EP0057610A2
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EP
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Phosphors and processes for producing same
Assignee: Hitachi Ltd
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Filing: 1982-02-02
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Granted: —
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Expires: 2002-02-02
Abstract
Abstract A phosphor represented by the formula: where A is at least one lanthanide elements, Cu, Ag, Au, Sb, Pb, Bi and Mn; and 0.05 ≤ x < 0.95, with or without a coactivator such as Ba and other elements or phosphorus halide and the like. The phosphor may be produced by firing raw materials in a strong sulfurizing atmosphere. These phosphors have high efficiencies and can be tuned to a desired hue. The phosphor may a mixture of (I-y)CaS:A and y MgS:A where 0.05 ≤ y ≤ 0.95.
Inventors
- 👤 Hiroyuki Kasano
- 👤 Koichi Megumi
- 👤 Hajime Yamamoto
- 👤 Osamu Kanehisa
- 👤 Youji Kawamata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 15:15
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0805; C09K11/0816
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
29 words
A phosphor represented by the formula: where A is at least one of lanthanide elements, Cu, Ag, Au, Sb, Pb, Bi, and Mn, and 0.05 < x < 0.95.
Claim 2
Dependent Claim
29 words
A phosphor represented by the formula: where A is at least one of lanthanide elements, Cu, Ag, Au, Sb, Pb, Bi, and Mn, and 0.05 < x < 0.95.
Claim 3
Dependent Claim
13 words
A phosphor as claimed in claim 1, wherein 0.15 < x < 0.87.
Claim 4
Dependent Claim
17 words
A phosphor as claimed in claim 1, wherein A is at least one of the lanthanide elements.
Claim 5
Dependent Claim
17 words
A phosphor as claimed in claim 3 wherein A is Eu and 0.6 ≤ x ≤ 0.95.
Claim 6
Dependent Claim
19 words
A phosphor as claimed in claim 3 wherein A is Eu and Ce and 0.6 < x < 0.95.
Claim 7
Dependent Claim
10 words
A phosphor as claimed in claim 1, wherein A.is Cu.
Claim 8
Dependent Claim
11 words
A phosphor as claimed in claim 1, wherein A is Ag.
Claim 9
Dependent Claim
11 words
A phosphor as claimed in claim 1, wherein A is Au.
Claim 10
Dependent Claim
11 words
A phosphor as claimed in claim 1, wherein A is Sb.
Claim 11
Dependent Claim
10 words
A'phosphor as claimed in claim 1, wherein A is Pb.
Claim 12
Dependent Claim
11 words
A phosphor as claimed in claim 1, wherein A is Bi.
Claim 13
Dependent Claim
11 words
A phosphor as claimed in claim 1 wherein A is Mn.
Claim 14
Dependent Claim
50 words
A phosphor as claimed in any one of claims 1,2,3 and 6 to 13, which further contains as a coactivator at least one element or compound selected from Ba, Sr, halogens, alkali metals, nitrogen halides, phosphorus halides, arsenic halides, gallium halides, indium halides, aluminum halides, selenium halides, and tellurium halides.
Claim 15
Dependent Claim
50 words
A phosphor mixture comprising (1) a component represented by the formula: (1-y)CaS:A and (2) a component represented by the formula: yMgS:A where, in each case, A is at least one of lanthanide elements, Cu, Ag, Au, Sb, Pb, Bi and Mn, and in each case 0.05 < y < 0.95.
Claim 16
Dependent Claim
50 words
A phosphor mixture comprising (1) a component represented by the formula: (1-y)CaS:A and (2) a component represented by the formula: yMgS:A where, in each case, A is at least one of lanthanide elements, Cu, Ag, Au, Sb, Pb, Bi and Mn, and in each case 0.05 < y < 0.95.
Claim 17
Dependent Claim
19 words
A phosphor mixture as claimed in claim 14 wherein A is, in each case, at least one lanthanide element.
Claim 18
Dependent Claim
17 words
A phosphor mixture as claimed in claim 14 or claim 15 wherein 0.15 < y < 0.87.
Claim 19
Dependent Claim
57 words
A phosphor mixture as claimed in any one of claims 14 to 16 where at least one of components (1) and (2) further contains as a coactivator at least one element or compound selected from Ba, Sr, halogens, alkali metals, nitrogen halides, phosphorus halides, arsenic halides, gallium halides, indium halides, aluminum halides, selenium halides, and tellurium halides.
Claim 20
Dependent Claim
61 words
A process for producing a phosphor according to any one of claims 1 to 13 comprising firing, in a sulfurizing atmosphere, (1) CaS or a Ca compound which forms CaS on firing in said atmosphere, (2) MgS or a Mg compound which forms MgS on firing in said atmosphere, and (3) the element(s) A or a compound containing the element(s) A.
Claim 21
Dependent Claim
19 words
A process as claimed in claim 18, wherein said firing is performed at a temperature from 1000 to 1350°C.
Claim 22
Dependent Claim
24 words
A process as claimed in claim 18 or claim 19 wherein said sulfurizing atmosphere comprises- at least H 2 S and CS 2 .
Claim 23
Dependent Claim
57 words
A process as claimed in claim 18 or claim 19 wherein said sulfurizing atmosphere is a mixture composed of at least one sulfurizing gas selected from H 2 S and CS 2 and at least one gas selected from inert gases and reducing gases, and said sulfurizing atmosphere contains more than 50 vol% of said sulfurizing gas.
Claim 24
Dependent Claim
30 words
A process as claimed in any one of claims 18 to 21, wherein said Ca compound is one or more of calcium carbonate, calcium sulfate, calcium nitrate and calcium oxide.
Claim 25
Dependent Claim
30 words
A process as claimed in any one of claims 18 to 22 wherein said Mg compound is one or more of magnesium carbonate, magnesium sulfate, magnesium nitrate, and magnesium oxide.
Claim 26
Dependent Claim
58 words
A process as claimed in any one of claims 18 to 23, wherein at least one of components (1) and (2) contain as a coactivator at least one of Ba, Sr,halogens, alkali metals, nitrogen halides, phosphorus halides, arsenic halides, gallium halides, indium halides, aluminum halides, selenium halides and tellurium halides, which is added at the time of firing.
References Cited (Backward Citations)
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