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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 organic chemistry, organic semiconductor devices, and luminescent compositions, etc., can solve the problems of poor electron-accepting properties, hinder the efficient light-emitting of light-emitting elements, and difficulty in excitation by direct carrier recombination, etc., to achieve high reliability, low power consumption, and high emission efficiency

Inactive Publication Date: 2017-03-30
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a light-emitting element that has high emission efficiency and contains a phosphorescent material. It also has low power consumption, high reliability, and is novel and displayable. The light-emitting element includes a host material that can efficiently excite the phosphorescent material.

Problems solved by technology

Although the pyridine skeleton and the nitrogen-containing five-membered heterocyclic skeleton have high triplet excitation energy, they have poor electron-accepting property.
Thus, excitation by direct carrier recombination is sometimes difficult, which can hinder efficient light emission of a light-emitting element.

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

Experimental program
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embodiment 1

[0112]In this embodiment, a light-emitting element of one embodiment of the present invention will be described below with reference to FIGS. 1A and 1B, FIGS. 2A and 2B, FIGS. 3A and 3B, and FIGS. 4A and 4B.

Structure Example 1 of Light-Emitting Element

[0113]First, a structure of the light-emitting element of one embodiment of the present invention will be described below with reference to FIGS. 1A and 1B.

[0114]FIG. 1A is a schematic cross-sectional view of a light-emitting element 150 of one embodiment of the present invention.

[0115]The light-emitting element 150 includes a pair of electrodes (an electrode 101 and an electrode 102) and an EL layer 100 between the pair of electrodes. The EL layer 100 includes at least a light-emitting layer 130.

[0116]The EL layer 100 illustrated in FIG. 1A includes functional layers such as a hole-injection layer 111, a hole-transport layer 112, an electron-transport layer 118, and an electron-injection layer 119 in addition to the light-emitting lay...

embodiment 2

[0320]In this embodiment, a light-emitting element having a structure different from that described in Embodiment 1 and light emission mechanisms of the light-emitting element are described below with reference to FIGS. 5A to 5C and FIGS. 6A to 6C. In FIG. 5A and FIG. 6A, a portion having a function similar to that in FIG. 1A is represented by the same hatch pattern as in FIG. 1A and not especially denoted by a reference numeral in some cases. In addition, common reference numerals are used for portions having similar functions, and a detailed description of the portions is omitted in some cases.

Structure Example 1 of Light-Emitting Element

[0321]FIG. 5A is a schematic cross-sectional view of a light-emitting element 250.

[0322]The light-emitting element 250 illustrated in FIG. 5A includes a plurality of light-emitting units (a light-emitting unit 106 and a light-emitting unit 108 in FIG. 5A) between a pair of electrodes (the electrode 101 and the electrode 102). One of light-emitting...

embodiment 3

[0410]In this embodiment, examples of light-emitting elements having structures different from those described in Embodiments 1 and 2 are described below with reference to FIGS. 7A and 7B, FIGS. 8A and 8B, FIGS. 9A to 9C, and FIGS. 10A to 10C.

Structure Example 1 of Light-Emitting Element

[0411]FIGS. 7A and 7B are cross-sectional views each illustrating a light-emitting element of one embodiment of the present invention. In FIGS. 7A and 7B, a portion having a function similar to that in FIG. 1A is represented by the same hatch pattern as in FIG. 1A and not especially denoted by a reference numeral in some cases. In addition, common reference numerals are used for portions having similar functions, and a detailed description of the portions is omitted in some cases.

[0412]Light-emitting elements 260a and 260b in FIGS. 7A and 7B may have a bottom-emission structure in which light is extracted through the substrate 200 or may have a top-emission structure in which light emitted from the l...

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Abstract

To provide a light-emitting element with high emission efficiency and low driving voltage. The light-emitting element includes a guest material and a host material. A LUMO level of the guest material is lower than a LUMO level of the host material. An energy difference between the LUMO level and a HOMO level of the guest material is larger than an energy difference between the LUMO level and a HOMO level of the host material. The guest material has a function of converting triplet excitation energy into light emission. An energy difference between the LUMO level of the guest material and the HOMO level of the host material is larger than or equal to energy of light emission of the guest material.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]One embodiment of the present invention relates to a light-emitting element, a display device including the light-emitting element, an electronic device including the light-emitting element, and a lighting device including the light-emitting element.[0003]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. In addition, one embodiment of the present invention relates to a process, a machine, manufacture, or a composition of matter. 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 storage device, a memory device, a metho...

Claims

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Application Information

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IPC IPC(8): H01L51/50C09K11/02C07D403/12C07D241/38C07D405/10C09K11/06H01L51/00
CPCH01L51/5004C09K2211/1088C09K11/06C09K11/02H01L51/0085H01L51/006H01L51/0061C07D241/38C07D405/10C07D403/12H01L2251/5376H01L2251/552C09K2211/1007C09K2211/1029C09K2211/185H01L51/0052H01L51/0072H01L51/0073C09K2211/1011C09K2211/1014C09K2211/1022C09K2211/1044H01L51/5016H10K59/00H10K85/633H10K85/6572H10K85/6574H10K50/11H10K2101/40Y02P20/582C09K2211/1033C09K2211/1048C09K2211/1051C09K2211/1059C09K2211/1092C09K2211/188H10K59/35H10K50/131H10K2101/10H10K2101/90H10K2101/30H10K59/38H10K59/40H10K59/1213H10K85/342H10K50/12H10K85/636H10K85/615H10K2101/27
Inventor SEO, SATOSHIWATABE, TAKEYOSHIMITSUMORI, SATOMI
Owner SEMICON ENERGY LAB CO LTD
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