Phosphor for display and field-emission display
First Claim
Patent Images
1. A phosphor for a display, which is provided with a zinc sulfide phosphor which is excited by an electron beam having an acceleration voltage of 3 kV to 15 kV to emit blue light, whereinthe zinc sulfide phosphor has a crystal structure of a hexagonal system and a composition indicated by the general formula:
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ZnS;
Aga,Mb,Alc
where, M indicates at least one element selected from Au and Cu, a, b and c indicate an amount against 1 g of zinc sulfide which is a mother phosphor, Ag indicates a range of 1×
10−
6≦
a≦
2×
10−
3 g, M indicates a range of 0≦
3×
10−
5 g, and Al indicates a arange of 1×
10−
5≦
c≦
5×
10−
3 g
.
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Accused Products
Abstract
Phosphors for a display, which emit blue light and green light, comprise zinc sulfide phosphors having a crystal structure of a hexagonal system. The zinc sulfide phosphor which emits blue light has an average particle diameter in a range of (0.0169×VE1.9+2.49)±20%[μm] when an electron beam has an acceleration voltage VE. The zinc sulfide phosphor which emits green light has an average particle diameter in a range of (0.017×VE1.9+2.58)±20%[μm]. A phosphor for a display, which emits red light, comprises a yttrium oxysulfide phosphor or a yttrium oxide phosphor and has an average particle diameter in a range of (0.023×VE1.95+2.88)±20%[μm]. These phosphors for a display are used for a display which has an electron beam having an acceleration voltage of 3 kV to 15 kV as an excitation source.
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Citations
13 Claims
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1. A phosphor for a display, which is provided with a zinc sulfide phosphor which is excited by an electron beam having an acceleration voltage of 3 kV to 15 kV to emit blue light, wherein
the zinc sulfide phosphor has a crystal structure of a hexagonal system and a composition indicated by the general formula: -
ZnS;
Aga,Mb,Alc
where, M indicates at least one element selected from Au and Cu, a, b and c indicate an amount against 1 g of zinc sulfide which is a mother phosphor, Ag indicates a range of 1×
10−
6≦
a≦
2×
10−
3 g, M indicates a range of 0≦
3×
10−
5 g, and Al indicates a arange of 1×
10−
5≦
c≦
5×
10−
3 g
.- View Dependent Claims (2, 3, 4, 5, 6)
where, a, d and c indicate an amount against 1 g of zinc sulfide which is a mother phosphor, Ag is in a range of 1×
10−
6≦
a≦
2×
10−
3 g, Au is in a range of 0≦
d≦
1.5×
10−
5 g, and Al is in a range of 1×
10−
5≦
c≦
5×
10−
3 g
.
-
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5. The phosphor for a display according to claim 1, wherein the zinc sulfide phosphor for blue light emission has a composition indicated by the general formula:
-
ZnS;
Aga,Cue,Alc
where, a, e and c indicate an amount against 1 g of zinc sulfide which is a mother phosphor, Ag is in a range of 1×
10−
6≦
a≦
2×
10−
3 g, Cu is in a range of 0≦
e≦
0.5×
10−
5 g, and Al is in a range of 1×
10−
5≦
c≦
5×
10−
3 g
.
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6. The phosphor for a display according to claim 1, wherein the zinc sulfide phosphor is excited by emitting the electron beam and emits blue light which has emission chromaticity with an x value in a range of 0.15 to 0.17 and a y value in a range of 0.035 to 0.075 in CIE chromaticity value.
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7. A phosphor for a display, which is provided with a zinc sulfide phosphor which is excited by an electron beam having an acceleration voltage of 3 kV to 15 kV to emit green light, wherein
the zinc sulfide phosphor has a crystal structure of a hexagonal system and a composition indicated by the general formula: -
ZnS;
Cuf,Aug,Alhwhere, f, g and h indicate an amount against 1 g of zinc sulfide which is a mother phosphor, Cu is in a range of 1×
10−
5≦
f≦
1×
10−
3 g, Au is in a range of 0≦
g≦
3×
10−
4 g, and Al is in a range of 1×
10−
5≦
h≦
5×
10−
3 g.- View Dependent Claims (8, 9, 10)
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11. A field-emission display comprising:
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a back substrate having electron emission elements;
a front substrate which is disposed to face the electron emission elements and has a phosphor layer which emits light by an electron beam emitted from the electron emission elements; and
means which seal airtight a gap between the back substrate and the front substrate, wherein the phosphor layer contains at least one selected from a blue light emission component having a phosphor for a display, which is provided with a zinc sulfide phosphor which is excited by an electron beam having an acceleration voltage of 3 kV to 15 kV to emit blue light, where the zinc sulfide phosphor has a crystal structure of a hexagonal system and a composition indicated by the general formula;
ZnS;
Aga,Mb,Alc
where, M indicates at least one element selected from Au and Cu, a, b and c indicate an amount against 1 g of zinc sulfide which is a mother phosphor, Ag indicates a range of 1×
10−
6≦
a≦
2×
10−
3 g, M indicates a range of 0≦
b≦
3×
10−
5 g, and Al indicates a range of 1×
10−
5≦
c≦
5×
10−
3 g
; and
a green light emission component having a phosphor for a display, which is provided with a zinc sulfide phosphor which is excited by an electron beam having an acceleration voltage of 3 kV to 15 kV to emit green light, where the zinc sulfide phosphor has a crystal structure of a hexagonal system and a composition indicated by the general formula;
ZnS;
Cuf,Aug,Alh
where, f, g and h indicate an amount aaainst 1 g of zinc sulfide which is a mother phosphor, Cu is in a range of 1×
10−
5≦
f≦
1×
10−
3 g, Au is in a range of 0≦
g≦
3×
10−
4 g, and Al is in a range of 1×
10−
5≦
h≦
5×
10−
3 g. - View Dependent Claims (12, 13)
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Specification
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Current AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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Original AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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InventorsYamaguchi, Kenichi, Matsuura, Susumu, Ito, Takeo, Inoue, Kiyoshi
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Primary Examiner(s)Patel, Ashok
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Application NumberUS10/240,750Publication NumberTime in Patent Office1,469 DaysField of Search313495-497, 313/486, 313/309, 313/339, 313/351, 252/301.6 S, 252/301.4 SUS Class Current313/495CPC Class CodesC09K 11/642 with zinc or cadmiumC09K 11/7784 ChalcogenidesC09K 11/7789 OxysulfidesH01J 2211/42 Fluorescent layers
