Carbazole Derivative, and Light-Emitting Element, Light-Emitting Device, and Electronic Device Using Carbazole Derivative

a technology of carbazole and derivative, which is applied in the direction of discharge tube/lamp details, organic chemistry, discharge tube luminescnet screens, etc., can solve the problems of lowering the luminous efficiency of the light-emitting element and difficulty in obtaining this characteristic, and achieves low power consumption, high luminous efficiency, and low voltage

Inactive Publication Date: 2009-06-25
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Thus, it is an object of the present invention to provide a light-emitting element having high luminous efficiency by providing a novel carbazole derivative. Further, it is another object of the present invention to provide a light-emitting device and an electronic device which consumes low power and is driven at low voltage.

Problems solved by technology

It is difficult to obtain this characteristic by using a point light source typified by an incandescent lamp or an LED or by using a line light source typified by a fluorescent lamp.
There has been a problem that luminous efficiency of the light-emitting element is lowered due to transfer of the energy to NPB.

Method used

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  • Carbazole Derivative, and Light-Emitting Element, Light-Emitting Device, and Electronic Device Using Carbazole Derivative
  • Carbazole Derivative, and Light-Emitting Element, Light-Emitting Device, and Electronic Device Using Carbazole Derivative
  • Carbazole Derivative, and Light-Emitting Element, Light-Emitting Device, and Electronic Device Using Carbazole Derivative

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embodiment mode 1

[0089]In Embodiment Mode 1, a carbazole derivative of the present invention will be described.

[0090]The carbazole derivative of the present invention is represented by a general formula (1).

[0091]In the formula, α1, α2, α3, and α4 each represent an arylene group having less than or equal to 13 carbon atoms, which forms a ring; Ar1 and Ar2 each represent an aryl group having less than or equal to 13 carbon atoms, which forms a ring; R1 represents any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group; and R2 represents any of alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group. In addition, l, m, and n are each independent, which is 0 or 1.

[0092]In the general formula (1), α1 to α4 each represent an arylene group having less than or equal to 13 carbon atoms, which forms a ring. Specifically, subst...

embodiment mode 2

[0129]In Embodiment Mode 2, a light-emitting element which is formed using, for a hole-transporting layer, the carbazole derivative of the present invention described in Embodiment Mode 1 will be described.

[0130]The light-emitting element in Embodiment Mode 2 includes a first electrode which functions as an anode, a second electrode which functions as a cathode, and an EL layer interposed between the first electrode and the second electrode. Note that the light-emitting element in Embodiment Mode 2 can obtain light emission when voltage is applied to each electrode so that the potential of the first electrode is higher than that of the second electrode.

[0131]In addition, the EL layer of the light-emitting element in Embodiment Mode 2 includes in its structure a first layer (a hole-injecting layer), a second layer (a hole-transporting layer), a third layer (a light-emitting layer), a fourth layer (an electron-transporting layer), and a fifth layer (an electron-injecting layer), from ...

embodiment mode 3

[0184]In Embodiment Mode 3, a light-emitting element having a plurality of EL layers any of the light-emitting elements described in Embodiment Mode 2 (hereinafter referred to as a stacked-type light-emitting element) will be described with reference to FIG. 3. This light-emitting element is a stacked-type light-emitting element that has a plurality of EL layers (a first EL layer 303 and a second EL layer 304) between a first electrode 301 and a second electrode 302. Note that although a structure of two EL layers is described in Embodiment Mode 3, a structure of three or more EL layers may also be employed.

[0185]In Embodiment Mode 3, the first electrode 301 functions as an anode, and the second electrode 302 functions as a cathode. Note that for the first electrode 301 and the second electrode 302, structures similar to those described in Embodiment Mode 1 can be employed. Further, for the plurality of EL layers (the first EL layer 303 and the second EL layer 304), structures simil...

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Abstract

To provide a light-emitting element having high luminous efficiency and to provide a light-emitting device and an electronic device which consumes low power and is driven at low voltage, a carbazole derivative represented by the general formula (1) is provided. In the formula, α1, α2, α3, and α4 each represent an arylene group having less than or equal to 13 carbon atoms; Ar1 and Ar2 each represent an aryl group having less than or equal to 13 carbon atoms; R1 represents any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group; and R2 represents any of an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group. In addition, l, m, and n are each independently 0 or 1.

Description

TECHNICAL FIELD[0001]The present invention relates to a carbazole derivative, a light-emitting element, a light-emitting device, and an electronic device using a carbazole derivative.BACKGROUND ART[0002]In recent years, light-emitting elements using electroluminescence have been actively researched and developed. As a basic structure of these light-emitting elements, a layer containing a light-emitting substance is interposed between a pair of electrodes. By applying voltage to this element, light emission can be obtained from the light-emitting substance.[0003]Since such a light-emitting element is a self-luminous type, it has advantages over a liquid crystal display element, such as high visibility of the pixels and no need of backlight and is considered suitable for a flat panel display element. In addition, such a light-emitting element can be manufactured to be thin and light-weight, which is also a great advantage. Further, extremely high response speed is also a feature there...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J1/63C07D209/86
CPCC07D209/86C09K11/06C09K2211/1029H10K85/6572H10K85/636H10K85/633H10K50/11
Inventor NOMURA, HIROKOOSAKA, HARUEUSHIKUBO, TAKAHIROKAWAKAMI, SACHIKOSEO, SATOSHISHITAGAKI, SATOKO
Owner SEMICON ENERGY LAB CO LTD
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