Realizing both improved luminance and stability in organic light-emitting devices based on a solution-processed inter-layer composed of MoOX and Au nanoparticles mixture

• Solution-processed Au nanoparticles (NPs):MoOX was used as an inter-layer in OLEDs.
• The interface properties and good device stability were investigated.
• The improved electrical properties were achieved due to modification of interface.
• Localized surface plasmon induced efficiency enhancement was realized due to Au NPs.

We report on the solution-processed mixture of Au nanoparticles (NPs) and MoOX as an inter-layer in organic light-emitting devices (OLEDs), leading to the enhanced light emission and good stability. An impressive enhancement in current efficiency and power efficiency is achieved up to 70% and 100%, respectively. A systematic study to the effect of the Au NPs:MoOX inter-layer on OLEDs demonstrates that the improved electrical properties is mainly ascribed to the enhanced hole injection due to the high work function of MoOX and the good conductivity of Au NPs, and the enhanced optical properties is mainly attributed to the localized surface plasmon induced by Au NPs, which makes a great contribution to the improved efficiency. Besides, Au NPs:MoOX inter-layer also behaves superior to the frequently-used polyethylene dioxythiophene:polystyrene sulfonate (PEDOT:PSS) in device stability. The decay ratio for Au NPs:MoOX based device is 60% after 80 h, while it is nearly dying out for the device with PEDOT:PSS inter-layer.

Figure optionsDownload as PowerPoint slide