US6469434B1
Expired / Lapsed
US
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Zinc silicate luminescent materials and related luminescent screen products
Assignee: Koninklijke Philips NV
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Filing: 1999-11-10
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Granted: 2002-10-22
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Expires: 2019-11-10
Abstract
Abstract Willemite (Zn 2 SiO 4 :Mn) is doped with one or more ions selected from the group formed by Gd 3+ , Eu 2+ , Co 2+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ . This results in a increase in absorption and quantum yield and a decrease of the decay time.
Inventors
- 👤 Helmut Bechtel
- 👤 Thomas Jüstel
- 👤 Walter Mayr
- 👤 Hans Nikol
- 👤 Cornelis R. Ronda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:05
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/46; C; C09; C09K; C09K11/00; C09K11/08; C09K11/59; C09K11/592; C09K11/595; C09K11/77; C09K11/77062; C09K11/7766; C09K11/77742
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
69 words
Luminescent material consisting essentially of zinc silicate activated with Mn 2+ , wherein the zinc silicate is doped with one or more dopant ions chosen from the group formed by Gd 3+ , Eu 2+ , Co 2+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ .
Claim 2
Dependent Claim
69 words
Luminescent material consisting essentially of zinc silicate activated with Mn 2+ , wherein the zinc silicate is doped with one or more dopant ions chosen from the group formed by Gd 3+ , Eu 2+ , Co 2+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ .
Claim 3
Dependent Claim
28 words
Luminescent material according to claim 1 wherein between 0.1% and 15% of the Zn 2+ ions of the zinc silicate have been replaced by the Mn 2+ ions.
Claim 4
Dependent Claim
31 words
Luminescent material according to claim 1 wherein between 0.05% and 5% of the Zn 2+ ions of the zinc silicate have been replaced by one or more of said dopant ions.
Claim 5
Dependent Claim
101 words
Luminescent material comprising zinc silicate activated with Mn 2+ , characterized in that the zinc silicate is doped with one or more dopant ions chosen from the group formed by Gd 3+ , Eu 2+ , Co 2+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ , wherein the zinc silicate is doped with a trivalent ion and further comprises one or more ions chosen from the group formed by Li 1+ , Na 1+ and K 1+ .
Claim 6
Dependent Claim
101 words
Luminescent material comprising zinc silicate activated with Mn 2+ , characterized in that the zinc silicate is doped with one or more dopant ions chosen from the group formed by Gd 3+ , Eu 2+ , Co 2+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ , wherein the zinc silicate is doped with a trivalent ion and further comprises one or more ions chosen from the group formed by Li 1+ , Na 1+ and K 1+ .
Claim 7
Dependent Claim
28 words
Luminescent material according to claim 4 wherein between 0.1% and 15% of the Zn 2+ ions of the zinc silicate have been replaced by the Mn 2+ ions.
Claim 8
Dependent Claim
27 words
Luminescent material according to claim 4 , wherein between 0.05% and 5% of the Zn 2+ ions of the zinc silicate have been replaced by dopant ions.
Claim 9
Dependent Claim
105 words
Luminescent screen comprising a luminescent material comprising zinc silicate activated with Mn 2+ , characterized in that the zinc silicate is doped with one or more dopant ions chosen from the group formed by Gd 3+ , Eu 2+ , Co 2+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ , wherein the zinc silicate is doped with a trivalent ion and further comprises one or more ions chosen from the group formed by Li 1+ , Na 1+ and K 1+ .
Claim 10
Dependent Claim
105 words
Luminescent screen comprising a luminescent material comprising zinc silicate activated with Mn 2+ , characterized in that the zinc silicate is doped with one or more dopant ions chosen from the group formed by Gd 3+ , Eu 2+ , Co 2+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ , wherein the zinc silicate is doped with a trivalent ion and further comprises one or more ions chosen from the group formed by Li 1+ , Na 1+ and K 1+ .
Claim 11
Dependent Claim
13 words
Plasma display panel comprising a luminescent screen as claimed in claim 7 .
Claim 12
Dependent Claim
12 words
Discharge lamp comprising a luminescent screen as claimed in claim 7 .
Claim 13
Dependent Claim
16 words
Discharge lamp according to claim 9 , comprising a gastight lamp vessel containing mercury and gas.
Claim 14
Dependent Claim
86 words
Luminescent material comprising zinc silicate activated with Mn 2+ , wherein the zinc silicate is doped with one or more trivalent dopant ions chosen from the group consisting of Gd 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ and the zinc silicate further comprises one or more ions chosen from the group consisting of Li 1+ , Na 1+ and K 1+ .
Claim 15
Dependent Claim
86 words
Luminescent material comprising zinc silicate activated with Mn 2+ , wherein the zinc silicate is doped with one or more trivalent dopant ions chosen from the group consisting of Gd 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ and the zinc silicate further comprises one or more ions chosen from the group consisting of Li 1+ , Na 1+ and K 1+ .
Claim 16
Dependent Claim
22 words
Luminescent material according to claim 11 , wherein the amount of monovalent ions is substantially equal to the amount of trivalent ions.
Claim 17
Dependent Claim
29 words
Luminescent material according to claim 11 , wherein between 0.1% and 15% of the Zn 2+ ions of the zinc silicate have been replaced by the Mn 2+ ions.
Claim 18
Dependent Claim
31 words
Luminescent material according to claim 11 , wherein between 0.05% and 5% of the Zn 2+ ions of the zinc silicate have been replaced by said one or more dopant ions.
Claim 19
Dependent Claim
92 words
Luminescent screen comprising a luminescent material, said material comprising zinc silicate activated with Mn 2+ , wherein the zinc silicate is doped with one or more trivalent dopant ions chosen from the group consisting of Gd 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ and the zinc silicate further comprises one or more ions chosen from the group consisting of Li 1+ , Na 1+ and K 1+ .
Claim 20
Dependent Claim
92 words
Luminescent screen comprising a luminescent material, said material comprising zinc silicate activated with Mn 2+ , wherein the zinc silicate is doped with one or more trivalent dopant ions chosen from the group consisting of Gd 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ and the zinc silicate further comprises one or more ions chosen from the group consisting of Li 1+ , Na 1+ and K 1+ .
Claim 21
Dependent Claim
13 words
Plasma display panel comprising a luminescent screen as claimed in claim 15 .
Claim 22
Dependent Claim
12 words
Discharge lamp comprising a luminescent screen as claimed in claim 15 .
Claim 23
Dependent Claim
16 words
Discharge lamp according to claim 17 , comprising a gastight lamp vessel containing mercury and gas.
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