Tailored Highly Transparent Composite Hole‐Injection Layer Consisting of Pedot:PSS and SiO2 Nanoparticles for Efficient Polymer Light‐Emitting Diodes

Nanocomposite organic/inorganic com­pounds are used to fabricate thick, conductive and highly transparent layers, which are used as hole injection and transport layers in OLEDs. The composite layers consist of SiO2-nanoparticles and the polymer PEDOT:PSS. The filling fraction of PEDOT:PSS in these thick layers is reduced to 3.9%. OLEDs comprising such composite layers show an increased outcoupling efficiency.