Organic electroluminescence display panel and organic electroluminescence display device
First Claim
1. An organic EL display panel comprising:
- a substrate;
at least one first electrode on or in the substrate;
auxiliary wiring on or in the substrate at a distance from the first electrode;
a functional layer, including at least a light-emitting layer, above the first electrode;
a hole injection layer for injecting holes to the functional layer, the hole injection layer being between the first electrode and the functional layer; and
a second electrode above the functional layer, whereinthe hole injection layer and the second electrode are both disposed to be continuous above the first electrode and above the auxiliary wiring,the second electrode and the auxiliary wiring are electrically connected by the hole injection layer, andthe hole injection layer contains tungsten oxide and has, in an electronic state thereof, an occupied energy level in a range between 1.8 electron volts and 3.6 electron volts lower than a lowest energy level of a valence band of the hole injection layer in terms of a binding energy.
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Abstract
The present invention provides an organic EL display panel and an organic EL display apparatus that can be driven at a low voltage and that exhibit excellent light-emitting efficiency. Sequentially fixated on a substrate are: a first electrode; auxiliary wiring; a hole injection layer; a functional layer; and a second electrode. The hole injection layer and the second electrode are both formed to be continuous above the first electrode and above the auxiliary wiring. The second electrode and the auxiliary wiring are electrically connected by the hole injection layer. The hole injection layer contains tungsten oxide and at least 2 nm thick so as to have, in an electronic state thereof, an occupied energy level in a range between 1.8 eV and 3.6 eV lower than a lowest energy level of a valence band in terms of a binding energy.
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Citations
35 Claims
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1. An organic EL display panel comprising:
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a substrate; at least one first electrode on or in the substrate; auxiliary wiring on or in the substrate at a distance from the first electrode; a functional layer, including at least a light-emitting layer, above the first electrode; a hole injection layer for injecting holes to the functional layer, the hole injection layer being between the first electrode and the functional layer; and a second electrode above the functional layer, wherein the hole injection layer and the second electrode are both disposed to be continuous above the first electrode and above the auxiliary wiring, the second electrode and the auxiliary wiring are electrically connected by the hole injection layer, and the hole injection layer contains tungsten oxide and has, in an electronic state thereof, an occupied energy level in a range between 1.8 electron volts and 3.6 electron volts lower than a lowest energy level of a valence band of the hole injection layer in terms of a binding energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An organic EL display panel comprising:
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a substrate; at least one first electrode on or in the substrate; wiring on or in the substrate at a distance from the first electrode; an organic layer above the first electrode, the organic layer containing organic material; a tungsten oxide layer between the organic layer and the first electrode, the tungsten oxide layer containing tungsten oxide; and a second electrode above the organic layer, wherein the tungsten oxide layer and the second electrode are both disposed to be continuous above the first electrode and above the wiring, the second electrode and the wiring are electrically connected by the tungsten oxide layer, and the tungsten oxide layer has, in an electronic state thereof, an occupied energy level in a range between 1.8 electron volts and 3.6 electron volts lower than a lowest energy level of a valence band of the tungsten oxide layer in terms of the binding energy.
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32. A manufacturing method for an organic EL display panel, the manufacturing method comprising:
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a first step of forming a first electrode on or in a substrate; a second step of forming auxiliary wiring on or in the substrate at a distance from the first electrode; a third step of forming a hole injection layer to be continuous above the first electrode and above the auxiliary wiring; a fourth step of forming, above the first electrode, a functional layer including at least a light-emitting layer; and a fifth step of forming a second electrode to be continuous above the functional layer and above the hole injection layer formed above the auxiliary wiring, wherein the second electrode and the auxiliary wiring are electrically connected by the hole injection layer, and the hole injection layer contains tungsten oxide and has, in an electronic state thereof, an occupied energy level in a range between 1.8 electron volts and 3.6 electron volts lower than a lowest energy level of a valence band of the hole injection layer in terms of a binding energy. - View Dependent Claims (33, 34)
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35. A manufacturing method for an organic EL display panel, the manufacturing method comprising:
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a first step of forming a first electrode on or in a substrate; a second step of forming wiring on or in the substrate at a distance from the first electrode; a third step of foaming a tungsten oxide layer, containing tungsten oxide, to be continuous above the first electrode and above the wiring; a fourth step of forming an organic layer, containing organic material, above the first electrode; a fifth step of forming a second electrode to be continuous above the functional layer and above the tungsten oxide layer formed above the wiring, wherein the second electrode and the wiring are electrically connected by the tungsten oxide layer, and the tungsten oxide layer has, in an electronic state thereof, an occupied energy level in a range between 1.8 electron volts and 3.6 electron volts lower than a lowest energy level of a valence band of the tungsten oxide layer in terms of a binding energy.
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Specification