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US5424006A
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Phosphorescent phosphor
Assignee: Nemoto and Co Ltd
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Filing: 1994-02-25
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Granted: 1995-06-13
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Expires: 2014-02-25
Abstract
Abstract A phosphorescent phosphor according to the present invention includes a matrix expressed by MAl 2 O 4 in which M is at least one metal element selected from a group consisting of calcium, strontium and barium. Alternatively, a phosphorescent phosphor according to the present invention includes a matrix expressed by MAl 2 O 4 in which M is plural metal elements which are composed of magnesium and at least one metal element selected from a group consisting of calcium, strontium and barium and europium is added as an activator, further, co-activator is added.
Inventors
- 👤 Yoshihiko Murayama
- 👤 Nobuyoshi Takeuchi
- 👤 Yasumitsu Aoki
- 👤 Takashi Matsuzawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:27
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7734; C09K11/7783; C09K11/7792
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A phosphorescent phosphor comprising a matrix expressed by MAl 2 O 4 in which M is at least one metal element selected from a group consisting of calcium, strontium, and barium, wherein 0.001 % to 10% of europium is doped to said matrix expressed by MAl 2 O 4 as an activator, and wherein 0.001% to 10% of at least one element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, tin and bismuth is doped to said matrix expressed by MAl 2 O 4 as a co-activator, in terms of mol % relative to the metal element expressed by M.
Claim 2
Dependent Claim
110 words
A phosphorescent phosphor comprising a matrix expressed by MAl 2 O 4 in which M is at least one metal element selected from a group consisting of calcium, strontium, and barium, wherein 0.001 % to 10% of europium is doped to said matrix expressed by MAl 2 O 4 as an activator, and wherein 0.001% to 10% of at least one element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, tin and bismuth is doped to said matrix expressed by MAl 2 O 4 as a co-activator, in terms of mol % relative to the metal element expressed by M.
Claim 3
Dependent Claim
118 words
A phosphorescent phosphor comprising a matrix expressed by MAl 2 O 4 in which M is plural metal elements which are composed of magnesium and at least one metal element selected from a group consisting of calcium, strontium, and barium, wherein 0.001% to 10% of europium is doped to said matrix expressed by MAl 2 O 4 as an activator, and wherein 0/001% to 10% of at least one element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, tin and bismuth is doped to said matrix expressed by MAl 2 O 4 as a co-activator, in terms of mol % relative to the metal element expressed by M.
Claim 4
Dependent Claim
118 words
A phosphorescent phosphor comprising a matrix expressed by MAl 2 O 4 in which M is plural metal elements which are composed of magnesium and at least one metal element selected from a group consisting of calcium, strontium, and barium, wherein 0.001% to 10% of europium is doped to said matrix expressed by MAl 2 O 4 as an activator, and wherein 0/001% to 10% of at least one element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, tin and bismuth is doped to said matrix expressed by MAl 2 O 4 as a co-activator, in terms of mol % relative to the metal element expressed by M.
Claim 5
Dependent Claim
44 words
A phosphorescent phosphor according to claim 1 wherein said phosphorescent phosphor shows a glow peak of thermo-luminescence in a high-temperature region of 50° C. or above when irradiated by ultraviolet or visible rays having a wavelength of 200 to 450 nm at room temperatures.
Claim 6
Dependent Claim
43 words
A phosphorescent phosphor according to claim 2, wherein said phosphorescent phosphor shows a glow of thermo-luminescence in a high-temperature region of 50° C. or above when irradiated by ultraviolet or visible rays having a wavelength of 200 to 450 nm at room temperature.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-06-12 | 1998-12-12 | 1999-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-12 | 2002-12-12 | 2003-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-12 | 2006-12-12 | 2007-06-13 | $7700.00 | Window Closed / Lapsed |