LIGHT-EMITTING ELEMENT, DISPLAY DEVICE, ELECTRONIC DEVICE, AND LIGHTING DEVICE
First Claim
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1. A light-emitting element comprising:
- a pair of electrodes; and
a light-emitting layer between the pair of electrodes,wherein the light-emitting layer comprises;
a fluorescent material as a guest material; and
a first organic compound and a second organic compound capable of forming an exciplex as a host material,wherein the fluorescent material comprises two substituents,wherein the two substituents comprise any one of branched alkyl groups each having 3 to 10 carbon atoms, cyclic hydrocarbon groups each having 3 to 10 carbon atoms, bridged cyclic hydrocarbon groups each having 3 to 10 carbon atoms, andwherein light emitted from the exciplex has a region overlapping with an absorption band of the fluorescent material on the lowest energy side.
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Abstract
A light-emitting element containing a fluorescent material and having high emission efficiency is provided. The light-emitting element contains the fluorescent material and a host material. The host material contains a first organic compound and a second organic compound. The first organic compound and the second organic compound can form an exciplex. The minimum value of a distance between centroids of the fluorescent material and at least one of the first organic compound and the second organic compound is 0.7 nm or more and 5 nm or less.
8 Citations
16 Claims
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1. A light-emitting element comprising:
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a pair of electrodes; and a light-emitting layer between the pair of electrodes, wherein the light-emitting layer comprises; a fluorescent material as a guest material; and a first organic compound and a second organic compound capable of forming an exciplex as a host material, wherein the fluorescent material comprises two substituents, wherein the two substituents comprise any one of branched alkyl groups each having 3 to 10 carbon atoms, cyclic hydrocarbon groups each having 3 to 10 carbon atoms, bridged cyclic hydrocarbon groups each having 3 to 10 carbon atoms, and wherein light emitted from the exciplex has a region overlapping with an absorption band of the fluorescent material on the lowest energy side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light-emitting element comprising:
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a pair of electrodes; and a light-emitting layer between the pair of electrodes, wherein the light-emitting layer comprises; a fluorescent material as a guest material; and a first organic compound and a second organic compound capable of forming an exciplex as a host material, wherein the fluorescent material has a fluorescence quantum yield of 70% or higher, and wherein the fluorescent material comprises two substituents, wherein the two substituents comprise any one of branched alkyl groups each having 3 to 10 carbon atoms, cyclic hydrocarbon groups each having 3 to 10 carbon atoms, bridged cyclic hydrocarbon groups each having 3 to 10 carbon atoms, and wherein light emitted from the exciplex has a region overlapping with an absorption band of the fluorescent material on the lowest energy side. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification