Organic light emitting device
AssigneesCambridge Display Technology Limited, Sumitomo Chemical Company, Limited
InventorsRobert Archer, Simon King
Life of this patent
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Abstract
An organic light-emitting device (100) comprising an anode (103); a cathode (109); a light-emitting layer (107) between the anode and the cathode; a first hole-transporting layer (105A) comprising a first conjugated hole-transporting polymer between the anode and the light-emitting layer; and a second hole-transporting layer (105B) comprising a second conjugated hole-transporting polymer between the first hole-transporting layer and the light-emitting layer, wherein a lowest excited state energy level of the first hole-transporting polymer is lower than the lowest excited state energy of the second hole-transporting polymer.
Claims15
An organic light-emitting device comprising an anode;
- a cathode;
- a light-emitting layer between the anode and the cathode;
- a first hole-transporting layer comprising a first conjugated hole-transporting polymer between the anode and the light-emitting layer;
- and a second hole-transporting layer comprising a second conjugated hole-transporting polymer between the first hole-transporting layer and the light-emitting layer, wherein a lowest excited state energy level of the first hole-transporting polymer is lower than the lowest excited state energy of the second hole-transporting polymer.
A method of forming an organic light-emitting device comprising an anode;
- a cathode;
- a light-emitting layer between the anode and the cathode;
- a first hole-transporting layer comprising a first conjugated hole-transporting polymer between the anode and the light-emitting layer;
- and a second hole-transporting layer comprising a second conjugated hole-transporting polymer between the first hole-transporting layer and the light-emitting layer, wherein a lowest excited state energy level of the first hole-transporting polymer is lower than the lowest excited state energy of the second hole-transporting polymer, comprising the steps of forming the first hole-transporting layer over the anode;
- forming the second hole-transporting layer over the first hole-transporting layer;
- forming the light-emitting layer over the second hole-transporting layer;
- and forming the cathode over the light-emitting layer.
Dependencies are inferred from the claim text.