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Organic electroluminescence element

An electroluminescence element and luminescence technology, applied in the direction of electroluminescence light sources, electrical components, electric light sources, etc., can solve problems such as unknown organic EL elements

Active Publication Date: 2006-02-01
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] However, in an organic EL element having a multilayer laminated structure, an organic EL element that emits light in a narrow band (narrow spectrum) with high color purity and has a long life is not yet known.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0276] A 25 mm x 75 mm x 1.1 mm thick glass substrate with an ITO transparent electrode (manufactured by Hoomatik Co., Ltd.) was cleaned ultrasonically for 5 minutes in isopropanol, and then cleaned with UV ozone for 30 minutes.

[0277] Install the cleaned glass substrate with transparent electrode lines on the substrate support of the vacuum evaporation device, and first form a film thickness of 60 nm on the surface of the side where the transparent electrode lines are formed to cover the above-mentioned transparent electrodes. N, N'-bis(N,N'-diphenyl-4-aminophenyl)-N,N-diphenyl-4,4'-diamino-1,1'-biphenyl film (abbreviated below for "TPD232 film"). This TPD232 film functions as a hole injection layer.

[0278] After the TPD232 film is formed, a N,N,N',N'-tetrakis(4-biphenylyl)-diaminobiphenyl layer (hereinafter referred to as "TBDB layer") with a film thickness of 20nm is formed on the TPD232 film . This film functions as a hole transport layer.

[0279] Further, H1 as t...

Embodiment 2

[0285] In addition to making the film thickness of the first light-emitting layer 10 nm and the ratio of D1:H1 to 0.3:10 (weight ratio), the film thickness of the second light-emitting layer was 30 nm and the ratio of D2:H1 to 1.4:30 (weight ratio) Otherwise, an organic EL element was fabricated in exactly the same manner as in Example 1 (about 3.3 mol% of the first dopant and about 5.3 mol% of the second dopant).

Embodiment 3

[0287] In addition to making the film thickness of the first light-emitting layer 20 nm and the ratio of D1:H1 to 0.5:20 (weight ratio), the film thickness of the second light-emitting layer was 20 nm and the ratio of D2:H1 to 1.0:20 (weight ratio) Otherwise, an organic EL element was fabricated in exactly the same manner as in Example 1 (about 2.8 mol% of the first dopant and about 5.7 mol% of the second dopant).

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Abstract

An organic electroluminescent element comprising an anode, a first light-emitting layer containing at least a first host material and a first dopant, and a second light-emitting layer containing at least a second host material and a second dopant in the following order , and the cathode, characterized in that: the energy gap E of the first host material gh 1. The energy gap E of the first dopant gd 1. The energy gap E of the second host material gh 2 and the energy gap E of the second dopant gd 2 satisfy the following formula, and the luminous intensity I1 of the luminous maximum wavelength from the luminous spectrum of the first luminous layer and the luminous intensity I2 of the luminous maximum wavelength of the luminous spectrum from the second luminous layer satisfy the following formula: E gh 1>E gd 1;E gh 2>E gd 2;E gd 1>E gd 2; I1>3.5×I2.

Description

technical field [0001] The present invention relates to an organic electroluminescent element, and more specifically relates to an organic electroluminescent element with a two-layer structure for the light emitting layer. Background technique [0002] Electroluminescence elements utilizing electroluminescence (hereinafter referred to simply as "EL") emit light by themselves, so they are highly visible, and because they are completely solid elements, they have excellent impact resistance, etc., and are therefore used in various It is attracting attention to use it as a light-emitting element in a variety of display devices. [0003] Among the EL elements, there are inorganic EL elements using inorganic compounds as light-emitting materials and organic EL elements using organic compounds. Among them, in addition to greatly reducing the applied voltage, organic EL elements can easily perform full-color EL elements. , and consumes less electric power, and can perform surface e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/22H05B33/14
Inventor 福冈贤一松浦正英山本弘志细川地潮
Owner IDEMITSU KOSAN CO LTD
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