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OLED Achieves 32 Lumens Per Watt

Photonics.com
Jan 2012
MUNICH, Jan. 27, 2012 — Siemens AG announced that its Osram subsidiary has set a new efficiency record, developing a new organic LED (OLED) that generates 32 lumens of light per watt, making it more efficient than a halogen lamp.

Osram researchers have now produced in the lab a flexible OLED that emits white light from a surface measuring approximately 11 × 3 cm. The 32-lumens-per-watt device was feasible in part because of a special design for the vacuum-metallized electrical contacts. The record efficiency values were measured using a large-area sample under the most realistic conditions possible, and without any lenses or other devices to increase the light yield.


A flexible OLED from Osram has set a new efficiency record. In the lab, researchers produced a flexible OLED that emits white light from a surface measuring approximately 11 × 3 cm. The unit generates 32 lumens of light per watt of electricity, making it more efficient than a halogen lamp. (Image: Siemens)

One of the challenges associated with designing flexible OLEDs involves protecting the sensitive luminescent layer against oxygen and humidity. This is why flexible OLEDs are sealed using a special thin-film process rather than with a glass cover. A flexible steel foil no thicker than a sheet of paper was used instead of a glass sheet on the back of the OLED.

Siemens’ subsidiary has invested roughly €50 million (about $65.8 million) in developing OLEDs over the past five years. The company presented Orbeos, its first OLED product for this sector, two years ago and launched the world’s first pilot production facility in August 2011. To prepare the technology for mass market, Osram recently began offering Orbeos Dance, an introductory product that comes with an electrical ballast and connection accessories.

Siemens AG is an integrated technology company engaged in electronics and electrical engineering.

For more information, visit: www.siemens.com  



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