Composition, film manufacturing method, as well as functional device and manufacturing method therefor

Abstract

A composition, which can be used in an ink jet printing method, can use either a non-polar or a weakly polar material as a functional material, prevents clogging at dispensing time, achieves stable dispensing, and prevents precipitation of content matter during dispensing and phase separation during film formation, a uniform, homogenous functional film formed using this composition and a manufacturing method therefor, as well as an organic EL device or other such display device and a manufacturing method therefor. A composition of the present invention consists of a functional material, and a solvent comprising at least one benzene derivative, which has one or more substituents, and these substituents have 3 or more carbon atoms in total. A functional film of the present invention is formed using the above-mentioned composition. A display device of the present invention comprises luminescent material layers formed using the above-mentioned composition between two electrodes. The above-mentioned display device is an organic EL device or the like.

Description

TECHNICAL FIELD [0001] The present invention relates to a composition (dispensing composition), which is used to form a functional material patterned film, and can be stably dispensed using a dispensing apparatus, a film manufacturing method, which forms a uniform film (functional film) using this composition, as well as a functional device comprising luminescent material layers formed using the above-mentioned composition, and particularly a functional device (display device), such as an organic electroluminescent (EL) device, which is useful in luminescent display applications, and a manufacturing method therefor. BACKGROUND ART [0002] In the past, functional material patterning has been done using photolithography techniques. Because this method has drawbacks, such as high costs and complicated processes, recently, functional material patterning using a dispensing apparatus, which is convenient, and makes cost cutting possible, has been under study. A method, which uses an ink je...

AI Technical Summary

Problems solved by technology

Because this method has drawbacks, such as high costs and complicated processes, recently, functional material patterning using a dispensing apparatus, which is convenient, and makes cost cutting possible, has been under study.

A pattern forming method using a conventional ink jet printing technique such as this has extremely outstanding characteristics, such as saving labor, saving resources, and not requiring mask making, but it also has the drawback of limiting the materials used in the composition (dispensing composition).

There is also the drawback that functional materials, which either react with water and alcohol, or are decomposed by alcohol, cannot be used.

Further, in a case in which benzene, toluene, xylene or another solvent that readily dissolves a non-polar material is used as the solvent for dissolving a functional material, due to the low boiling point (high vapor pressure) of such a solvent, the drawback is that it dries easily, and is apt to cause nozzle clog.

In addition thereto, in the case of a functional material having multiple constituents, the drawback is that phase separation occurs, the film becomes non-uniform, and the functional film is no longer able to carry out its original role.

Furthermore, in a case in which a material, which cannot be easily used, and has poor solubility like this, is used anyway, and the concentration of the dispensing composition is increased, precipitation and clogging occur.

When the concentration is made weaker in an attempt to prevent clogging, the drawback is that dispensing must be performed numerous times to achieve the characteristics of the functional material, and the number of processes must be increased.

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