Osram has announced the company's researchers have developed a flexible OLED, that achieved an efficiency of 32 lm/W - which according to Osram is a "record value." Osram considers this achievement to be an important milestone on the road to broad commercial application of flexible OLED. The dual achievement of both high efficiency and consistent device performance is prerequisite to ensure that OLED can secure commercially adoption as complementary lighting technology to LED.
Osram researchers wanted to fabricate a commercially realistic device and so chose to make large area devices, on a 100micrometer thick steel substrate, using a “special electrode”. The OLED devices where operated at a brightness of 1,000 cd/m². Efficiency measurements were made in an integrating sphere – without using any enhancing or manipulating macroextractors such as, for instance, lens assemblies, which have the purpose of increasing the light yield.
Ulrich Eisele, head of OLED at Osram, said, “With this research success, Osram further underscores its leading position in the field of OLED.”
Thomas Dobbertin, head of technology, added, “with this sample, we are able to demonstrate that flexible OLED can already be significantly more efficient than halogen lamps. This was only made possible thanks to our ability to transfer our strong competence in the field of vacuum processing of organic functional materials and space saving thin film encapsulation onto flexible OLED.”
The research results were achieved with support under the project TOPAS2012. A joint project of the Federal Ministry of Education and Research (grant project number 13N10474). The objective of the project is to further develop OLED as lighting of the future.