US4107273A
Expired / Lapsed
US
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Fluorescent material
Assignee: Hitachi Ltd
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Filing: 1977-10-28
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Granted: 1978-08-15
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Expires: 1997-10-28
Abstract
Abstract An infrared rays excited - infrared rays emitting fluorescent material which contains predetermined quantities of neodymium and ytterbium as activators is disclosed.
Inventors
- 👤 Atsushi Suzuki
- 👤 Jean-Pierre Jeser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:58
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7777
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
An infrared ray excited - infrared ray emitting fluorescent material represented by the following formula: MM' .sub.1-x-y Nd.sub.x Yb.sub.y P.sub.4 O.sub.12 where M denotes at least one element selected from the group consisting of Li, Na, K, Rb and Cs, and M' denotes at least one element selected from the group consisting of Sc, Y, La, Ce, Gd, Lu, Ga and In, and where 0.05 ≦ x ≦ 0.999, 0.001 ≦ y ≦ 0.950, and x + y ≦ 1.0; the maximum luminescence wavelength of said fluorescent material being approximately 980 nm.
Claim 2
Dependent Claim
92 words
An infrared ray excited - infrared ray emitting fluorescent material represented by the following formula: MM' .sub.1-x-y Nd.sub.x Yb.sub.y P.sub.4 O.sub.12 where M denotes at least one element selected from the group consisting of Li, Na, K, Rb and Cs, and M' denotes at least one element selected from the group consisting of Sc, Y, La, Ce, Gd, Lu, Ga and In, and where 0.05 ≦ x ≦ 0.999, 0.001 ≦ y ≦ 0.950, and x + y ≦ 1.0; the maximum luminescence wavelength of said fluorescent material being approximately 980 nm.
Claim 3
Dependent Claim
27 words
An infrared ray excited - infrared ray emitting fluorescent material according to claim 1, wherein the material is represented by the following formula: LiNd.sub.0.9 Yb.sub.0.1 P.sub.4 O.sub.12
Claim 4
Dependent Claim
28 words
An infrared ray excited - infrared ray emitting fluorescent material according to claim 1, wherein the material is represented by the following formula: LiBi.sub.0.2 Nb.sub.0.7 Yb.sub.0.1 P.sub.4 O.sub.12
Claim 5
Dependent Claim
27 words
An infrared ray excited - infrared ray emitting fluorescent material according to claim 1, wherein the material is represented by the following formula: NaNd.sub.0.9 Yb.sub.0.1 P.sub.4 O.sub.12
References Cited (Backward Citations)
US3624549A
Cited
US4000247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-14 | 1982-02-13 | 1982-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-14 | 1986-02-13 | 1986-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-14 | 1990-02-13 | 1990-08-15 | $7700.00 | Window Closed / Lapsed |