OSRAM has announced that a new flexible OLED with an efficiency of 32 lm/W has been developed in their laboratories. The device, which belongs to the top-emitting device group, is based on a thin steel foil with a thickness of roughly 0,1 mm and a luminance value of 1000nits. No data have been yet disclosed about device's lifetime.

UPDATE - OSRAM press-release on this topic is available at this link