Low-velocity electron excited fluorescent display device
First Claim
1. A low-velocity electron excited fluorescent display device comprising an anodic plate having a fluorescent screen on one side thereof, a cathode standing face to face with said fluorescent screen and a sealed evacuated tube in which said anodic plate and said cathode are enclosed wherein said fluorescent screen is comprised of a fluorescent composition comprising a mechanical mixture of indium oxide (In2 O3) and a silver activated zinc sulfide phosphor (ZnS:
- Ag) said indium oxide and said phosphor being present in a weight ratio of 1;
9 to 9;
1, the amount of silver contained in said phosphor being from 10-5 to 10-3 gram per one gram of zinc sulfide.
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Abstract
Fluorescent compositions which contain indium oxide and one phosphor selected from the group hereinafter defined in a weight ratio within the range of 1/9 to 9/1, and fluorescent display devices having said fluorescent compositions in the form of a fluorescent screen, which can emit green, blue or red light under low-velocity electron excitation, said group consisting of a terbium activated lanthanum oxysulfide phosphor or a terbium activated lanthanum yttrium oxysulfide phosphor [(La1-x,Yx)2 O2 S:Tb, wherein 0≦x<1], a copper and aluminium activated zinc cadmium sulfide phosphor [(Zn1-x,Cdx)S:Cu, Al, wherein 0≦x≦0.1], a europium activated strontium gallium sulfide phosphor (SrGa2 S4 :Eu2+), a cerium activated yttrium aluminium gallate phosphor [Y3 (Al1-y,Gay)5 O12 :Ce, wherein 0≦y≦0.5], a manganese activated zinc silicate phosphor (Zn2 SiO4 :Mn), a terbium activated yttrium oxysulfide phosphor (Y2 O2 S:Tb), a silver activated zinc sulfide phosphor (ZnS:Ag), a europium activated yttrium oxysulfide phosphor (Y2 O2 S:Eu), a europium activated yttrium oxide phosphor (Y2 O3 :Eu), and a europium activated yttrium vanadate phosphor (YVO4 :Eu).
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Citations
2 Claims
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1. A low-velocity electron excited fluorescent display device comprising an anodic plate having a fluorescent screen on one side thereof, a cathode standing face to face with said fluorescent screen and a sealed evacuated tube in which said anodic plate and said cathode are enclosed wherein said fluorescent screen is comprised of a fluorescent composition comprising a mechanical mixture of indium oxide (In2 O3) and a silver activated zinc sulfide phosphor (ZnS:
- Ag) said indium oxide and said phosphor being present in a weight ratio of 1;
9 to 9;
1, the amount of silver contained in said phosphor being from 10-5 to 10-3 gram per one gram of zinc sulfide. - View Dependent Claims (2)
- Ag) said indium oxide and said phosphor being present in a weight ratio of 1;
Specification
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- Resources
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Current AssigneeDAI Nippon Toryo Company Limited
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Original AssigneeDAI Nippon Toryo Company Limited
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InventorsNarita, Kinichiro, Hase, Takashi, Mimura, Yoshiyuki, Kagami, Akiyasu, Hiraki, Minoru
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Primary Examiner(s)Cooper, Jack
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Application NumberUS05/889,540Time in Patent Office817 DaysField of Search252/301.6 S, 313/496, 313/495US Class Current313/495CPC Class CodesC09K 11/025 non-luminescent particle co...C09K 11/0805 ChalcogenidesC09K 11/584 with zinc or cadmiumC09K 11/59 containing siliconC09K 11/642 with zinc or cadmiumC09K 11/7729 ChalcogenidesC09K 11/7731 with alkaline earth metalsC09K 11/7771 OxysulfidesC09K 11/7776 Vanadates; Chromates; Molyb...C09K 11/7787 Oxides C09K11/7785 takes pr...C09K 11/7789 OxysulfidesC09K 11/7794 Vanadates; Chromates; Molyb...
