Composition for forming light emitting layer and organic electroluminescent element containing said composition for forming light emitting layer

A light-emitting layer and composition technology, applied in the field of light-emitting layer-forming compositions and organic electroluminescent elements, can solve problems such as insufficient research, and achieve the effects of long driving life and high luminous efficiency

Active Publication Date: 2019-09-13
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the case of increasing the types of charge-transporting materials, it is considered that there is still insufficient research on the method of improving the driving life, which is an important characteristic of organic electroluminescent elements, and the method of maintaining storage stability at high temperatures.

Method used

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  • Composition for forming light emitting layer and organic electroluminescent element containing said composition for forming light emitting layer
  • Composition for forming light emitting layer and organic electroluminescent element containing said composition for forming light emitting layer
  • Composition for forming light emitting layer and organic electroluminescent element containing said composition for forming light emitting layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0253] make figure 1 The organic electroluminescence element of the composition shown.

[0254]

[0255] On the substrate 1 made of glass, a film (sputtering film-formed product, sheet resistance 15Ω) formed by forming an indium tin oxide (ITO) transparent conductive film with a thickness of 70 nm is patterned to a width of 2 mm by a common photolithography technique. The stripes form the anode 2. After cleaning the substrate 1 (ITO substrate) with the anode 2 in the order of ultrasonic cleaning with pure water and washing with pure water, it was dried by blowing nitrogen gas, and finally ultraviolet ozone cleaning was performed.

[0256]

[0257] Next, the hole injection layer 3 was formed by a wet film-forming method as follows.

[0258] Prepare 2.0% by mass of a polymer compound (weight average molecular weight 52000) having a repeating structure represented by the following formula (P1) as a hole-transporting compound, and 4-isopropyl-4'- as an electron-accepting com...

Embodiment 2

[0292] In Example 1, as the non-luminescent material and light-emitting material contained in the composition for forming a light-emitting layer, compound (HH-2), compound (LH-1), compound (LH-2), compound (H -1) Except having mixed the compound (D-1) at the mass ratio of 15:15:15:55:15, it carried out similarly to Example 1, and produced the organic electroluminescence element. In addition, compound (LH-2) is a compound which has the structure shown below, Tg is 87 degreeC, and molecular weight is 762.3. In addition, the content of the low Tg compound relative to the total amount of all non-luminescent materials contained in the composition for forming a light-emitting layer was 30% by mass, and the weighted average glass transition temperature of all non-luminescent materials was 110°C.

[0293]

Embodiment 3

[0295] In Example 1, as the non-luminescent material and light-emitting material contained in the composition for forming a light-emitting layer, compound (HH-1), compound (H-2), compound (H-3), compound (LH -1) and compound (D-1) were mixed at the mass ratio of 35:15:35:15:15, and the organic electroluminescence element was produced similarly to Example 1 except this. In addition, compound (H-2) and compound (H-3) are compounds which have the structure shown below, Tg is 129 degreeC, 109 degreeC, respectively, and molecular weight is 791.3 and 1157.5, respectively. The content of the low Tg compound relative to the total amount of all non-luminescent materials contained in the composition for forming a light-emitting layer was 15% by mass, and the weighted average glass transition temperature of all non-luminescent materials was 127°C.

[0296]

[0297]

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Abstract

The purpose of the present invention is to provide an organic electroluminescent element which has a long service life and excellent storage stability; and the present invention provides a compositionfor forming a light emitting layer, which is suitable for the organic electroluminescent element. The present invention specifically provides a composition for forming a light emitting layer of an organic electroluminescent element, which contains a light emitting material, a non-light-emitting material and an organic solvent, and which is characterized in that: the light emitting material may becomposed of one or more materials; the non-light-emitting material contains a high Tg compound having a glass transition temperature of not less than 130 DEG C and a low Tg compound having a glass transition temperature of not more than 100 DEG C; the content ratio of the low Tg compound relative to all the non-light-emitting materials is 10-70% by weight; and at least one of the non-light-emitting materials has a pyrimidine skeleton or a triazine skeleton.

Description

technical field [0001] The present invention relates to a composition for forming a light emitting layer and an organic electroluminescence device containing the composition for forming a light emitting layer. Background technique [0002] Organic electroluminescent elements can emit light of various colors with a simple element configuration, and therefore, in recent years, they have been actively developed as a technology for producing light-emitting devices such as displays and lighting. [0003] An organic electroluminescence element is an element in which holes and electrons are injected from an anode and a cathode, and each charge reaches a light-emitting layer, and the charges are recombined in the light-emitting layer to obtain light emission. Based on this principle, studies have been made to improve luminous efficiency by generally using a composition for forming a light-emitting layer containing not only a light-emitting material but also a charge-transporting mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H05B33/10H10K99/00
CPCH05B33/10H10K50/11H10K85/111H10K85/631H10K85/654H10K85/342H10K85/6572
Inventor 西尾逸美石桥孝一梶山良子弘大辅
Owner MITSUBISHI CHEM CORP
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