Researchers have developed flexible thin-film OLEDs that exhibit high efficiencies at green wavelengths without the use of a high-refractive-index substrate.
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Leo, K. Efficient and flexible solution. Nature Photon 5, 716–718 (2011). https://doi.org/10.1038/nphoton.2011.288
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DOI: https://doi.org/10.1038/nphoton.2011.288
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