Abstract
We demonstrate the use of solution-processed molybdenum trioxide (MoO3) nanoparticle-decorated molybdenum disulfide (MoS2) nanosheets (MoS2/MoO3) as hole injection layer (HIL) in organic lighting diodes (OLEDs). The device performance is shown to be significantly improved by the introduction of such MoS2/MoO3 HIL without any post-ultraviolet-ozone treatment, and is shown to better the performance of devices fabricated using conventional poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) and MoO3 nanoparticle HILs. The MoS2/MoO3 nanosheets form a compact film, as smooth as PEDOT:PSS films and smoother than MoO3 nanoparticle films, when simply spin-coated on indium tin oxide substrates. The improvement in device efficiency can be attributed to the smooth surface of the nanostructured MoS2/MoO3 HIL and the excellent conductivity characteristics of the two-dimensional (2D) layered material (MoS2), which facilitate carrier transport in the device and reduce the sheet resistance. Moreover, the long-term stability of OLED devices that use such MoS2/MoO3 layers is shown to be improved dramatically compared with hygroscopic and acidic PEDOT:PSS-based devices.
Highlights
Organic light-emitting diodes (OLEDs) are becoming increasingly utilized in high-quality display and general lighting products, where their superior advantages such as self-luminescence, high color gamut, and low power consumption make OLEDs attractive for next-generation applications
The resulting performance and stability of an OLED device with such an integrated MoS2/MoO3 hole injection layer (HIL), without any post-UV-ozone treatment, was found to be much enhanced compared to devices fabricated with a bare UV-ozone indium tin oxide (ITO), and to better the performance and stability of devices prepared with conventional PEDOT:PSS (AI 4083) and MoO3 HILs
The improvement in performance suggests that OLED devices fabricated with a hybrid MoS2/MoO3 HIL could be a promising solution process material to replace widely used PEDOT:PSS- and MoO3-based devices
Summary
Organic light-emitting diodes (OLEDs) are becoming increasingly utilized in high-quality display and general lighting products, where their superior advantages such as self-luminescence, high color gamut, and low power consumption make OLEDs attractive for next-generation applications. The OLED lifetime issue is still considered to be the main obstacle to be overcome before the widespread utilization of OLEDs in commercial applications can be fully realized.[1,2,3]. The acidic and hygroscopic nature of the most commonly used PEDOT:PSS HIL can damage commonly used indium tin oxide (ITO) substrates, leading to rapid degradation of device performance.[14,15]. The resulting performance and stability of an OLED device with such an integrated MoS2/MoO3 HIL, without any post-UV-ozone treatment, was found to be much enhanced compared to devices fabricated with a bare UV-ozone ITO, and to better the performance and stability of devices prepared with conventional PEDOT:PSS (AI 4083) and MoO3 HILs
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