GB582122A - Improvements in luminescent materials - Google Patents
Improvements in luminescent materialsInfo
- Publication number
- GB582122A GB582122A GB476441A GB476441A GB582122A GB 582122 A GB582122 A GB 582122A GB 476441 A GB476441 A GB 476441A GB 476441 A GB476441 A GB 476441A GB 582122 A GB582122 A GB 582122A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosphate
- dysprosium
- carbonate
- calcium
- dried
- 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
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7709—Phosphates
- C09K11/771—Phosphates with 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
582,122. Luminescent materials. GENERAL ELECTRIC CO., Ltd., JENKINS, H. G., McKEAG, A. H., and RANBY, P. W. April 10, 1941, No. 4764. [Class 39 (i)] A luminescent material with substantial after-glow when excited by cathode or X-rays consists of an alkaline earth phosphate activated with dysprosium. In one method of manufacture, calcium carbonate is formed from determined quantities of calcium chloride and ammonium carbonate, the chloride having been purified by ammonium sulphide; 40 grams of the dried carbonate is mixed with 52 grams diammonium hydrogen phosphate and 50 ml. solution of dysprosium sulphate with 0.1 per cent of dysprosium. The mixture is dried, ground, fired at 1050-1100‹ C. in air and then lightly ground. In another method, calcium carbonate is dissolved in dilute hydrochloric acid and the phosphate formed from this solution. In a third method, carbonate is formed as in the first method and dilute phosphoric acid is used therewith to form the phosphate. Barium or strontium may be used instead of or mixed with the calcium; the phosphate radical is preferred as the meta- or ortho-phosphate. Some terbium may be added to the dysprosium. Specification 490,663 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB476441A GB582122A (en) | 1941-04-10 | 1941-04-10 | Improvements in luminescent materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB476441A GB582122A (en) | 1941-04-10 | 1941-04-10 | Improvements in luminescent materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB582122A true GB582122A (en) | 1946-11-06 |
Family
ID=9783345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB476441A Expired GB582122A (en) | 1941-04-10 | 1941-04-10 | Improvements in luminescent materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB582122A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0102238A1 (en) * | 1982-08-25 | 1984-03-07 | Konica Corporation | Method for converting radiographic images |
| US4772417A (en) * | 1984-12-21 | 1988-09-20 | Gte Laboratories Incorporated | Process for preparing high-brightness yellow-emitting triboluminescent phosphors |
-
1941
- 1941-04-10 GB GB476441A patent/GB582122A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0102238A1 (en) * | 1982-08-25 | 1984-03-07 | Konica Corporation | Method for converting radiographic images |
| US4772417A (en) * | 1984-12-21 | 1988-09-20 | Gte Laboratories Incorporated | Process for preparing high-brightness yellow-emitting triboluminescent phosphors |
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