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Coating method utilizing organic light-emitting device drying agent which can be coated

An electroluminescent device and desiccant technology, applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of complicated operation process, influence on appearance, weak moisture absorption rate, etc., and achieve obvious water absorption effect, good sealing effect, Good drying performance

Inactive Publication Date: 2014-08-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional desiccants are mainly packaged in sheets, which are pasted on the surface of the package cover and then packaged. The operation process is complicated and affects the appearance. At the same time, the price of desiccants in sheets is very expensive; the conventional OLED packaging method is Or barium oxide is evaporated or pasted on the package cover. Calcium oxide has strong hygroscopicity and fast absorption speed, but the service life is short, the moisture absorption rate is weak, and the average saturation state of absorption is about 40%. Barium oxide is the earliest used , the moisture absorption effect and service life are relatively good, but it is toxic and difficult to work, which affects the use of conventional desiccants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Pre-treatment of the cover: use alcohol to clean the glass package cover in an ultrasonic cleaner;

[0021] 2) Preparation of desiccant precursor solution: by mass parts, get 10 parts of glass fiber cationic film-forming agent emulsion and 8 parts of tin chloride, and dissolve tin chloride in water to form tin chloride at room temperature saturated solution to obtain a desiccant precursor;

[0022] 3) Coating of desiccant: apply the desiccant precursor solution obtained in step 2) on the inner surface of the package cover by adopting the seal method;

[0023] 4) Drying to form a film: put the package cover coated with the desiccant precursor solution on the inner surface into a drying oven, and dry it at 150° C. for 20 minutes.

Embodiment 2

[0025] 1) Pre-treatment of the cover: use acetone to clean the metal package cover in an ultrasonic cleaner;

[0026] 2) Preparation of desiccant precursor solution: in parts by mass, take 20 parts of cationic polyurethane emulsion and 3 parts of zinc chloride, and dissolve zinc chloride in water at room temperature to form a saturated solution of zinc chloride, Prepare desiccant precursor;

[0027] 3) Coating of desiccant: apply the desiccant precursor solution obtained in step 2) on the inner surface of the package cover by screen printing;

[0028] 4) Drying to form a film: put the packaging cap whose inner surface is coated with the desiccant precursor solution into a drying oven, and dry at a temperature of 180° C. for 26 minutes.

Embodiment 3

[0030] 1) Pre-treatment of the cover: use alcohol to clean the metal package cover in an ultrasonic cleaner;

[0031] 2) Preparation of desiccant precursor solution: in parts by mass, take 30 parts of a mixed solution of cationic polyurethane emulsion and cationic acrylate composite emulsion and 4 parts of antimony chloride, and dissolve antimony chloride in Water forms a saturated solution of antimony chloride to obtain a desiccant precursor;

[0032] 3) Coating of desiccant: apply the desiccant precursor solution obtained in step 2) on the inner surface of the package cover by screen printing;

[0033] 4) Drying to form a film: put the package cover coated with the desiccant precursor solution on the inner surface into a drying oven, and dry at 200° C. for 24 minutes.

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PUM

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Abstract

The invention discloses a coating method utilizing an organic light-emitting device drying agent which can be coated and belongs to the field of OLED (organic light emitting diode) manufacturing. The method includes: mixing low-cost film-forming agents with stannic chloride or calcium chloride to prepare the drying agent for OLED encapsulation, coating the drying agent on the inner surface of an encapsulation cover by means of screen printing or stamping, and drying. Low-cost film-forming agents and chloride drying agents are utilized to prepare the liquid drying agent which can be coated, during use, the liquid drying agent is coated on the inner surface of the encapsulation cover, and the encapsulation cover coated with the liquid drying agent is dried in a constant-temperature container. Compared with traditional drying pieces, the liquid drying agent is simple to prepare, reusable, capable of being preserved in atmosphere, better in drying performance, evident in water absorption effect, capable of being coated on the inner surface of the encapsulation cover, good in seal effect, cheap and low in cost.

Description

technical field [0001] The invention belongs to the field of OLED manufacture, and relates to a coating method of a desiccant for encapsulating an OLED device, in particular to a coating method using a desiccant that can be coated with an organic electroluminescent device. Background technique [0002] OLED has the advantages of solid-state luminescence, high efficiency, fast response, light weight, thin thickness, flexible device, and low cost, and is regarded as one of the most promising products in the 21st century. OLED (Organic light emitting diode) organic light-emitting diode has the characteristics of spontaneous, wide viewing angle, fast response time, high luminous efficiency, low operating voltage, thin panel thickness, large-size and bendable panels and simple manufacturing process. Potential for low cost. However, since the materials used in OLED devices are organic materials, most of the organic substances in the light-emitting layer are sensitive to pollutant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D7/24B05D3/02H01L51/56
Inventor 张方辉黄晋张微张思璐刘文婷李怀坤
Owner SHAANXI UNIV OF SCI & TECH