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US 7,843,128 B2Granted
Organic electroluminescent element
AssigneeKabushiki Kaisha Toshiba
InventorsHideki Ookawa, Junichi Tonotani
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Abstract
Disclosed is an organic electroluminescent element, comprising an anode and a cathode, an organic light-emitting layer interposed between the anode and the cathode, and an organic hole transfer layer containing a polymer type organic hole transfer material having a metal oxide of a semiconductor material or a conductive material added thereto.
Claims11
An organic electroluminescent element, comprising:
- an anode and a cathode;
- an organic light-emitting layer interposed between the anode and the cathode;
- and an organic layer interposed between the anode and the organic light emitting, the organic layer comprising a polymer type organic hole transfer material and a metal oxide of a conductive material added to the hole transfer material,
- wherein the polymer type organic hole transfer material is poly (ethylenedioxy) thiophene doped with polystyrenesulphonic acid or a salt thereof (PSS), and
- the metal oxide is at least one oxide selected from the group consisting of MoOx, and VOx, and the at least one oxide enters between the polymer chains of the poly (ethylenedioxy) thiophene:PSS so as to suppress the separation of a sulfur component from the PSS, thereby suppressing the diffusion of the sulfur component into the organic light-emitting layer.
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A method of manufacturing an organic electroluminescent element, comprising:
- forming an anode on the surface of a substrate;
- preparing a water-soluble PEDOT:PSS consisting of poly(3,4-ethylenedioxy) thiophene doped with polystyrenesulphonic acid or a salt thereof;
- mixing the water-soluble PEDOT:PSS with a water-soluble MoOx or a water-soluble VOx in the presence of water to prepare a mixed aqueous solution;
- coating the mixed aqueous solution on the surface of the anode to form an organic layer;
- forming an organic light-emitting layer on the surface of the organic layer;
- and
- forming a cathode on the organic light-emitting layer.
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Dependencies are inferred from the claim text.