Inorganic buffer structure for organic light-emitting diode devices
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 over the substrate, an emissive layer having an electroluminescent material provided over the anode layer, a buffer structure including at least two layers, a first buffer layer provided over the electron-transport layer and containing an alkaline halide and a second buffer layer provided over the first buffer layer and containing a metal or metal alloy and having a work function of between 2.0 to 4.0 eV; and a sputtered layer of a metal or metal alloy provided over the buffer structure.
Claims22
An OLED device, comprising:
- a) a substrate;
- b) an anode formed of a conductive material over the substrate;
- c) an emissive layer having an electroluminescent material provided over the anode layer;
- d) an electron-transport layer provided over the emissive layer;
- e) a buffer structure including at least two layers, a first buffer layer provided over the electron-transport layer and containing an alkaline halide and a second buffer layer provided over the first buffer layer and containing a metal or metal alloy and having a work function of between 2.0 to 4.0 eV;
- and
- f) a sputtered layer of a metal or metal alloy provided over the buffer structure.
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 structure including at least two layers, a first buffer layer provided over the electron-transport layer and containing an alkaline halide and a second buffer layer provided over the first buffer layer and containing a metal or metal alloy and having a work function of between 2.0 to 4.0 eV;
- and
- h) a sputtered layer of a metal or metal alloy provided over the buffer structure.
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 hole-injecting layer over the anode
- (d) an electron-transport layer provided over the emissive layer;
- (e) depositing an emissive layer having an electroluminescent material provided over the hole-injecting layer;
- (f) forming a buffer structure including at least two layers, a first buffer layer provided over the electron-transport layer and containing an alkaline halide and a second buffer layer provided over the first buffer layer and containing a metal or metal alloy and having a work function of between 2.0 to 4.0 eV;
- and
- (g) sputtering a metal or metal alloy layer provided over the buffer structure.
Dependencies are inferred from the claim text.