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US5439616A
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Infrared light-excited light-emitting substance
Assignee: Mitsubishi Materials Corp
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Filing: 1994-08-03
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Granted: 1995-08-08
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Expires: 2014-08-03
Abstract
Abstract An infrared light-excited light-emitting substance given by the general formula: R1xR2(1-x)BazCl3+2z where R1 is a rare-earth element, x satisfies the relation 0.01<x</=1, R2 is another rare-earth element, and z satisfies the relation 1<z<4. Preferably, the substance is a transparent crystal having a transparency exceeding 70% in a wavelength range from 400 to 1500 nm, excluding wavelengths absorbed by rare-earth ions. The light-emitting substance can convert infrared light into visible light in a wavelength range from blue light to green light at a high conversion efficiency.
Inventors
- 👤 Shoji Ishiwata
- 👤 Etsuji Kimura
- 👤 Michihiro Tanaka
- 👤 Yasuhiro Hanaue
- 👤 Yuhu Wang
- 👤 Shinobu Nagahama
- 👤 Naruhito Sawanobori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:30
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; H01S3/1688; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7704; C09K11/7705; C09K11/7766; C09K11/7772; C09K11/7773; C30; C30B; C30B11/00; C30B11/02; C30B29/00; C30B29/10; C30B29/12; C30B29/60; C30B29/62; H01S3/1601; H01S3/1603
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
44 words
An infrared light-excited light-emitting substance expressed by a general formula given by R1.sub.x R2.sub.(1-x) Ba.sub.z Cl.sub.3+2z where R1 is at least one light-emitting rare-earth element x, satisfies a relation 0.01<x≦1, R2 is at least one emission-assisting rare-earth element, and z satisfies a relation 1<z<4.
Claim 2
Dependent Claim
44 words
An infrared light-excited light-emitting substance expressed by a general formula given by R1.sub.x R2.sub.(1-x) Ba.sub.z Cl.sub.3+2z where R1 is at least one light-emitting rare-earth element x, satisfies a relation 0.01<x≦1, R2 is at least one emission-assisting rare-earth element, and z satisfies a relation 1<z<4.
Claim 3
Dependent Claim
44 words
The infrared light-excited light-emitting substance of claim 1, wherein said z of said general formula is equal to 2, and wherein said light-emitting substance has a transmissivity exceeding 70% in a wavelength range from 400 to 1500 nm, excluding wavelengths absorbed by rare-earth ions.
Claim 4
Dependent Claim
29 words
The infrared light-excited light-emitting substance of claim 2, wherein said R1 includes at least one rare-earth element selected from the group consisting of Er, Tm, Ho, Nd, and Pr.
Claim 5
Dependent Claim
30 words
The infrared light-excited light-emitting substance of claim 2, wherein said R2 includes of least one rare-earth element selected from the group consisting of Yb, Gd, Y, Lu, Ce, and La.
Claim 6
Dependent Claim
29 words
The infrared light-excited light-emitting substance of claim 2, wherein said R1 includes at least one element selected from the group consisting of Er, Tm, and Ho, and wherein x=1.
Claim 7
Dependent Claim
43 words
The infrared light-excited light-emitting substances of claim 2, wherein said R1 includes at least one element selected from the group consisting of Er, Tm and Ho; and said R2 includes at least one element selected from the group consisting of Yb and Gd.
Claim 8
Dependent Claim
35 words
The infrared light-excited light-emitting substance of claim 2, wherein said R1 is a compound including Er and Tm; and said R2 includes at least one element selected from the group consisting of Yb and Gd.
Claim 9
Dependent Claim
13 words
A substance as claimed in claim 1, wherein z is equal to two.
Claim 10
Dependent Claim
26 words
A substance as claimed in claim 1, wherein R1 includes at least one element selected from the group consisting of Er, Tm, Ho, Nd and Pr.
Claim 11
Dependent Claim
27 words
A substance as claimed in claim 1, wherein R2 includes at least one element selected from the group consisting of Yb, Gd, Y, Lu, Ce and La.
Claim 12
Dependent Claim
9 words
A substance as claimed in claim 9, wherein x=1.
Claim 13
Dependent Claim
29 words
A substance as claimed in claim 8, wherein R1 includes Er and Tm and R2 includes at least one element selected from the group consisting of Yb and Gd.
Claim 14
Dependent Claim
39 words
An infrared light-excited, light-emitting substance having a chemical formula of R1Ba.sub.2 Cl.sub.7 wherein R1 is a rare earth element group including at least one rare earth element selected from the group consisting of Er, Tm, Ho, Nd and Pr.
Claim 15
Dependent Claim
39 words
An infrared light-excited, light-emitting substance having a chemical formula of R1Ba.sub.2 Cl.sub.7 wherein R1 is a rare earth element group including at least one rare earth element selected from the group consisting of Er, Tm, Ho, Nd and Pr.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-07 | 1999-02-06 | 1999-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-07 | 2003-02-06 | 2003-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-07 | 2007-02-06 | 2007-08-08 | $7700.00 | Window Closed / Lapsed |