Siemens Unit Sets Record

Siemens AG of Munich has announced that its Osram subsidiary has set a new efficiency record, developing an OLED that generates 32 lm of light per watt, making it more efficient than a halogen lamp. Osram has produced a flexible OLED that emits white light from a surface measuring approximately 11 x 3 cm. The 32-lm/W device was feasible in part because of a special design for the vacuum-metallized electrical contacts. The 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.