Light-emitting element, display device, and electronic appliance
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, said third layer including a light emitting material; and
a fourth layer between the second layer and the third layer, said fourth layer generating electrons.
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Accused Products
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
21 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, said third layer including a light emitting material; and
a fourth layer between the second layer and the third layer, said fourth layer generating electrons.
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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;
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. - View Dependent Claims (4, 6, 8, 10)
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3. 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;
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. - View Dependent Claims (5, 7, 9, 11)
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12. 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 fourth organic compound and a third material having electron-donating properties to the fourth organic compound. - View Dependent Claims (14, 16, 18, 20)
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13. 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 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. - View Dependent Claims (15, 17, 19, 21)
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Specification