US4278913A
Expired / Lapsed
US
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Phosphor and low-velocity electron excited fluorescent display device utilizing the same
Assignee: Japan Electronic Industry Development Association
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Filing: 1979-09-20
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Granted: 1981-07-14
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Expires: 1999-09-20
Abstract
Abstract A zinc oxide-based phosphor represented by the following formula emits yellow light of high luminance under excitation of low-velocity electrons: xMIIF2.yMIIIF3.ZnO wherein MII is at least one divalent metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, zinc and tin, MIII is at least one trivalent metal selected from the group consisting of aluminum, gallium, indium, thallium, yttrium and antimony, and x and y are numbers satisfying the conditions of 0.0001</=x+y</=0.1, 0</=x and 0<y. The zinc oxide-based phosphor is used as a fluorescent screen of a low-velocity electron excited fluorescent display device.
Inventors
- 👤 Akiyasu Kagami
- 👤 Yoshiyuki Mimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:39
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20; C; C09; C09K; C09K11/00; C09K11/08; C09K11/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A zinc oxide-based phosphor represented by the formula xM.sup.II F.sub.2.yM.sup.III F.sub.3.ZnO wherein M II is at least one divalent metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, zinc and tin; M III is at least one trivalent metal selected from the group consisting of aluminum, gallium, indium, thallium, yttrium and antimony; and x and y are numbers satisfying the conditions of 0.0001≦x+y≦0.1, 0≦x and 0<y; said phosphor emitting yellow light when excited by low velocity electrons.
Claim 2
Dependent Claim
80 words
A zinc oxide-based phosphor represented by the formula xM.sup.II F.sub.2.yM.sup.III F.sub.3.ZnO wherein M II is at least one divalent metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, zinc and tin; M III is at least one trivalent metal selected from the group consisting of aluminum, gallium, indium, thallium, yttrium and antimony; and x and y are numbers satisfying the conditions of 0.0001≦x+y≦0.1, 0≦x and 0<y; said phosphor emitting yellow light when excited by low velocity electrons.
Claim 3
Dependent Claim
21 words
A zinc oxide-based phosphor as defined in claim 1 wherein said x and y are numbers satisfying the condition of 0.001≦x+y≦0.03.
Claim 4
Dependent Claim
134 words
A low-velocity electron excited fluorescent display device having a fluorescent screen comprising a zinc oxide-based phosphor represented by the formula xM.sup.II F.sub.2.yM.sup.III F.sub.3.ZnO wherein M II is at least one divalent metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, zinc and tin; M III is at least one trivalent metal selected from the group consisting of aluminum, gallium, indium, thallium, yttrium and antimony; and x and y are numbers satisfying the conditions of 0.0001≦x+y≦0.1, 0≦x and 0<y wherein said display device is a display tube comprising an anodic plate carrying on one face thereof said fluorescent screen and a cathode disposed opposite to said screen, said anodic plate and cathode being provided in a sealed evacuated tube, and wherein said phosphor emits yellow light when excited by low velocity electrons.
Claim 5
Dependent Claim
134 words
A low-velocity electron excited fluorescent display device having a fluorescent screen comprising a zinc oxide-based phosphor represented by the formula xM.sup.II F.sub.2.yM.sup.III F.sub.3.ZnO wherein M II is at least one divalent metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, zinc and tin; M III is at least one trivalent metal selected from the group consisting of aluminum, gallium, indium, thallium, yttrium and antimony; and x and y are numbers satisfying the conditions of 0.0001≦x+y≦0.1, 0≦x and 0<y wherein said display device is a display tube comprising an anodic plate carrying on one face thereof said fluorescent screen and a cathode disposed opposite to said screen, said anodic plate and cathode being provided in a sealed evacuated tube, and wherein said phosphor emits yellow light when excited by low velocity electrons.
Claim 6
Dependent Claim
24 words
A low-velocity electron excited fluorescent display device as defined in claim 3 wherein said x and y are numbers satisfying the condition of 0.001≦x+y≦0.03.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |