Light-Emitting Device Inorganic Electrode Hole Injection

The patent employs composite electrode structures combining organic and inorganic materials. Specifically, the first electrode uses an organic material (e.g., ITO, IZO) as a base and forms an inorganic compound layer (oxides, nitrides, or carbides of W, Mo, Ga, Ni, Cu, Zn, or Ti) on its surface. This composite approach leverages the ease of manufacturing organic electrodes while gaining the superior stability and lifespan of inorganic materials at the critical interface with the hole transport layer.

The patent applies local quality by concentrating the complexity enhancement at the critical electrode-hole transport layer interface rather than throughout the entire device. The inorganic compound layer is specifically positioned at this interface to provide localized improvement in hole injection efficiency and interfacial stability, while the rest of the device structure remains relatively simple and conventional.

The patent changes the material parameters at the electrode interface by introducing inorganic compounds with specific properties (high work function, good hole injection capability). This parameter change in the interface material composition enables lower and more stable driving voltage over the device lifetime, while the overall manufacturing process remains compatible with conventional techniques to control costs.