We demonstrate high performance internal light outcoupling structures using nanoparicle-embedded hole transport layers (NE-HTLs) for solution-processed organic light-emitting diodes (OLEDs). The NE-HTLs show smoothly formed corrugated surfaces. The OLEDs with NE-HTLs show enhanced power efficiencies by a factor of 1.44 for polystyrene (PS) nanoparticles and 1.78 for SiO2 nanoparticles, respectively. These improvements are mainly attributed to the reduced total internal reflection at the interfaces of organic layers and transparent electrodes in devices by introducing NE-HTLs. Because the internal light outcoupling structures are prepared on top of the transparent electrode, a damage of organic layers and deterioration of the electrical and optical properties of transparent electrodes are not induced. In addition, the OLEDs with NE-HTLs show the angle-independent light outcoupling enhancement. It is expected that the NE-HTLs fabricated by the simple solution process can contribute to the development of efficient internal outcoupling structures for OLEDs.
Organic Electronics – Elsevier
Published: Mar 1, 2018
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