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feaTureS 20 EPN 42/4 Organic light-emitting diodes (OLEDs) are efficient large-area light sources facing their market entry.Still, the development of stable and more efficient blue emitters and the enhancement of light outcoupling remain challenges for further device improvements.Here, we review the working principles of OLEDs and highlight ongoing efforts to improve their efficiency.
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Brütting et al. (2011) studied this question.
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