GB758940A - Improvements relating to luminescent materials or phosphors - Google Patents
Improvements relating to luminescent materials or phosphorsInfo
- Publication number
- GB758940A GB758940A GB3381653A GB3381653A GB758940A GB 758940 A GB758940 A GB 758940A GB 3381653 A GB3381653 A GB 3381653A GB 3381653 A GB3381653 A GB 3381653A GB 758940 A GB758940 A GB 758940A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- cadmium
- manganese
- lead
- calcium
- 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
758,940. Luminescent materials. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 6, 1954 [Dec. 4, 1953], No. 33816/53. Class 39 (1). Luminescent material, particularly for a lowpressure mercury vapour discharge lamp, comprises a calcium-cadmium silicate activated with lead and manganese and containing an atomic proportion of cadmium to (calcium and cadmium) of not more than 60 per cent, preferably between 1 and 50 per cent. The initial molecular proportions of the activators can be between 3 and 15 per cent of lead and between 1 and 15 per cent of manganese by weight, preferably 7 to 7¢ mol. per cent of lead and 3 to 15 mol. per cent of manganese. A material containing 20 per cent cadmium is prepared by firing for an hour or more at 1100-1260‹ C. a mixture of CaCO 3 , MnCO 3 , PbO, SiO 2 , CaF 2 and CdCO 3 or Cd(C 2 H 3 O 2 ) 2 .3H 2 O, cooling, grinding, adding CaCl 2 and re-firing. The calciumcadmium silicate is stated to be in the # form. The luminescent material can be mixed with calcium halo-phosphate, magnesium tungstate or zinc silicate to supply red light deficiency. According to the Provisional Specification the atomic ratio of cadmium to calcium can be between 5 : 95 and 50: 50 and the proportion of manganese may be 1-40 per cent of lead, preferably 10 per cent. Specification 672,518 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3381653A GB758940A (en) | 1953-12-04 | 1953-12-04 | Improvements relating to luminescent materials or phosphors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3381653A GB758940A (en) | 1953-12-04 | 1953-12-04 | Improvements relating to luminescent materials or phosphors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB758940A true GB758940A (en) | 1956-10-10 |
Family
ID=10357829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3381653A Expired GB758940A (en) | 1953-12-04 | 1953-12-04 | Improvements relating to luminescent materials or phosphors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB758940A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3544480A (en) * | 1968-01-11 | 1970-12-01 | Corning Glass Works | Cadmium silicate crystals |
-
1953
- 1953-12-04 GB GB3381653A patent/GB758940A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3544480A (en) * | 1968-01-11 | 1970-12-01 | Corning Glass Works | Cadmium silicate crystals |
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