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Chang, H. W.,Kim, Y. H.,Lee, J.,Hofmann, S.,Lussem, B.,Muller-Meskamp, L.,Gather, M. C.,Leo, K.,Wu, C. C. Elsevier Science B.V., Amsterdam. 2014 Organic electronics Vol.15 No.5
In this work, we demonstrate color-stable, ITO-free white organic light-emitting diodes (WOLEDs) with enhanced efficiencies by combining the high-conductivity conducting polymer PEDOT:PSS as transparent electrode and a nanoparticle-based scattering layer (NPSL) as the effective optical out-coupling layer. In addition to efficiency enhancement, the NPSL is also beneficial to the stabilization of electroluminescent spectra/colors over viewing angles. Both the PEDOT:PSS and the NPSL can be fabricated by simple, low-temperature solution processing. The integration of both solution-processable transparent electrodes and light extraction structures into OLEDs is particularly attractive for applications since they simultaneously provide manufacturing, cost and efficiency advantages. (C) 2014 Elsevier B.V. All rights reserved.
Lee, J.,Cho, H.,Koh, T.W.,Hofmann, S.,Kim, Y.H.,Yun, C.,Schwab, T.,Reineke, S.,Lussem, B.,Lee, J.I.,Yoo, S.,Leo, K.,Gather, M.C. Elsevier Science 2013 Organic electronics Vol.14 No.10
We investigated the control of micro-cavity (MC) effects in organic light-emitting diodes (OLEDs) with the introduction of a striped thin metal layer between the indium tin oxide (ITO) layer and the hole transporting layer (HTL). With an enhanced MC effect obtained through the inserted metal layer, the forward emission of the OLED became stronger and the angular distribution became more forward-directed, leading to a current efficiency (CE) that was nearly 1.45times higher than that of the reference device without the inserted metal layer. The net CE of the OLEDs with a striped metal layer was found to be determined by the area-weighted average of the CE's of full-cavity-enhanced OLEDs and non-cavity OLEDs. It was also observed that the trade-off between resonance enhancement in efficiency and angle-dependent color stability, often found problematic in MC-based OLEDs, could be mitigated in a straight-forward manner by changing the relative portion of the metal-covered area.