Light-Emitting Element
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Abstract
Provided is a light-emitting element with high external quantum efficiency and a low drive voltage. The light-emitting element includes a light-emitting layer which contains a phosphorescent compound and a material exhibiting thermally activated delayed fluorescence between a pair of electrodes, wherein a peak of a fluorescence spectrum and/or a peak of a phosphorescence spectrum of the material exhibiting thermally activated delayed fluorescence overlap(s) with a lowest-energy-side absorption band in an absorption spectrum of the phosphorescent compound, and wherein the phosphorescent compound exhibits phosphorescence in the light-emitting layer by voltage application between the pair of electrodes.
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Citations
19 Claims
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1. (canceled)
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2. A light-emitting element comprising:
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a first electrode and a second electrode; a light-emitting layer between the first electrode and the second electrode; a hole-transport layer between the light-emitting layer and the first electrode; and an electron-transport layer between the light-emitting layer and the second electrode, wherein the light-emitting layer comprises a phosphorescent compound and a thermally activated delayed fluorescence material. - View Dependent Claims (3, 4, 5, 6)
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7. A light-emitting element comprising:
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a first electrode and a second electrode; a light-emitting layer between the first electrode and the second electrode; a first layer between the light-emitting layer and the second electrode; a second layer between the first layer and the second electrode; and a third layer between the second layer and the second electrode, wherein the first layer includes a material with a high electron-injection property, wherein the second layer includes a material with a high electron-transport property, wherein the third layer includes a material with a high hole-transport property and an acceptor material, and wherein the light-emitting layer comprises a phosphorescent compound and a thermally activated delayed fluorescence material. - View Dependent Claims (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; a first light-emitting layer and a second light-emitting layer between the first electrode and the second electrode; and an intermediate layer between the first light-emitting layer and the second light-emitting layer, wherein the first light-emitting layer comprises a first phosphorescent compound and a first thermally activated delayed fluorescence material, and wherein the second light-emitting layer comprises a second phosphorescent compound and a second thermally activated delayed fluorescence material. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification