Light-emitting element including EL layer, electrode which has high reflectance and a high work function, display device, electronic device, and lighting device
First Claim
1. A light-emitting element comprising:
- a first electrode and a second electrode; and
an EL layer between the first electrode and the second electrode,wherein the first electrode comprises;
a conductive layer configured to reflect light;
a first transparent conductive layer in contact with the conductive layer, the first transparent conductive layer comprising a first oxide; and
a second transparent conductive layer in contact with the first transparent conductive layer, the second transparent conductive layer comprising a second oxide,wherein the first oxide comprises In, Ga, and Zn,wherein a content of Zn is higher than a content of Ga in the first oxide,wherein the second oxide comprises indium tin oxide,wherein the first transparent conductive layer is sandwiched between the conductive layer and the second transparent conductive layer,wherein a resistivity of the second transparent conductive layer is lower than a resistivity of the first transparent conductive layer, andwherein a thickness of the second transparent conductive layer is greater than or equal to a thickness of the first transparent conductive layer.
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Abstract
A light-emitting element including a first electrode, a second electrode, and an EL layer provided between the first and second electrodes is provided. The first electrode includes a conductive layer, a first transparent conductive layer in contact with the conductive layer, and a second transparent conductive layer in contact with the first transparent conductive layer. The first transparent conductive layer contains a first oxide. The second transparent conductive layer contains a second oxide. The conductive layer has a function of reflecting light. The first oxide contains In and M (M represents Al, Si, Ti, Ga, Y, Zr, La, Ce, Nd, or Hf). The second oxide contains In. The resistivity of the second transparent conductive layer is lower than that of the first transparent conductive layer. The thickness of the second transparent conductive layer is greater than or equal to that of the first transparent conductive layer.
169 Citations
24 Claims
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1. A light-emitting element comprising:
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a first electrode and a second electrode; and an EL layer between the first electrode and the second electrode, wherein the first electrode comprises; a conductive layer configured to reflect light; a first transparent conductive layer in contact with the conductive layer, the first transparent conductive layer comprising a first oxide; and a second transparent conductive layer in contact with the first transparent conductive layer, the second transparent conductive layer comprising a second oxide, wherein the first oxide comprises In, Ga, and Zn, wherein a content of Zn is higher than a content of Ga in the first oxide, wherein the second oxide comprises indium tin oxide, wherein the first transparent conductive layer is sandwiched between the conductive layer and the second transparent conductive layer, wherein a resistivity of the second transparent conductive layer is lower than a resistivity of the first transparent conductive layer, and wherein a thickness of the second transparent conductive layer is greater than or equal to a thickness of the first transparent conductive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A light-emitting element comprising:
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a first electrode and a second electrode; and an EL layer between the first electrode and the second electrode, wherein the first electrode comprises; a conductive layer configured to reflect light; a first transparent conductive layer in contact with the conductive layer, the first transparent conductive layer comprising a first oxide; and a second transparent conductive layer in contact with the first transparent conductive layer, the second transparent conductive layer comprising a second oxide, wherein the first oxide comprises In, Ga, and Zn, wherein a content of Zn is higher than a content of Ga in the first oxide, wherein the content of Ga is higher than a content of In in the first oxide, wherein the second oxide comprises indium tin oxide, wherein the first transparent conductive layer is sandwiched between the conductive layer and the second transparent conductive layer, wherein a resistivity of the second transparent conductive layer is lower than a resistivity of the first transparent conductive layer, and wherein a thickness of the second transparent conductive layer is greater than or equal to a thickness of the first transparent conductive layer. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A light-emitting element comprising:
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a first electrode and a second electrode; and an EL layer between the first electrode and the second electrode, wherein the first electrode comprises; a conductive layer configured to reflect light; a first transparent conductive layer in contact with the conductive layer, the first transparent conductive layer comprising a first oxide; a second transparent conductive layer in contact with the first transparent conductive layer, the second transparent conductive layer comprising a second oxide; a third transparent conductive layer in contact with the conductive layer, the third transparent conductive layer comprising the first oxide; and a fourth transparent conductive layer in contact with the third transparent conductive layer, the fourth transparent conductive layer comprising the second oxide, wherein the conductive layer comprises Al, wherein the first oxide comprises In, Ga, and Zn, wherein a content of Zn is higher than a content of Ga in the first oxide, wherein the content of Ga is higher than a content of In in the first oxide, wherein the second oxide comprises indium tin oxide, wherein the first transparent conductive layer is sandwiched between the conductive layer and the second transparent conductive layer, wherein the third transparent conductive layer is sandwiched between the conductive layer and the fourth transparent conductive layer, wherein a resistivity of the second transparent conductive layer is lower than a resistivity of the first transparent conductive layer, and wherein a thickness of the second transparent conductive layer is greater than or equal to a thickness of the first transparent conductive layer. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification