Optical device comprising a charge transport layer of insoluble organic material and method for the production thereof

US8974917B2 · kind B2 · utility

Assignee

• Cambridge Display Technology Limited · GB

Inventors

• Nalinkumar Patel · Impington, GB
• Natasha Conway · Cambridge, GB
• Mark Leadbeater · Depden, GB
• Ilaria Grizzi · Cambridge, GB

Key dates

• Filing date: Dec 20, 2004
• Grant date: Mar 10, 2015
• Expiry date: Aug 2, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S428/917

Abstract

A method of forming an organic light emitting diode comprising the steps of: providing a substrate comprising a first electrode for injection of charge carriers of a first type; forming a charge transporting layer by depositing over the substrate a charge transporting material for transporting charge carriers of the first type, the charge transporting material being soluble in a solvent; treating the charge transporting layer to render it insoluble in the solvent; forming an electroluminescent layer by depositing onto the charge transporting layer a composition comprising the solvent, a phosphorescent material, and a host material; and depositing over the electroluminescent layer a second electrode for injection of charge carriers of a second type.