Organic/polymer electroluminescent devices employing single-ion conductors
View Patent ↗The present invention relates to electroluminescent devices employing single-ion conductors as the materials for an electron- or hole-injecting layer. Preferred electroluminescent devices employ an electron- or hole-injecting layer made of single-ion conductors in a conventional electroluminescent device which comprises: a transparent substrate; a semitransparent electrode deposited on the transparent substrate; a hole-injecting layer positioned on the semitransparent electrode; an electroluminescent layer made of organic luminescent material, positioned on the hole-injecting layer; an electron-injecting layer positioned on the electroluminescent layer; and, a metal electrode deposited on the electron-injecting layer. The electroluminescent devices of the invention have excellent electroluminescent efficiency and low turn-on voltage, which make possible their application to the development of high efficiency electroluminescent devices.
1. An electroluminescent device comprising:
a substrate;
a first electrode deposited on the substrate;
a hole-injecting layer positioned on the first electrode, the hole-injecting layer comprising a polymeric compound and a movable anion, the polymeric compound having at least one block of [O—(CH 2 ) x ] y units and at least one non-movable cationic moiety, wherein x is an integer equal to or greater than two, wherein y is an integer equal to or greater than one;
an emissive layer comprising an organic electroluminescent material, positioned on the hole-injecting layer;
an electron-injecting layer positioned on the emissive layer, the electron-injecting layer comprising a polymeric compound and a movable cation, the polymeric compound having at least one block of [O—(CH 2 ) x′ ] y′ units and at least one non-movable anionic moiety, wherein x′ is an integer equal to or greater than two, wherein y′ is an integer equal to or greater than one; and
a second electrode deposited on the electron-injecting layer.
2. An electroluminescent device comprising:
a substrate;
a first electrode deposited on the substrate;
an electron-injecting layer positioned on the first electrode, the electron-injecting layer comprising a polymeric compound and a movable cation, the polymeric compound having at least one block of [O—(CH 2 ) x′ ] y′ units and at least one non-movable anionic moiety, wherein x′ is an integer equal to or greater than two, wherein y′ is an integer equal to or greater than one;
an emissive layer comprising an organic electroluminescent material, positioned on the electron-injecting layer;
a hole-injecting layer positioned on the emissive layer, the hole-injecting layer comprising a polymeric compound and a movable anion, the polymeric compound having at least one block of [O—(CH 2 ) x ] y units and at least one non-movable cationic moiety, wherein x is an integer equal to or greater than two, wherein y is an integer equal to or greater than one; and
a second electrode deposited on the hole-injecting layer.
3. An electroluminescent device comprising:
a substrate;
a first electrode deposited on the substrate;
a hole-injecting layer positioned on the first electrode, the hole-injecting layer comprising a polymeric compound and a movable anion, the polymeric compound having at least one block of [O—(CH 2 ) x ] y units and at least one non-movable cationic moiety, wherein x is an integer equal to or greater than two, wherein y is an integer equal to or greater than one;
an emissive layer comprising an organic electroluminescent material, positioned on the hole-injecting layer; and,
a second electrode deposited on the emissive layer.
4. The electroluminescent device of claim 3 , wherein the substrate comprises a material selected from the group consisting of glass, quartz, and polyethylene terephthalate.
5. The electroluminescent device of claim 3 , wherein the first electrode comprises a material selected from the group consisting of lead oxide, indium tin oxide, doped polyaniline, doped polypyrrole, doped polythiophene, and polyethylene dioxythiophene.
6. The electroluminescent device of claim 3 , wherein the emissive layer comprises a material selected from the group consisting of emissive conjugated polymer, emissive non-conjugated polymer, emissive monomeric or oligomeric material, poly(meta-methylacrylic acid), poly(styrene), and poly(9-vinylcarbazole).
7. The electroluminescent device of claim 6 , wherein the emissive conjugated polymer is selected from the group consisting of poly(p-phenylene vinylene), poly(thiophene), poly(p-phenylene), poly(fluorene), poly(arylenes), poly(arylene vinylene), polyquinoline, polypyrrole, polyaniline, polyacetylene, and derivatives thereof.
8. The electroluminescent device of claim 6 , wherein the emissive non-conjugated polymer is a polymer having non-conjugated main chains and side chains substituted with emissive functional groups.
9. The electroluminescent device of claim 6 , wherein the emissive monomeric or oligomeric material is selected from the group consisting of alumina quinone, rubrene, anthracene, perylene, coumarine 6, Nile red, aromatic diamine, N,N′-diphenyl-N,N′-bis-(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine), (3-(4-biphenyl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole), (dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4-H-pyran), and derivatives thereof.
10. The electroluminescent device of claim 3 , wherein the second electrode comprises a material selected from the group consisting of aluminum, magnesium, lithium, calcium, copper, silver, iron, platinum, indium, palladium, tungsten, zinc, gold, lead, and alloys thereof.
11. The electroluminescent device of claim 3 , wherein the polymeric compound is represented by one or more formulas selected from the group consisting of the formula (III) and formula (IV),
wherein EO represents ethylene oxide; NonEO represents non-ethylene oxide; PO represents propylene oxide; NonPO represents non-propylene oxide; A − represents an anion; C + represents a cation; m+n=1; and n represents a number more than 0 and less than 1.
12. The electroluminescent device of claim 3 , wherein the polymeric compound is represented by one or more formulas selected from the group consisting of the formula (I) and the formula (II),
wherein EO represents ethylene oxide; NonEO represents non-ethylene oxide; PO represents propylene oxide; NonPO represents non-propylene oxide; A − represents an anion; C + represents a cation; m+n=1; and n is a number more than 0 less than 1.
13. The electroluminescent device of claim 3 , wherein the polymeric compound comprises one or more segments selected from the group consisting of:
14. An electroluminescent device comprising:
a substrate;
a first electrode deposited on the substrate;
an emissive layer comprising an organic electroluminescent material, positioned on the first electrode;
a hole-injecting layer positioned on the emissive layer, the hole-injecting layer comprising a polymeric compound and a movable anion, the polymeric compound having at least one block of [O—(CH 2 ) x ] y units and at least one non-movable cationic moiety, wherein x is an integer equal to or greater than two, wherein y is an integer equal to or greater than one; and
a second electrode deposited on the hole-injecting layer.