High efficiency plastic OLEDs

Researchers have developed the world’s most efficient organic light emitting diodes (OLEDs) on plastic. This research is done by the researchers from University of Toronto’s Department of Materials Science and Engineering.


This research is published in the October issue of Nature Photonics.

OLED are made of emissive electroluminescent film of organic compounds, which emit light in response to light. They represent low-energy and high contrast displays used in cell phones and other such applications.

Traditional OLED depends on heavy metal doped glasses, which make them highly efficient and bright along with some disadvantages of increase in expense of manufacturing, rigidity, heaviness and fragility. However, this research allows to manufacture not only efficient but also flexible and less costly OLED.

Zheng-Hong Lu, Professor of Materials Science and Engineering, said, “For years, the biggest excitement behind OLED technologies has been the potential to effectively produce them on flexible plastic.”

Researchers successfully created the high-refractive index property by using a 50-100 nanometer thick layer of tantalum(V) oxide (Ta2O5), which is an advanced optical thin-film coating material. “In these devices, multifunctional anode stacks, consisting of a high-index Ta2O5 optical coupling layer, electrically conductive gold layer and hole-injection MoO3 layer, are collectively optimized to achieve high efficiency.” These helped in making highly efficient plastic OLED device.


Wang, Z. B. et. al. (2011). Unlocking the full potential of organic light-emitting diodes on flexible plastic. Nature Photonics, doi:10.1038/nphoton.2011.259

Creating the Digital Displays of Tomorrow from U of T Engineering on Vimeo.


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