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.
Claims11
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;
- wherein a difference in HOMO level of the first and second hole-transporting polymers is no more than 0.3 eV.
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;
- wherein at least one of the first and second hole-transporting layers comprises a fluorescent or phosphorescent light-emitting material that emits light when the device is in use.
Dependencies are inferred from the claim text.