Method of making electroluminescent devices having varying electrical and/or optical properties

摘要

A method of forming an electroluminescent device, including the steps of forming a first charge carrier injecting layer for injecting charge carriers of a first polarity, forming an organic charge carrier transport layer over the first charge carrier injecting layer, the transport layer having an electronic and/or optical property which varies across the thickness of the transport layer, forming an organic light emissive layer over the transport layer, and forming a second charge carrier injecting layer over the light emissive layer for injecting charge carriers of a second polarity.