Patent ID: 7528003

Claim:
A method to improve operational efficiency of an optoelectronic device, the optoelectronic device comprising a first electrode, a second electrode and an organic optoelectronic sub-structure disposed between the first and the second electrodes, wherein the efficiency of the optoelectronic device is at least partially based on an electron transport process in the optoelectronic sub-structure, said method comprising: providing an inorganic layer between the organic optoelectronic sub-structure and the second electrode, wherein the inorganic layer comprises at least a layer substantially made of LiMn 2 O 4 , wherein the optoelectronic device comprises a light emitting device and the optoelectronic sub-structure comprises an emissive section, an electron transport section for providing electrons and a hole transport section for providing holes so that at least some of the provided electrons and holes combine in the emissive section to produce electromagnetic radiation, and wherein the first electrode comprises an anode adjacent to the hole transport section, the second electrode comprises a cathode adjacent to the election transport section, and the inorganic layer is disposed between the electron transport section and the cathode.