GB820943A - Improvements in or relating to methods of producing luminescent materials - Google Patents
Improvements in or relating to methods of producing luminescent materialsInfo
- Publication number
- GB820943A GB820943A GB36455/55A GB3645555A GB820943A GB 820943 A GB820943 A GB 820943A GB 36455/55 A GB36455/55 A GB 36455/55A GB 3645555 A GB3645555 A GB 3645555A GB 820943 A GB820943 A GB 820943A
- Authority
- GB
- United Kingdom
- Prior art keywords
- radiation
- lead
- mixture
- compounds
- strontium
- 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
Abstract
820,943. Luminescent materials ; discharge lamps. PHILIPS ELECTRICAL INDUSTRIES Ltd. Dec. 20, 1955 [Dec. 23, 1954], No. 36455/55. Drawings to Specification. Class 39(1). A method of producing a luminescent material including a lead-activated strontium silicate, particularly for exhibiting a maximum emission of radiation between 3200Š, and 3700Š under excitation by radiation of 2537Š, when used in or on a low pressure mercury vapour discharge tube or on a reflector outside the tube, is characterized by preparing a mixture of compounds of strontium, silicon, lead and either or both of the metals zinc and magnesium, and, if desired, barium, and/or calcium, and heating the mixture in an oxidising atmosphere to a temperature between 900‹C. and 1200‹C. for from 1 to 5 hours, the amounts of the compounds being such that the proportions of the said elements in the mixture satisfy specified atomic ratio conditions. At least one of the compounds employed can be an oxide, nitrate or carbonate. A fusing salt can be used consisting of the fluoride of at least one of the elements, strontium, barium and calcium, and/or that of lead. The luminescent material is stated to contain a substance with the formula M2NSi2O7: Pb, where M designates atoms of Sr or Sr and Ca and/or Ba and N designates atoms of Mg and/or Zn. The X-ray diffraction diagram and the intensity of radiation-wave length curves for the materials are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL820943X | 1954-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB820943A true GB820943A (en) | 1959-09-30 |
Family
ID=19840856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36455/55A Expired GB820943A (en) | 1954-12-23 | 1955-12-20 | Improvements in or relating to methods of producing luminescent materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB820943A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3984346A (en) * | 1973-09-27 | 1976-10-05 | Corning Glass Works | Method of forming a high efficiency phosphor for photochromic glass information display systems |
-
1955
- 1955-12-20 GB GB36455/55A patent/GB820943A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3984346A (en) * | 1973-09-27 | 1976-10-05 | Corning Glass Works | Method of forming a high efficiency phosphor for photochromic glass information display systems |
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