JPS5827831B2 - GAS HOUDEN PANEL - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a phosphor for a gas discharge panel.

There are two types of gas discharge panels, known as plasma display panels (FDP): C-type panels and AC-type panels, both of which use phosphors to perform color conversion. A phosphor is used that has the characteristic of emitting light of a desired color by absorbing ultraviolet light in the discharge light in the panel.

However, it has been confirmed that charged particles generated by discharge collide with the phosphor in the panel, significantly shortening the life of the phosphor.

Also, in a C-type panel, the phosphor side is used as an anode, so ions can hardly be applied to the phosphor, but in an AC-type panel like PD■), electrons and ions are alternately exposed to the phosphor. Since they collide with the phosphor, the characteristics of the phosphor are significantly deteriorated by charged particles, especially ions.

By the way, as a conventional technique for protecting a phosphor from charged particles, there is a case in which a protective coachnog is applied to a phosphor in a mercury discharge tube or the like for the purpose of preventing ionic deterioration.

However, this protective coachnog has a structure in which yo-4-fufu particles are scattered on the surface of the phosphor particles, which reduces the deterioration of the phosphor due to the negative effect of the yo-4-fufu particles on ions. It's just what I was aiming for.

This is based on the idea of exposing most of the bare surface of the phosphor to the excited electrons of the phosphor while minimizing the frequency of ion collisions with the exposed surface.

On the other hand, in I) D P, unlike in the case of a mercury discharge tube, ions collide with the phosphor from many directions, and therefore the negative effect of Cope 71 particles scattered in the phase shown in Table 1. In this case, deterioration of the phosphor cannot be effectively suppressed.

Moreover, since the area occupied by the Coachnob particle groups scattered in the direction of the phosphor -L limits the internal area exposed to excitation light, the luminous efficiency also decreases, making it undesirable as a phosphor for P, I) and I).

However, in view of the above-mentioned problems, an object of the present invention is to provide a phosphor for 1) L) P that avoids deterioration of characteristics due to ion collision as much as possible without substantially reducing luminous efficiency.

In short, the purpose of the present invention is to focus on the fact that a phosphor for P (I) P that emits light when excited by light in a specific wavelength range, specifically ultraviolet light, is used, and the particles of the phosphor are exposed to ultraviolet light. This is achieved by coating the entire surface with a metal compound that has good transmittance and excellent ion bombardment resistance, that is, by micro-encapsulating the particles of the phosphor with the metal compound having the characteristics.

This microencapsulation of phosphor involves dispersing and suspending phosphor particles in a dispersion medium containing a small amount of water, and adding the suspension to the blade side (
A metal alcoholate, which becomes a metal oxide and alcohol with good ultraviolet transmittance and excellent ion impact resistance upon decomposition, is gradually dropped, and the force of the alcoholate and a small amount of water [ ]
This is carried out by forming a layer of the metal oxide on the surface of the phosphor particles through a water-splitting reaction.

As the ultraviolet-transmitting phase having excellent ion impact resistance according to the present invention, oxides such as SiO□, Al2O3, and MgO are preferable.

The alcohols of these metals, namely silicon, aluminum, and magnesium, have the property of being hydrolyzed;
Therefore, when added to water, it decomposes into the metal oxide and alcohol.

However, in the present invention, silicon is regarded as a type of metal.

These alcoholates include aluminum isopropyl
/-1-AI(i0c3H7)3j aluminum n ptoogicide AI(nOC4H9)3. Siliconoisopropylate 5i (i0C2H,,)4. Various materials such as silicon n-butoxide S + (n0c4 Hg) 4 +magnesium methylate Mg (OC, I-(3) 2 tmagnesium ethylate Mg (OC2t■5)2) can be used.

A feature of the present invention is that in order to form a film of the metal oxide on the surface of the phosphor particles, a hydrolysis reaction is caused at the interface between the dispersion medium and a small amount of water, and the surface of the phosphor particles is changed to the wall surface. The purpose of this method is to grow polymers such as SiO3, Al□03°MgO'j.

This method has the advantage that the thickness of the film formed on the surface of the phosphor particles is uniform, and the thickness can be controlled arbitrarily by adjusting the amount of water, the amount of alcoholate added, and the amount of the phosphor particles. There is.

Although various dispersion media can be used, it is actually preferable to use lower alcohols.

Since this alcohol generally contains a small amount of water, it has the advantage that it can be used as is without the need to add water.

The resulting water content is preferably 0.1 to 1% of the dispersion medium.

The film thickness of the formed film is preferably in the range of 500λ to 10,000λ, but in order to produce such a film, the relationship between the dispersion medium and the amount of phosphor particles is such that the amount of phosphor particles is 1.00% of the dispersion medium. It is preferable that the amount is 10 or less.

The mixing ratio of the alcoholate and the amount of phosphor particles varies depending on the relationship between the size of the phosphor particles and the film thickness of the ifJ recording film, so it is difficult to determine a generally preferable range. Can not.

The phosphor particles coated with the metal oxide are taken out from the dispersion medium, once dried, and then subjected to dehydration heat treatment again.

This heat treatment is preferably carried out for 600 minutes in air or in direct sunlight.
Perform with C or higher.

This dehydration heat treatment completely removes OH groups that inhibit the characteristics of FDP from the protective film, thereby making the protective film more stable.

The microcapsule phosphor particles can be coated onto the required substrate of the gas discharge panel (I)DP) by conventional methods such as spraying, precipitation, electrodeposition, and a method using a photosensitive liquid.

F having the phosphor according to the present invention thus obtained
When we conducted a phosphor brightness test with DP and a conventional PI with a bare phosphor, the brightness of the conventional phosphor was halved in 15 hours, but the brightness of the present invention was halved in 15 hours. 1ooo
It can be seen from this that the protective film for the phosphor provided by the method of the present invention is highly effective.

Claims (1)

[Claims] 1. Silicone, aluminum, and magnesium alcohols are produced by suspending phosphor particles in an organic dispersion medium containing a small amount of water, and producing metal oxides and alcohols with high ultraviolet transmittance and excellent ion impact resistance through hydrolysis. I/-t was gradually added dropwise to the suspension, and the mixture of the metal compound and the sample water was added dropwise to the suspension.
1. A method for producing a phosphor for a gas discharge panel, comprising forming a coating layer of the metal oxide with a film thickness of 500 to 10,000 on the surface of the phosphor particles by water decomposition warping.