Light-emitting element, display device, electronic device, and lighting device

a technology of light-emitting elements and electronic devices, which is applied in the direction of solid-state devices, semiconductor devices, thermoelectric devices, etc., can solve the problems of difficult design of light-emitting materials that meet these two requirements, and achieve the effect of efficient energy transfer and increased emission efficiency of light-emitting elements

Inactive Publication Date: 2016-03-31
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]In order to increase emission efficiency of a light-emitting element containing a thermally activated delayed fluorescence substance and a material emitting fluorescence, efficient generation of a singlet excited state from a triplet excited state is important. In addition, efficient energy transfer from an excited state of the thermally activated delayed fluorescence substance to an excited state of the material emitting fluorescence is important.
[0015]An object of one embodiment of the present invention is to provide a light-emitting element having high emission efficiency which contains a fluorescent material as a light-emitting material. Another object of one embodiment of the present invention is to provide a light-emitting element with high reliability. Another object of one embodiment of the present invention is to provide a light-emitting element with high emission efficiency and high reliability. Another object of one embodiment of the present invention is to provide a novel light-emitting element. Another object of one embodiment of the present invention is to provide a novel light-emitting element with high emission efficiency and low power consumption.
[0025]One embodiment of the present invention makes it possible to provide a light-emitting element having high emission efficiency which contains a fluorescent material as a light-emitting material. One embodiment of the present invention makes it possible to provide a light-emitting element with high reliability. One embodiment of the present invention makes it possible to provide a light-emitting element with high emission efficiency and high reliability. One embodiment of the present invention makes it possible to provide a novel light-emitting element. One embodiment of the present invention makes it possible to provide a novel light-emitting element with high emission efficiency and low power consumption.

Problems solved by technology

It is, however, difficult to design a light-emitting material that meets these two.

Method used

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  • Light-emitting element, display device, electronic device, and lighting device
  • Light-emitting element, display device, electronic device, and lighting device
  • Light-emitting element, display device, electronic device, and lighting device

Examples

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embodiment 1

[0065]In this embodiment, a light-emitting element according to one embodiment of the present invention will be described with reference to FIGS. 1A and 1B and FIGS. 2A to 2C.

1. Structure Example of Light-Emitting Element

[0066]First, a structure of a light-emitting element of one embodiment of the present invention will be described with reference to FIGS. 1A and 1B.

[0067]A light-emitting element 150 includes an EL layer 100 between a pair of electrodes (an electrode 101 and an electrode 102). The EL layer 100 includes at least a light-emitting layer 120. Although the electrode 101 is an anode and the electrode 102 is a cathode in this embodiment, they can be interchanged for the structure of the light-emitting element 150.

[0068]The EL layer 100 in FIG. 1A includes a functional layer in addition to the light-emitting layer 120. The functional layer is composed of a hole-injection layer 111, a hole-transport layer 112, an electron-transport layer 118, and an electron-injection layer ...

embodiment 2

[0173]In this embodiment, a light-emitting element having a structure different from that described in Embodiment 1 and an emission mechanism of the light-emitting element will be described below with reference to FIGS. 3A and 3B.

[0174]FIG. 3A is a schematic cross-sectional view of a light-emitting element 450.

[0175]The light-emitting element 450 illustrated in FIG. 3A includes a plurality of light-emitting units (in FIG. 3A, a light-emitting unit 441 and a light-emitting unit 442) between a pair of electrodes (an electrode 401 and an electrode 402). One light-emitting unit has the same structure as the EL layer 100 illustrated in FIG. 1A. That is, the light-emitting element 150 in FIG. 1A includes one light-emitting unit, while the light-emitting element 450 includes the plurality of light-emitting units. Note that the electrode 401 functions as an anode and the electrode 402 functions as a cathode in the following description of the light-emitting element 450; however, the functio...

embodiment 3

[0217]In this embodiment, a light-emitting element having a structure different from those described in Embodiment 1 and Embodiment 2 will be described below with reference to FIGS. 4A and 4B.

[0218]FIG. 4A is a schematic cross-sectional view of a light-emitting element 452 of one embodiment of the present invention.

[0219]The light-emitting element 452 includes a plurality of light-emitting units (in FIG. 4A, a light-emitting unit 446 and a light-emitting unit 447) between an electrode 401 and an electrode 402. One light-emitting unit has the same structure as the EL layer 100 illustrated in FIG. 1A. That is, the light-emitting element 150 in FIG. 1A includes one light-emitting unit, while the light-emitting element 452 includes the plurality of light-emitting units. Note that the electrode 401 functions as an anode and the electrode 402 functions as a cathode in the following description of this embodiment; however, the functions may be interchanged in the light-emitting element 452...

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Abstract

Provided is a light-emitting element including a fluorescence-emitting material with high emission efficiency. The light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first organic compound, a second organic compound, and a guest material. The first organic compound has a function of emitting a thermally activated delayed fluorescence at room temperature. The guest material has a function of emitting fluorescence. A HOMO level of the first organic compound higher than or equal to a HOMO level of the second organic compound. A LUMO level of the first organic compound is lower than or equal to a LUMO level of the second organic compound.

Description

TECHNICAL FIELD[0001]One embodiment of the present invention relates to a light-emitting element in which a light-emitting layer capable of providing light emission by application of an electric field is provided between a pair of electrodes, and also relates to a display device, an electronic device, and a lighting device including the light-emitting element.[0002]Note that one embodiment of the present invention is not limited to the above technical field. The technical field of one embodiment of the invention disclosed in this specification and the like relates to an object, a method, or a manufacturing method. One embodiment of the present invention relates to a process, a machine, manufacture, or a composition of matter.[0003]Specifically, examples of the technical field of one embodiment of the present invention disclosed in this specification include a semiconductor device, a display device, a liquid crystal display device, a light-emitting device, a lighting device, a power ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L51/50H01L51/52
CPCH01L51/5016H01L51/5262H01L51/0067H01L51/0072H01L51/0074H01L51/0054H01L51/0058H01L51/0055H01L51/006H10K59/32H10K85/622H10K85/626H10K85/633H10K85/654H10K85/6576H10K85/6572H10K50/11H10K2101/40H10K50/121H10K50/19H10K2101/27H10K2101/90H10K2101/20H10K50/12H10K2101/10
Inventor SEO, SATOSHIOHSAWA, NOBUHARUWATABE, TAKEYOSHI
Owner SEMICON ENERGY LAB CO LTD
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