achieved to date for a polymer-based white OLED. In another breakthrough, Osram has developed the first polymer-OLED, "tunable" light source. (November 2005) Learn more.

Photo of a bright white dome sitting on a square substrate, which in turn sits on a larger, thinner substrate

Breakthrough Performance in White LEDs

Cree, Inc.'s Santa Barbara Technology Center has achieved breakthrough efficacy greater than 65 lumens per watt in a white LED pre-production prototype. The improvement in brightness is particularly significant because it was achieved with Cree's standard XLamp® power LED package, rather than a developmental package. (December 2005) Learn more.

Photo of an LED light:  a white dome with a round silver collar on a flat square substrate, which is on a circuit board

LED Record Efficacy and Brightness

The Cree XLamp® power LED sets new records for LED brightness and efficacy, up to 85 lm/W at 350 mA.The XLamp utilizes Cree's performance breakthrough EZBright™ LED chip; both products include technology that was developed in part with R&D funding support from DOE. (October 2006) Learn more.

Photo of a light blue horizontal rectangle containing darker blue grid lines

Record EQE in Blue OLED Device

Scientists at Pacific Northwest National Laboratory have created a blue OLED device with an external quantum efficiency (EQE) of 11% at 800 cd/m2. This achievement was accomplished at a much lower operating voltage (6.2V) than previous demonstrations, revealing potential for much higher power efficiencies. (November 2006) Learn more.

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