Inverted organic light-emitting diodes (IOLEDs) on plastic substrates have great potential application in flexible active-matrix displays. High energy consumption, instability and poor electron injection are key issues limiting the commercialization of flexible IOLEDs. Here, we have systematically investigated the electrooptical properties of molybdenum disulfide (MoS) and applied it in developing highly efficient and stable blue fluorescent IOLEDs. We have demonstrated that MoS-based IOLEDs can significantly improve electron-injecting capacity. For the MoS-based device on plastic substrates, we have achieved a very high external quantum efficiency of 7.3% at the luminance of 9141 cd m, which is the highest among the flexible blue fluorescent IOLEDs reported. Also, an approximately 1.8-fold improvement in power efficiency was obtained compared to glass-based IOLEDs. We attributed the enhanced performance of flexible IOLEDs to MoS nanopillar arrays due to their light extraction effect. The van der Waals force played an important role in the formation of MoS nanopillar arrays by thermal evaporation. Notably, MoS-based flexible IOLEDs exhibit an intriguing efficiency roll-up, that is, the current efficiency increases slightly from 14.0 to 14.6 cd A with the luminance increasing from 100 to 5000 cd m. In addition, we observed that the initial brightness of 500 cd m can be maintained at 97% after bending for 500 cycles, demonstrating the excellent mechanical stability of flexible IOLEDs. Furthermore, we have successfully fabricated a transparent, flexible IOLED with low efficiency roll-off at high current density.
Emerging organic resistive switching memory (ORSM) devices in which active organic materials possess at least two stable resistance states have attracted considerable attention for their intriguing nonvolatile memory properties. Here,...
This paper demonstrates a hybrid transparent electrode composed of a solution-processed silver-nanowire (AgNW) film coated by zinc oxide nanoparticles (ZnO-NPs) acting as a modified buffer layer. The effect of the ZnO-NPs' coating ratio on the performances of indium tin oxide (ITO)-free organic solar cells (OSCs) has been systematically investigated. The optimized ITO-free OSCs achieved a power conversion efficiency (PCE) of 2.85%, while flexible OSCs using the AgNW/ZnO-NP composite transparent electrode grown on a polyethylene terephthalate (PET) substrate showed a PCE of 2.2%.
In this work, we investigated the light-soaking effect in inverted polymer solar cells (PSCs) employing ZnO as an electron extraction layer (EEL) and demonstrated highly efficient light-soaking-free PSCs with a LiF modified ZnO (ZnO:LiF) EEL.
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