JPWO2007063577A1 - Plasma display panel - Google Patents

Abstract

A red phosphor composed of a mixture of (Y, Gd) PVO4: Eu and (Y, Gd) BO3: Eu, a green phosphor composed of Zn2SiO4: Mn, a blue phosphor, and an absorption in the wavelength region of 570 to 620 nm. In a plasma display panel with a 1/10 afterglow of 8 ms or less having a filter containing a dye having a peak, the emission of the red phosphor when the sum of the luminance of green and red becomes 1/100 of the initial brightness after turning off The difference Δx and Δy of the chromaticity of light combined with the emission of the green phosphor with respect to the initial chromaticity are in a range of −0.08 ≦ Δx ≦ 0.12 and −0.12 ≦ Δy ≦ 0.08, respectively. Is a plasma display panel.

Description

  The present invention relates to a plasma display panel.

(Y, Gd) BO ₃ : Eu, which is a red phosphor, has high luminance and little luminance deterioration due to long-time lighting of the panel, and is mainly used in current plasma display panels (PDP). However, this phosphor has a long 1/10 afterglow time (indicating the time until the luminance is attenuated to 1/10) of about 10 ms. On the other hand, Y ₂ O ₃ : Eu and (Y, Gd) PVO ₄ : Eu, which are red phosphors, have a short 1/10 afterglow time of about 3.5 ms. However, these phosphors have a low luminance, and the latter has a problem that the luminance is greatly deteriorated by lighting the panel for a long time. This problem has been improved and is approaching a practical level. For any red phosphor, adjustment of 1/10 afterglow time by changing the composition of constituent elements has not been reported. In addition, said composition formula also represents the case where Gd is not contained.

Zn ₂ SiO ₄ : Mn, which is a green phosphor, is mainly used in current PDPs because it has high luminance and good chromaticity. The 1/10 afterglow time of this phosphor can be adjusted by adjusting the Mn concentration. It is known that increasing the Mn concentration shortens the 1/10 afterglow time, but at the same time decreases the brightness and accelerates the deterioration of the brightness. Therefore, the limit of 1/10 afterglow time within the practical range is about 6 ms. Further, (Y, Gd) BO ₃ : Tb having good driving characteristics is also used as the green phosphor, and the 1/10 afterglow time is about 10 ms.
Since the blue phosphor mainly used for PDP has a very short 1/10 afterglow time of 1 ms or less, it is not necessary to further shorten the 1/10 afterglow time at this time.

From the above, red and green stand out in the PDP afterglow. In the conventional PDP, (Y, Gd) BO ₃ : Eu having a 1/10 afterglow time of about 10 ms is used as a red phosphor, and Zn ₂ SiO having a 1/10 afterglow time of 8 to 10 ms is used as a green phosphor. ₄ : Mn is used. Therefore, for example, when a white ball moves in a video of a soccer game or when a white subtitle scrolls on a black background in a movie or the like, there is a problem that a yellow tail due to afterglow is visible.

In order to shorten the tailing due to the afterglow of the phosphor, the afterglow of both red and green was shortened as much as possible (for example, (Y, Gd) with a 1/10 afterglow time of about 3.5 ms as a red phosphor When PVO ₄ : Eu is used and Zn ₂ SiO ₄ : Mn having a 1/10 afterglow time of about 6 ms is used as the green phosphor), the afterglow tailing becomes short. However, the problem was that the afterglow looked green and the tailing was noticeable. This indicates that the tail is less noticeable when the chromaticity difference between the display color and afterglow is smaller.

In order to solve the tailing, there is a method of adjusting the 1/10 afterglow time to 8 ms or less by using a mixture of two kinds of phosphors different from each other in red phosphor and green phosphor (Japanese Patent Laid-Open No. 2003). -142005 gazette-patent document 1).
Japanese Patent Laid-Open No. 2003-142005

  However, it has been found that the method of adjusting the 1/10 afterglow time of green or red by mixing a plurality of phosphors is not sufficient to make the tailing inconspicuous. That is, when two or more kinds of different phosphors are mixed as the green phosphor, each chromaticity is clearly different. Therefore, the chromaticity changes as the afterglow is attenuated due to the difference in each afterglow time. As a result, the problem is that the tail is easily recognized. This was the same in the case of the red phosphor. In particular, the influence of the color change of the green afterglow which shows about 60% of the luminance is large.

  Further, in the above method, it is sufficient to adjust the 1/10 afterglow time at which the emission intensity becomes 1/10, that is, to adjust the afterglow within one frame (16.7 ms for 60 Hz video) from extinguishing. It was thought. However, in practice, it was found that even a strength of 1/100 or less was sufficiently recognized as tailing. That is, it is necessary to consider from the turn-off to the second frame. In particular, when a change in chromaticity occurs during the decay of afterglow as described above, a lower light emission intensity is recognized, so that the tail is visible.

Thus, according to the present invention, a red phosphor composed of a mixture of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu, a green phosphor composed of Zn ₂ SiO ₄ : Mn, and a blue phosphor And a plasma display panel having a 1/10 afterglow of 8 ms or less having a filter containing a dye having an absorption peak in the wavelength region of 570 to 620 nm,
Differences Δx and Δy with respect to the initial chromaticity of the chromaticity of light, which is a combination of the emission of the red phosphor and the emission of the green phosphor when the sum of the luminances of green and red becomes 1/100 of the initial value after the light is turned off. Are provided in the ranges of −0.08 ≦ Δx ≦ 0.12 and −0.12 ≦ Δy ≦ 0.08, respectively.

Furthermore, according to the present invention, a red phosphor composed of a mixture of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu, a green phosphor composed of Zn ₂ SiO ₄ : Mn, and blue In a plasma display panel with 1/10 afterglow of 8 ms or less having a phosphor and a filter having different transmittances for the light emission of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu,
A plasma display panel in which the luminance ratio X of (Y, Gd) PVO ₄ : Eu in the red phosphor and the Mn concentration Y of Zn ₂ SiO ₄ : Mn satisfies the relationship of 65Y-210 ≦ X ≦ 65Y-135. Is provided.

Further, according to the present invention, a red phosphor composed of a mixture of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu, a green phosphor composed of Zn ₂ SiO ₄ : Mn, and blue In a plasma display panel with 1/10 afterglow of 8 ms or less having a phosphor and a filter having different transmittances for the light emission of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu,
The luminance ratio X of (Y, Gd) PVO ₄ : Eu in the red phosphor and the x value Z of the chromaticity of Zn ₂ SiO ₄ : Mn satisfy the relationship of 10400Z−2547 ≦ X ≦ 10400Z−2472. A plasma display panel is provided.

ADVANTAGE OF THE INVENTION According to this invention, the conspicuousness of the tailing by afterglow is reduced, and PDP with the high visibility of a moving image can be provided.
Further, by using a mixture of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu as the red phosphor, the red phosphor (Y, Gd) BO ₃ : Eu which has been greatly different until now. And the green phosphor Zn ₂ SiO ₄ : Mn can be brought closer to the driving voltage characteristics. As a result, the drive margin can be widened and the panel yield can be improved.

It is a schematic perspective view of PDP. It is a graph which shows the relationship between the emitted light intensity for every Mn density | concentration of the green fluorescent substance of an Example, and afterglow time. It is a graph which shows the relationship between the emitted light intensity of the blue fluorescent substance of an Example, and afterglow time. It is a graph which shows the relationship between the emitted light intensity of the red fluorescent substance for every luminance ratio of an Example, and afterglow time. It is a graph which shows the relationship between (DELTA) x and (DELTA) y of an Example. It is a graph which shows the relationship between the Mn density | concentration of an Example, and the ratio of a brightness | luminance. It is a graph which shows the relationship between the Mn density | concentration of an Example, and the ratio of a brightness | luminance. It is a graph which shows the relationship between the Mn density | concentration of an Example, and the ratio of a brightness | luminance. It is a transmission spectrum of the optical filter of an Example.

Explanation of symbols

11, 21 Glass substrate 17, 27 Dielectric layer 18 Protective layer 28 Phosphor layer 29 Partition 41 Transparent electrode 42 Bus electrode 100 PDP
A Address electrode

  The present invention uses, in a plasma display panel, a combination of an optical filter having simple absorption, a red phosphor that can be made substantially the same color using the same, and a single green phosphor that can adjust the afterglow. Thus, these are adjusted to conditions where the color change of the afterglow is not noticeable at a light emission intensity level of 1/100.

As the red phosphor, a mixture of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu is used. This is because when the short wavelength side of the emission of (Y, Gd) BO ₃ : Eu is cut by an absorption dye (having an absorption peak in the wavelength region of 570 to 620 nm), which is now well known as Ne light cut, This is because the chromaticity of light emission is a combination that is substantially the same as (Y, Gd) PVO ₄ : Eu. In this filter, the transmittance for (Y, Gd) PVO ₄ : Eu is always higher than the transmittance for (Y, Gd) BO ₃ : Eu. Another red phosphor with a short afterglow, Y ₂ O ₃ : Eu, is not used because the chromaticity cannot be aligned with a simple filter. In addition, as said red fluorescent substance, the thing of the composition which does not contain Gd is also contained.

As the green phosphor, only Zn ₂ SiO ₄ : Mn capable of adjusting the afterglow by the Mn concentration is used. It is possible to mix different green phosphors and match each chromaticity with a special filter, but it is not used because it impairs green light emission, which is the key to luminance. The present invention includes combining Zn ₂ SiO ₄ : Mn having different Mn concentrations. This is because the difference in chromaticity is minute and a special filter is unnecessary. There is an effect that the luminance is not lowered so much to adjust the afterglow.

The present invention has any of the following conditions based on the combination of the phosphor and the filter described above (in the description of the following conditions, the light emission and luminance are the light emission and intensity of the phosphor through the filter). In addition, only Condition 1 includes Zn ₂ SiO ₄ : Mn mixture).
(1) The difference Δx with respect to the initial chromaticity of the chromaticity of the light combining the light emission of the red phosphor and the light emission of the green phosphor when the sum of the luminances of green and red after turning off becomes 1/100 of the initial value. And Δy are in a range of −0.08 ≦ Δx ≦ 0.12 and −0.12 ≦ Δy ≦ 0.08, respectively.
(2) The luminance ratio X of (Y, Gd) PVO ₄ : Eu in the red phosphor and the Mn concentration Y of Zn ₂ SiO ₄ : Mn satisfy the relationship of 65Y-210 ≦ X ≦ 65Y-135. .
(3) The luminance ratio X of (Y, Gd) PVO ₄ : Eu in the red phosphor and the x value Z of the chromaticity of Zn ₂ SiO ₄ : Mn are 10400Z−2547 ≦ X ≦ 10400Z−2472. Satisfy the relationship.

Condition (1) By setting the difference Δx and Δy between the initial chromaticity and the chromaticity when the luminance becomes 1/100 from the extinction within the above range, the chromaticity changes as the afterglow attenuates. You can make it inconspicuous. As a result, the tailing can be made difficult to be recognized. More preferable ranges of the differences Δx and Δy are ranges of −0.03 ≦ Δx ≦ 0.08 and −0.08 ≦ Δy ≦ 0.03, respectively. One frame is normally 16.7 ms, but the length may be varied according to the desired PDP configuration and driving method.
The blue phosphor is not particularly limited, and any known blue phosphor can be used. Specific examples include BaMgAl ₁₀ O ₁₇ : Eu, CaMgS ₁₂ O ₆ : Eu, and the like.

In addition, it is preferable to adjust each phosphor so that the luminance of each of the red phosphor, the green phosphor, and the blue phosphor becomes 1/100 or less after one frame from turning off.
That is, it is preferable that the 1/100 afterglow time of each color is shorter than the time of one frame. This is probably because the PDP video display is usually switched in one frame, so that a person can hardly recognize it as afterglow.

Further, the luminance ratio X of (Y, Gd) PVO ₄ : Eu in the red phosphor preferably satisfies 35 ≦ X. By satisfying this ratio, a red phosphor having a 1/100 afterglow time shorter than one frame can be obtained.

  The green phosphor can satisfy the above conditions by adjusting the Mn concentration. For example, the concentration of Mn is preferably 3 to 3.5% by weight. Generally used blue phosphors usually satisfy the above conditions.

Condition (2) (Y, Gd) The luminance ratio X of PVO ₄ : Eu and the Mn concentration Y of Zn ₂ SiO ₄ : Mn satisfy the relationship of 65Y-210 ≦ X ≦ 65Y-135. It can be made inconspicuous that the chromaticity changes as the afterglow attenuates. As a result, the tailing can be made difficult to be recognized. A more preferable relationship between the ratio X and the Mn concentration Y is 65Y-195 ≦ X ≦ 65Y-155.

Regarding Condition (3) The luminance ratio X of (Y, Gd) PVO ₄ : Eu and the x value Z of the chromaticity of Zn ₂ SiO ₄ : Mn satisfy the relationship of 10400Z−2547 ≦ X ≦ 10400Z−2472. This makes it less noticeable that the chromaticity changes as the afterglow attenuates. As a result, the tailing can be made difficult to be recognized. A more preferable relationship between the ratio X and the x value Z is 10400Z-2532 ≦ X ≦ 10400Z-2492.

  The red, green and blue phosphors can be formed by a known method. For example, the compounds containing the atoms constituting the phosphors are weighed so as to have a desired molar ratio. These compounds are fired. Next, a phosphor having a predetermined particle diameter can be obtained by pulverizing and classifying the obtained fired body.

  The present invention is not limited to the AC type but may be a DC type, and can be used for any of a reflection type and a transmission type PDP. Hereinafter, the three-electrode AC type surface discharge PDP of FIG. 1 will be described as an example of the PDP of the present invention.

The PDP 100 in FIG. 1 includes a front substrate and a rear substrate.
First, the front substrate is generally formed of a plurality of display electrodes formed on the substrate 11, a dielectric layer 17 formed so as to cover the display electrodes, and the dielectric layer 17 exposed to the discharge space. And a protective layer 18.

The substrate 11 is not particularly limited, and examples thereof include a glass substrate, a quartz glass substrate, and a silicon substrate.
The display electrode is made of a transparent electrode 41 such as ITO. Further, in order to reduce the resistance of the display electrode, a bus electrode (for example, a three-layer structure of Cr / Cu / Cr) 42 may be formed on the transparent electrode 41.

The dielectric layer 17 is formed of a material usually used for PDP. Specifically, it can be formed by applying a paste made of a low melting point glass and a binder on a substrate and baking it.
The protective layer 18 is provided to protect the dielectric layer 17 from damage caused by ion collision caused by discharge during display. The protective layer 18 is made of, for example, MgO, CaO, SrO, BaO or the like.

  Next, the back substrate is generally a plurality of address electrodes A formed on the substrate 21 in a direction crossing the display electrodes, a dielectric layer 27 covering the address electrodes A, and between the adjacent address electrodes A. A plurality of stripe-shaped barrier ribs 29 formed on the dielectric layer 27 and a phosphor layer 28 formed between the barrier ribs 29 including a wall surface.

As the substrate 21 and the dielectric layer 27, the same types as those of the substrate 11 and the dielectric layer 17 constituting the front substrate can be used.
The address electrode A is made of, for example, a metal layer such as Al, Cr, or Cu or a three-layer structure of Cr / Cu / Cr.

  The partition walls 29 can be formed by applying a paste made of a low melting point glass and a binder on the dielectric layer 27, drying, and then cutting by a sandblast method. Further, when a photosensitive resin is used as the binder, it can be formed by baking after exposure and development using a mask having a predetermined shape.

  The formation method of the fluorescent substance layer 28 is not specifically limited, A well-known method is mentioned. For example, the phosphor layer 28 can be formed by applying a paste in which a phosphor is dispersed in a solution in which a binder is dissolved in a solvent, between the partition walls 29 and baking it in an air atmosphere.

Next, the front substrate and the rear substrate are opposed to each other with the electrodes facing inside so that the display electrodes (41, 42) and the address electrodes A are orthogonal to each other, and a space surrounded by the partition walls 29 is filled with a discharge gas. Thus, the PDP 100 can be formed.
In the PDP, a phosphor layer is formed on the barrier rib and dielectric layer on the rear substrate side among the barrier rib, dielectric layer and protective film that define the discharge space. A phosphor layer may also be formed on the protective film.

<Configuration of plasma display panel>
A green phosphor having a Mn concentration of Zn ₂ SiO ₄ : Mn of 2.6%, 2.8%, 2.9%, 3.1%, 3.2%, 3.4% Using. Table 1 shows chromaticity x and y with respect to Mn concentration, and 1/100 afterglow time, and FIG. 2 shows the relationship between emission intensity and afterglow time for each Mn concentration.

  Note that, in the region where the Mn concentration exceeds 3.5%, the afterglow is short, but the luminous efficiency of the phosphor is poor and easily deteriorated. Therefore, in this example, a green phosphor with stable performance is obtained. The upper limit was set to 3.4%, which is the Mn concentration in the obtained region.

As a red phosphor, (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu are mixed, and the mixing ratio (phosphor weight ratio) of (Y, Gd) PVO ₄ : Eu is 0%. 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% were used. Here, the one without Gd was used.

A general BaMgAl ₁₀ O ₁₇ : Eu was used as the blue phosphor. FIG. 3 shows the relationship between the emission intensity of this phosphor and the afterglow time. Light emission within 1 ms is over, and the rest is detector noise.

  The red, green and blue phosphors were obtained by the following method. The compounds containing the atoms constituting the phosphors were weighed so as to have a desired molar ratio. A mixture of these compounds was fired. Next, the obtained fired body was pulverized and classified to obtain a phosphor.

Using these phosphors, a PDP having the following structure was produced.
Configuration of PDP:
Display electrode Transparent electrode width: 280 μm, Bus electrode width 100 μm
Discharge gap between display electrodes 100μm
Dielectric layer thickness 30μm
Partition height 100μm
Partition arrangement pitch 360μm
Discharge gas of Ne-Xe (5%)-He (30%) Gas pressure 450 Torr

The obtained PDP contains a dye having an absorption peak at 500 nm in the emission wavelength region of the red phosphor, and the red phosphor (Y, Gd) BO ₃ : Eu, (Y, Gd) PVO ₄ : Eu, and green Optical filters having luminous transmittances of 29%, 36%, and 38% with respect to the phosphor Zn ₂ SiO ₄ : Mn were attached. The transmission spectrum of the optical filter is shown in FIG.
Thereby, as shown in Table 3, the ratio of the luminance of (Y, Gd) PVO ₄ : Eu to the luminance of the red phosphor is 0%, 8%, 16%, 25%, 34%, 44%, PDPs of 54%, 65%, 76%, 88% and 100% were obtained.

FIG. 4 shows the relationship between the emission intensity of the red phosphor and the afterglow time for each luminance ratio. In FIG. 4, as an example of a conventional PDP, the Mn concentration (wt%) of Zn ₂ SiO ₄ : Mn is about 2.6%, and only (Y, Gd) BO ₃ : Eu is used for the red phosphor. A PDP with 1/10 afterglow 8 to 10 ms is also shown.

<Evaluation method>
Whether the afterglow color is conspicuous in the subjective evaluation shown in Table 3 of five levels of four evaluators (A, B, C, D) in a pattern in which a white block is moved at high speed while the background is black I judged. The length of afterglow tailing was evaluated by the time until the red and green brightness became 1/100 of the initial brightness.

<Result>
The results for all the phosphor combinations are shown in Tables 4 to 9 in the order of the green phosphors (1) to (6) in Table 1.

  (1) From Tables 4 to 9, although there are some differences depending on the evaluator, if the judgment is 3 or more in the subjective evaluation of the color of the afterglow (rounded value of the 4-person judgment average), it can be considered carefully in normal video display It is found that the level is not recognized (preferable range), and if the determination is 4 or more, it is hardly recognized (more preferable range). Focusing on the chromaticity of the afterglow color, as shown in FIG. 5, the difference between the chromaticity and the initial chromaticity when the sum of the luminances of red and green becomes 1/100 of the initial value is expressed by the following equation: It was found that if 1 and 2 were satisfied, the judgment was 3 or more, and if Expressions 3 and 4 were satisfied, the judgment was 4 or more.

(Formula 1) −0.08 ≦ Δx ≦ 0.12
(Formula 2) -0.12 ≦ Δy ≦ 0.08
(Formula 3) -0.03 ≦ Δx ≦ 0.08
(Formula 4) −0.08 ≦ Δy ≦ 0.03
Δx = (chromaticity x when the sum of red and green luminances becomes 1/100 of the initial value) − (initial chromaticity x)
Δy = (chromaticity y when the sum of red and green luminance is 1/100 of the initial value) − (initial chromaticity y)
(2) Furthermore, in order to satisfy the formulas 1 and 2, as shown in FIGS. 6 and 7, the following formula 7 or 8 is required to satisfy the following formula 5 or 6, and formulas 3 and 4. It turns out that it is good to satisfy.
(Formula 5) 65Y-210 ≦ X ≦ 65Y-135
(Formula 6) 10400Z-2547 ≦ X ≦ 10400Z-2472
(Formula 7) 65Y-195 ≦ X ≦ 65Y-155
(Formula 8) 10400Z-2532 ≦ X ≦ 10400Z-2492
X is (Y, Gd) PVO _4: mixing ratio of the luminance of Eu (percentage), Y is Zn ₂ SiO _4: Mn concentration of Mn (wt%), Z is Zn ₂ SiO _4: emission color chromaticity of Mn x is shown.

  (3) The intensity of afterglow could be recognized even when the luminance was 1/100 or less of the initial value, but from 16.7 ms per frame while satisfying Equation 5 or 6 (more preferably Equation 7 or Equation 8). When the brightness was attenuated to 1/100 or less in a short time, the afterglow was hardly recognized. This is considered to be because the sensitivity level of afterglow is lowered when there is no color change. Specifically, afterglow is hardly recognized in the range shown in FIG.

Claims (7)

A red phosphor composed of a mixture of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu, a green phosphor composed of Zn ₂ SiO ₄ : Mn, a blue phosphor, and 570 to 620 nm In a plasma display panel having a 1/10 afterglow of 8 ms or less having a filter containing a dye having an absorption peak in the wavelength region,
Differences Δx and Δy with respect to the initial chromaticity of the chromaticity of light, which is a combination of the emission of the red phosphor and the emission of the green phosphor when the sum of the luminances of green and red becomes 1/100 of the initial value after the light is turned off. Are plasma display panels in which −0.08 ≦ Δx ≦ 0.12 and −0.12 ≦ Δy ≦ 0.08, respectively. A red phosphor composed of a mixture of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu, a green phosphor composed of Zn ₂ SiO ₄ : Mn, a blue phosphor, and (Y, Gd ) In a plasma display panel having a 1/10 afterglow of 8 ms or less having filters with different transmittances for the emission of PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu.
A plasma display panel in which the luminance ratio X of (Y, Gd) PVO ₄ : Eu in the red phosphor and the Mn concentration Y of Zn ₂ SiO ₄ : Mn satisfies the relationship of 65Y-210 ≦ X ≦ 65Y-135. . A red phosphor composed of a mixture of (Y, Gd) PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu, a green phosphor composed of Zn ₂ SiO ₄ : Mn, a blue phosphor, and (Y, Gd ) In a plasma display panel having a 1/10 afterglow of 8 ms or less having filters with different transmittances for the emission of PVO ₄ : Eu and (Y, Gd) BO ₃ : Eu.
The luminance ratio X of (Y, Gd) PVO ₄ : Eu in the red phosphor and the x value Z of the chromaticity of Zn ₂ SiO ₄ : Mn satisfy the relationship of 10400Z−2547 ≦ X ≦ 10400Z−2472. Plasma display panel.   The plasma display panel according to any one of claims 1 to 3, wherein the red phosphor, the green phosphor, and the blue phosphor each have a luminance of 1/100 or less after one frame from turning off. The luminance ratio X of (Y, Gd) PVO ₄ : Eu in the red phosphor satisfies 35 ≦ X, and the Mn concentration Y of the Zn ₂ SiO ₄ : Mn is 3.0 ≦ Y ≦ 3. The plasma display panel according to claim 1, wherein the plasma display panel satisfies 5.   The plasma display panel according to claim 1, wherein the one frame is 16.7 ms. The plasma display panel according to claim 1, wherein the green phosphor is a mixture of two or more Zn ₂ SiO ₄ : Mn having different Mn concentrations.