GB521796A - Improvements in and relating to luminescent materials for electric discharge lamps - Google Patents
Improvements in and relating to luminescent materials for electric discharge lampsInfo
- Publication number
- GB521796A GB521796A GB31331/38A GB3133138A GB521796A GB 521796 A GB521796 A GB 521796A GB 31331/38 A GB31331/38 A GB 31331/38A GB 3133138 A GB3133138 A GB 3133138A GB 521796 A GB521796 A GB 521796A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parts
- manganese dioxide
- mercury
- beryllium
- 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
- C09K11/59—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)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
521,796. Discharge lamps. BRITISH THOMSON-HOUSTON CO., Ltd. Oct. 29, 1938, No. 31331. Convention date, Oct. 30, 1937. [Class 39 (i)] A luminescent coating for an electric discharge lamp containing mercury vapour comprises a mixture of 60 parts zinc oxide, 40 parts silica, 1.5 to 2.5 parts beryllium oxide, 3 to 5 parts manganese dioxide and ¢ part of lithium chloride by weight which has been fired at 1000‹C. for three hours or at 1100‹C. for half an hour and preferably quenched in water. The fluorescent colour varies from yellow to pink and green with variation of proportions. The preferred proportion of beryllium oxide is 2 parts and of manganese dioxide 4 parts. The zinc oxide,' silica, beryllium oxide and manganese dioxide may be added in the form of zinc nitrate, silicic acid, beryllium hydroxide and manganese nitrate respectively. The material may be mixed with cadmium borate either alone or with magnesium tungstate in order to yield a white luminescent light. a tubular lamp is described having a filling of argon at a pressure of 4 mm. of mercury, and a small quantity of mercury. Its electrodes 11 are thermionic cathodes of the activated type heated to emission by the discharge, and the lamp is preferably operated at a pressure corresponding to a temperature of 40‹C. The luminescent coating 12 is on the inside of the envelope 10. Reference has been directed by the Comptroller to Specifications 478,302 and 492,296, [both in Group XX].
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US521796XA | 1937-10-30 | 1937-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB521796A true GB521796A (en) | 1940-05-31 |
Family
ID=21975959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31331/38A Expired GB521796A (en) | 1937-10-30 | 1938-10-29 | Improvements in and relating to luminescent materials for electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB521796A (en) |
-
1938
- 1938-10-29 GB GB31331/38A patent/GB521796A/en not_active Expired
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