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Organic Compound, Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

a technology of light-emitting elements and organic compounds, which is applied in the direction of organic chemistry, solid-state devices, thermoelectric devices, etc., can solve the problems of difficult synthesizing and practical use, and achieve the improvement of emission efficiency, emission characteristics, and reliability of light-emitting elements.

Inactive Publication Date: 2014-01-16
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new organic compound that can be used to improve the emission and reliability of light-emitting elements. The compound can be included in a light-emitting device, electronic device, or lighting device, making them more efficient and reliable. The technical effects of this patent are improved performance and a longer lifespan for light-emitting elements.

Problems solved by technology

Besides, the compound disclosed in Patent Document 1, in which an imidazophenanthridine ring and the 2-position of a dibenzofuran ring are bonded through an arylene group, is difficult to synthesize and put to practical use.
Moreover, Patent Document 1 does not attest or suggest that the compounds were actually synthesized or evaluated.

Method used

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  • Organic Compound, Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device
  • Organic Compound, Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device
  • Organic Compound, Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

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Experimental program
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embodiment 1

[0061]In this embodiment, a light-emitting element which includes a light-emitting layer between a cathode and an anode will be described with reference to FIG. 1.

[0062]As illustrated in FIG. 1, the light-emitting element in this embodiment includes an EL layer 102 between a first electrode 101 and a second electrode 103. The EL layer 102 includes at least a light-emitting layer 113 and also includes a hole-injection layer 111, a hole-transport layer 112, an electron-transport layer 114, an electron-injection layer 115, and the like. Note that in this embodiment, the first electrode 101 is used as an anode and the second electrode 103 is used as a cathode.

[0063]The light-emitting layer 113 contains an organic compound in which an imidazo[1,2-f]phenanthridine skeleton and a dibenzothiophene skeleton or a dibenzofuran skeleton are bonded through an arylene group.

[0064]The imidazo[1,2-f]phenanthridine skeleton with an electron-transport property and the dibenzothiophene skeleton or dib...

embodiment 2

[0113]In this embodiment, a light-emitting element in which the organic compound of one embodiment of the present invention, a light-emitting material which converts triplet excitation energy into light, and a hole-transport material are used for a light-emitting layer will be described with reference to FIGS. 2A and 2B.

[0114]A light-emitting element described in this embodiment includes an EL layer 210 between a first electrode 201 and a second electrode 203 as illustrated in FIG. 2A. Note that the EL layer 210 includes at least a light-emitting layer 223 and may further include a hole-injection layer 221, a hole-transport layer 222, an electron-transport layer 224, an electron-injection layer 225, and the like. The materials in Embodiment 1 which can be used for the hole-injection layer 111, the hole-transport layer 112, the electron-transport layer 114, and the electron-injection layer 115 can be respectively used for the hole-injection layer 221, the hole-transport layer 222, th...

embodiment 3

[0127]In this embodiment, as one embodiment of the present invention, a light-emitting element (hereinafter referred to as tandem light-emitting element) in which a charge-generation layer is provided between a plurality of EL layers will be described.

[0128]A light-emitting element described in this embodiment is a tandem light-emitting element including a plurality of EL layers (a first EL layer 311 and a second EL layer 312) between a first electrode 301 and a second electrode 303, as illustrated in FIG. 3A.

[0129]In this embodiment, the first electrode 301 functions as an anode, and the second electrode 303 functions as a cathode. Note that the first electrode 301 and the second electrode 303 can have structures similar to those described in Embodiment 2. Although the plurality of EL layers may have the structures similar to those described in Embodiment 1 or 2, any of the EL layers may have a structure similar to that described in Embodiment 1 or 2. In other words, the structures...

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Abstract

A novel organic compound with which the emission characteristics, emission efficiency, and reliability of a light-emitting element can be improved is provided. The organic compound has an imidazo[1,2-f]phenanthridine skeleton and a dibenzothiophene skeleton or a dibenzofuran skeleton bonded through an arylene group. The light-emitting element including the organic compound in a light-emitting layer shows high efficiency and low power consumption.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an organic compound and a light-emitting element including the organic compound. The present invention also relates to a light-emitting device, an electronic device, and a lighting device each including the light-emitting element.[0003]2. Description of the Related Art[0004]In recent years, research and development have been extensively conducted on light-emitting elements using electroluminescence (EL). In a basic structure of such a light-emitting element, a layer containing a light-emitting substance is interposed between a pair of electrodes. By applying voltage to this element, light can be emitted from the light-emitting substance.[0005]Such a light-emitting element is a self-luminous element and has advantages over liquid crystal displays, such as high visibility of pixels and no need of a backlight; thus, such a light-emitting element is thought to be suitable as a flat panel dis...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L51/00H10K99/00
CPCH01L51/0072H10K71/164H10K85/6576H10K85/342H10K85/6572H10K50/11H10K2101/10H10K2102/103
Inventor HIROSE, TOMOYAKADOMA, HIROSHISHITAGAKI, SATOKOSEO, SATOSHI
Owner SEMICON ENERGY LAB CO LTD
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