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Nano Lett. 2012 Jan 11;12(1):424-8. doi: 10.1021/nl203743p. Epub 2011 Dec 9.

Highly efficient white top-emitting organic light-emitting diodes comprising laminated microlens films.

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  • 1Institut für Angewandte Photophysik, TU Dresden, George-Bähr-Strasse 1, D-01069 Dresden, Germany.


White top-emitting organic light-emitting diodes (OLEDs) attract much attention, as they are optically independent from the substrate used. While monochrome top-emitting OLEDs can be designed easily to have high-emission efficiency, white light emission faces obstacles. The commonly used thin metal layers as top electrodes turn the device into a microresonator having detrimental narrow and angular dependent emission characteristics. Here we report on a novel concept to improve the color quality and efficiency of white top-emitting OLEDs. We laminate a refractive index-matched microlens film on the top-emitting device. The microlens film acts both as outcoupling-enhancing film and an integrating element, mixing the optical modes to a broadband spectrum.

© 2011 American Chemical Society

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