GB745560A - Improvements relating to fluorescent materials - Google Patents
Improvements relating to fluorescent materialsInfo
- Publication number
- GB745560A GB745560A GB1834152A GB1834152A GB745560A GB 745560 A GB745560 A GB 745560A GB 1834152 A GB1834152 A GB 1834152A GB 1834152 A GB1834152 A GB 1834152A GB 745560 A GB745560 A GB 745560A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calcium
- silicon
- firing
- july
- ammonium chloride
- 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
- C09K11/66—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing germanium, tin or lead
- C09K11/666—Aluminates; Silicates
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
745,560. Luminescent materials. SIEMENS ELECTRIC LAMPS & SUPPLIES, Ltd. July 10, 1953 [July 21, 1952], No. 18341/52. Class 39 (1). Method of preparing lead and manganese activated calcium silicate for excitation by radiation of 2537 A in a low pressure mercury vapour discharge lamp comprises mixing compounds of calcium and silicon, e.g. calcium carbonate and silicon dioxide, a compound of manganese, e.g. the carbonate, and the fluorides of lead and of an alkaline earth metal, e.g. calcium, and firing the mixture in steam at about 1150‹ C. for about 1 hour, allowing the material' to cool, adding ammonium chloride and re-mixing and firing at the same temperature for another hour. The proportion of silicon di-oxide can be slightly in excess of that required to produce calcium meta-silicate and the amount of ammonium chloride can be between 1 and 10 per cent by weight of the material to which it is added. Specification 701,754 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1834152A GB745560A (en) | 1952-07-21 | 1952-07-21 | Improvements relating to fluorescent materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1834152A GB745560A (en) | 1952-07-21 | 1952-07-21 | Improvements relating to fluorescent materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB745560A true GB745560A (en) | 1956-02-29 |
Family
ID=10110803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1834152A Expired GB745560A (en) | 1952-07-21 | 1952-07-21 | Improvements relating to fluorescent materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB745560A (en) |
-
1952
- 1952-07-21 GB GB1834152A patent/GB745560A/en not_active Expired
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