EP0266812A1
Expired / Lapsed
EP
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Luminescent alumino-silicate and/or alumino-borate glass comprising lanthanum and/or gadolinium and luminescent screen provided with such a glass
Assignee: Koninklijke Philips NV
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Filing: 1987-10-05
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Granted: —
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Expires: 2007-10-05
Abstract
Abstract Luminescent alumino-silicate and/or alumino-borate glass comprising lanthanum and/or gadolinium and activated by Tb³⁺ and/or Ce³⁺ having a composition comprising 35-85 mol.% of SiO₂ and/or B₂O₃, 1-35 mol% of La₂O₃ and/or Gd₂O₃, 5-45 mol% of Al₂O₃ and 0.5-30 mol% of Tb₂O₃ and/or Ce₂O₃. The La₂O₃ and/or Gd₂O₃ may be replaced up to not more than 50 mol% by Y₂O₃, Sc₂O₃, Lu₂O₃ ZrO₂, P₂O₅ and/or alkaline earth metal oxides. The luminescent glass can be used in a luminescent screen, for example, the luminescent screen of a low-pressure mercury vapour discharge lamp.
Inventors
- 👤 Gerrit Oversluizen
- 👤 Anne-Marie Andree Van Dongen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 09:15
CPC Classifications
H; H01; H01J; H01J63/00; H01J63/02; H01J63/04; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C3/12; C03C3/14; C03C3/15; C03C4/00; C03C4/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A luminescent alumino-silicate and/or alumino-borate glass comprising lanthanum and/or gadolinium and activated by a rare earth metal, characterized in that the glass is activated by at least one of the rare earth metals Tb³⁺ and Ce³⁺ and has a composition comprising 35-85 mol% of SiO₂ and/or B₂O₃, 1-35 mol% of La₂O₃ and/or Gd₂O₃, 5-45 mol% of Al₂O₃ and 0.5-30 mol% of Tb₂O₃ and/or Ce₂O₃, in which the La₂O₃ and/or Gd₂O₃ may be replaced up to not more than 50 mol% by one or more of the oxides Y₂O₃, Sc₂O₃, Lu₂O₃, ZrO₂, P₂O₅ and the alkaline earth metal oxides.
Claim 2
Dependent Claim
98 words
A luminescent alumino-silicate and/or alumino-borate glass comprising lanthanum and/or gadolinium and activated by a rare earth metal, characterized in that the glass is activated by at least one of the rare earth metals Tb³⁺ and Ce³⁺ and has a composition comprising 35-85 mol% of SiO₂ and/or B₂O₃, 1-35 mol% of La₂O₃ and/or Gd₂O₃, 5-45 mol% of Al₂O₃ and 0.5-30 mol% of Tb₂O₃ and/or Ce₂O₃, in which the La₂O₃ and/or Gd₂O₃ may be replaced up to not more than 50 mol% by one or more of the oxides Y₂O₃, Sc₂O₃, Lu₂O₃, ZrO₂, P₂O₅ and the alkaline earth metal oxides.
Claim 3
Dependent Claim
35 words
A luminescent glass as claimed in Claim 1, characterized in that the glass comprises 50-80 mol% of SiO₂ and/or B₂O₃, 1-20 mol% of La₂O₃, 10-30 mol% of Al₂O₃ and 0.5-15 mol% of Tb₂O₃ and/or Ce₂O₃.
Claim 4
Dependent Claim
21 words
A luminescent screen having a luminescent layer comprising a luminescent alumino-silicate and/or alumino-borate glass as claimed in Claim 1 or 2.
References Cited (Backward Citations)
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