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Organic electroluminescent device

An electroluminescent device and electroluminescent technology, applied in the direction of electro-solid devices, electrical components, luminescent materials, etc., can solve the problems of difficult commercial application, lack of material reliability, and high driving voltage

Inactive Publication Date: 2009-11-18
NIPPON STEEL CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the glass transition temperature (Tg) of HMTPD is about 50°C, it is easy to crystallize and lacks reliability as a material.
Therefore, the life of the device is extremely short, it is difficult to apply commercially, and there is also a problem of high driving voltage

Method used

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  • Organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Copper phthalocyanine (CuPC) was used for the hole injection layer, α-NPD was used for the hole transport layer, and Alq3 was used for the electron transport layer. On a glass substrate with an anode formed of ITO with a film thickness of 110nm, the vacuum evaporation method was used at a vacuum degree of 5.0×10 -4 Each thin film was laminated|stacked at Pa. First with 3.0 / sec CuPC as a hole injection layer is formed on ITO with a thickness of 25nm. followed by 3.0 α-NPD as a hole transport layer was formed on the hole injection layer at a vapor deposition rate of 55 nm at a vapor deposition rate of 55 nm.

[0101] Second, BmqAl (compound 1) and Irbt were co-evaporated on the hole transport layer from different evaporation sources 3 (Compound 31), a light-emitting layer having a thickness of 47.5 nm was formed. At this time, Irbt 3 The concentration is 7.0%.

[0102] Second, with 3.0 / sec evaporation speed forms Alq3 as an electron transport layer with a thi...

Embodiment 2

[0104] In addition to co-evaporating BAlq (compound 11) and Irbt from different evaporation sources 3 (Compound 31) An organic EL device was fabricated in the same manner as in Example 1 except that a light emitting layer having a thickness of 47.5 nm was formed. It should be stated, Irbt 3 The concentration is 7.0%.

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Abstract

The present invention relates to an organic electroluminescent device (organic EL device) utilizing phosphorescent light emission in which the luminous efficiency of the device is improved and the drive stability is sufficiently ensured. This organic EL device is formed by laminating an anode 2, an organic layer including a hole transport layer 4, a light emitting layer 5, and an electron transport layer 6, and a cathode 7 on a substrate 1 with a hole transport layer between the light emitting layer and the anode, There is an electron transport layer between the light-emitting layer and the cathode, and the light-emitting layer contains an organic Al complex represented by the following general formula (I) as a host material, and an organic Ir complex represented by the following general formula (II) as object material. It should be noted that in the formula, L represents ArO-, ArCOO-, Ar3SiO-, Ar3GeO- or Ar2AlO-.

Description

technical field [0001] The present invention relates to an organic electroluminescence device (hereinafter referred to as an organic EL device), and more particularly, to a thin-film type device that emits light by applying an electric field to a light-emitting layer containing an organic compound. technical background [0002] In the development of electroluminescent devices using organic materials, by optimizing the type of electrodes for the purpose of increasing the charge injection efficiency from the electrodes, a hole transport layer containing aromatic diamine is provided as a thin film between the electrodes The development of a device including a light-emitting layer of 8-hydroxyquinoline aluminum complex (hereinafter referred to as Alq3) has greatly improved the luminous efficiency compared with the existing device using a single crystal such as anthracene. Progress has been made towards the practical use of high-performance flat panels featuring self-illumination...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50C09K11/06
Inventor 宫崎浩平安山夏美
Owner NIPPON STEEL CHEMICAL CO LTD