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US5478499A
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Low-velocity electron excited phosphor of blue luminous color
Assignee: Futaba Corp
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Filing: 1994-05-24
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Granted: 1995-12-26
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Expires: 2014-05-24
Abstract
Abstract A low-velocity electron excited phosphor capable of exhibiting increased luminance and a stabilized blue tone. The phosphor is formed of ZnO.Ga 2 O 3 doped with Li and P, wherein the Li and P are doped in amounts of 500 to 2300 ppm and 100 ppm or less, respectively. Such construction permits the phosphor to exhibit a blue luminous color of a desirable tone having a value y of 0.05 to 0.25 in a CIE chromaticity diagram.
Inventors
- 👤 Yoshitaka Satoh
- 👤 Hitoshi Toki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:00
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/62; C09K11/621; C09K11/623
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
A low-velocity electron excited phosphor of a blue luminous color consisting essentially of: a matrix represented by a general formula ZnO.Ga 2 O 3 ; and Li and P each doped in said matrix; said Li being doped in an amount of 800 to 2300 ppm; and said P being doped in an amount of 80 ppm or less.
Claim 2
Dependent Claim
59 words
A low-velocity electron excited phosphor of a blue luminous color consisting essentially of: a matrix represented by a general formula ZnO.Ga 2 O 3 ; and Li and P each doped in said matrix; said Li being doped in an amount of 800 to 2300 ppm; and said P being doped in an amount of 80 ppm or less.
Claim 3
Dependent Claim
31 words
A low-velocity electron excited phosphor of a blue luminous color as defined in claim 1, wherein a molar ratio between ZnO and Ga 2 O 3 in said matrix is 0.73-0.87:1.
References Cited (Backward Citations)
US5051203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |