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Method for preparing transparent damp resistant coated electroluminescent powder

A technology of electroluminescence and coating, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of poor moisture-proof effect, harsh equipment requirements, uneven film formation, etc., and achieve easy mass production, low cost, transparent good light effect

Inactive Publication Date: 2005-06-29
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical vapor deposition has strict requirements on equipment, complex operation, serious pollution and huge energy consumption
The sol-gel method uses sol to gel on the surface of the electroluminescent powder to form a film. Its advantages are mild conditions and easy operation. The disadvantage is that the oxide formed on the surface of the electroluminescent powder after aging and dehydration is a network. Shaped film with mesh holes, so the moisture-proof effect is not good
The hydrolysis method is a method in which the hydrolyzed products of easily hydrolyzed substances are deposited on the surface of the electroluminescent powder to achieve transparent moisture-proof coating. The disadvantage is that the film is not uniform.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 110ml of tetraethyl orthosilicate, 60ml of N, N dimethylformamide, 220ml of ethanol, 110ml of water, 1.8ml of 25% concentrated ammonia water, stir at 70°C for 2 hours, add 400g of 2288 electroluminescent powder and stir for another 2h, Then put the electroluminescent powder in 400ml of benzene and reflux at 80°C for 12h, add 0.04g / ml of aluminum isopropoxide in 100ml of benzene solution and reflux for 12h, then raise the temperature of the 2288 type electroluminescent powder to 235°C within 12h, and keep the temperature constant After 24 hours, the temperature was raised to 550°C within 12 hours, kept at a constant temperature for 12 hours, and then annealed. That is, the transparent moisture-proof coated electroluminescent powder is completed.

Embodiment 2

[0016] Stir 50g of aluminum isopropoxide and 400ml of water at 80°C for 30 minutes, add 0.75ml of 25% ammonia water, reflux at 100°C for 24h, then add 400g of 4450-type electroluminescent powder, take it out after half an hour, and then Put the electroluminescent powder in 400ml of benzene and reflux at 70°C for 12h, add 0.05g / ml tetraethyl orthosilicate in 100ml of benzene solution and reflux for 12h, then raise the temperature of the 4450 type electroluminescent powder to 235°C within 12h, and keep the temperature constant After 24 hours, the temperature was raised to 550°C within 12 hours, kept at a constant temperature for 12 hours, and then annealed. That is, the transparent moisture-proof coated electroluminescent powder is completed.

Embodiment 3

[0018] Take 5g of ethyl titanate, 230ml of ethanol, 110ml of water, 0.5ml of 25% ammonia water, stir for 30 minutes, add 400g of 723 type electroluminescent powder and stir for 1h, then put the electroluminescent powder into 400ml of benzene in 80 Reflux at ℃ for 12 hours, add 14ml of toluene solution of 0.001g / ml aluminum isopropoxide and continue to reflux for 12 hours, then raise the temperature of the electroluminescent powder to 215℃ within 12 hours, keep the temperature constant for 24 hours, then raise the temperature to 600℃ in 12 hours, and keep the temperature at 12 hours, annealed. That is, the transparent moisture-proof coated electroluminescent powder is completed.

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Abstract

The invention relates to a method to prepare a transparent humidity resistant covering electroluminescence powder, realizing its preparation by the combination of sol-gel method and hydrolysis method. The invention has simple equipment and operation, low cost, the humidity resistant film formed on electroluminescence powder is average, and the transmission of light and electric performance are both outstanding, the electroluminescence powder processed by the invention stable performance, prolonged service life. It is a new method easy to be produced in large scale.

Description

technical field [0001] The invention relates to a preparation method of a transparent moisture-proof coated electroluminescent powder, in particular to a preparation method of a transparent moisture-proof coated electroluminescent powder through the organic combination of a sol-gel method and a hydrolysis method. Background technique [0002] The transparent moisture-proof coating of electroluminescent powder is generally realized by chemical vapor deposition method, sol-gel method, and hydrolysis method. The vapor phase deposition method is to use a fluidized bed to suspend the electroluminescent powder in the air, and then introduce acid mist and easily hydrolyzed substances such as tetraethyl orthosilicate to hydrolyze and adsorb on the surface of the electroluminescent powder to complete the transparent moisture-proof coating electrode. Luminescent powder. The chemical vapor deposition method has strict requirements on equipment, complicated ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06
Inventor 何宝林彭程
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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