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Nov 16th, 2011
Osram achieves efficiency record with flexible OLED
Osram researchers have developed a “flexible” OLED, which attained an efficiency of 32 lm/W.
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The company was able to achieve the record efficiency of 32 lm/W for a flexible OLED with the help of a special electrode design. The substrate for the OLED is a steel foil with a thickness of approximately 100 micrometers, meaning it is as thin as a sheet of paper. Light cannot shine through the opaque steel foil it would with rigid OLED on glass, but has to shine to the upper side.

Osram researchers hoped to subsequently produce the OLEDs for commercial applications, so both the OLED as well as the test was created as realistically as possible to ensure that it would allow the drawing of conclusions that could be applied to commercial applications. For this reason a large-surface OLED sample was tested, and not a smaller reference part. The brightness setting was fixed at 1,000 cd/m2. The measurements were made in an integrating sphere – without any manipulating macroextractors such as, lens assemblies, which would increasing the light yield.

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