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Method for preserving organic polymeric material and organic electroluminescent device

A polymeric material and organic technology, applied in the field of organic electroluminescent devices, can solve the problems of structural changes, unsatisfactory luminous brightness, unclear interface, etc., and achieve the effect of inhibiting changes

Inactive Publication Date: 2006-11-15
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, this wet method has a problem in that it is difficult to form the organic layer into a laminated structure
For example, there is a problem that when a coating material containing an organic solvent for forming a second organic layer is applied to a first organic layer composed of an organic material, the organic material constituting the first layer is used in the second organic layer. The organic solvent contained in the coating material of the second organic layer dissolves, so the interface between the first organic layer and the second organic layer becomes unclear
[0010] However, this method has another problem in that polyethylene-bis-oxythiophene into which polystyrenesulfonic acid has been introduced exhibits Strongly acidic, leading to changes in its structure over time in long-term storage
[0011] As a result, when an organic EL device is formed using such polyethylene-di-oxythiophene into which polystyrenesulfonic acid has been introduced and stored for a long period of time in the state of dispersion in water, satisfactory luminance of light emission cannot be obtained

Method used

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  • Method for preserving organic polymeric material and organic electroluminescent device
  • Method for preserving organic polymeric material and organic electroluminescent device
  • Method for preserving organic polymeric material and organic electroluminescent device

Examples

Experimental program
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Effect test

Embodiment 1

[0104] PEDT / PSS (which is a hole transport material and manufactured by Bayer Corp. under the trade name "Baytron P") was dispersed in pure water so that its concentration could be 2% by weight to prepare a dispersion liquid. Next, this dispersed liquid was passed through a dialysis membrane having a molecular weight cutoff of 3,000 to remove ethylene glycol. It should be noted that the pH (at 25° C.) of the dispersion liquid was 1.2.

[0105] Next, dissolve NH in pure water 4 Cl (pH adjuster) so that its concentration is 30% by weight to prepare NH 4 Cl aqueous solution. Will NH 4 The aqueous Cl solution was added dropwise to the dispersion liquid to adjust the pH (at 25° C.) of the dispersion liquid to 3.0. Place the pH-adjusted dispersion liquid in an airtight closed space (i.e., in the state of cutting off the outside air), and then store it in a dark place (i.e., in the state of cutting off light) at 25°C for 1 month and 3 months, respectively. month and 5 months. The...

Embodiment 2

[0109] An organic EL device was manufactured in the same manner as in Example 1, except that the dispersion liquid was diluted with pure water (i.e., a diluent), and the ethylene glycol was removed in the same manner as in Example 1. The pH (at 25° C.) of the dispersion liquid was adjusted to 3.0. It should be noted that each dispersion liquid after preservation was concentrated using a dialysis membrane (which is manufactured by Millipore Corp. under the trade name "PelliconBiomax") before manufacturing the organic EL device, so that PEDT / PSS contained in the liquid was dispersed The amount is 2% by weight.

Embodiment 3

[0111] An organic EL device was fabricated in the same manner as in Example 1, except that by adding a Pt electrode (i.e., removing H by dipping + ion device) immersed in the dispersion liquid to release H from the dispersion liquid + Ions convert to H 2 , the pH (at 25° C.) of the dispersion liquid from which ethylene glycol was removed in the same manner as in Example 1 was adjusted to 3.0.

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Abstract

A method for preserving an organic polymeric material, wherein an organic polymeric material which exhibits strong acidity is preserved with it being dissolved or dispersed in a liquid mainly comprised of water, the method is characterized in that the organic polymeric material is preserved with it being dissolved or dispersed in the liquid so that a concentration thereof is 2 wt%, and a pH (at 25 DEG C) of the thus obtained liquid is measured and then adjusted so as to be to be higher than the measured pH (at 25 DEG C). Further, it is preferred that a pH (25 DEG C) of the liquid before the pH adjustment is 2.2 or lower and a pH (25 DEG C) of the liquid after the pH adjustment is in the range of 2.5 to 7.5. According to this, even if the organic polymeric material is preserved for a long period of time, it is possible to prevent or reduce a change in a molecular structure thereof with the lapse of time.

Description

technical field [0001] The present invention relates to a method of preserving organic polymeric materials and an organic electroluminescent device. Background technique [0002] Organic electroluminescence devices (hereinafter, referred to as "organic EL devices") are known. The organic EL device has a structure in which at least one light-emitting organic layer (organic electroluminescent layer) is provided between a cathode and an anode. Such organic EL devices can significantly reduce the applied voltage compared to inorganic EL devices. In addition, it is possible to fabricate devices that can provide various emission colors. [0003] Now, in order to obtain a high-performance organic EL device, various studies are actively being carried out through various technical ideas that have been proposed in the development and improvement of materials used and the device structure thereof. [0004] So far, organic EL devices that can provide various luminescent colors or org...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/30H01L51/50C08L101/12H01L51/00H01L51/56
CPCH10K85/115H10K85/1135H10K85/649H10K50/14H10K10/40H10K10/00H05B33/10H10K71/00
Inventor 筱原誉莜原祐治寺尾幸一
Owner SEIKO EPSON CORP