GB821865A - Improvements in luminescent materials - Google Patents
Improvements in luminescent materialsInfo
- Publication number
- GB821865A GB821865A GB3290356A GB3290356A GB821865A GB 821865 A GB821865 A GB 821865A GB 3290356 A GB3290356 A GB 3290356A GB 3290356 A GB3290356 A GB 3290356A GB 821865 A GB821865 A GB 821865A
- Authority
- GB
- United Kingdom
- Prior art keywords
- manganese
- oxide
- calcium
- cadmium
- calcium oxide
- 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
- C09K11/59—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/20—Luminescent screens characterised by the luminescent material
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
821,865. Luminescent materials. BRITISH THOMSON-HOUSTON CO. Ltd. Oct. 29, 1957 [Oct. 29, 1956], No. 32903/56. Class 39(1). A luminescent material excited by short wave ultra-violet and cathode rays consists of a cadmium-calcium silicate activated by manganese, the molecular proportion of calcium oxide to (cadmium oxide + calcium oxide) in the silicate being not less than 1% and not more than 39À9%, and the content of manganese being from 0À125 to 0À0125 atoms of manganese for each molecule of (calcium oxide + cadmium oxide) in the silicate. The molecular proportions of calcium oxide can be between 5% and 20% for excitation by short wave ultra violet radiation and between 10% and 30% for excitation by cathode rays. The content of manganese is preferably from 0À05 to 0À07 atoms of manganese for each molecule of (calcium oxide + cadmium oxide). The material can be preferred by heating together at a temperature of from 930‹ to 1070‹C. a mixture of cadmium carbonate, calcium carbonate, silica and manganese chloride in the required proportions. In modifications, manganese chloride is replaced by manganese carbonate and/or calcium chloride or fluoride added in substitution for some or all of the calcium carbonate. Preferably only slightly more than 1 mol of silica should be used per mol of (cadmium oxide + calcium oxide). A specific material is preferred from 0À18 mols of cadmium oxide, 0À02 mols of calcium oxide, 0À21 mols of silica and 0À0114 mols of manganese chloride, which are mixed and fired at 950‹C. for 1¢ hours, at 975‹C. for 1¢ hours and at 1000‹C. for 1¢ hours with intermediate grinding between the firings. Specifications 672,518 and 758,940 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3290356A GB821865A (en) | 1956-10-29 | 1956-10-29 | Improvements in luminescent materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3290356A GB821865A (en) | 1956-10-29 | 1956-10-29 | Improvements in luminescent materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB821865A true GB821865A (en) | 1959-10-14 |
Family
ID=10345740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3290356A Expired GB821865A (en) | 1956-10-29 | 1956-10-29 | Improvements in luminescent materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB821865A (en) |
-
1956
- 1956-10-29 GB GB3290356A patent/GB821865A/en not_active Expired
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