JP2006299098A - Light emitting apparatus and image display unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a light emitting apparatus which attains short afterglow, prolongation of service life and high color-purity of a green phosphor, to improve moving image characteristics by using it, and to provide a high performance image display unit. <P>SOLUTION: An aluminate phosphor which can be expressed by the following general formula is used as the green phosphor for the light emitting apparatus and the image display unit. The general formula is (Mg<SB>a</SB>Zn<SB>1-a</SB>)<SB>(1-b)</SB>Al<SB>2</SB>O<SB>4</SB>:Mn<SB>b</SB>, wherein the range of a and b is 0≤a≤1 and 0<b<1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light-emitting device and an image display device that include, as a fluorescent film, a phosphor that emits green light when excited by ultraviolet rays, vacuum ultraviolet rays, or electron beams.

  Performance in various light emitting devices and image display devices represented by flat type rare gas discharge fluorescent lamps, plasma displays (abbreviated as PDP), three-wavelength type white fluorescent lamps, liquid crystal backlights and field emission displays (abbreviated as FED) Is largely dependent on the performance of the phosphor used.

For example, in a plasma display, silicate phosphor Zn ₂ SiO ₄ : Mn has generally been used as a green phosphor. However, this phosphor has a long afterglow time and contributes to deterioration of moving image characteristics. That is, since the afterglow time is long, the next image is displayed while the previously displayed image does not disappear, and the image quality is degraded. There is also a problem that the discharge voltage is higher than phosphors of other colors (red and blue). In addition, there is room for improvement in terms of lifetime, and improvements related to these characteristics have been made, but sufficient characteristics have not yet been achieved. In addition, nonpatent literatures 1-3 are mentioned as related technical literature, for example.

Monthly Display May 2001, P43-47 Material Integration p.17-24, VOL. 14, no. 9, 2001 Proceedings of The 10th International Display Workshops (PDP p1-13, p.953, 2003)

  Accordingly, an object of the present invention is to provide a light emitting device and an image display device including a green phosphor having a short afterglow time and a long lifetime.

  In order to achieve the above object, the inventors have conducted various studies on the green phosphor. As a result, by using an aluminate green phosphor having a composition represented by the following general formula, short afterglow, long life characteristics It was found that can be realized.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.
The concentration of Mn that is the activator concentration is preferably 0 <b ≦ 0.4.

The characteristics of typical configuration examples of the present invention are listed below.
(1) A light-emitting device including a light-transmitting substrate on which a fluorescent film is formed and an excitation source that emits light by irradiating the fluorescent film with excitation energy, wherein the fluorescent film is manganese represented by the following general formula: It contains an activated aluminate phosphor.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.
(2) In the above (1), the excitation source that causes the phosphor represented by the general formula to emit light includes ultraviolet rays or an electron beam having a wavelength of 250 nm or less.
(3) In a light emitting device comprising a three-wavelength white fluorescent lamp including a red light emitting phosphor, a green light emitting phosphor and a blue light emitting phosphor, the green light emitting phosphor is a manganese-activated aluminate represented by the following general formula: It contains a salt phosphor.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.
(4) In an image display apparatus comprising a display panel on which a fluorescent film is formed and means for irradiating the fluorescent film with excitation energy based on image information, the fluorescent film is manganese represented by the following general formula: It contains an activated aluminate phosphor.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.
(5) An image display device comprising a color image display panel on which a red light emitting fluorescent film, a green light emitting fluorescent film and a blue light emitting fluorescent film are formed, and means for irradiating each fluorescent film with excitation energy based on image information in the phosphor forming the green emitting phosphor layer has the general formula, characterized by containing a manganese-activated aluminate phosphor represented by the following general formula _{(Mg a Zn 1-a)} (1- _b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.
(6) In the above (5), the means for irradiating the excitation energy based on the image information includes plasma generation means including a gas discharge electrode and a discharge rare gas, and the plasma generation means includes the image information in the image information. And a means for irradiating the fluorescent film with excitation energy including ultraviolet light having a wavelength of 250 nm or less generated by causing plasma discharge or vacuum ultraviolet light.
(7) In the above (5), the means for irradiating excitation energy based on the image information includes a field emission electron source facing the color image display panel, and the field emission electron source is the image information. And a means for irradiating the fluorescent film with an electron beam generated based on the above as excitation energy.
(8) In an image display device comprising a three-wavelength white fluorescent lamp including a red-emitting phosphor, a green-emitting phosphor, and a blue-emitting phosphor, and a liquid crystal display panel using the fluorescent lamp as a backlight, the three-wavelength The green light-emitting phosphor of the white fluorescent lamp includes a manganese-activated aluminate phosphor represented by the following general formula.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.

  The green light-emitting phosphor of the present invention has not only short persistence but also high color purity characteristics, and it is possible to realize a high-performance light-emitting device and high-performance image display apparatus with excellent moving image characteristics. Furthermore, the PDP has a reduced discharge voltage and a long life characteristic, so that high performance of the PDP can be realized.

  FIG. 1 is an exploded perspective view showing a part of a typical plasma display panel (PDP) structure. The plasma display panel has a structure in which a front substrate and a rear substrate are bonded together, and a discharge gas is sealed between the substrates.

  The front substrate has a plurality of electrode pairs each composed of a transparent electrode 2 and a bus electrode 3 (usually one of the electrode pairs is called an X electrode) for sustain discharge (also called display discharge) on the front plate glass 1. The other is referred to as a Y electrode (only one pair is shown in FIG. 1), and these electrode pairs are covered with a dielectric 4 and a protective film 5.

  The back substrate has address electrodes 9 on a back glass substrate 6, and the address electrodes 9 are covered with a dielectric 8. Further, partition walls 7 are formed on the dielectric 8, and red, blue, and green phosphor films 10 are periodically formed between the partition walls 7 adjacent to each other.

  The front substrate and the back substrate are aligned so that the electrode 2 on the front substrate side and the electrode 9 on the back substrate side are approximately orthogonal to each other (in some cases, simply cross each other). And a discharge gas containing a rare gas such as Ne or Xe is sealed in the space between the substrates, and a plurality of discharge cells are formed in a matrix between the substrates. By selectively applying a voltage to the sustain electrode pair on the front substrate side and the address electrode on the rear substrate side, a discharge is generated in a desired cell among the plurality of cells. Vacuum ultraviolet rays are generated by the main discharge, and the generated vacuum ultraviolet rays excite the phosphors 10 to emit red, blue, and green light, thereby performing full color display.

An example of a method for synthesizing the green phosphor used in the present invention is shown below.
MgCO ₃ [a × (1-b) mol], ZnCO ₃ [(1-a) × (1-b) mol] where 0 ≦ a ≦ 1, 0 <b <1, Al ₂ O ₃ ( 1 mol) and MnCO ₃ (b mol) were weighed and mixed, and the obtained mixture was calcined in an alumina crucible at 1300 ° C. for 3 hours in a reducing atmosphere. After pulverizing the fired product with a ball mill, washing with water, classification, drying,
Formula _{(Mg a Zn 1-a)} (1-b) Al 2 O 4: Mn b [However, 0 ≦ a ≦ 1,0 <b <1 ] to obtain a phosphor represented by.

  A plasma display panel was prepared by a known method using the green phosphor according to the present invention, and the light emission characteristics (chromaticity, afterglow time), discharge voltage, and life characteristics were measured.

At this time, as the red phosphor, (Y, Gd) BO ₃ : Eu, Y ₂ O ₃ : Eu, (Y, Gd) (P, V) O ₄ : Eu and Y (P, V) O ₄ : A plasma display panel was manufactured using Eu and BaMgAl ₁₀ O ₁₇ : Eu, Sr ₃ MgSi ₂ O ₈ : Eu and (Ba, Sr) ₃ MgSi ₂ O ₈ : Eu as blue phosphors.

Luminance maintenance rate (A = A ₁ / A ₀ × 100) is used as an index representing the lifetime of panel driving by measuring the light emission intensity (A ₀ ) at the start of panel driving and the luminance (A ₁ ) at 500 hours after panel driving. Was used. At this time, as a comparative example, a PDP using Zn ₂ SiO ₄ : Mn as a green phosphor was also produced, and the characteristics were measured.

  Table 1 compares the characteristics of the green phosphors.

比較例Ｚｎ_２ＳｉＯ_４：Ｍｎに対し、本発明の緑色発光蛍光体（Ｍｇ_aＺｎ_１−ａ）_{（１−ｂ）}Ａｌ_２Ｏ_４：Ｍｎ_ｂ 〔ただし、０≦ａ≦１、０＜ｂ＜１〕は、色度ｘ値が小さく、色度ｙ値が大きい、すなわち、色純度が高いことが示された。

Comparative Example _Zn 2 _SiO 4: Mn with respect to the green-emitting phosphor of the present invention _{(Mg a Zn 1-a)} (1-b) Al 2 O 4: Mn b [However, 0 ≦ a ≦ 1,0 <b <1] indicates that the chromaticity x value is small and the chromaticity y value is large, that is, the color purity is high.

  In addition, the afterglow time is short, and excellent moving image characteristics can be displayed. Furthermore, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it has been shown that long life is exhibited.

FIG. 2 shows excitation spectra of MgAl ₂ O ₄ : Mn, (Zn _0.5 Mg _0.5 ) Al ₂ O ₄ : Mn, and ZnAl ₂ O ₄ : Mn. In either case, it was found that light was efficiently emitted when excited by ultraviolet light having a wavelength of 250 nm or less or vacuum ultraviolet light.

Comparative example

A phosphor layer is formed using Zn ₂ SiO ₄ : Mn as a green phosphor, (Y, Gd) BO ₃ : Eu as a red phosphor, and BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor, as shown in FIG. A PDP was prepared.

  At this time, red, blue, and green phosphor films 10 were formed between the barrier ribs 7 in the following procedure. In other words, 40 parts by weight of the phosphor and 60 parts by weight of the vehicle are mixed to form a phosphor paste, which is applied by screen printing, and then the volatile components in the paste are removed and the organic matter is removed by burning by a drying and firing process. Formed. A plasma display panel in which a discharge gas was sealed by bonding the back substrate on which the phosphor layer was formed to the front substrate was fabricated and evaluated.

  The evaluation items used were the chromaticity, afterglow time, discharge voltage, luminance maintenance ratio, and color reproduction range of the three-color phosphors (vs. NTSC (National Television Standards Committee) ratio). Show.

Zn ₂ SiO ₄ : Mn, which is a green phosphor, has a long afterglow time compared to other colors (red and blue), and has a large influence on image quality characteristics. In addition, since the discharge voltage is higher than other colors, the burden on the drive circuit is high.

以下に本発明の実施例を示すが、本発明はこれらの実施例によって制限されるものではない。

Examples of the present invention are shown below, but the present invention is not limited by these Examples.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<Example 1-3>
(Y, Gd) BO ₃ : Eu is used as a red phosphor, BaMgAl ₁₀ O ₁₇ : Eu is used as a blue phosphor, and MgAl ₂ O ₄ : Mn or (Zn _0.5 Mg _0.5 ) Al ₂ O ₄ is used as a green phosphor. A phosphor layer using Mn or ZnAl ₂ O ₄ : Mn was formed, and the PDP shown in FIG. 1 was produced and evaluated.

As shown in Table 1, with respect to Zn ₂ SiO ₄ : Mn used in the comparative example, the green phosphor represented by the following general formula in the present invention has a high color purity, a short afterglow time, and an excellent moving image. Characteristic display is now possible.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
[However, 0 ≦ a ≦ 1, 0 <b <1]
In addition, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it is shown that long life is exhibited.

Further, as shown in Table 3, it was shown that the color reproduction range in this example was higher than that in the comparative example. For characteristic values for the green phosphor of the present embodiment, comparative examples shown in Tables 1 and 2 above (green phosphor) Zn 2 _SiO 4: beg compared with characteristic values of _Mn.

＜実施例４−６＞
赤色蛍光体としてＹ_２Ｏ_３：Ｅｕ、青色蛍光体としてＢａＭｇＡｌ_１０Ｏ_１７：Ｅｕを用い、緑色蛍光体として、ＭｇＡｌ_２Ｏ_４：Ｍｎ、または（Ｚｎ_0.5Ｍｇ_0.5）Ａｌ_２Ｏ_４：Ｍｎ、またはＺｎＡｌ_２Ｏ_４：Ｍｎを用いた蛍光体層を形成し、図１に示したＰＤＰを作製し評価を行った。

<Example 4-6>
Y ₂ O ₃ : Eu is used as a red phosphor, BaMgAl ₁₀ O ₁₇ : Eu is used as a blue phosphor, and MgAl ₂ O ₄ : Mn or (Zn _0.5 Mg _0.5 ) Al ₂ O ₄ : Mn is used as a green phosphor. Alternatively, a phosphor layer using ZnAl ₂ O ₄ : Mn was formed, and the PDP shown in FIG. 1 was produced and evaluated.

As shown in Table 1, with respect to Zn ₂ SiO ₄ : Mn used in the comparative example, the green phosphor represented by the following general formula in the present invention has a high color purity, a short afterglow time, and an excellent moving image. Characteristic display is now possible.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
[However, 0 ≦ a ≦ 1, 0 <b <1]
In addition, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it is shown that long life is exhibited.

In addition, as shown in Table 4, the color reproduction range in this example was higher than that in the comparative example. For characteristic values for the green phosphor of the present embodiment, comparative examples shown in Tables 1 and 2 above (green phosphor) Zn 2 _SiO 4: beg compared with characteristic values of _Mn.

＜実施例７−９＞
赤色蛍光体としてＹ（Ｐ，Ｖ）Ｏ_４：Ｅｕ、青色蛍光体としてＢａＭｇＡｌ_１０Ｏ_１７：Ｅｕを用い、緑色蛍光体として、ＭｇＡｌ_２Ｏ_４：Ｍｎ、または（Ｚｎ_0.5Ｍｇ_0.5）Ａｌ_２Ｏ_４：Ｍｎ、またはＺｎＡｌ_２Ｏ_４：Ｍｎを用いた蛍光体層を形成し、図１に示したＰＤＰを作製し評価を行った。

<Example 7-9>
Y (P, V) O ₄ : Eu is used as a red phosphor, BaMgAl ₁₀ O ₁₇ : Eu is used as a blue phosphor, and MgAl ₂ O ₄ : Mn or (Zn _0.5 Mg _0.5 ) Al ₂ O is used as a green phosphor. _4: Mn or ZnAl ₂ O _4,: forming a phosphor layer using Mn, was evaluated to produce the PDP shown in FIG.

As shown in Table 1, with respect to Zn ₂ SiO ₄ : Mn used in the comparative example, the green phosphor represented by the following general formula in the present invention has a high color purity, a short afterglow time, and an excellent moving image. Characteristic display is now possible.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
[However, 0 ≦ a ≦ 1, 0 <b <1]
In addition, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it is shown that long life is exhibited.

Further, as shown in Table 5, it was shown that the color reproduction range in this example was higher than that in the comparative example. For characteristic values for the green phosphor of the present embodiment, comparative examples shown in Tables 1 and 2 above (green phosphor) Zn 2 _SiO 4: beg compared with characteristic values of _Mn.

＜実施例１０−１２＞
赤色蛍光体として（Ｙ，Ｇｄ）（Ｐ，Ｖ）Ｏ_４：Ｅｕ、青色蛍光体としてＢａＭｇＡｌ_１０Ｏ_１７：Ｅｕを用い、緑色蛍光体として、ＭｇＡｌ_２Ｏ_４：Ｍｎ、または（Ｚｎ_0.5Ｍｇ_0.5）Ａｌ_２Ｏ_４：Ｍｎ、またはＺｎＡｌ_２Ｏ_４：Ｍｎを用いた蛍光体層を形成し、図１に示したＰＤＰを作製し評価を行った。

<Example 10-12>
(Y, Gd) (P, V) O ₄ : Eu is used as the red phosphor, BaMgAl ₁₀ O ₁₇ : Eu is used as the blue phosphor, and MgAl ₂ O ₄ : Mn or (Zn _0.5 Mg _0.5 is used as the green phosphor. ) A phosphor layer using Al ₂ O ₄ : Mn or ZnAl ₂ O ₄ : Mn was formed, and the PDP shown in FIG. 1 was prepared and evaluated.

As shown in Table 1, with respect to Zn ₂ SiO ₄ : Mn used in the comparative example, the green phosphor represented by the following general formula in the present invention has a high color purity, a short afterglow time, and an excellent moving image. Characteristic display is now possible.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
[However, 0 ≦ a ≦ 1, 0 <b <1]
In addition, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it is shown that long life is exhibited.

Further, as shown in Table 6, it was shown that the color reproduction range in this example was higher than that in the comparative example. For characteristic values for the green phosphor of the present embodiment, comparative examples shown in Tables 1 and 2 above (green phosphor) Zn 2 _SiO 4: beg compared with characteristic values of _Mn.

＜実施例１３−１５＞
赤色蛍光体としてＹ（Ｐ，Ｖ）Ｏ_４：Ｅｕ、青色蛍光体として（Ｂａ，Ｓｒ）_３ＭｇＳｉ_２Ｏ_８：Ｅｕを用い、緑色蛍光体として、ＭｇＡｌ_２Ｏ_４：Ｍｎ、または（Ｚｎ_0.5Ｍｇ_0.5）Ａｌ_２Ｏ_４：Ｍｎ、またはＺｎＡｌ_２Ｏ_４：Ｍｎを用いた蛍光体層を形成し、図１に示したＰＤＰを作製し評価を行った。

<Example 13-15>
Y (P, V) O ₄ : Eu is used as a red phosphor, (Ba, Sr) ₃ MgSi ₂ O ₈ : Eu is used as a blue phosphor, and MgAl ₂ O ₄ : Mn or (Zn _0.5 is used as a green phosphor. A phosphor layer using Mg _0.5 ) Al ₂ O ₄ : Mn or ZnAl ₂ O ₄ : Mn was formed, and the PDP shown in FIG. 1 was prepared and evaluated.

  As shown in Table 1, with respect to Zn2SiO4: Mn used in the comparative example, the green phosphor represented by the following general formula in the present invention has a high color purity, a short afterglow time, and an excellent moving image characteristic display. It has become possible.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
[However, 0 ≦ a ≦ 1, 0 <b <1]
In addition, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it is shown that long life is exhibited.

Further, as shown in Table 7, it was shown that the color reproduction range in this example was higher than that in the comparative example. For characteristic values for the green phosphor of the present embodiment, comparative examples shown in Tables 1 and 2 above (green phosphor) Zn 2 _SiO 4: beg compared with characteristic values of _Mn.

＜実施例１６−１８＞
赤色蛍光体として（Ｙ，Ｇｄ）（Ｐ，Ｖ）Ｏ_４：Ｅｕ、青色蛍光体として（Ｂａ，Ｓｒ）_３ＭｇＳｉ_２Ｏ_８：Ｅｕを用い、緑色蛍光体として、ＭｇＡｌ_２Ｏ_４：Ｍｎ、または（Ｚｎ_0.5Ｍｇ_0.5）Ａｌ_２Ｏ_４：Ｍｎ、またはＺｎＡｌ_２Ｏ_４：Ｍｎを用いた蛍光体層を形成し、図１に示したＰＤＰを作製し評価を行った。

<Example 16-18>
(Y, Gd) (P, V) O ₄ : Eu as a red phosphor, (Ba, Sr) ₃ MgSi ₂ O ₈ : Eu as a blue phosphor, MgAl ₂ O ₄ : Mn as a green phosphor, Alternatively, a phosphor layer using (Zn _0.5 Mg _0.5 ) Al ₂ O ₄ : Mn or ZnAl ₂ O ₄ : Mn was formed, and the PDP shown in FIG. 1 was produced and evaluated.

  As shown in Table 1, with respect to Zn2SiO4: Mn used in the comparative example, the green phosphor represented by the following general formula in the present invention has a high color purity, a short afterglow time, and an excellent moving image characteristic display. It has become possible.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
[However, 0 ≦ a ≦ 1, 0 <b <1]
In addition, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it is shown that long life is exhibited.
Further, as shown in Table 8, it was shown that the color reproduction range in this example was higher than that in the comparative example. For characteristic values for the green phosphor of the present embodiment, comparative examples shown in Tables 1 and 2 above (green phosphor) Zn 2 _SiO 4: beg compared with characteristic values of _Mn.

＜実施例１９−２１＞
赤色蛍光体としてＹ（Ｐ，Ｖ）Ｏ_４：Ｅｕ、青色蛍光体としてＳｒ_３ＭｇＳｉ_２Ｏ_８：Ｅｕを用い、緑色蛍光体として、ＭｇＡｌ_２Ｏ_４：Ｍｎ、または（Ｚｎ_0.5Ｍｇ_0.5）Ａｌ_２Ｏ_４：Ｍｎ、またはＺｎＡｌ_２Ｏ_４：Ｍｎを用いた蛍光体層を形成し、図１に示したＰＤＰを作製し評価を行った。

<Example 19-21>
Y (P, V) O ₄ : Eu is used as a red phosphor, Sr ₃ MgSi ₂ O ₈ : Eu is used as a blue phosphor, and MgAl ₂ O ₄ : Mn or (Zn _0.5 Mg _0.5 ) Al is used as a green phosphor. A phosphor layer using ₂ O ₄ : Mn or ZnAl ₂ O ₄ : Mn was formed, and the PDP shown in FIG. 1 was prepared and evaluated.

As shown in Table 1, with respect to Zn ₂ SiO ₄ : Mn used in the comparative example, the green phosphor represented by the following general formula in the present invention has a high color purity, a short afterglow time, and an excellent moving image. Characteristic display is now possible.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
[However, 0 ≦ a ≦ 1, 0 <b <1]
In addition, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it is shown that long life is exhibited.

Further, as shown in Table 9, it was shown that the color reproduction range in this example was higher than that in the comparative example. For characteristic values for the green phosphor of the present embodiment, comparative examples shown in Tables 1 and 2 above (green phosphor) Zn 2 _SiO 4: beg compared with characteristic values of _Mn.

＜実施例２２−２４＞
赤色蛍光体として（Ｙ、Gd）（Ｐ，Ｖ）Ｏ_４：Ｅｕ、青色蛍光体としてＳｒ_３ＭｇＳｉ_２Ｏ_８：Ｅｕを用い、緑色蛍光体として、ＭｇＡｌ_２Ｏ_４：Ｍｎ、または（Ｚｎ，Ｍｇ）Ａｌ_２Ｏ_４：Ｍｎ、またはＺｎＡｌ_２Ｏ_４：Ｍｎを用いた蛍光体層を形成し、図１に示したＰＤＰを作製し評価を行った。

<Examples 22-24>
(Y, Gd) (P, V) O ₄ : Eu is used as a red phosphor, Sr ₃ MgSi ₂ O ₈ : Eu is used as a blue phosphor, MgAl ₂ O ₄ : Mn, or (Zn, A phosphor layer using Mg) Al ₂ O ₄ : Mn or ZnAl ₂ O ₄ : Mn was formed, and the PDP shown in FIG. 1 was prepared and evaluated.

As shown in Table 1, with respect to Zn ₂ SiO ₄ : Mn used in the comparative example, the green phosphor represented by the following general formula in the present invention has a high color purity, a short afterglow time, and an excellent moving image. Characteristic display is now possible.

General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
[However, 0 ≦ a ≦ 1, 0 <b <1]
In addition, since the discharge voltage is low, not only the driving method becomes easy, but also the luminance maintenance rate by driving is large, and it is shown that long life is exhibited.

Further, as shown in Table 10, it was shown that the color reproduction range in this example was higher than that in the comparative example. For characteristic values for the green phosphor of the present embodiment, comparative examples shown in Tables 1 and 2 above (green phosphor) Zn 2 _SiO 4: beg compared with characteristic values of _Mn.

＜実施例２５＞
この実施例は、平面型希ガス放電蛍光ランプに関するものである。はじめに比較例として、赤色蛍光体としてＹ₂Ｏ₃:Ｅｕ、緑蛍光体としてLaPO₄:Tb,Ce、青色蛍光体としてＢａＭｇＡｌ_１０Ｏ_１７：Ｅｕを用い、放電ガスとしてＸｅを含む希ガスを封入し、周知の方法により図3に示す平面型希ガス放電ランプを作製した。なお、同図において、符号の１１は蛍光体、１２は電極、１３は放電ガス、１４は密閉容器で１４Ａは背面ガラス、１４Ｂは前面ガラス、１５は誘電体である。

<Example 25>
This embodiment relates to a flat type rare gas discharge fluorescent lamp. As a comparative example, Y ₂ O ₃ : Eu is used as a red phosphor, LaPO ₄ : Tb, Ce is used as a green phosphor, BaMgAl ₁₀ O ₁₇ : Eu is used as a blue phosphor, and a rare gas containing Xe is enclosed as a discharge gas. Then, a flat type rare gas discharge lamp shown in FIG. 3 was produced by a known method. In the figure, reference numeral 11 is a phosphor, 12 is an electrode, 13 is a discharge gas, 14 is a sealed container, 14A is a rear glass, 14B is a front glass, and 15 is a dielectric.

Next, Y ₂ O ₃ : Eu as a red phosphor, BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor, MgAl ₂ O ₄ : Mn as a green phosphor, or (Zn _0.5 Mg _0.5 ) Al ₂ O ₄ : Mn, Alternatively, a planar rare gas discharge lamp of the present invention using ZnAl ₂ O ₄ : Mn was produced.

The results are shown in Table 11. The green phosphor used in the present invention has a composition formula of (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b [where 0 ≦ a ≦ 1, 0 <b <1] Thus, a flat type rare gas discharge lamp having high color purity and high color rendering properties was realized with respect to LaPO ₄ : Tb, Ce, which is the green phosphor used in the comparative example.

＜実施例２６−２８＞
この実施例は、画像表示装置（FED）に関するものである。はじめに比較例として、赤色蛍光体としてＹ₂Ｏ₂Ｓ:Ｅｕ、緑蛍光体としてＹ_２ＳｉＯ_５：Ｔｂ、青色蛍光体としてＺｎＳ：Ａｇ，Ｃｌを用い、周知の方法により、図４に示した電界放出表示装置（フィールド・エミッション・ディスプレイ：ＦＥＤ）を作製した。なお、同図において、符号１６は基板、１７は電子源、１８は陰極、１９は抵抗膜、２０は絶縁膜、２１はゲート、２２は円錐型金属、２３は面板、２４は蛍光体、２５は黒色導電材である。

<Examples 26-28>
This embodiment relates to an image display device (FED). As a comparative example, Y ₂ O ₂ S: Eu is used as a red phosphor, Y ₂ SiO ₅ : Tb is used as a green phosphor, and ZnS: Ag, Cl is used as a blue phosphor. A field emission display (Field Emission Display: FED) was produced. In the figure, reference numeral 16 is a substrate, 17 is an electron source, 18 is a cathode, 19 is a resistance film, 20 is an insulating film, 21 is a gate, 22 is a conical metal, 23 is a face plate, 24 is a phosphor, 25 Is a black conductive material.

Next, Y ₂ O ₂ S: Eu as a red phosphor, ZnS: Ag, Cl as a blue phosphor, MgAl ₂ O ₄ : Mn as a green phosphor, or (Zn _0.5 Mg _0.5 ) Al ₂ O ₄ : Mn, Alternatively, an FED of the present invention using ZnAl ₂ O ₄ : Mn was manufactured.

The results are shown in Table 12. As the green phosphor, the phosphor of the present invention that can be represented by the composition formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b [0 ≦ a ≦ 1, 0 <b <1] is used. In this case, a display device having a wider color reproduction range than that of the comparative example could be realized.

＜実施例２９＞
この実施例は、液晶表示装置に関するものである。はじめに比較例として、赤色蛍光体としてＹ₂Ｏ₃:Ｅｕ、緑蛍光体としてLaPO₄:Tb,Ce、青色蛍光体としてＢａＭｇＡｌ_１０Ｏ_１７：Ｅｕを用い、アルゴン−ネオン−水銀の混合ガスを放電ガスとして封入し、周知の方法により図５に示す冷陰極放電管（Ｃｏｌｄ Ｃａｔｈｏｄｅ Ｆｌｕｏｒｅｓｃｅｎｔ Ｌａｍｐ：ＣＣＦＬ）を作製した。そして、この冷陰極放電管を用い、周知の方法により図６に示した液晶表示装置を作製した。

<Example 29>
This embodiment relates to a liquid crystal display device. First, as a comparative example, Y ₂ O ₃ : Eu as a red phosphor, LaPO ₄ : Tb, Ce as a green phosphor, and BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor, and a mixed gas of argon-neon-mercury is discharged. A cold cathode discharge tube (Cold Cathode Fluorescent Lamp: CCFL) shown in FIG. 5 was produced by enclosing as gas. Then, using this cold cathode discharge tube, the liquid crystal display device shown in FIG. 6 was produced by a known method.

  In FIG. 5, reference numeral 26 denotes a glass tube, 27 denotes a phosphor, 28 denotes an electrode, and 29 denotes a discharge gas. In FIG. 6, 30 is a backlight unit, 31 is a liquid crystal element, 32 is a casing (lower), 33 is a reflector, 34 is a white light source (CCFL), 35 is a diffuser, 36 is a prism sheet, and 37 is A polarizing reflector, 38 is an inverter, and 39 is a housing (upper).

Next, Y ₂ O ₃ : Eu as a red phosphor, BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor, MgAl ₂ O ₄ : Mn as a green phosphor, or (Zn _0.5 Mg _0.5 ) Al ₂ O ₄ : Mn, Alternatively, a CCFL using ZnAl ₂ O ₄ : Mn was manufactured, and a liquid crystal display device using the CCFL was manufactured.

The results are shown in Table 13. The green phosphor used in the present invention can be expressed by _a composition formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b [0 ≦ a ≦ 1, 0 <b <1]. In addition, CCFL having high color purity and high color rendering properties was realized with respect to LaPO ₄ : Tb, Ce, which is the green phosphor used in the comparative example. In addition, the color reproducibility of the liquid crystal display device using this CCFL has also been improved.

The structure of a plasma display panel is shown. An excitation spectrum is shown. The structure of a flat type rare gas discharge fluorescent lamp is shown. 1 shows the structure of a field emission image display device. The structure of a cold cathode discharge tube (fluorescent lamp) is shown. 1 shows a structure of a liquid crystal display device.

Explanation of symbols

1 ... Front plate glass,
2 ... Transparent electrode,
3 ... Bus electrode,
4 ... Dielectric,
5 ... Protective film,
6 ... back plate glass,
7 ... partition wall,
8 ... Dielectric,
9: Address electrode,
10: Fluorescent film,
11 ... phosphor,
12 ... electrodes,
13 ... discharge gas,
14 ... Sealed container (back glass 14A, front glass 14B),
15 ... dielectric,
16 ... substrate,
17 ... electron source,
18 ... cathode,
19 ... resistive film,
20: Insulating film,
21 ... Gate,
22 ... conical metal,
23 ... face plate,
24 ... phosphor,
25 ... Black conductive material,
26 ... Glass tube,
27 ... phosphor,
28 ... electrodes,
29 ... discharge gas,
30 ... Backlight unit,
31 ... Liquid crystal element,
32 ... Case (bottom),
33 ... reflector,
34 ... White light source (CCFL),
35 ... diffusion plate,
36 ... Prism sheet,
37 ... Polarizing reflector,
38 ... an inverter,
39: Housing (upper).

Claims (8)

A light-emitting device comprising a light-transmitting substrate on which a fluorescent film is formed and an excitation source that emits light by irradiating the fluorescent film with excitation energy, wherein the fluorescent film is a manganese-activated alumina represented by the following general formula: A light-emitting device comprising an acid salt phosphor.
General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.   The light-emitting device according to claim 1, wherein the excitation source that emits the phosphor represented by the general formula includes ultraviolet light or an electron beam having a wavelength of 250 nm or less. In a light emitting device comprising a three-wavelength white fluorescent lamp including a red light emitting phosphor, a green light emitting phosphor and a blue light emitting phosphor, the green light emitting phosphor is a manganese-activated aluminate phosphor represented by the following general formula: A light emitting device comprising:
General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1. In an image display device comprising a display panel on which a fluorescent film is formed and means for irradiating the fluorescent film with excitation energy based on image information, the fluorescent film is a manganese-activated aluminium represented by the following general formula: An image display device comprising an acid salt phosphor.
General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1. An image display device comprising: a color image display panel on which a red light emitting fluorescent film, a green light emitting fluorescent film, and a blue light emitting fluorescent film are formed; and means for irradiating each fluorescent film with excitation energy based on image information. The phosphor forming the green light-emitting phosphor film contains a manganese-activated aluminate phosphor represented by the following general formula.
General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.   The means for irradiating excitation energy based on the image information includes plasma generation means including a gas discharge electrode and a discharge rare gas, and the plasma generation means causes plasma discharge based on the image information. 6. The image display device according to claim 5, further comprising means for irradiating the fluorescent film with excitation energy including generated ultraviolet light having a wavelength of 250 nm or less or vacuum ultraviolet light.   The means for irradiating excitation energy based on the image information includes a field emission electron source facing the color image display panel, and an electron beam generated by the field emission electron source based on the image information. 6. The image display device according to claim 5, further comprising means for irradiating the fluorescent film as excitation energy. An image display device comprising: a three-wavelength white fluorescent lamp including a red-emitting phosphor, a green-emitting phosphor, and a blue-emitting phosphor; and a liquid crystal display panel using the fluorescent lamp as a backlight. The green light-emitting phosphor of the lamp contains a manganese-activated aluminate phosphor represented by the following general formula.
General formula (Mg _a Zn _1-a ) _(1-b) Al ₂ O ₄ : Mn _b
However, the composition ranges of a and b in the formula are 0 ≦ a ≦ 1 and 0 <b <1.

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