KR100614040B1 - Plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP) having a green phosphor layer structure having excellent discharge stability and lifetime characteristics. More particularly, the present invention relates to a green phosphor having a different surface potential in a unit cell. The present invention relates to a plasma display panel which has excellent discharge stability than the case where a green phosphor is used alone, and has a longer lifespan than a case where a mixture of green phosphors is used.

Plasma display panel, green phosphor, separation, discharge stability, lifespan

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a perspective view showing the structure of a plasma display panel.

FIG. 2 is a schematic diagram showing an example of the green phosphor layer of the present invention, in which two green phosphors having different surface potentials in a unit cell are bisected in a direction parallel to the partition walls of the cell. to be.

3 is a schematic diagram showing an example of the green phosphor layer of the present invention, a schematic diagram showing a structure in which different green phosphors are bisected in a direction parallel to the cell partition wall by the auxiliary partition wall.

Figure 4 is a schematic diagram showing an example of the green phosphor layer of the present invention, a schematic diagram showing a structure in which different green phosphors are formed by forming two layers.

5 is a schematic diagram showing an example of the green phosphor layer of the present invention, in which a bottom phosphor layer is coated with a first green phosphor on a bottom surface, and second and third green phosphors are coated on both partition walls, respectively. It is a schematic diagram which shows the structure containing a partition phosphor layer.

[Industrial use]

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having excellent discharge stability and excellent life characteristics.

[Private Technology]

Plasma display panel (plasma diplay panel) is a display device using a plasma phenomenon, the discharge is generated when more than one potential difference is applied between two spatially separated contact in the gas atmosphere of the non-vacuum state, this is called a gas discharge phenomenon.

A plasma display element is a flat panel display element which applied such gas discharge phenomenon to image display. A plasma display panel generally used at present is a reflective AC drive plasma display panel, and in the case of a bottom plate structure, a phosphor layer is formed on a partition wall.

1 is a perspective view of the plasma display panel 1. As shown in FIG. 1, between the two substrates constituting the upper substrate 3 and the lower substrate 5, a plurality of partitions 7 forming discharge cells are arranged at regular intervals. Green and blue phosphor layers 9 are formed. Address electrodes 11 to which address signals are applied are formed on the lower substrate 5, respectively. The upper substrate 3 has a large number of X electrodes 13 and Y electrodes 15 forming a pair of sustain electrodes for one discharge cell at a predetermined interval in a direction crossing the address electrode 11. Is formed. The discharge space is filled with a discharge gas such as Ne-Xe or He-Xe. That is, two electrodes are provided in the discharge space of the plasma display panel, and red, green, and blue phosphors are arranged in a regular pattern in the phosphor layer 9. When a predetermined voltage is applied between the electrodes, plasma discharge occurs. The phosphor layer is excited by ultraviolet rays generated during plasma discharge, and the excited phosphor emits light.

In order for the plasma display panel to exhibit a uniform and stable discharge, the surface potential of the phosphor is high, and high temperature gaseous anions must collide with the phosphor layer at high speed. The higher the surface potential of the phosphor, the greater the potential difference between the phosphor and the anion, thereby realizing a plasma discharge exhibiting uniform and stable light emission characteristics. Such phosphors are manufactured by mixing solid powder raw materials and firing them at a high temperature. The surface potential of the phosphors may vary depending on the composition and raw material properties of the phosphors thus prepared.

Particularly, Zn ₂ SiO ₄ : Mn green phosphors used for plasma display panels are prepared by mixing solid raw materials of ZnO, SiO ₂ , MnCO ₃ , where an intermediate product or a product having a nonuniform composition ratio is formed, and red and blue phosphors are formed. Unlike, the surface potential has a negative charge.

This affects the potential of the surface of the phosphor layer in the panel, and builds up wall charges during reset discharge, which is a characteristic of AC plasma display operation during actual discharge. By absorbing and canceling the cations, which are wall charges, accumulated on the surface, the result increases the address discharge voltage added for discharge in the next address discharge period. In other words, by providing a surface potential different from red, blue, high discharge voltage is required. Therefore, studies are being conducted to increase the surface potential of the green phosphor to have a surface potential similar to that of the red and blue phosphors.

In order to solve this problem, Korean Patent Publication No. 2001-62387 describes a green phosphor in which Zn ₂ SiO ₄ : Mn and YBO ₃ : Tb are mixed. However, this green phosphor has a problem in that color purity and lifetime are lowered. In addition, Korean Patent Laid-Open Publication No. 2000-60401 describes the mixing of Zn ₂ SiO ₄ with a material having a positive potential of magnesium oxide and zinc oxide. However, the phosphor produced by this method also has a problem that the color purity and life is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a plasma display panel having excellent discharge stability and excellent life characteristics.

In order to achieve the above object, the present invention provides a plasma display panel in which separate green phosphor layers are formed in a state in which green phosphors having different surface potentials are not mixed in a unit cell.

Hereinafter, the present invention will be described in more detail.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, in which separate phosphor layers are formed inside a unit cell without mixing green phosphors having different surface potentials, and thus have excellent discharge stability and lifetime characteristics.

According to a first preferred embodiment of the green phosphor layer structure of the present invention, the present invention provides a plasma in which two types of green phosphor layers having different surface potentials are formed in a unit cell in a direction parallel to the partition walls of the cells. Provide a display panel.

2 is a schematic diagram showing the structure of the green phosphor layer according to the first embodiment, wherein A and B represent different green phosphor layers.

Two kinds of green phosphor materials which can be used for the green phosphor layer structure according to the first embodiment are Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is an alkaline earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (an integer from a = 1 to 23), MgAl _x O _y : Mn (an integer from x = 1 to 10, an integer from y = 1 to 30), LaMgAl _x O _y : Tb (an integer from x = 1 to 14, an integer from y = 8 to 47), and ReBO ₃ : Tb (Re is a rare earth element selected from at least one selected from the group consisting of Sc, Y, La, Ce, and Gd). And Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is alkaline earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn. (a = an integer from 1 to 23), and MgAl _x O _y : Mn (x = 1 to 10, an integer from y = 1 to 30) and LaMgAl _x O _y : Tb ( x = an integer from 1 to 14, y = an integer from 8 to 47), and ReBO ₃ : Tb (Re is at least one rare earth selected from the group consisting of Sc, Y, La, Ce, and Gd) 1 type selected from the group consisting of an element) can be used.

According to a second preferred embodiment of the present invention, the present invention includes a secondary partition wall installed in a direction parallel to the partition wall in the center of the bottom of the inside of the unit cell, and is different from the bottom surface and the partition wall inside the unit cell by the auxiliary partition wall Provided is a plasma display panel in which two kinds of green phosphor layers having surface potentials are bisected in a direction parallel to a cell partition wall. In the phosphor layer according to the second sphere, the phosphor forming method of the first sphere example may be applied in the same manner.

FIG. 3 is a schematic diagram showing the structure of the green phosphor layer of the second embodiment, and in FIG. 3, A and B represent different green phosphor layers. The height of the auxiliary partition wall which is preferable in the second embodiment is 50% or less of the partition height, and preferably has a height of 5 to 30% of the partition height.

In the second embodiment, the auxiliary wall is used to improve defects caused by overflow of any one of the fluorescent layers, and the auxiliary partition wall may be formed at the time of manufacture of the partition wall, and may be formed in a plasma display panel having a wire electrode structure. It may also be fabricated by covering the dielectric material with an address electrode. In addition, the dielectric material may be manufactured with a stepped portion to serve as a secondary bulkhead.

Two kinds of green phosphor materials usable in the green phosphor layer structure of the second embodiment are Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is alkaline earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (an integer from a = 1 to 23), MgAl _x O _y : Mn (an integer from x = 1 to 10, an integer from y = 1 to 30), LaMgAl _x O _y : Tb (x = An integer from 1 to 14, y = an integer from 8 to 47), and ReBO ₃ : Tb (Re is a rare earth element selected from at least one selected from the group consisting of Sc, Y, La, Ce, and Gd). More preferably Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is an alkaline earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (a = An integer from 1 to 23), and MgAl _x O _y : Mn (x = an integer from 1 to 10, an integer from y = 1 to 30) and LaMgAl _x O _y : Tb (x = An integer from 1 to 14, an integer from y = 8 to 47), and ReBO ₃ : Tb (Re is at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, and Gd) One selected from the group consisting of can be used.

According to a third preferred embodiment of the present invention, the present invention provides a first phosphor layer having a first green phosphor coated on a bottom and a partition wall inside a unit cell, and a second green phosphor coated on the first phosphor layer. A plasma display panel including a second phosphor layer is provided.

The phosphor layer according to the third embodiment can be prepared by preparing a slurry including respective phosphor materials and sequentially applying the first phosphor layer and the second phosphor layer. The thickness of the first phosphor layer is preferably thicker than that of the second phosphor layer, and more preferably 5 to 20 μm. In addition, the thickness of the second phosphor layer is preferably 1 to 10 μm, and more preferably the thickness of one phosphor powder.

4 is a schematic diagram showing the green phosphor layer structure of the third embodiment, in which A represents the first phosphor layer, and B represents the second phosphor layer.

The green phosphor material usable in the green phosphor layer structure of the third embodiment is Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is alkaline earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (a = integer from 1 to 23), MgAl _x O _y : Mn (x = integer from 1 to 10, y = integer from 1 to 30), LaMgAl _x O _y : Tb (x = 1 to An integer of 14, an integer of y = 8 to 47), and ReBO ₃ : Tb (Re is a rare earth element selected from at least one selected from the group consisting of Sc, Y, La, Ce, and Gd). More preferably, the first green phosphor (A in FIG. 4) forming the first phosphor layer is Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is an alkaline earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (an integer from a = 1 to 23), and MgAl _x O _y : Mn (an integer from x = 1 to 10, an integer from y = 1 to 30) It can be selected from the group consisting of, the second green phosphor (B in Fig. 4) forming the second phosphor layer is LaMgAl _x O _y : Tb (x = 1 To an integer from 14 to y, an integer from y to 8 to 47), and ReBO ₃ : Tb (Re is a rare earth element selected from the group consisting of Sc, Y, La, Ce, and Gd). Can be used.

According to a fourth preferred embodiment of the present invention, the present invention includes a bottom phosphor layer on which a first green phosphor is coated on a bottom surface of a unit cell, and second and third green phosphors are formed on both partition walls, respectively. Provided is a plasma display panel including a partition phosphor layer coated thereon. FIG. 5 is a schematic diagram showing the green phosphor layer structure of the fourth embodiment, in which A is the first green phosphor forming the bottom phosphor layer, and B is the second green applied to the partition to form the partition phosphor layer. Phosphor, C denotes a third green phosphor that is applied to the partition to form the partition phosphor layer.

The green phosphor material usable in the green phosphor layer structure of the fourth embodiment is Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is alkaline earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (a = integer from 1 to 23), MgAl _x O _y : Mn (x = integer from 1 to 10, y = integer from 1 to 30), LaMgAl _x O _y : Tb (x = 1 to An integer of 14, an integer of y = 8 to 47), and ReBO ₃ : Tb (Re is a rare earth element selected from at least one selected from the group consisting of Sc, Y, La, Ce, and Gd). More preferably, the first green phosphor (A in FIG. 5) forming the bottom phosphor layer is at least one of ReBO ₃ : Tb (Re is Sc, Y, La, Ce, and Gd). Rare earth metal selected above may be used, and the second green phosphor (B in FIG. 5) constituting the barrier layer is Zn ₂ SiO ₄ : Mn, and (Zn, A) ₂ SiO ₄ : Mn (A is Alkaline earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (an integer from a = 1 to 23), MgAl _x O _y : Mn (x = 1 to 10 integer, y = 1 to 30), and LaMgAl _x O _y : Tb (x = 1 to 14 integer, y = 8 to 47) The third green phosphor (C in FIG. 5) constituting the partition phosphor layer may be selected from the group consisting of Zn ₂ SiO ₄ : Mn, and (Zn, A) ₂ SiO ₄ : Mn (A is alkali. Earth metal), (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (an integer from a = 1 to 23), MgAl _x O _y : Mn (an integer from x = 1 to 10, an integer from y = 1 to 30) ), And LaMgAl _x O _y : Tb (an integer of x = 1 to 14 and an integer of y = 8 to 47). The second green phosphor and the third green phosphor may use the same or different green phosphors.

The green phosphor layer of the present invention can be formed using a conventional phosphor layer forming method.

It is preferable to manufacture the fluorescent substance layer of a 1st specific example and a 2nd specific example using the dispenser method. By dispensing the dispenser nozzle along the left and right partition walls of the discharge space, the phosphor slurry flows through the partition walls, thereby forming another phosphor layer on the left and right partition walls. By spraying two nozzles simultaneously using the dispenser method, an even proportion of the fluorescent layer can be formed. In addition, the ratio of the two phosphor layers can be adjusted by giving a second injection time after the first injection. The proportion of the phosphor layer can also be controlled by the viscosity and amount of the slurry and the amount of the phosphor solid content.

It is preferable that the phosphor layer according to the third and fourth embodiments of the present invention is formed by using a screen printing method and a dispenser method together.

However, the method of forming the phosphor layer of the present invention is not limited to the above methods.

One of the two green phosphors used in the green phosphor layer structure according to the first to fourth embodiments is preferably used in an amount of 20 to 80% by weight. When using three green phosphors, it is preferable to adjust the content of each phosphor to 10 to 60% by weight.

In addition to the green phosphor structure of the preferred 1 to 4 embodiments, two or more green phosphors having different surface potentials are not mixed in one unit cell, and are separated from each other to form separate green phosphor layers, thereby providing excellent discharge stability and lifetime characteristics. Can be obtained.

Hereinafter, preferred embodiments of the present invention are described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.

Example 1

Ethyl cellulose, a binder, was mixed in a 3: 7 mixed solvent of butylcarbitol acetate and terpineol, and then Zn ₂ SiO ₄ : Mn, which is a green phosphor, and YBO ₃ : Tb, which was another green phosphor, were respectively added to the mixed solvent. Zn ₂ SiO ₄ : Mn slurry and YBO ₃ : Tb slurry were prepared to have a viscosity of about 16 Pa · s by addition.

The green phosphor layer of FIG. 2 was manufactured by aligning the dispenser nozzles to the left and right partition walls, and simultaneously spraying the slurry with two nozzles so that the phosphor slurry flows through the partition walls.

Example 2

A green phosphor layer was manufactured in the same manner as in Example 1, except that a substrate provided with an auxiliary partition having a height of 30% of a partition at the bottom center of the unit cell was used.

Example 3

Ethyl cellulose, a binder, was mixed in a 3: 7 mixed solvent of butylcarbitol acetate and terpineol, and then Zn ₂ SiO ₄ : Mn, which is a green phosphor, and YBO ₃ : Tb, which was another green phosphor, were respectively added to the mixed solvent. By addition, a Zn ₂ SiO ₄ : Mn slurry and a YBO ₃ : Tb slurry were prepared separately. The prepared Zn ₂ SiO ₄ : Mn slurry was applied to the bottom and partition walls of the unit cell to have a thickness of about 10 μm to form a first phosphor layer, and a YBO ₃ : Tb slurry was applied thereon to about 5 μm. By forming the second phosphor layer, a green phosphor layer of the form as shown in FIG. 4 was manufactured.

Example 4

Ethyl cellulose, a binder, was mixed with a mixed solvent of butylcarbitol acetate and terpineol in a weight ratio of 3: 7, and the first green phosphor Zn ₂ SiO ₄ : Mn and the second green phosphor YBO ₃ : Tb and the third green phosphor BaO Al ₂ O ₃ : Mn was added to the mixed solvent, respectively, to prepare a Zn ₂ SiO ₄ : Mn slurry, a YBO ₃ : Tb slurry, and a BaO.Al ₂ O ₃ : Mn slurry. The prepared Zn ₂ SiO ₄ : Mn slurry was applied to the bottom of the unit cell to have a thickness of about 10 μm to form a first phosphor layer, on which YBO ₃ : Tb slurry and Zn ₂ SiO ₄ : Mn slurry were deposited. The second phosphor layer and the third phosphor layer were formed by using a dispenser method with different nozzles, respectively, to form a green phosphor layer as shown in FIG. 5.

Comparative Example 1

Using only Zn ₂ SiO ₄ : Mn as a green phosphor, a slurry was prepared in the same manner as in Example 1, and a green phosphor layer was prepared to have a thickness of about 15 μm in a unit cell.

Comparative Example 2

A green phosphor layer was manufactured in the same manner as in Comparative Example 1 except that only YBO ₃ : Tb was used as the green phosphor.

Comparative Example 3

A green phosphor layer was prepared in the same manner as in Comparative Example 1, except that Zn ₂ SiO ₄ : Mn and YBO ₃ : Tb, which were green phosphors, were uniformly mixed in a weight ratio of 1: 1.

The lifespan characteristics of the green phosphor layers of Examples 1 to 4 and Comparative Examples 1 to 3 were measured to evaluate life characteristics, and the results are shown in Table 1 below.

TABLE 1

Initial luminance (cd / m ² ) % Luminance Over Time 0 hours 95 hours 160 hours 280 hours 475 hours 650 hours Example 1 190 99 100 101 99 99 97 Example 2 183.6 100 101 101 98 98 96 Example 3 187.7 100 99 100 99 98 97 Example 4 177.2 100 99 99 98 97 96 Comparative Example 1 181.3 100 99 99 99 98 98 Comparative Example 2 181.7 100 99 101 102 100 99 Comparative Example 3 173 100 97 93 91 89 88

As can be seen in Table 1, Examples 1 to 3 of the present invention have excellent initial luminance compared to Comparative Examples 1 to 3, and excellent luminance compared to Comparative Example 3 used by mixing two kinds of phosphors even after 650 hours. It can be seen that the life characteristics are excellent because of the retention rate.

In addition, the discharge stability of the display panel including the green phosphor layers of Examples 1 to 4 and Comparative Examples 1 to 3 was evaluated using the address delay, and the results are shown in Table 2.

TABLE 2

CIE X CIE Y Discharge Deviation (Va = 70V) Example 1 0.281 0.665 181 Example 2 0.274 0.670 198 Example 3 0.276 0.672 167 Example 4 0.269 0.677 209 Comparative Example 1 0.244 0.704 > 400 Comparative Example 2 0.333 0.611 122 Comparative Example 3 0.280 0.668 260

In Table 2, Va is the address voltage, and the discharge deviation is for evaluating the discharge stability, and the discharge deviation was calculated by the following equation.

Nt / No = exp ((-t-t _f ) / t _s )

In the above formula, Nt is the number of discharge misses in which no discharge occurs at t time, No is the discharge delay time measurement count, t _f is the formation delay time, and t _s is the discharge deviation.

As shown in Table 2, it can be seen that the discharge deviation of Example 1 is significantly reduced compared to Comparative Example 3 when the address voltage is 70V. If the discharge deviation is large, the discharge does not start at a certain time, which means that the display quality is deteriorated. Therefore, it can be confirmed that discharge stability of Example 1 is superior to Comparative Example 3. In Comparative Example 2, the discharge safety is similar to those of Examples 1 to 3, but in this case, it is difficult to apply to the plasma display panel due to the deterioration of the color purity quality.

In addition, as can be seen in Table 2, it can be seen that Example 3 of the present invention shows excellent discharge stability compared to Comparative Examples 1 and 2 using green phosphors, respectively.

Therefore, it can be seen that the plasma display panel having the green phosphor layer structure according to the present invention has better discharge stability than when the green phosphors are used alone, and has better life characteristics than when the green phosphors are mixed with each other. .

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP) having a green phosphor layer structure having excellent discharge stability and longevity characteristics. The present invention relates to a green phosphor alone, in which two or more different green phosphors are not mixed in a unit cell. Its discharge stability is better than that of its use, and its service life is better than that of the homogeneous mixing of green phosphors.

Claims (16)

A plasma display panel in which green phosphors having different surface potentials are not mixed in a unit cell to form separate green phosphor layers. 2. The plasma display panel of claim 1, wherein the plasma display panel is formed by dividing two kinds of green phosphor layers having different surface potentials in a unit cell in a direction parallel to the partition walls of the cells. The plasma display panel of claim 1, wherein the plasma display panel includes an auxiliary partition wall disposed in a direction parallel to the partition wall at the center of the bottom of the unit cell, and the two green panels have different surface potentials inside the unit cell by the auxiliary partition wall. A plasma display panel in which a phosphor layer is bisected in a direction parallel to a cell partition wall. The plasma display panel of claim 1, wherein the plasma display panel comprises: a first phosphor layer coated with a first green phosphor on a bottom and a partition wall of a unit cell, and a second green phosphor coated on the first phosphor layer; A plasma display panel comprising a two phosphor layer. The plasma display panel of claim 1, wherein the plasma display panel includes a bottom phosphor layer on which a first green phosphor is coated on a bottom surface of a unit cell, and second and third green phosphors are coated on both partition walls, respectively. A plasma display panel comprising a barrier phosphor layer. The plasma display panel of claim 3, wherein the height of the auxiliary barrier rib is 50% or less of the height of the barrier rib. The plasma display panel of claim 3, wherein the height of the auxiliary barrier rib is 5 to 30% of the height of the barrier rib. The plasma display panel of claim 4, wherein the first phosphor layer has a thickness of 5 to 20 μm. The plasma display panel of claim 4, wherein the second phosphor layer has a thickness of 1 to 10 μm. The green phosphor according to any one of claims 1 to 5, wherein the green phosphor is Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is an alkaline earth metal), (BaSrMg) O.aAl ₂ O. ₃ : Mn (an integer from a = 1 to 23), MgAl _x O _y : Mn (an integer from x = 1 to 10, an integer from y = 1 to 30), LaMgAl _x O _y : Tb (x = from 1 to 14) An integer, an integer from y = 8 to 47), and ReBO ₃ : Tb (Re is a rare earth element selected from at least one selected from the group consisting of Sc, Y, La, Ce, and Gd), Wherein the selected green phosphor has different surface potentials. The method of claim 2 or 3, wherein the two kinds of green phosphor layers are Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is alkaline earth metal), (BaSrMg) O.aAl ₂ O ₃ : Mn (an integer from a = 1 to 23), and MgAl _x O _y : Mn (an integer from x = 1 to 10, an integer from y = 1 to 30) and LaMgAl _x O _y selected from the group consisting of : Tb (an integer from x = 1 to 14, an integer from y = 8 to 47), and ReBO ₃ : Tb (Re is a rare earth element selected from at least one selected from the group consisting of Sc, Y, La, Ce, and Gd) Plasma display panel comprising one type selected from the group consisting of. The method of claim 4, wherein the first green phosphor to form the first phosphor layer is Zn ₂ SiO ₄ : Mn, (Zn, A) ₂ SiO ₄ : Mn (A is alkaline earth metal), (BaSrMg) O.aAl A plasma display panel selected from the group consisting of ₂ O ₃ : Mn (an integer from a = 1 to 23), and MgAl _x O _y : Mn (an integer from x = 1 to 10, an integer from y = 1 to 30). The method of claim 4, wherein the second green phosphor forming the second phosphor layer is LaMgAl _x O _y : Tb (an integer of x = 1 to 14, an integer of y = 8 to 47), and ReBO ₃ : Tb ( Re is a plasma display panel selected from the group consisting of at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, and Gd. The plasma of claim 5, wherein the first green phosphor forming the bottom phosphor layer is ReBO ₃ : Tb (Re is a rare earth metal selected from the group consisting of Sc, Y, La, Ce, and Gd). Display panel. 6. The second green phosphor forming the barrier layer is formed of Zn ₂ SiO ₄ : Mn, and (Zn, A) ₂ SiO ₄ : Mn (A is an alkaline earth metal), (BaSrMg) O.aAl. ₂ O ₃ : Mn (a = 1 to 23), MgAl _x O _y : Mn (x = 1 to 10, y = 1 to 30), and LaMgAl _x O _y : Tb (x = 1 To an integer of 14 to 14, and an integer of y to 8 to 47). The third green phosphor of claim 5, wherein the third phosphor forms Zn ₂ SiO ₄ : Mn, and (Zn, A) ₂ SiO ₄ : Mn (A is an alkaline earth metal), (BaSrMg) O.aAl. ₂ O ₃ : Mn (a = 1 to 23), MgAl _x O _y : Mn (x = 1 to 10, y = 1 to 30), and LaMgAl _x O _y : Tb (x = 1 And an integer of y to 8 to 47), wherein the plasma display panel is the same or different green phosphor as the second green phosphor.

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