Organic light-emitting device structure using metal cathode sputtering
AssigneeEastman Kodak Company
InventorsPranab K. Raychaudhuri, Joseph K. Madathil
Life of this patent
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Abstract
An OLED device, including a substrate, an anode formed of a conductive material disposed over the substrate, an emissive layer having an electroluminescent material provided over the anode layer, a buffer layer, provided over the emissive layer and including phthalocyanine or derivatives thereof, an electron injecting dopant source layer provided over the buffer layer and including a compound of an alkali metal or thermal decomposition products thereof; and a sputtered layer of a metal or metal alloy provided over the buffer layer and selected to function with the buffer layer to inject electrons into the emissive layer.
Claims27
An OLED device, comprising:
- a) a substrate;
- b) an anode formed of a conductive material disposed over the substrate;
- c) an emissive layer having an electroluminescent material provided over the anode layer;
- d) a buffer layer, provided over the emissive layer and including phthalocyanine or derivatives thereof;
- e) an electron injecting dopant source layer provided over the buffer layer and including a compound of an alkali metal or thermal decomposition products thereof;
- and
- f) a sputtered layer of a metal or metal alloy provided over the buffer layer and selected to function with the buffer layer to inject electrons into the emissive layer.
An OLED device, comprising:
- a) a substrate;
- b) an anode formed of a conductive material over the substrate;
- c) a hole-injection layer provided over the anode layer;
- d) a hole-transport layer provided over the hole-injection layer;
- e) an emissive layer having an electroluminescent material provided over the hole-transport layer;
- f) an electron-transport layer provided over the emissive layer;
- g) a buffer layer, provided over the electron-transport layer and including a phthalocyanine or derivatives thereof;
- h) an electron injecting dopant source layer provided over the buffer layer and including a compound of an alkali metal or thermal decomposition products thereof;
- and
- i) a sputtered layer of a metal or metal alloy provided over the buffer layer and selected to function with the buffer layer to cause electron injection into the electron-transport layer.
A method of making an OLED device, comprising the steps of:
- a) providing a substrate;
- b) forming an anode of a conductive material over the substrate;
- c) depositing an emissive layer having an electroluminescent material provided over the anode layer;
- d) forming a buffer layer, provided over the emissive layer and including a phthalocyanine or derivatives thereof;
- e) depositing an electron-injecting dopant source layer and including a compound of a alkali metal or thermal decomposition products thereof;
- f) sputtering a metal or metal alloy layer provided over the electron injecting dopant source layer layer;
- and
- g) heat-treating in an inert dry atmosphere.
Dependencies are inferred from the claim text.