Patent ID: 8420157

Claim:
A process for the production of an electroluminescent device comprising a hole injecting electrode, an electron injecting electrode and at least one organic light emitting layer disposed between said hole injecting electrode and said electron injecting electrode, wherein a layered metal dichalcogenide layer is disposed between said hole injecting electrode and said light emitting layer, the chalcogen component of said layered metal dichalcogenide being selected from the group consisting of sulfur, selenium, and tellurium, the process comprising the step of depositing said layered metal dichalcogenide on said hole injecting electrode according to the following steps: (a) intercalating lithium atoms into said metal dichalcogenide; (b) adding water to the resulting intercalated material resulting in an exfoliation reaction so as to give single layers of said metal dichalcogenide suspended in the water; (c) adding a water immiscible solvent to the product of step (b) followed by agitation of the resulting mixture to give a thin film of the layered metal dichalcogenide at the solvent/water interface; and (d) wetting said hole injecting electrode and then dipping it into the solvent/water interface produced in step (c) above and allowing the thin film of the layered metal dichalcogenide to spread on the surface of said hole injecting electrode, thereby forming said layered metal dichalcogenide on said hole injecting electrode.