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

A light-emitting element and light-emitting layer technology, applied in lighting devices, electroluminescent light sources, light-emitting materials, etc., to achieve the effects of high external quantum efficiency, improved luminous efficiency, and high energy transfer efficiency

Active Publication Date: 2017-05-24
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the light extraction efficiency of current light-emitting elements is considered to be about 20% to 30%, and even considering light absorption by reflective electrodes or transparent electrodes, the limit of external quantum efficiency of light-emitting elements using phosphorescent compounds is considered to be about 25%.

Method used

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

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Embodiment approach 1

[0077] In this embodiment mode, the concept of constituting the light-emitting element of one embodiment of the present invention and the specific structure of the light-emitting element will be described. In addition, a light-emitting element according to one aspect of the present invention is a light-emitting element formed by sandwiching an EL layer including a light-emitting layer between a pair of electrodes (anode and cathode), wherein the light-emitting layer contains at least triplet excited The state can be converted into a first light-emitting substance (guest material) that emits light, a first organic compound with electron transport (host material) and a second organic compound with hole transport (auxiliary material), and has a first light-emitting layer and a stacked structure of a second light-emitting layer, the first light-emitting layer is formed on the anode side, and the second light-emitting layer at least contains a second light-emitting substance (guest ...

Embodiment approach 2

[0126] In this embodiment, refer to Figure 5 An example of a light emitting element of one embodiment of the present invention will be described.

[0127] In the light-emitting element shown in this embodiment mode, as Figure 5 As shown, an EL layer 203 including a light emitting layer 206 is sandwiched between a pair of electrodes (a first electrode (anode) 201 and a second electrode (cathode) 202). The EL layer 203 has a first light emitting layer 206a and a second In addition to the light emitting layer 206 of the laminated structure of the light emitting layer 206b, a hole injection layer 204, a hole transport layer 205, an electron transport layer 207, an electron injection layer 208, and the like are included.

[0128] In addition, the light-emitting layer 206 shown in this embodiment mode has a laminated structure of a first light-emitting layer 206a and a second light-emitting layer 206b. In the first light-emitting layer 206a of the light-emitting layer 206, a fir...

Embodiment approach 3

[0156] In this embodiment mode, a light-emitting element having a structure having a plurality of EL layers (hereinafter referred to as a tandem light-emitting element) with a charge generation layer interposed therebetween will be described as one aspect of the present invention.

[0157] The light-emitting element shown in this embodiment is as follows Figure 6A A tandem light emitting element having a plurality of EL layers (first EL layer 302(1) and second EL layer 302(2)) between a pair of electrodes (first electrode 301 and second electrode 304) as shown .

[0158] In the present embodiment, the first electrode 301 is an electrode serving as an anode, and the second electrode 304 is an electrode serving as a cathode. In addition, as the first electrode 301 and the second electrode 304, the same configuration as that of the first embodiment can be employed. In addition, either or both of the plurality of EL layers (first EL layer 302(1) and second EL layer 302(2)) may ...

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Abstract

The invention provides a light-emitting element with high external quantum efficiency. Furthermore, a light-emitting element having a long lifetime is provided. In one embodiment, the light-emitting element comprises a light-emitting layer between an anode and a cathode, wherein the light-emitting layer comprises a first light-emitting layer which at least contains a first light-emitting substance converting triplet excitation energy into light emission, a first organic compound having an electron-transport property, and a second organic compound having a hole-transport property, the light-emitting layer comprises a stack structure of the first light-emitting layer and a second light-emitting layer, and the first light-emitting layer is formed on the anode side. The second light-emitting layer contains a second light-emitting substance converting triplet excitation energy into light emission, the second organic compound, and a third organic compound having an electron-transport property. The first organic compound has a higher LUMO level than the third organic compound. The first light-emitting substance emits light with a wavelength shorter than that of light emitted from the second light-emitting substance. The first and the second organic compounds form an exciplex. The second and the third organic compounds form an exciplex.

Description

technical field [0001] One aspect of the present invention relates to a light-emitting element in which an organic compound that emits light by applying an electric field is sandwiched between a pair of electrodes. Moreover, one aspect of the present invention relates to a light-emitting device, electronic equipment, and lighting device including such a light-emitting element. Background technique [0002] A light-emitting device in which an organic compound is used as a light-emitting body, which has characteristics such as thinness and light weight, high-speed response, and DC low-voltage drive, is expected to be applied to next-generation flat panel displays. In particular, it is considered that a display device in which light-emitting elements are arranged in a matrix has an advantage of having a wider viewing angle and excellent visibility than conventional liquid crystal display devices. [0003] It is generally believed that the light emitting mechanism of a light em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H05B33/14
CPCH05B33/14H10K85/633H10K85/631H10K85/654H10K85/6576H10K85/6572H10K85/342H10K50/11H10K2101/40H10K50/13H10K2101/10H10K2101/90H10K2101/30C09K11/06H10K50/155H10K50/165
Inventor 濑尾哲史濑尾广美
Owner SEMICON ENERGY LAB CO LTD
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