Light-emitting element, light-emitting device, and electronic device
First Claim
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1. A light-emitting element comprising:
- an anode;
a first layer over and in contact with the anode, the first layer comprising a first organic compound;
an organic compound layer over and in contact with the first layer;
a second layer over and in contact with the organic compound layer, the second layer comprising the first organic compound; and
a cathode over and in contact with the second layer,wherein;
the organic compound layer comprises a light-emitting region and a first region over and in contact with the light-emitting region;
the first region comprises the first organic compound and an electron-trapping substance; and
the light-emitting region comprises the first organic compound and a light-emitting substance.
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Abstract
Disclosed is a light-emitting element with a good carrier balance and manufacturing method thereof which does not require the formation of the heterostructure. The light-emitting element includes an organic compound film containing a first organic compound as the main component (base material) between an anode and a cathode, wherein the organic compound film is provided in contact with the anode and with the cathode. The first organic compound further includes a light-emitting region to which a light-emitting substance is added and includes a hole-transport region to which a hole-trapping substance is added and/or an electron-transport region to which an electron-trapping substance is added. The hole-transport region is located between the light-emitting region and the anode, and the electron-transport region is located between the light-emitting region and the cathode.
120 Citations
22 Claims
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1. A light-emitting element comprising:
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an anode; a first layer over and in contact with the anode, the first layer comprising a first organic compound; an organic compound layer over and in contact with the first layer; a second layer over and in contact with the organic compound layer, the second layer comprising the first organic compound; and a cathode over and in contact with the second layer, wherein; the organic compound layer comprises a light-emitting region and a first region over and in contact with the light-emitting region; the first region comprises the first organic compound and an electron-trapping substance; and the light-emitting region comprises the first organic compound and a light-emitting substance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light-emitting element comprising:
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an anode; a first layer over and in contact with the anode, the first layer comprising a first organic compound and an electron-donating substance; a second layer over and in contact with the first layer, the second layer comprising the first organic compound and an electron-accepting substance; an organic compound layer over and in contact with the second layer; a third layer over and in contact with the organic compound layer, the third layer comprising the first organic compound; and a cathode over and in contact with the third layer, wherein; the organic compound layer comprises a light-emitting region and a first region over and in contact with the light-emitting region; the first region comprises the first organic compound and an electron-trapping substance; and the light-emitting region comprises the first organic compound and a light-emitting substance. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A light-emitting element comprising:
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an anode; a first layer over and in contact with the anode, the first layer comprising a first organic compound; an organic compound layer over and in contact with the first layer; a second layer over and in contact with the organic compound layer, the second layer comprising the first organic compound and an electron-donating substance; a third layer over and in contact with the second layer, the third layer comprising the first organic compound and an electron-accepting substance; and a cathode over and in contact with the third layer, wherein; the organic compound layer comprises a light-emitting region and a first region over and in contact with the light-emitting region; the first region comprises the first organic compound and an electron-trapping substance; and the light-emitting region comprises the first organic compound and a light-emitting substance. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsSeo, Satoshi, Ohsawa, Nobuharu
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Primary Examiner(s)SEFER, AHMED N
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Application NumberUS14/149,164Publication NumberTime in Patent Office623 DaysField of Search257/209, 257/530, 438/597US Class Current1/1CPC Class CodesH10K 50/155 comprising dopantsH10K 50/165 comprising dopantsH10K 50/17 Carrier injection layersH10K 50/171 Electron injection layersH10K 50/805 ElectrodesH10K 85/342 comprising iridiumH10K 85/633 comprising polycyclic conde...H10K 85/636 comprising heteroaromatic h...H10K 85/6572 comprising only nitrogen in...
