US4572803A
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Organic rare-earth salt phosphor
Assignee: Asahi Kasei Corp
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Filing: 1982-06-30
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Granted: 1986-02-25
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Expires: 2002-06-30
Abstract
Abstract Rare-earth metal salts of organic carboxylic acids of this invention constitute themselves phosphors which exhibit unusually high luminescence efficiency, excel in chemical and physical stability and weatherability, show high affinity for other chemical substances and promise extensive usefulness in the field of high-performance luminescent products.
Inventors
- 👤 Katsuhiko Yamazoe
- 👤 Akira Yoshino
- 👤 Yoshiharu Kitahama
- 👤 Isamu Iwami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:27
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
126 words
An organic rare-earth salt phosphor comprising a crystalline rare-earth metal doped salt of an organic carboxylic acid represented by the general formula: [A(COO)].sub.m Z wherein: [A(COO)] denotes a carboxylic acid radical derived from an α,β-unsaturated carboxylic acid selected from the group consisting of cinnamic acid and 3,5-dimethoxycinnamic acid, Z denotes (L.sub.x M.sub.y.sup.3+ M.sub.1-x-y.sup.2+), providing that L is one rare-earth element selected from the group consisting of cerium, praseodymium, neodymium, samarium, europium, terbium, dysprosium, erbium, holmium, thulium and ytterbium, M 3+ is at least one trivalent metal element selected from the group consisting of yttrium, lanthanum, gadolinium and lutetium, M 2+ is at least one divalent metal element selected from the group consisting of calcium, strontium and barium, x is a value within the range of 0.04≦x<1.
Claim 2
Dependent Claim
126 words
An organic rare-earth salt phosphor comprising a crystalline rare-earth metal doped salt of an organic carboxylic acid represented by the general formula: [A(COO)].sub.m Z wherein: [A(COO)] denotes a carboxylic acid radical derived from an α,β-unsaturated carboxylic acid selected from the group consisting of cinnamic acid and 3,5-dimethoxycinnamic acid, Z denotes (L.sub.x M.sub.y.sup.3+ M.sub.1-x-y.sup.2+), providing that L is one rare-earth element selected from the group consisting of cerium, praseodymium, neodymium, samarium, europium, terbium, dysprosium, erbium, holmium, thulium and ytterbium, M 3+ is at least one trivalent metal element selected from the group consisting of yttrium, lanthanum, gadolinium and lutetium, M 2+ is at least one divalent metal element selected from the group consisting of calcium, strontium and barium, x is a value within the range of 0.04≦x<1.
Claim 3
Dependent Claim
23 words
The organic rare-earth salt phosphor according to claim 1, wherein the variable x in the general formula falls within the range of 0.15≦x<1.
Claim 4
Dependent Claim
23 words
The organic rare-earth salt phoshor according to claim 2, wherein the variable x in the general formula falls within the range of 0.35≦x<1.
Claim 5
Dependent Claim
20 words
The organic rare-earth salt phosphor according to claim 1, wherein the rare-earth element L is samarium, europium, terbium or dysprosium.
Claim 6
Dependent Claim
38 words
The organic rare-earth salt phosphor according to claim 4, wherein L is europium and M 3+ is yttrium, lanthanum, or gadolinium when the sum of the variables x and y in the general formula is the value 1.
Claim 7
Dependent Claim
33 words
The organic rare-earth salt phosphor according to claim 4, wherein L is europium and M 2+ is calcium, strontium or barium when the variable y in the general formula is the value 0.
Claim 8
Dependent Claim
49 words
The organic rare-earth salt phosphor according to claim 4, wherein L is europium and M 3+ is a combination of two members selected from the group consisting of yttrium, lanthanum and gadolinium where the sum of the variables x and y in the general formula is the value 1.
Claim 9
Dependent Claim
44 words
The organic rare-earth salt phosphor according to claim 4, wherein L is europium and M 2+ is a combination of two members selected from the group consisting of calcium, strontium and barium when the variable y in the general formula is the value 0.
Claim 10
Dependent Claim
44 words
The organic rare-earth salt phosphor according to claim 4, wherein L is europium, M 2+ is one member selected from the group consisting of calcium, strontium and barium and M 3+ is one member selected from the group consisting of yttrium, lanthanum and gadolinium.
Claim 11
Dependent Claim
13 words
The organic rare-earth salt phosphor according to claim 4, wherein L is europium.
Claim 12
Dependent Claim
17 words
The organic rare-earth salt phosphor according to claim 10, wherein the α,β-unsaturated carboxylic acid is cinnamic acid.
Claim 13
Dependent Claim
42 words
The organic rare-earth salt phosphor according to claim 11, wherein M 3+ is at least one trivalent metal element selected from the group consisting of yttrium, lanthanum and gadolinium when the sum of the variables x and y is the value 1.
Claim 14
Dependent Claim
28 words
The organic rare-earth salt phosphor according to claim 11, wherein M 2+ is calcium or strontium when the variable y in the general formula is the value 0.
Claim 15
Dependent Claim
17 words
The organic rare-earth salt phosphor according to claim 10, wherein the α,β-unsaturated carboxylic acid is 3,5-dimethoxycinnamic acid.
Claim 16
Dependent Claim
38 words
The organic rare-earth salt phosphor according to claim 4, wherein L is terbium and M 3+ is yttrium, lanthanum or gadolinium when the sum of the variables x and y in the general formula is the value 1.
Claim 17
Dependent Claim
33 words
The organic rare-earth salt phosphor according to claim 4, wherein L is terbium and M 2+ is calcium, strontium or barium when the variable y in the general formula is the value 0.
Claim 18
Dependent Claim
45 words
The organic rare-earth salt phosphor according to claim 4, wherein L is terbium and M 3+ is a combination of two members selected from the group consisting of yttrium, lanthanum and gadolinium when the sum of the variables x and y is the value 1.
Claim 19
Dependent Claim
44 words
The organic rare-earth salt phosphor according to claim 4, wherein L is terbium and M 2+ is a combination of two members selected from the group consisting of calcium, strontium and barium when the variable y in the general formula is the value 0.
Claim 20
Dependent Claim
44 words
The organic rare-earth salt phosphor according to claim 4, wherein L is terbium, M 2+ is one member selected from the group consisting of calcium, strontium and barium and M 3+ is one member selected from the group consisting of yttrium, lanthanum and gadolinium.
Claim 21
Dependent Claim
13 words
The organic rare-earth salt phoshor according to claim 4, wherein L is terbium.
References Cited (Backward Citations)
GB2061918A
Cited
NL8301295A
Cited
US4443380A
Cited
JPS5780476A
Cited
JPS5783580A
Cited
JPS57108189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |