Light-Emitting Element, Light-Emitting Device, Electronic Device, Lighting Device, and Organic Compound
First Claim
1. A light-emitting element comprising:
- an EL layer between an anode and a cathode,wherein the EL layer includes a light-emitting layer,wherein the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance,wherein a combination of the first organic compound and the second organic compound forms an exciplex,wherein a HOMO level of the first organic compound is lower than a HOMO level of the second organic compound, andwherein a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.
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Accused Products
Abstract
To provide a light-emitting element with an improved reliability, a light-emitting element with a high current efficiency (or a high quantum efficiency), and a novel dibenzo[f,h]quinoxaline derivative that is favorably used in a light-emitting element which is one embodiment of the present invention. A light-emitting element includes an EL layer between an anode and a cathode. The EL layer includes a light-emitting layer; the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance; the combination of the first organic compound and the second organic compound forms an exciplex; the HOMO level of the first organic compound is lower than the HOMO level of the second organic compound; and a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.
31 Citations
24 Claims
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1. A light-emitting element comprising:
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an EL layer between an anode and a cathode, wherein the EL layer includes a light-emitting layer, wherein the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance, wherein a combination of the first organic compound and the second organic compound forms an exciplex, wherein a HOMO level of the first organic compound is lower than a HOMO level of the second organic compound, and wherein a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV. - 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 EL layer between an anode and a cathode, wherein the EL layer includes a light-emitting layer, wherein the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance, wherein a combination of the first organic compound and the second organic compound forms an exciplex, wherein the first organic compound includes a 6-membered nitrogen-containing heteroaromatic ring and a bicarbazole skeleton and does not include a triarylamine skeleton, and wherein the second organic compound includes a triarylamine skeleton. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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- 17. An organic compound represented by a general formula (G0),
Specification