Light-emitting element having hole generating layer
First Claim
1. A light-emitting element comprising:
- an anode and a cathode;
a first layer between the anode and the cathode, said first layer generating holes;
a second layer between the anode and the cathode, said second layer generating holes and contacting the cathode;
a third layer between the first layer and the second layer, wherein said third layer is a light emitting layer including a light emitting material; and
a fourth layer between the second layer and the third layer, said fourth layer generating electrons,wherein the second layer comprises a metal oxide.
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Abstract
The present invention provides a light-emitting element having a structure in which the drive voltage is comparatively low and a light-emitting element in which the increase in the drive voltage over time is small. Further, the present invention provides a display device in which the drive voltage and the increase in the drive voltage over time are small and which can resist long-term use. A layer in contact with an electrode in a light-emitting element is a layer containing a P-type semiconductor or a hole-generating layer such as an organic compound layer containing a material having electron-accepting properties. The light-emitting layer is sandwiched between the hole-generating layers, and an electron-generating layer is sandwiched between the light-emitting layer and the hole-generating layer on a cathode side.
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Citations
20 Claims
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1. A light-emitting element comprising:
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an anode and a cathode; a first layer between the anode and the cathode, said first layer generating holes; a second layer between the anode and the cathode, said second layer generating holes and contacting the cathode; a third layer between the first layer and the second layer, wherein said third layer is a light emitting layer including a light emitting material; and a fourth layer between the second layer and the third layer, said fourth layer generating electrons, wherein the second layer comprises a metal oxide.
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2. A light-emitting element comprising:
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an anode and a cathode; a first layer between the anode and the cathode, said first layer including a first P-type semiconductor material; a second layer between the anode and the cathode, said second layer including a second P-type semiconductor material and contacting the cathode; a third layer between the first layer and the second layer, wherein said third layer is a light emitting layer including a light emitting material; and a fourth layer between the second layer and the third layer, said fourth layer including an N-type semiconductor material, wherein the second P-type semiconductor material is a metal oxide. - View Dependent Claims (3, 4, 5, 6)
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7. A light-emitting element comprising:
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an anode and a cathode; a first layer between the anode and the cathode, said first layer including a P-type semiconductor material; a second layer between the anode and the cathode, said second layer including the P-type semiconductor material and contacting the cathode; a third layer between the first layer and the second layer, said third layer including a light emitting material; and a fourth layer between the second layer and the third layer, said fourth layer including an N-type semiconductor material, wherein the P-type semiconductor material is a metal oxide. - View Dependent Claims (8, 9, 10)
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11. A light-emitting element comprising:
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an anode and a cathode; a first layer between the anode and the cathode, said first layer including a first organic compound and a first material having electron-accepting properties to the first organic compound; a second layer between the anode and the cathode, said second layer including a second organic compound and a second material having electron-accepting properties to the second organic compound; a third layer between the first layer and the second layer, said third layer including a light emitting material; and a fourth layer between the second layer and the third layer, said fourth layer including a third organic compound and a third material having electron-donating properties to the third organic compound, wherein the second layer is in contact with the cathode. - View Dependent Claims (12, 13, 14, 15)
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16. A light-emitting element comprising:
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an anode and a cathode; a first layer between the anode and the cathode, said first layer including a first organic compound and a first material having electron-accepting properties to the first organic compound; a second layer between the anode and the cathode, said second layer including the first organic compound and the first material having electron-accepting properties to the first organic compound; a third layer between the first layer and the second layer, said third layer including a light emitting material; and a fourth layer between the second layer and the third layer, said fourth layer including a second organic compound and a second material having electron-donating properties to the second organic compound, wherein the second layer is in contact with the cathode. - View Dependent Claims (17, 18, 19, 20)
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Specification