US5104573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Green light emitting phosphor
Assignee: Sony Corp
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Filing: 1989-10-16
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Granted: 1992-04-14
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Expires: 2009-10-16
Abstract
Abstract A green light emitting phosphor comprising tetravalent elements added to a green light emitting phosphor, Y 3 (Al,Ga) 5 O 12 :Tb, wherein the green light emitting phosphor can prevent a so-called electron beam burning even when excited by electron beams of high energy. The green light emitting phosphor is, particularly suitable to be applied to a projector tube or a high-brightness phosphor display tube.
Inventors
- 👤 Katsutoshi Ono
- 👤 Tomohiko Abe
- 👤 Tsuneo Kusunoki
- 👤 Yuichi Kimizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7774
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A green light emitting phosphor of the formula Y 3 (Al,Ga) 5 O 12 :Tb, and a tetravalent element incorporated therein during its preparation selected from the group consisting of Ti 4+ , Hf 4+ , and Sn 4+ , said tetravalent element being present in an amount so that the molar ratio of the tetravalent element to the sum of the Tb and Y is in a range of approximately 1×10 -5 to about 5×10 -1 , said amount being sufficient to reduce electron-burning of the phosphor when it is irradiated with an electron beam.
Claim 2
Dependent Claim
96 words
A green light emitting phosphor of the formula Y 3 (Al,Ga) 5 O 12 :Tb, and a tetravalent element incorporated therein during its preparation selected from the group consisting of Ti 4+ , Hf 4+ , and Sn 4+ , said tetravalent element being present in an amount so that the molar ratio of the tetravalent element to the sum of the Tb and Y is in a range of approximately 1×10 -5 to about 5×10 -1 , said amount being sufficient to reduce electron-burning of the phosphor when it is irradiated with an electron beam.
Claim 3
Dependent Claim
27 words
A green light emitting phosphor according to claim 1, wherein the molar ratio is in a range of from approximately 1×10 -5 to about 1×10 -3 .
Claim 4
Dependent Claim
17 words
A green light emitting phosphor according to claim 1, wherein the tetravalent element is Ti 4+ .
Claim 5
Dependent Claim
17 words
A green light emitting phosphor according to claim 1, wherein the tetravalent element is Hf 4+ .
Claim 6
Dependent Claim
17 words
A green light emitting phosphor according to claim 1, wherein the tetravalent element is Sn 4+ .
References Cited (Backward Citations)
US3887753A
Cited
US4093890A
Cited
JPS5618677A
Cited
GB2149416A
Cited
US4707635A
Cited
US4924139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-14 | 1995-10-14 | 1996-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-14 | 1999-10-14 | 2000-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-14 | 2003-10-14 | 2004-04-14 | $7700.00 | Window Closed / Lapsed |