Improved performances in organic and polymer light-emitting diodes using solution-processed vanadium pentoxide as a hole injection layer

Abstract

We report that a solution-processed vanadium pentoxide (V2O5) layer can be utilized as an effective and stable hole injection layer in organic light-emitting diodes and polymer light-emitting diodes instead of polyethylene dioxythiophene:polystyrenesulfonate (PEDOT:PSS). The organic light-emitting diode and polymer light-emitting diode with the V2O5 layer have driving voltages that are 2.2 and 0.3V lower for 1000cd/m2, respectively, than the devices with PEDOT:PSS. In addition, the devices with the V2O5 layer show improved operational stability compared with the devices with PEDOT:PSS. Therefore, a solution-processed V2O5 layer can be utilized as an effective and stable hole injection layer instead of PEDOT:PSS.