GB506165A - Improvements in sources of light comprising an electric discharge device and luminescent material adapted to be excited by the discharge therein - Google Patents
Improvements in sources of light comprising an electric discharge device and luminescent material adapted to be excited by the discharge thereinInfo
- Publication number
- GB506165A GB506165A GB2862337A GB2862337A GB506165A GB 506165 A GB506165 A GB 506165A GB 2862337 A GB2862337 A GB 2862337A GB 2862337 A GB2862337 A GB 2862337A GB 506165 A GB506165 A GB 506165A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnesium
- mixed
- tungstate
- hour
- zinc 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
- C09K11/67—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing refractory metals
- C09K11/68—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing refractory metals containing chromium, molybdenum or tungsten
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
- Gas-Filled Discharge Tubes (AREA)
Abstract
506,165. Luminescent materials. GENERAL ELECTRIC CO., Ltd., McKEAG, A. H., and RANDALL, J. T. Oct. 20, 1937, No. 28623. [Class 39 (i)] An electrical gas discharge device contains luminescent magnesium tungstate and/or zinc tungstate mixed with free magnesium and/or zinc oxide to prevent discolouration and loss of efficiency of the tungstates. In one method of preparation magnesium or zinc oxide is mixed with tungstic oxide in the proportion of 11 molecules to 10 molecules and the mixture heated in an oxidizing atmosphere at about 1150‹ C. for 1 hour and then ground and sieved. In another method 1 mol. of material produced by the first method is mixed when dry with 0À9 mols. of magnesium oxide and the mixture heated to 400‹ C. for half an hour. In general the proportion of free magnesium and /or zinc oxide is such that if a moles. of W03 are present, there are present ( 1 +x)a mols. of (MgO+ZnO), where x is not less than 00À5. According to the Provisional Specification, material produced from a mixture in the ratio of 1MgO (or ZnO) to 1WO3 is mixed with MgO (orZnO) amounting to about 10 per cent of that already present and heated to about 1000‹ C. in an oxidizing or neutral gas for 1 hour or more. The Provisional Specification also refers to Specification 504,354 and to the use of magnesium-cadmium tungstate and calcium tungstate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2862337A GB506165A (en) | 1937-10-20 | 1937-10-20 | Improvements in sources of light comprising an electric discharge device and luminescent material adapted to be excited by the discharge therein |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2862337A GB506165A (en) | 1937-10-20 | 1937-10-20 | Improvements in sources of light comprising an electric discharge device and luminescent material adapted to be excited by the discharge therein |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB506165A true GB506165A (en) | 1939-05-22 |
Family
ID=10278518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2862337A Expired GB506165A (en) | 1937-10-20 | 1937-10-20 | Improvements in sources of light comprising an electric discharge device and luminescent material adapted to be excited by the discharge therein |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB506165A (en) |
-
1937
- 1937-10-20 GB GB2862337A patent/GB506165A/en not_active Expired
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