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US6123872A Expired / Lapsed US ⏱️ 0.0 years remaining

Oxide phosphorescent glass capable of exhibiting a long lasting after-glow and photostimulated luminescence

Assignee: Sumita Optical Glass Inc
•
Filing: 1998-12-16
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Granted: 2000-09-26
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Expires: 2018-12-16
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Abstract

Abstract The present invention provides an oxide glass capable of exhibiting a long lasting afterglow and photostimulated phosphorescence, whereby energy can be accumulated by radiation excitation, for example, by gamma -rays, X-rays, UV-rays, etc., light emission can be continued for a long time even after stopping the excitation. Furthermore, the long lasting afterglow and photostimulated luminescence oxide glass can be used not only as a phosphorescent material for night illumination or night signal, but also as a material for confirming an infrared laser or controlling an optical axis because of exhibiting photostimulated luminescence by irradiation of infrared rays or visible rays. In addition, this glass is useful for recording or reproducing of gamma -rays, X-rays or UV-rays images. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %): - SiO2 1 to 55% - B2O3 1 to 50% (SiO2 + B2O3 = 20 to 60%) - ZnO 30 to 75% - Tb2O3 0 to 7% - MnO 0 to 2% (Tb2O3 + MnO = 0.01 to 7%) - R2O 0 to 25% (R: at least one atom selected from Li, Na, K and - Cs) - R'O 0 to 25% (R': at least one atom selected from Mg, Ca, Sr - and Ba) - Al2O3 0 to 15% - Ga2O3 0 to 15% - GeO2 0 to 20% - ZrO2 0 to 5% - Ln2O3 0 to 8% (Ln: at least one atom selected from Y, La, Gd, - Yb, Lu, Sm, Dy, Tm and Pr) and - Sb2O3 0 to 0.5%. -

Inventors

  • 👤 Masaaki Yamazaki
  • 👤 Yoshinori Yamamoto
  • 👤 Naruhito Sawanobori
  • 👤 Shinobu Nagahama

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 17:34
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/04; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/066; C03C3/068; C03C4/12; C09; C09K; C09K11/00; C09K11/08; C09K11/74; C09K11/75; C09K11/757; C09K11/77; C09K11/7743; C09K11/7755; C09K11/7766; C09K11/778

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 156 words
An oxide phosphorescent glass capable of exhibiting a long lasting afterglow and photostimulated luminescence by excitation with radiations, which is represented, in terms of atoms for making up the glass, by the following chemical composition (mol %): ______________________________________ SiO.sub.2 1 to 55% B.sub.2 O.sub.3 1 to 50% (SiO.sub.2 + B.sub.2 O.sub.3 = 20 to 60%) ZnO 30 to 75% Tb.sub.2 O.sub.3 0 to 7% MnO 0 to 2% (Tb.sub.2 O.sub.3 + MnO = 0.01 to 7%) R.sub.2 O 0 to 25% (R: at least one atom selected from Li, Na, K and CS) R'O 0 to 25% (R': at least one atom selected from Mg, Ca, Sr and Ba) Al.sub.2 O.sub.3 0 to 15% Ga.sub.2 O.sub.3 0 to 15% GeO.sub.2 0 to 20% ZrO.sub.2 0 to 5% Ln.sub.2 O.sub.3 0 to 8% (Ln: at least one atom selected from Y, La, Gd, Yb, Lu, Sm, Dy, Tm and Pr) and Sb.sub.2 O.sub.3 0 to 0.5%. ______________________________________
Claim 2
Dependent Claim 156 words
An oxide phosphorescent glass capable of exhibiting a long lasting afterglow and photostimulated luminescence by excitation with radiations, which is represented, in terms of atoms for making up the glass, by the following chemical composition (mol %): ______________________________________ SiO.sub.2 1 to 55% B.sub.2 O.sub.3 1 to 50% (SiO.sub.2 + B.sub.2 O.sub.3 = 20 to 60%) ZnO 30 to 75% Tb.sub.2 O.sub.3 0 to 7% MnO 0 to 2% (Tb.sub.2 O.sub.3 + MnO = 0.01 to 7%) R.sub.2 O 0 to 25% (R: at least one atom selected from Li, Na, K and CS) R'O 0 to 25% (R': at least one atom selected from Mg, Ca, Sr and Ba) Al.sub.2 O.sub.3 0 to 15% Ga.sub.2 O.sub.3 0 to 15% GeO.sub.2 0 to 20% ZrO.sub.2 0 to 5% Ln.sub.2 O.sub.3 0 to 8% (Ln: at least one atom selected from Y, La, Gd, Yb, Lu, Sm, Dy, Tm and Pr) and Sb.sub.2 O.sub.3 0 to 0.5%. ______________________________________

References Cited (Backward Citations)

US4751148A Cited
EP0775673A1 Cited
EP0847964A1 Cited
US5961883A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2003-09-26 2004-03-27 2004-09-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2007-09-26 2008-03-27 2008-09-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2011-09-26 2012-03-27 2012-09-26 $7700.00 Window Closed / Lapsed

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