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Transparent desiccant and organic electroluminescence device

An electroluminescence device and desiccant technology, which are applied in the directions of electroluminescence light source, lighting device, electric light source, etc., can solve the problem of difficulty in taking out light from a glass cover sheet, and achieve the effect of wide light-emitting area

Inactive Publication Date: 2010-03-31
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the above-mentioned organometallic complex becomes opaque after cracking when it absorbs moisture, it is difficult to extract light from the cover glass of the organic EL device in a short period of time.

Method used

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  • Transparent desiccant and organic electroluminescence device
  • Transparent desiccant and organic electroluminescence device
  • Transparent desiccant and organic electroluminescence device

Examples

Experimental program
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Effect test

no. 1 approach

[0029] The transparent desiccant according to the first embodiment contains a mixture of an alkoxide of a Group 2, Group 3 or Group 4 metal and a transparent organic polymer which is compatible with these metal alkoxides without reaction.

[0030] As the metal alkoxide, for example, aluminum alkoxide can be used. Examples of aluminum alkoxides include, for example, Futaba Electronics Co., Ltd. product name OleDry-L3 (containing 25% by weight of decane solvent).

[0031] The organic polymer is preferably a silicon-containing polymer, especially a silicon-containing polymer having silyl groups. Examples of such silicon-containing polymers include copolymers of 30 to 35 mol % of methylhydrogensiloxane and 65 to 70 mol % of dimethylsiloxane. It is preferable to contain 25 to 70% by volume of the organic polymer in the aforementioned mixture.

[0032] The transparent desiccant according to the first embodiment explained above contains a mixture of alkoxides of metals of Group 2, ...

no. 2 approach

[0035] The top emission type organic EL device according to the second embodiment has a structure in which a transparent counter substrate (such as a cover glass) is opposed to an organic EL substrate having a light emitting layer through a frame-shaped sealing member made of, for example, UV curable resin and is covered. fixed. A transparent desiccant film containing alkoxides of Group 2, Group 3, or Group 4 metals and a mixture of transparent organic polymers that do not react with these metal alkoxides is formed on the surface surrounded by the aforementioned frame-shaped sealing member. on the inner surface of the aforementioned transparent counter substrate.

[0036] As the metal alkoxide and organic polymer constituting the transparent desiccant, the same ones as those described above can be used. The transparent desiccant film can be formed on the aforementioned organic EL substrate by, for example, a coating method.

[0037] It is permissible to enclose an inert gas ...

no. 3 approach

[0044] As for the top emission type organic EL device according to the third embodiment, it is equipped with an organic electroluminescent substrate having a light emitting layer. The transparent protective film has at least a two-layer structure in which a transparent desiccant film and a transparent moisture-proof film are sequentially formed on the organic electroluminescent substrate containing the aforementioned light-emitting layer. The transparent desiccant film contains a mixture of alkoxides of Group 2, 3 or 4 metals and transparent organic polymers which are nonreactive and compatible with the alkoxides of these metals. The transparent protective film is preferably a three-layer laminated film in which the aforementioned moisture-proof film, the aforementioned desiccant film, and the aforementioned moisture-proof film are sequentially formed on the organic electroluminescence substrate.

[0045] Since the transparent desiccant film of the aforementioned composition c...

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Abstract

The invention provides a transparent desiccant for maintaining dry environment in an electroluminescence device, which transparent desiccant has hygroscopicity, causes no crack even after moisture absorption and can maintain transparency. The transparent desiccant includes a mixture of an alkoxide of a metal of the group II, III or IV, and a transparent organic polymer not reacting with but compatible with this metal alkoxide.

Description

technical field [0001] The present invention relates to a transparent desiccant and an organic electroluminescent device (organic EL device) provided with a film of the transparent desiccant. Background technique [0002] An organic EL device is a self-luminous device having a light-emitting layer. This light-emitting layer is degraded by moisture and oxygen, and produces non-luminous areas called "dark spots". [0003] Existing organic EL devices use an adhesive layer to bond the transparent opposite substrate (cover glass sheet) and the organic EL substrate with the light-emitting layer together under a nitrogen atmosphere, that is, by blocking the external atmosphere. combined, thereby protecting the aforementioned light-emitting layer from the intrusion of moisture and oxygen. However, in such an organic EL device, it is difficult to completely block the intrusion of moisture from the external atmosphere and protect the light-emitting layer. [0004] Thus, in a bottom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/28H05B33/04H01L51/50H01L51/56
Inventor 秋元佳子五十川昌邦
Owner KK TOSHIBA
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