KR100965544B1 - Phosphor for flat panel display device - Google Patents

Abstract

The present invention relates to a phosphor for a flat panel display device, the phosphor comprising: a first phosphor having a high luminance of 60 to 200% relative to a ZnS: Cu, Al phosphor; And in the CIE color coordinates x is 0.520 to 0.730, y is 0.200 to 0.380 red phosphor, x is 0.080 to 0.220, y is 0.010 to 0.150 blue phosphor, and x is 0.050 to 0.310, y is 0.560 to And a second phosphor having excellent color reproduction characteristics selected from the group consisting of green phosphors of 0.830.

The phosphor of the present invention can provide a fluorescent film for a flat panel display device having excellent luminance and color reproduction characteristics by mixing a phosphor having excellent luminance and a phosphor having excellent color reproduction characteristics.

Flat panel display, phosphor, high brightness, color reproduction

Description

Phosphor for flat panel display device {PHOSPHOR FOR FLAT PANEL DISPLAY DEVICE}

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to phosphors for flat panel display apparatuses and to phosphors for flat panel display apparatuses capable of appropriately adjusting luminance and color coordinate characteristics.

[Prior art]

In general, a flat panel display device is configured to implement an arbitrary image by arranging a cathode part capable of emitting electrons and an anode part emitting light by the electrons, respectively, on two substrates.

According to the basic structure of the flat panel display device, a field emission display (FED), which is one of the flat panel display devices, is also used as a cold cathode electron source as an electron emission source on a cathode substrate, which is one of two substrates. It arrange | positions, and it is comprised by arrange | positioning the fluorescent layer which is excited by the impact of an electron beam, and implements an arbitrary color on the anode substrate which is another substrate.

The phosphor layer is formed of red, green, and blue phosphors, and sulfide-based phosphors based on (ZnCd) S, Y ₂ O ₃ : Eu phosphors, SrTiO ₃ : Pr, Al, and the like are mainly used as the red phosphors. As the green phosphor, ZnS: Cu, Al, ZnGa ₂ O ₄ : Mn, etc. are mainly used. In addition, ZnS: Ag, Cl or the like is mainly used as the blue phosphor.

Recently, researches that can adjust the characteristics according to the purpose while improving the brightness and color reproduction characteristics of the flat panel display device using such a phosphor.

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 phosphor for a flat panel display device which exhibits high luminance and excellent color reproduction characteristics and can be adjusted according to the purpose.

In order to achieve the above object, the present invention is a first phosphor having a high luminance of 60 to 200% relative luminance to the ZnS: Cu, Al phosphor; And in the CIE color coordinates x is 0.520 to 0.730, y is 0.200 to 0.380 red phosphor, x is 0.080 to 0.220, y is 0.010 to 0.150 blue phosphor, and x is 0.050 to 0.310, y is 0.560 to Provided is a phosphor for a flat panel display device including a second phosphor having excellent color reproduction characteristics selected from the group consisting of green phosphors of 0.830.

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

The present invention relates to a phosphor constituting a fluorescent film in a flat panel display device. The fluorescent film requires high luminance and excellent color reproduction characteristics, but it is almost impossible for one phosphor to satisfy all of these conditions. In the present invention, a high luminance is obtained by mixing a phosphor having excellent luminance characteristics and a phosphor having excellent color reproduction characteristics at an appropriate ratio. And all excellent color reproduction characteristics could be satisfied.

The phosphor of the present invention is a red phosphor having x of 0.520 to 0.730, y of 0.200 to 0.380, and x of 0.080 in a CIE color coordinate and a first phosphor having a high luminance of 60 to 200% relative to a ZnS: Cu, Al phosphor. To 0.220, wherein y is a blue phosphor having 0.010 to 0.150, and a second phosphor having excellent color reproduction characteristics selected from the group consisting of a green phosphor having x of 0.050 to 0.310 and y of 0.560 to 0.830.

The mixing ratio of the first phosphor and the second phosphor is preferably 70:30 to 97: 3 by weight. When the ratio of the first phosphor is less than 70% by weight, the luminance is lowered, which is not preferable. When the ratio of the first phosphor is more than 97% by weight, the amount of the second phosphor is relatively decreased, and thus color reproduction characteristics are not preferable.

As described above, the effect of the present invention by mixing the first phosphor having high brightness and the second phosphor having excellent color reproduction characteristics is independent of the color of the phosphor, and can be applied to both red, green, and blue phosphors. . However, since the first phosphor is used as the first phosphor and the second phosphor is excellent in color reproduction characteristics among the phosphors having the same color, the first phosphor is also the red phosphor and the second phosphor. In the case where the green phosphor is used as the phosphor, the first phosphor should be the green phosphor, and when the second phosphor is the blue phosphor, the first phosphor should also be the blue phosphor.

In more detail, when applied to a red phosphor, Y ₂ O ₂ S: Eu, Y ₂ O ₃ : Eu, or YVO ₄ : Eu may be used as the first phosphor, and Y ₂ O as the second phosphor. ₂ S: Eu, YVO ₄ : Eu, Y (V, P) O ₄ : Eu, (Y, Gd) BO ₂ : Eu or SrTiO ₃ : Pr can be used. When applied to the green phosphor, ZnS: Cu, SrGa ₂ S ₄ : Eu, CaS: Ce, La ₂ O ₂ S: Tb, Y ₂ O ₂ S: Tb, Y ₂ SiO ₅ : Tb or Gd ₂ O ₂ S: can be used to Tb, the second phosphor include _{Zn (Ga, Al) 2 O} 4: Mn, (Ba, Sr, Mg) O-nAl 2 O 3: Mn, ZnGa 2 O 4: Mn, Zn ₂ SiO ₄ : Mn, SrGa ₂ S ₄ : Eu or ZnS: Cu may be used. Also, when applied to the blue phosphor, SrGa ₂ S ₄ : Ce, ZnS: Ag, or Y ₂ SiO ₅ : Ce may be used as the first phosphor, and Sr ₅ (PO ₄ ) ₃ Cl: Eu, as the second phosphor. ZnS: Ag, BaMgAl ₁₀ O ₁₇ : Eu or Y ₂ SiO ₅ : Ce can be used.

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

(Examples 1-3 and Comparative Examples 1-2)

A first green phosphor having a high ZnS: Cu, Al brightness and a second green phosphor having excellent ZnGa ₂ O ₄ : Mn color reproduction characteristics having a x value of 0.118 and a y value of 0.745 in a CIE color coordinate are shown in Table 1 below. By mixing, a green phosphor for a flat panel display device was prepared.

The x and y values of the relative luminance and the CIE color coordinates of the prepared green phosphors were measured and the results are shown in Table 1 below.

Mix ratio (% by weight) Relative luminance (%) CIE x CIE y ZnS: Cu, Al ZnGa ₂ O ₄ : Mn Comparative Example 1 100 0 100 0.301 0.598 Example 1 95 5 97 0.292 0.605 Example 2 90 10 94 0.283 0.613 Example 3 85 15 91 0.274 0.620 Comparative Example 2 80 20 88 0.264 0.627

As shown in Table 1, the phosphors of Examples 1 to 3, in which the first phosphor having high brightness and the second phosphor having excellent color reproduction characteristics were mixed in a range of 85:15 to 95: 5, using only the first phosphor. It can be seen that the color coordinate value can be improved from (0.301, 0.598) to (0.274, 0.620) to dark green as compared with Example 1, and the luminance is superior to that of Comparative Example 2 in which the second phosphor is used in excess.

As described above, the phosphor of the present invention can provide a fluorescent film for a flat panel display device having excellent luminance and color reproduction characteristics by using a mixture of a phosphor having excellent luminance and a phosphor having excellent color reproduction characteristics.

Claims (5)

A first phosphor having a high luminance of 60 to 200% relative to a ZnS: Cu, Al phosphor; And In the CIE color coordinates x is 0.520 to 0.730, y is 0.200 to 0.380 red phosphor, x is 0.080 to 0.220, y is 0.010 to 0.150 blue phosphor, and x is 0.050 to 0.310, y is 0.560 to 0.830 A second phosphor having excellent color reproduction characteristics selected from the group consisting of phosphorus green phosphors, The mixing ratio of the first phosphor and the second phosphor is 85:15 to 95: 5 by weight, The first phosphor is selected from the group consisting of Y ₂ O ₂ S: Eu, Y ₂ O ₃ : Eu and YVO ₄ : Eu, and the second phosphor is Y (V, P) O ₄ : Eu, (Y, Gd) BO ₂ : Eu and SrTiO ₃ : Pr, or The first phosphor is selected from the group consisting of SrGa ₂ S ₄ : Ce, ZnS: Ag and Y ₂ SiO ₅ : Ce, and the second phosphor is Sr ₅ (PO ₄ ) ₃ Cl: Eu, ZnS: Ag and BaMgAl ₁₀ O ₁₇ : is selected from the group consisting of Eu, The first phosphor is ZnS: Cu, ZnS: Cu, Al, SrGa ₂ S ₄ : Eu, CaS: Ce, La ₂ O ₂ S: Tb, Y ₂ O ₂ S: Tb, Y ₂ SiO ₅ : Tb and Gd ₂ O ₂ S: is selected from the group consisting of Tb, the second phosphor is _{Zn (Ga, Al) 2 O} 4: Mn, (Ba, Sr, Mg) O-nAl 2 O 3: Mn, ZnGa 2 O 4 Phosphor for flat panel display apparatuses selected from the group consisting of: Mn, Zn ₂ SiO ₄ : M and SrGa ₂ S ₄ : Eu. delete delete delete delete