Plasma display unit, phosphor and process for producing phosphor
First Claim
Patent Images
1. A plasma display device comprising:
- a plasma display panel including discharge cells corresponding to colors, respectively, and phosphor layers of the colors, respectively, said phosphor layers being excitable by ultraviolet rays to emit light,wherein said phosphor layers include a blue phosphor layer formed of a compound expressed by one of Ba1−
xMgAl10O17;
Eux and Ba1−
x−
ySryMgAl10O17;
Eux, with said compound including at least one of(i) a pentavalent ion of Nb,(ii) a pentavalent ion of Ta,(iii) a pentavalent ion of P,(iv) a pentavalent ion of As,(v) a pentavalent ion of Sb,(vi) a pentavalent ion of Bi,(vii) an ion of Pr, and(viii) an ion of Tmsubstituting for a part of one of Al and Mg, and with 0.03≦
x≦
0.2 and 0.1≦
y≦
0.5.
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Abstract
A plasma display device exhibits suppressed luminance degradation of a phosphor, a suppressed change in chromaticity and improved discharge characteristics as a result of suppression of adsorption of water or hydrocarbon-containing gas on a surface of a blue phosphor. A blue phosphor layer used in the plasma display device is formed of a compound expressed by Ba1−XMgAl10O17:EuX or Ba1−x−ySryMgAl10O17:EuX and includes at least one element that is selected from Nb, Ta, Pr, P, As, Sb, Bi and Tm which substitutes for a part of its Al or Mg element.
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Citations
18 Claims
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1. A plasma display device comprising:
-
a plasma display panel including discharge cells corresponding to colors, respectively, and phosphor layers of the colors, respectively, said phosphor layers being excitable by ultraviolet rays to emit light, wherein said phosphor layers include a blue phosphor layer formed of a compound expressed by one of Ba1−
xMgAl10O17;
Eux and Ba1−
x−
ySryMgAl10O17;
Eux, with said compound including at least one of(i) a pentavalent ion of Nb, (ii) a pentavalent ion of Ta, (iii) a pentavalent ion of P, (iv) a pentavalent ion of As, (v) a pentavalent ion of Sb, (vi) a pentavalent ion of Bi, (vii) an ion of Pr, and (viii) an ion of Tm substituting for a part of one of Al and Mg, and with 0.03≦
x≦
0.2 and 0.1≦
y≦
0.5.- View Dependent Claims (2, 3, 4)
is substituting for a part of said one of Al and Mg. -
3. The plasma display device according to claim 2, wherein
said at least one of (i) said pentavalent ion of Nb, (ii) said pentavalent ion of Ta, (iii) said pentavalent ion of P, (iv) said pentavalent ion of As, (v) said pentavalent ion of Sb, and (vi) said pentavalent ion of Bi is substituting for 0.01% to 3.00% of said one of Al and Mg. -
4. The plasma display device according to claim 1, wherein
said at least one of (i) said pentavalent ion of Nb, (ii) said pentavalent ion of Ta, (iii) said pentavalent ion of P, (iv) said pentavalent ion of As, (v) said pentavalent ion of Sb, (vi) said pentavalent ion of Bi, (vii) said ion of Pr, and (viii) said ion of Tm is substituting for 0.01% to 3.00% of said one of Al and Mg.
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5. A blue phosphor that is excitable by ultraviolet rays so as to emit visible light, said blue phosphor having a crystal structure of one of Ba1−
- xMgAl10O17;
Eux and Ba1−
x−
ySryMgAl10O17;
Eux,wherein at least one of (i) a pentavalent ion of Nb, (ii) a pentavalent ion of Ta, (iii) a pentavalent ion of P, (iv) a pentavalent ion of As, (v) a pentavalent ion of Sb, (vi) a pentavalent ion of Bi, (vii) an ion of Pr, and (viii) an ion of Tm is substituting for a part of one of Al and Mg, and wherein 0.03≦
x≦
0.2 and 0.1≦
y≦
0.5.- View Dependent Claims (6, 7, 8)
is substituting for a part of said one of Al and Mg. -
7. The blue phosphor according to claim 6, wherein
said at least one of (i) said pentavalent ion of Nb, (ii) said pentavalent ion of Ta, (iii) said pentavalent ion of P, (iv) said pentavalent ion of As, (v) said pentavalent ion of Sb, and (vi) said pentavalent ion of Bi is substituting for 0.01% to 3.00% of said one of Al and Mg. -
8. The blue phosphor according to claim 5, wherein
said at least one of (i) said pentavalent ion of Nb, (ii) said pentavalent ion of Ta, (iii) said pentavalent ion of P, (iv) said pentavalent ion of As, (v) said pentavalent ion of Sb, (vi) said pentavalent ion of Bi, (vii) said ion of Pr, and (viii) said ion of Tm is substituting for 0.01% to 3.00% of said one of Al and Mg.
- xMgAl10O17;
-
9. A method of manufacturing a phosphor having a crystal structure of one of Ba1−
- xMgAl10O17;
Eux and Ba1−
x−
ySryMgAl10O17;
Eux, with 0.03≦
x≦
0.2 and 0.1≦
y≦
0.5 comprising;firing, as raw materials of blue phosphor, a mixture of BaCO3, MgCO3, Al2O3, Eu2O3 and M2O5, together with a flux, with M being one of (i) a pentavalent ion of Nb, (ii) a pentavalent ion of Ta, (iii) a pentavalent ion of P, (iv) a pentavalent ion of As, (v) a pentavalent ion of Sb, and (vi) a pentavalent ion of Bi, so as to obtain a fired mixture; crushing and sieving said fired mixture so as to obtain a crushed and sieved fired mixture; firing said crushed and sieved fired mixture in a reducing atmosphere so as to obtain a product; crushing and sieving said product so as to obtain a burnt product; and firing said burnt product in an oxidizing atmosphere. - View Dependent Claims (14)
- xMgAl10O17;
-
10. A method of manufacturing a phosphor having a crystal structure of one of Ba1−
- xMgAl10O17;
Eux and Ba1−
x−
ySryMgAl10O17;
Eux, with 0.03≦
x≦
0.2 and 0.1≦
y≦
0.5 comprising;preparing a mixed solution by dissolving in an aqueous medium (i) barium nitrate, magnesium nitrate, aluminum nitrate and europium nitrate as raw materials of a blue phosphor, and (ii) one of a nitrate, chloride and organic compound including one of (a) a pentavalent ion of Nb, (b) a pentavalent ion of Ta, (c) a pentavalent ion of P, (d) a pentavalent ion of As, (e) a pentavalent ion of Sb, (f) a pentavalent ion of Bi, (g) an ion of Pr, and (h) an ion of Tm, as a raw material for substituting for part of one of aluminum and magnesium; in a corrosion-resistant and heat-resistant vessel, subjecting said mixed solution to a hydrothermal synthesis reaction at a temperature of from 100°
C.–
350°
C. and under a pressure of from 0.2 MPa–
25.0 Mpa, so as to obtain a blue phosphor product;annealing said blue phosphor product at a temperature of from 1,350°
C.–
1,600°
C. in a reducing atmosphere so as to obtain an annealed blue phosphor product; andclassifying said annealed blue phosphor product, wherein said one of (a) said pentavalent ion of Nb, (b) said pentavalent ion of Ta, (c) said pentavalent ion of P, (d) said pentavalent ion of As, (e) said pentavalent ion of Sb, (f) said pentavalent ion of Bi, (g) said ion of Pr, and (h) said ion of Tm substitutes for part of one of aluminum and magnesium. - View Dependent Claims (11, 12, 13, 15, 16, 17, 18)
substitutes for 0.01% to 3.00% of said one of aluminum and magnesium. -
12. The method according to claim 10, wherein
said one of a nitrate, chloride and organic compound includes one of (a) said pentavalent ion of Nb, (b) said pentavalent ion of Ta, (c) said pentavalent ion of P, (d) said pentavalent ion of As, (e) said pentavalent ion of Sb, and (f) said pentavalent ion of Bi. -
13. The method according to claim 12, wherein
said one of (a) said pentavalent ion of Nb, (b) said pentavalent ion of Ta, (c) said pentavalent ion of P, (d) said pentavalent ion of As, (e) said pentavalent ion of Sb, and (f) said pentavalent ion of Bi substitutes for 0.01% to 3.00% of said one of aluminum and magnesium. -
15. The method according to claim 10, wherein
the method is for manufacturing a phosphor having the crystal structure of Ba1− - xMgAl10O17;
Eux.
- xMgAl10O17;
-
16. The method according to claim 15, wherein
said one of (a) said pentavalent ion of Nb, (b) said pentavalent ion of Ta, (c) said pentavalent ion of P, (d) said pentavalent ion of As, (e) said pentavalent ion of Sb, (f) said pentavalent ion of Bi, (g) said ion of Pr, and (h) said ion of Tm substitutes for 0.01% to 3.00% of said one of aluminum and magnesium. -
17. The method according to claim 16, wherein
annealing said blue phosphor product at a temperature of from 1,350° - C.–
1,600°
C. in an atmosphere including nitrogen and hydrogen comprises annealing said blue phosphor product at a temperature of from 1,350°
C.–
1,600°
C. in an atmosphere including 95% nitrogen and 5% hydrogen.
- C.–
-
18. The method according to claim 10, wherein
annealing said blue phosphor product at a temperature of from 1,350° - C.–
1,600°
C. in an atmosphere including nitrogen and hydrogen comprises annealing said blue phosphor product at a temperature of from 1,350°
C.–
1,600°
C. in an atmosphere including 95% nitrogen and 5% hydrogen.
- C.–
- xMgAl10O17;
Specification