Self-light-emissive display device
AssigneeSharp Kabushiki Kaisha
InventorsYuto Tsukamoto, Katsuhiro Kikuchi, Hideki Uchida, Eiji Koike, Satoshi Inoue, Masanori Ohara, Kazuki Matsunaga
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Abstract
The organic EL element (10) at least includes, between a first electrode (2) and a second electrode (4), at least one layer of an exciton generating layer (33) which contains at least one type of TADF material as a host material and at least one layer of a fluorescent emission layer (34) which contains at least one type of fluorescent emission material.
Claims13
A self-light-emissive display device comprising, in sequence:
- an anode;
- at least one layer of a fluorescent emission layer containing at least one type of fluorescent emission material;
- at least one layer of an exciton generating layer containing at least one type of thermally activated delayed fluorescent material as a host material;
- and
- a cathode, wherein
- a highest occupied molecular orbital (HOMO) level of the thermally activated delayed fluorescent material in the exciton generating layer is higher than a HOMO level of the fluorescent emission material of the fluorescent emission layer, and
- a lowest unoccupied molecular orbital (LUMO) level of the thermally activated delayed fluorescent material in the exciton generating layer is lower than a LUMO level of the fluorescent emission material in the fluorescent emission layer.
A self-light-emissive display device comprising, in sequence:
- an anode;
- at least one layer of a fluorescent emission layer containing at least one type of fluorescent emission material;
- at least one layer of an exciton generating layer containing at least one type of thermally activated delayed fluorescent material as a host material;
- and
- a cathode, wherein:
- the exciton generating layer contains a material different from the thermally activated delayed fluorescent material, and
- an excited singlet level and an excited triplet level of each of all materials which are contained in the exciton generating layer and are different from the thermally activated delayed fluorescent material are (i) higher than respective excited singlet level and excited triplet level of the fluorescent emission material and (ii) higher than respective excited singlet level and excited triplet level of the thermally activated delayed fluorescent material in the exciton generating layer.
A self-light-emissive display device comprising, in sequence:
- an anode;
- at least one layer of a fluorescent emission layer containing at least one type of fluorescent emission material;
- at least one layer of an exciton generating layer containing at least one type of thermally activated delayed fluorescent material as a host material;
- and
- a cathode, wherein:
- the fluorescent emission layer contains a material different from the fluorescent emission material, and
- an excited singlet level and an excited triplet level of each of all materials other than the fluorescent emission material in the fluorescent emission layer are (i) higher than respective excited singlet level and excited triplet level of the fluorescent emission material and (ii) higher than respective excited singlet level and excited triplet level of the thermally activated delayed fluorescent material in the exciton generating layer.
Dependencies are inferred from the claim text.