期刊
NANO LETTERS
卷 12, 期 1, 页码 424-428出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl203743p
关键词
Organic semiconductors; outcoupling; organic light-emitting diodes; optoelectronic devices; white OLEDs; top-emission
类别
资金
- German Bundesministerium fur Bildung und Forschung [13N11060]
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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