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Iridium complex, light-emitting element, display device, electronic device, and lighting device

a technology of iridium complexes and light-emitting elements, which is applied in the direction of organic chemistry, organic semiconductor devices, indium organic compounds, etc., can solve the problems of difficult efficient light emission and direct carrier recombination of carriers, and achieve high emission efficiency, low power consumption, and high reliability

Inactive Publication Date: 2016-12-22
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes an objective to provide a light-emitting element that contains a phosphorescent compound and has high emission efficiency, low power consumption, high reliability, and a novel compound. Overall, the objective is to create a light-emitting element with improved performance that can be used in various applications such as display devices.

Problems solved by technology

For this reason, in the iridium complex including a nitrogen-containing five-membered heterocyclic skeleton as a ligand, excitation of carriers by direct carrier recombination is difficult, which means that efficient light emission is difficult.

Method used

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  • Iridium complex, light-emitting element, display device, electronic device, and lighting device
  • Iridium complex, light-emitting element, display device, electronic device, and lighting device
  • Iridium complex, light-emitting element, display device, electronic device, and lighting device

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Experimental program
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embodiment 1

[0189]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 and FIGS. 2A and 2B.

[0190]First, a structure of the light-emitting element of one embodiment of the present invention will be described with reference to FIGS. 1A and 1B.

[0191]FIG. 1A is a schematic cross-sectional view of a light-emitting element 150 of one embodiment of the present invention.

[0192]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.

[0193]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 layer 130.

[0194]In this embodiment, although description is given assuming that the elec...

embodiment 2

[0314]In this embodiment, a novel compound that can suitably be used in a light-emitting element of one embodiment of the present invention is described below.

[0315]A compound of one embodiment of the present invention is an iridium complex including a nitrogen-containing five-membered heterocyclic skeleton as a ligand. The nitrogen-containing five-membered heterocyclic skeleton at least includes a substituent including a cyano group. The nitrogen-containing five-membered heterocyclic skeleton such as an imidazole skeleton or a triazole skeleton has a high triplet excitation energy level but has a lower electron-accepting property than a nitrogen-containing six-membered heterocyclic skeleton. Thus, the iridium complex including a nitrogen-containing five-membered heterocyclic skeleton as a ligand has a high LUMO level and to which electron carriers are not easily injected. However, since the iridium complex of one embodiment of the present invention at least includes a substituent i...

embodiment 3

[0366]In this embodiment, an example of a method for synthesizing the iridium complexes with the structures represented by General Formulae (G1), (G3), (G4), and (G7) is described. For synthesizing the iridium complexes, a variety of reactions can be used. For example, the iridium complexes represented by General Formulae (G1), (G3), (G4), and (G7) can be synthesized by synthesis reactions described below. Note that the method of synthesizing the iridium complex of one embodiment of the present invention is not limited to the following synthesis methods.

[0367]An example of a method for synthesizing the iridium complex with the structure represented by General Formula (G1) is described.

[0368]As shown in Synthesis Scheme (a) below, the iridium complex with the structure represented by General Formula (G1) can be obtained when a nitrogen-containing five-membered ring derivative represented by General Formula (G0) is mixed with an iridium metal compound containing a halogen (e.g., iridi...

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Abstract

Provided is a light-emitting element with high emission efficiency. The light-emitting element includes a first organic compound, a second organic compound, and a guest material. The LUMO level of the first organic compound is lower than that of the second organic compound, and the HOMO level of the first organic compound is lower than that of the second organic compound. The LUMO level of a guest material is higher than that of the first organic compound, and the HOMO level of the guest material is lower than that of the second organic compound. The guest material has a function of converting triplet excitation energy into light emission. The first organic compound and the second organic compound form an exciplex.

Description

TECHNICAL FIELD[0001]One embodiment of the present invention relates to a light-emitting element, or a display device, an electronic device, and a lighting device each 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. 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 method for driving any of them, and a method for manufacturing any of them.BACKGROUND ART[0003]In recent years, re...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L51/00C09K11/02C09K11/06H01L51/50C07F15/00H10K99/00
CPCH01L51/0085C09K2211/185C07F15/0033C09K11/06H01L51/0074H01L51/0072H01L51/0067C09K11/025H01L51/0052H01L51/0058H01L51/006H01L51/0061H01L2251/552H01L51/5056H01L51/5072H01L27/323H01L27/322H01L51/5237H01L27/3244H01L27/3211H01L2251/5353H01L51/5016C09K2211/1007C09K2211/1059H01L51/5004H10K59/00H10K85/342H10K50/11H10K2101/40H10K85/654H10K85/6576H10K85/6572H10K2101/10H10K2101/80H10K2101/90H10K2101/30H10K59/38H10K59/40H10K59/1213H10K50/121
Inventor SEO, SATOSHIWATABE, TAKEYOSHIINOUE, HIDEKOYAMADA, YUIMITSUMORI, SATOMITAKAHASHI, TATSUYOSHIHARA, TOMOKA
Owner SEMICON ENERGY LAB CO LTD
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