GB714791A - Improvements in and relating to luminescent materials - Google Patents
Improvements in and relating to luminescent materialsInfo
- Publication number
- GB714791A GB714791A GB5892/52A GB589252A GB714791A GB 714791 A GB714791 A GB 714791A GB 5892/52 A GB5892/52 A GB 5892/52A GB 589252 A GB589252 A GB 589252A GB 714791 A GB714791 A GB 714791A
- Authority
- GB
- United Kingdom
- Prior art keywords
- germanium
- gram
- inclusive
- march
- atmosphere
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/70—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus
- C09K11/71—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus also containing alkaline earth metals
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
714,791. Luminescent materials. SYLVANIA ELECTRIC PRODUCTS, Inc. March 6, 1952 [March 17, 1951], No. 5892/52. Class 39(1) A luminescent material, responsive to U.V. radiation of 2540A, consists of an alkaline-earth metal, preferably calcium, phosphate activated with germanium, at least part of the germanium being in the divalent state and the ratio of gramatoms of alkaline earth metal to gram-moles of phosphorous pentoxide being less than 3:1 and greater than 2:1, preferably between 2.96:1 and 2.7:1 inclusive. The germanium content is preferably between 0.002 and 0.20 inclusive gram-atoms per gram-mole of phosphorous pentoxide. The starting materials are fired in air at a temperature of about 2000‹F and are refired at a temperature of between 1700‹ and 2200‹F. preferably 2000‹F, in an atmosphere, preferably a mixture of hydrogen and nitrogen, which reduces at least part of the germanium to the divalent state. The hydrogen content of the refiring atmosphere is between 0.2 and 20 per cent, preferably between 0.5 and 5 per cent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US714791XA | 1951-03-17 | 1951-03-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB714791A true GB714791A (en) | 1954-09-01 |
Family
ID=22101584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5892/52A Expired GB714791A (en) | 1951-03-17 | 1952-03-06 | Improvements in and relating to luminescent materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB714791A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2941509A (en) * | 1957-10-28 | 1960-06-21 | Anderton Walter Carlos | Mechanical pencil with eraser |
-
1952
- 1952-03-06 GB GB5892/52A patent/GB714791A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2941509A (en) * | 1957-10-28 | 1960-06-21 | Anderton Walter Carlos | Mechanical pencil with eraser |
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