EL element using polythiophene
First Claim
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1. An electroluminescent element comprising at least one layer comprising at least one member selected from a thiophene polymer comprising a structural unit of the following formula (1):
- ##STR6## wherein each of R1 and R2, which may be identical or different, is a hydrogen atom, an aromatic hydrocarbon group or an aliphatic hydrocarbon group, and a thiophene copolymer comprising a structural unit of formula (1) and a structural unit of the following formula (2);
##STR7## wherein each of R3 and R4, which may be identical or different, is a hydrogen atom, an aromatic hydrocarbon group or an aliphatic hydrocarbon group, or R3 and R4 taken together may form a benzene ring,the polymer and the copolymer having an average degree of polymerization of 4 to 100 and being terminated with a hydrogen or halogen atom, andsaid at least one layer is formed by vacuum evaporation of said thiophene polymer or copolymer.
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Abstract
An electroluminescent element includes an organic compound layer formed of a thiophene polymer as a light emitting layer or a hole injection transport layer. The element emits light at high luminance and is reliable.
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Citations
18 Claims
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1. An electroluminescent element comprising at least one layer comprising at least one member selected from a thiophene polymer comprising a structural unit of the following formula (1):
- ##STR6## wherein each of R1 and R2, which may be identical or different, is a hydrogen atom, an aromatic hydrocarbon group or an aliphatic hydrocarbon group, and a thiophene copolymer comprising a structural unit of formula (1) and a structural unit of the following formula (2);
##STR7## wherein each of R3 and R4, which may be identical or different, is a hydrogen atom, an aromatic hydrocarbon group or an aliphatic hydrocarbon group, or R3 and R4 taken together may form a benzene ring,the polymer and the copolymer having an average degree of polymerization of 4 to 100 and being terminated with a hydrogen or halogen atom, and said at least one layer is formed by vacuum evaporation of said thiophene polymer or copolymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 16, 17, 18)
- ##STR6## wherein each of R1 and R2, which may be identical or different, is a hydrogen atom, an aromatic hydrocarbon group or an aliphatic hydrocarbon group, and a thiophene copolymer comprising a structural unit of formula (1) and a structural unit of the following formula (2);
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9. An electroluminescent element comprising an anode, a first hole injection transport layer, a second hole injection transport layer, a light emitting layer and a cathode in this order,
said first hole injection transport layer comprising at least one thiophene polymer of the following formula (3): - ##STR9## wherein each of R3 and R4, which may be identical or different, is a hydrogen atom, an aromatic hydrocarbon group or an aliphatic hydrocarbon group, or R3 and R4 taken together may form a benzene ring,
each of X1 and X2, which may be identical or different, is a hydrogen or halogen atom, letter n is a number from 4 to 100, and said layer comprising at least one thiophene polymer is formed by vacuum evaporation of said polymer. - View Dependent Claims (10)
- ##STR9## wherein each of R3 and R4, which may be identical or different, is a hydrogen atom, an aromatic hydrocarbon group or an aliphatic hydrocarbon group, or R3 and R4 taken together may form a benzene ring,
Specification