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US 6,605,823 B1Granted
Electroluminescent devices with electrode protection
AssigneeCambridge Display Technology Limited
InventorsKarl Pichler, Carl Towns
Life of this patent
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Abstract
A method of manufacturing an electroluminescent device which has an anode (4) and a cathode (10) and arranged between the anode (4) and the cathode (10) a light emissive layer (8), also includes an anode protection layer (6) which protects the anode (10) against the effects of converting a precursor polymer to a semiconductive conjugated polymer which constitutes the light emissive layer (8). This has been found to increase the brightness and half-life of devices.
Claims4
An electroluminescent device comprising:
- an anode formed of a positive charge carrier injecting material;
- a layer of polyethylene dioxythiophene (PEDT) polystyrene sulphonate (PSS) on the anode, the molar ratio of PSS to PEDT being greater than 1.2:1;
- a light emissive layer formed of a semiconductive conjugated polymer;
- and;
- a cathode formed of a negative charge carrier injecting material.
2 more elements
Dependencies are inferred from the claim text.