GB568790A - Improvements relating to the production of luminescent materials - Google Patents
Improvements relating to the production of luminescent materialsInfo
- Publication number
- GB568790A GB568790A GB326543A GB326543A GB568790A GB 568790 A GB568790 A GB 568790A GB 326543 A GB326543 A GB 326543A GB 326543 A GB326543 A GB 326543A GB 568790 A GB568790 A GB 568790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- added
- oxide
- beryllium
- gram
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
568,790. Luminescent materials. TYRER & CO., Ltd., T., PEARCE SIGNS, Ltd., and SNOOK, H. H. FÞb. 27, 1943, No. 3265. [Class 39 (i)] A fluorescent material comprises zinc metasilicate activated by manganese dioxide and by an amount of beryllium oxide which does not exceed 1 per cent by weight of the final product. One gram-molecule of pure zinc oxide is mixed with 1-1.25 gram-molecule of pure silica obtained by treating sodium silicate solution with strong sulphuric acid; to this is added 2-4 per cent, preferably 3 per cent, of manganese dioxide and 0.9-1 per cent, preferably 0.95 per cent, of beryllium oxide. The mixture is heated at 1050-1200‹ C., preferably 1175‹ C., for four hours, ground, and then reheated to 1200‹ C. Up to 10 per cent of silica may be added before the second heating. The sintered mass is reduced to about 50 Á particles, by a process of grinding, sieving and elutriation. At the preferred percentage of beryllium a bright yellow fluorescence is obtained when the material is excited by a mercury vapour or rare gas discharge or by cathode rays. For cathode-ray tubes in which it is desired to reduce afterglow, from 10 to 100 parts per million of iron or nickel oxide may be added. The material may be mixed with other fluorescent material and applied to discharge tubes with coloured envelopes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB326543A GB568790A (en) | 1943-02-27 | 1943-02-27 | Improvements relating to the production of luminescent materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB326543A GB568790A (en) | 1943-02-27 | 1943-02-27 | Improvements relating to the production of luminescent materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB568790A true GB568790A (en) | 1945-04-20 |
Family
ID=9755067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB326543A Expired GB568790A (en) | 1943-02-27 | 1943-02-27 | Improvements relating to the production of luminescent materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB568790A (en) |
-
1943
- 1943-02-27 GB GB326543A patent/GB568790A/en not_active Expired
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