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US4231892A
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Manganese doped zinc silicate luminescent phosphors with III-V oxide substitutions
Assignee: International Business Machines Corp
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Filing: 1979-03-05
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Granted: 1980-11-04
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Expires: 1999-03-05
Abstract
Abstract A series of solid solutions in the systems Zn 2 SiO 4 -Zn 2 M +3 .sub..5 M +5 .sub..5 O 4 , is synthesized by practice of this disclosure. Solid reaction technique is used where M +3 and M +5 signify ions from Groups III and V of the periodic table. Large increases in the efficiency compared to the prior art P1 phosphor (Zn 2 SiO 4 :Mn) are achieved by substituting various combinations of Group III and V oxides for SiO 2 , e.g., Al and P to provide Zn 2-y Mn y Si 1-2x Al x P x O 4 . The photoluminescence efficiency of the phosphors of this disclosure exhibit strong dependence on the III-V substitution concentration, x, having highest efficiency for the approximate range of x=0.25% to 1.5%.
Inventors
- 👤 Ifay F. Chang
- 👤 Merrill W. Shafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:51
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0838; C09K11/59; C09K11/592; C09K11/595; C09K11/63; C09K11/636; C09K11/64; C09K11/646; C09K11/70; C09K11/706; C09K11/71; C09K11/717; C09K11/74; C09K11/7442; C09K11/75; C09K11/757
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
Luminescent composition of a solid solution comprising Zn 2-y Mn y Si 1-2x Al x P x O 4 having a willemite crystal structure wherein 0<y≦0.25 and 0<x<0.5, wherein x is an amount sufficient to effect a luminescence efficiency that is greater than said composition absent Al and P, and wherein y is an amount sufficient to effect an emission peaked near 5230 A.
Claim 2
Dependent Claim
64 words
Luminescent composition of a solid solution comprising Zn 2-y Mn y Si 1-2x Al x P x O 4 having a willemite crystal structure wherein 0<y≦0.25 and 0<x<0.5, wherein x is an amount sufficient to effect a luminescence efficiency that is greater than said composition absent Al and P, and wherein y is an amount sufficient to effect an emission peaked near 5230 A.
Claim 3
Dependent Claim
10 words
Luminescent composition as set forth in claim 1 wherein: 0<x<0.15.
Claim 4
Dependent Claim
90 words
Luminescent composition of a solid solution comprising Zn 2-y Mn y Si 1-2x M x +3 M x +5 O 4 , having a willemite crystal structure, wherein M +3 and M +5 are ions from Groups IIIA and VA of the periodic table of the elements, wherein 0<y≦0.25 and 0<x<0.5, wherein x is an amount sufficient to effect a luminescence efficiency that is greater than said composition absent M +3 and M +5 , and wherein y is an amount sufficient to effect an emission peaked near 5230 A.
Claim 5
Dependent Claim
90 words
Luminescent composition of a solid solution comprising Zn 2-y Mn y Si 1-2x M x +3 M x +5 O 4 , having a willemite crystal structure, wherein M +3 and M +5 are ions from Groups IIIA and VA of the periodic table of the elements, wherein 0<y≦0.25 and 0<x<0.5, wherein x is an amount sufficient to effect a luminescence efficiency that is greater than said composition absent M +3 and M +5 , and wherein y is an amount sufficient to effect an emission peaked near 5230 A.
Claim 6
Dependent Claim
77 words
Luminescent composition of a solid solution comprising Zn 2-y Mn y Si 1-2x (Z) xx O 4 , having a willemite crystal structure, wherein Z is selected from the group consisting of AlP, GaAs, BP, GaP, BAs, and AlAs, wherein 0<y≦0.25 and 0<x<0.5, wherein x is an amount sufficient to effect a luminescence efficiency that is greater than said phosphor absent z, and wherein y is an amount sufficient to effect an emission peaked near 5230 A.
Claim 7
Dependent Claim
77 words
Luminescent composition of a solid solution comprising Zn 2-y Mn y Si 1-2x (Z) xx O 4 , having a willemite crystal structure, wherein Z is selected from the group consisting of AlP, GaAs, BP, GaP, BAs, and AlAs, wherein 0<y≦0.25 and 0<x<0.5, wherein x is an amount sufficient to effect a luminescence efficiency that is greater than said phosphor absent z, and wherein y is an amount sufficient to effect an emission peaked near 5230 A.
Claim 8
Dependent Claim
181 words
Method of preparing luminescent phosphor composition consisting of the steps of: forming M 3 M 5 O 4 from M +3 oxide and M +5 oxide, wherein M +3 and M +5 are ions from Groups IIIA and VA of the periodic table of the elements; and reacting ZnCO 3 , SiO 2 , MnCO 3 with M 3 M 5 O 4 to form Zn 2-y Mn y Si 1-2x M x +3 M x +5 O 4 , having a willemite crystal structure wherein 0<y≦0.25 and 0<x<0.5, wherein x is an amount sufficient to effect a luminescence efficiency that is greater than said composition absent M +3 and M +5 , wherein y is an amount sufficient to effect an emission peaked near 5230 A, and wherein said reacting comprises reacting ZnCO 3 , SiO 2 , MnCO 3 and M 3 M 5 O 4 ; at sufficiently elevated first temperatures to calcine them, and pressing the calcined material and firing it at higher second elevated temperatures until a single phase product with said willemite structure is formed.
Claim 9
Dependent Claim
181 words
Method of preparing luminescent phosphor composition consisting of the steps of: forming M 3 M 5 O 4 from M +3 oxide and M +5 oxide, wherein M +3 and M +5 are ions from Groups IIIA and VA of the periodic table of the elements; and reacting ZnCO 3 , SiO 2 , MnCO 3 with M 3 M 5 O 4 to form Zn 2-y Mn y Si 1-2x M x +3 M x +5 O 4 , having a willemite crystal structure wherein 0<y≦0.25 and 0<x<0.5, wherein x is an amount sufficient to effect a luminescence efficiency that is greater than said composition absent M +3 and M +5 , wherein y is an amount sufficient to effect an emission peaked near 5230 A, and wherein said reacting comprises reacting ZnCO 3 , SiO 2 , MnCO 3 and M 3 M 5 O 4 ; at sufficiently elevated first temperatures to calcine them, and pressing the calcined material and firing it at higher second elevated temperatures until a single phase product with said willemite structure is formed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |