Organic electroluminescent devices incorporating uv-illuminated fluorocarbon layers
AssigneeCity University of Hong Kong
InventorsChun Sing LEE, Shuit-Tong LEE, Shi Wun TONG, Yeshayahu LIFSHITZ
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Abstract
A simple and efficient method of increasing conductivity of the fluorocarbon film is disclosed. By illuminating the fluorocarbon film under ultraviolet light (UV-CFx), the film conductivity can be increased by five orders of magnitude. Devices using such a UV-treated, conductive fluorocarbon film as a buffer layer give much better performance in terms of lower operational voltage and enhanced operational stability. The improved smoothness and lowered hole injection barrier height with UV-CFx are responsible for the enhanced performance of electroluminescent devices.
Claims19
An organic electroluminescent device comprising:
- a) a substrate formed of an electrically insulating material;
- b) a hole-injecting anode layer mounted on the substrate;
- c) a fluorocarbon film treated by illumination with ultra-violet light;
- d) an organic light-emitting structure formed over the fluorocarbon film;
- and
- e) an electron-injecting cathode formed by co-evaporating two conductive metals.
A method of forming an electroluminescent device comprising:
- a) depositing an anode layer on a substrate,
- b) depositing a fluorocarbon layer on the anode layer,
- c) exposing the fluorocarbon layer to ultra-violet light,
- d) forming an organic light-emitting structure over the fluorocarbon layer, and
- e) forming an electron-injecting cathode over the organic light-emitting structure.
Dependencies are inferred from the claim text.