KR20060088400A - Red phosphor and plasma display panel having same - Google Patents

Abstract

The present invention relates to a red phosphor and a plasma display panel having the same.

The red phosphor according to the present invention is characterized in that the YBO ₃ : Eu phosphor is formed by mixing 0 wt% to 50 wt%, and the Y ₂ O ₃ : Eu phosphor is mixed at 0 wt% to 50 wt%.

Description

Red phosphor and plasma display panel including the same {Red phosphor and plasma display panel including the same}             

1 is a view showing the structure of a three-electrode surface discharge plasma display panel.

2 is a view showing a luminance maintenance rate of each phosphor according to an embodiment of the present invention.

3 is a diagram illustrating luminance characteristics of a CMS phosphor according to an exemplary embodiment of the present invention.

4 is a view showing the accelerated life characteristics of the CMS phosphor according to an embodiment of the present invention.

5 is a diagram illustrating luminance / efficiency characteristics of a BAM (Sr) phosphor according to an exemplary embodiment of the present invention.

6 is a view showing the characteristics of the color purity, luminance, lifetime and discharge voltage of the phosphor according to an embodiment of the present invention.

The present invention relates to a red phosphor and a plasma display panel having the same, and more particularly, to a red phosphor and a plasma display panel having the same capable of improving luminance characteristics.

Plasma display panels are in the spotlight as next generation display devices having the highest practicality among flat panel display devices. That is, the plasma display panel has high brightness and a wide viewing angle, and thus has wide applicability as a large, thin display such as an outdoor advertising tower, a wall-mounted TV, or a theater display.

In general, a plasma display panel displays an image using visible light emitted by irradiating ultraviolet light generated by a discharge of an inert gas enclosed in a discharge cell to a phosphor.

A typical plasma display panel includes a scan electrode and a common electrode formed on an upper substrate, and a data electrode formed on a lower substrate. In this case, the scan electrode and the common electrode are formed in a direction crossing the data electrode. The scan electrode and the common electrode are formed of one electrode pair, and a plurality of such electrode pairs are arranged on the panel.

In addition, the upper dielectric layer and the passivation layer are sequentially stacked on the upper substrate, the lower dielectric layer and the barrier rib are formed on the lower substrate, and the phosphor is coated on the lower dielectric layer and the barrier rib surface to form the phosphor layer. One discharge cell is formed from a point where the scan electrode, the common electrode, and the data electrode cross each other.

Here, the phosphor may be composed of a red phosphor, a green phosphor, and a blue phosphor, and each phosphor is applied along an inner wall of each partition wall. For example, YBO ₃ : Eu phosphor is used as the red phosphor, Zn ₂ SiO ₄ : Mn phosphor is used as the green phosphor, and BaMgAl ₁₀ O ₁₇ : Eu (hereinafter referred to as BAM) is used as the blue phosphor. Can be used.

However, YBO ₃ : Eu phosphor used as a red phosphor has very poor color purity. Therefore, there is an urgent need to develop a red phosphor having good color purity in place of the YBO ₃ : Eu phosphor.

Accordingly, an object of the present invention is to provide a red phosphor capable of improving color purity characteristics.

Another object of the present invention is to provide a plasma display panel using the red phosphor.

In order to achieve the above object, the red phosphor according to the present invention is mixed with more than 0% to 50% by weight of YBO ₃ : Eu phosphor and more than 0% to 50% by weight of Y ₂ O ₃ : Eu phosphor It is characterized by being formed.

The red phosphor according to the present invention is formed by mixing a first type phosphor of YBO ₃ : Eu phosphor and at least two phosphors of Y (P, V) O ₄ : Eu phosphor, Y ₂ O ₃ : Eu phosphor and YAB phosphor More than 0 wt% to 90 wt% of the YBO ₃ : Eu phosphor, and more than 0 wt% to 90 wt% of the Y (P, V) O ₄ : Eu phosphor; The Y ₂ O ₃ : Eu phosphor is more than 0% by weight to 90% by weight, and the YAB phosphor is characterized by being formed from more than 0% by weight to 90% by weight or less.

The first type phosphor, the second type phosphor of the Y (P, V) O ₄ : Eu phosphor, and the third type phosphor of the YAB phosphor are formed by mixing.

The first type phosphor, the second type phosphor of the Y (P, V) O ₄ : Eu phosphor, and the third type phosphor of the Y ₂ O ₃ : Eu phosphor are mixed and formed.

According to the present invention, a plasma display panel includes: a plurality of electrodes arranged on a top substrate by forming a pair of first and second sustain electrodes; A plurality of data electrodes arranged on a lower substrate to intersect the plurality of electrodes; A plurality of partition walls arranged side by side with the plurality of data electrodes to have a constant gap to form a discharge space between the upper substrate and the lower substrate; And a plurality of phosphor layers including a red phosphor layer, a green phosphor layer, and a blue phosphor layer formed along the inner walls of the plurality of partition walls, wherein the red phosphor layer is a first type phosphor of YBO ₃ : Eu phosphor, and Y And (P, V) O ₄ : Eu phosphor, Y ₂ O ₃ : Eu phosphor, and at least one phosphor of YAB phosphor.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described.

1 is a view showing the structure of a three-electrode surface discharge plasma display panel.

Referring to FIG. 1, a typical plasma display panel includes a scan electrode 2Y and a common electrode 2Z formed on the upper substrate 1, and a data electrode 6X formed on the lower substrate 5. . In this case, the scan electrode 2Y and the common electrode 2Z are formed in a direction crossing the data electrode 6X. The scan electrode 2Y and the common electrode 2Z are formed of one electrode pair, and a plurality of such electrode pairs are arranged on the panel.

In addition, an upper dielectric layer 3 and a protective film 4 are sequentially stacked on the upper substrate 1, and a lower dielectric layer 7 and a partition wall 8 are formed on the lower substrate 5, and the lower dielectric layer 7 and the partition wall are formed. (8) A phosphor is coated on the surface to form a phosphor layer 9. One discharge cell is formed from a point where the scan electrode 2Y, the common electrode 2Z, and the data electrode 6X cross each other.

Here, the phosphor may be composed of a red phosphor, a green phosphor and a blue phosphor, and each phosphor is applied along the inner wall of each partition 8.

Here, in order to solve various problems of the YBO ₃ : Eu phosphor, which is a red phosphor, the first type phosphor of YBO ₃ : Eu and the second type phosphor of Y (P, V) O ₄ : Eu are mixed. A red phosphor is embodied as the first mixed phosphor, and the first kind of phosphor of YBO ₃ : Eu, the second kind of phosphor of Y (P, V) O ₄ : Eu, and the third kind of Y ₂ O ₃ : Eu A red phosphor is embodied as a second mixed phosphor in which phosphors are mixed, and a first phosphor of YBO ₃ : Eu, a fourth phosphor of YAB, and a _third phosphor of Y ₂ O ₃ : Eu are mixed. A red phosphor is implemented as the third mixed phosphor.

Different luminance retention ratios were obtained for the acceleration time of YBO ₃ : Eu phosphor selected as type 1 phosphor and Y (P, V) O ₄ : Eu phosphor selected as type ₂ phosphor and Y ₂ O ₃ : Eu selected as type 3 phosphor. The results of the experiment on the color coordinate change according to each content are shown in FIGS. 2 to 6.

FIG. 2 is a graph illustrating luminance retention rates according to acceleration times of a first type phosphor, a second type phosphor, and a third type phosphor. FIG.

Referring to FIG. 2, in the red phosphor according to an exemplary embodiment of the present invention, the luminance maintaining ratio shows a high luminance maintaining ratio in the order of YBO ₃ > Y (V, P) O ₄ > Y ₂ O ₃ . In detail, YBO ₃ hardly exhibits a change in luminance maintenance rate during the entire acceleration time and appears to maintain the initial luminance maintenance rate. Y (V, P) O ₄ maintains the initial luminance maintenance rate without changing the luminance maintenance rate during the initial 100 (hr) acceleration time, and gradually decreases from 100% luminance maintenance rate to 96% luminance maintenance rate after 100 (hr) acceleration time. Done. Y ₂ O ₃ decreases from 100% luminance maintenance rate to approximately 92% luminance maintenance rate during the initial 24 (hr) acceleration time, and thereafter, little change in luminance maintenance rate is observed during the remaining acceleration time.

FIG. 3 is a graph showing luminance maintenance characteristics of a red phosphor formed by mixing YBO ₃ and Y (V, P) O _{4 in} a ratio of 5: 5.

Referring to FIG. 3, in the characteristic of the first mixed phosphor having a content of YBO ₃ and Y (V, P) O ₄ of 5: 5, the luminance retention of red almost varies from the initial acceleration time to approximately 1500 (hr). While maintaining the initial luminance maintenance rate, the reduction rate is approximately 95% from the acceleration time of 1500 (hr) to 2000 (hr). The luminance maintenance rate of white decreases linearly from the initial luminance maintenance rate to the 86% luminance maintenance rate from the initial acceleration time to 300 (hr) acceleration time, and then shows the 86% luminance maintenance rate without changing the luminance maintenance rate until the 500 (hr) acceleration time. After 500 (hr) acceleration time, it gradually decreases, and it shows 77% luminance maintenance rate at 2000 (hr) acceleration time. Green and blue decreased from the initial acceleration time to the acceleration time of 24 (hr) to approximately 90% at the initial luminance maintenance rate, and then maintained at around 90% luminance until the 1500 (hr) acceleration time and then accelerated to 1500 (hr). After time, it gradually decreases. As a result, it can be seen that the first mixed phosphor according to the embodiment of the present invention improves the luminance retention characteristic of red.

4 is a view showing a change in color coordinates according to the content of Y (V, P) O ₄ in YBO ₃ of the first type phosphor in the red phosphor according to an embodiment of the present invention.

Referring to FIG. 4, in the red phosphor according to the embodiment of the present invention, the content of Y (V, P) O ₄ is increased from 0% to 100% by weight so that the color coordinate moves in the direction of high red purity. do.

FIG. 5 is a view showing luminance variation according to Y (V, P) O ₄ content in YBO ₃ , which is a first type phosphor, in a red phosphor according to an exemplary embodiment of the present invention.

Referring to FIG. 5, in the red phosphor according to the embodiment of the present invention, the luminance characteristic is gradually decreased as the content of Y (V, P) O ₄ increases. In detail, when the content of Y (V, P) O ₄ is 100% of the luminance characteristic at 0% by weight, the content of Y (V, P) O ₄ is 80% at 50% by weight. When the content of Y (V, P) O ₄ is 100%, the luminance is about 63%.

As a result, as shown in FIG. 6, in the red phosphor according to the embodiment of the present invention, color purity is improved by appropriately adjusting the content of Y (V, P) O ₄ , and the luminance characteristic of YBO ₃ is maintained.

Accordingly, in the first mixed phosphor according to the embodiment of the present invention, the first type phosphor of YBO ₃ : Eu and the second type phosphor of Y (P, V) O ₄ : Eu are 0 to 50% by weight, respectively. It can be mixed at a ratio of -50% by weight to implement a red phosphor. In the second mixed phosphor according to the embodiment of the present invention, the first type phosphor of YBO ₃ : Eu is 0 wt% to 90 wt%, and the second type phosphor of Y (P, V) O ₄ : Eu is 0. From ₃ % by weight to 90% by weight, phosphors of type _{3 of} Y ₂ O ₃ : Eu are mixed in the range of 0% to 90% by weight to form 100% by weight of the type 1 to type 3 phosphors as a whole. Will be implemented. In the third mixed phosphor according to the embodiment of the present invention, the first type phosphor of YBO ₃ : Eu is 0% to 90% by weight, and the second type phosphor of Y (P, V) O ₄ : Eu is 0. From 5% by weight to 90% by weight, the fourth type phosphor of YAB is mixed in the range of 0% by weight to 90% by weight to form a total of 100% by weight of the first type phosphor, the second type phosphor and the fourth type phosphor. Will be implemented.

As described above, the red phosphor and the plasma display panel according to the embodiment of the present invention, the red phosphor is YBO ₃ : Eu phosphor, Y (P, V) O ₄ : Eu phosphor, Y ₂ O ₃ : Eu phosphor and YAB phosphor While mixing, the combination ratio of each phosphor in the range of 0% to 90% by weight can maintain the luminance characteristics and improve the color purity.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (5)

A red phosphor, wherein the YBO ₃ : Eu phosphor is formed by mixing more than 0% by weight to 50% by weight and the Y ₂ O ₃ : Eu phosphor is mixed by more than 0% by weight and 50% by weight or less. The first type phosphor of the YBO ₃ : Eu phosphor, At least two phosphors of Y (P, V) O ₄ : Eu phosphor, Y ₂ O ₃ : Eu phosphor, and YAB phosphor are mixed and formed; The YBO ₃ : Eu phosphor is more than 0% by weight or less than 90% by weight, The Y (P, V) O ₄ : E phosphor is 0 wt% to 90 wt% or less, The Y ₂ O ₃ : Eu phosphor is 0 wt% to 90 wt% or less, The red phosphor of the YAB phosphor is formed in more than 0% by weight or less than 90% by weight. The method of claim 2, The first type phosphor, The second type phosphor of the Y (P, V) O ₄ : Eu phosphor, The red phosphor of claim 3, wherein the phosphor of the third type of the YAB phosphor is mixed. The method of claim 2, The first type phosphor, The second type phosphor of the Y (P, V) O ₄ : Eu phosphor, The red phosphor of claim 3, wherein the third phosphor of the Y ₂ O ₃ : Eu phosphor is mixed and formed. A plurality of electrodes arranged on the upper substrate by forming a pair of first and second sustain electrodes; A plurality of data electrodes arranged on a lower substrate to intersect the plurality of electrodes; A plurality of partition walls arranged side by side with the plurality of data electrodes to have a constant gap to form a discharge space between the upper substrate and the lower substrate; A plurality of phosphor layers including a red phosphor layer, a green phosphor layer, and a blue phosphor layer formed along inner walls of the plurality of partition walls, The red phosphor layer is formed by mixing a first type phosphor of YBO ₃ : Eu phosphor and at least one phosphor of Y (P, V) O ₄ : Eu phosphor, Y ₂ O ₃ : Eu phosphor, and YAB phosphor. Characterized in that the plasma display panel.

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