Optimization of Polymer Blue‐Light‐Emitting Devices by Introducing a Hole‐Injection Layer Doped with the Molecular Nanomagnet [Mn12O12(H2O)4(C6F5COO)16]

The performance of a blue-light-emitting polymer (LEP) device is improved by introducing a novel soluble hybrid hole-injection layer based on a polyarylamine (pTPD) doped with a large inorganic magnetic cluster (Mn12) used as oxidant. The efficiency of the devices at different luminances changes dramatically as the Mn12/pTPD ratio is increased from 0.005 to 0.05 (see figure).