Journal
NANO LETTERS
Volume 12, Issue 1, Pages 424-428Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl203743p
Keywords
Organic semiconductors; outcoupling; organic light-emitting diodes; optoelectronic devices; white OLEDs; top-emission
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Funding
- German Bundesministerium fur Bildung und Forschung [13N11060]
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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.
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