GB641212A - Improvements in and relating to fluorescent material - Google Patents
Improvements in and relating to fluorescent materialInfo
- Publication number
- GB641212A GB641212A GB160345A GB160345A GB641212A GB 641212 A GB641212 A GB 641212A GB 160345 A GB160345 A GB 160345A GB 160345 A GB160345 A GB 160345A GB 641212 A GB641212 A GB 641212A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosphor
- radiation
- excited
- mesh screen
- pass
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
641,212. Luminescent materials. BRITISH THOMSON-HOUSTON CO., Ltd. (General Electric Co.). Jan. 19, 1945, No. 1603. [Class 39 (i)] A phosphor comprises a matrix which is a zirconate of strontium, barium or cadmium activated with 1 per cent or less of silver, copper or praseodymium. A volatile flux such as aluminium fluoride nr a non-volatile flux such as lead monoxide can be used in the preparation of the phosphor. According to one example a phosphor is prepared by dry-mixing zirconium dioxide, strontium sulphate and lead monoxide, adding bismuth nitrate in aqueous solution to form a slurry, mixing until uniform, heating to evaporate off the water, grinding the dry batch so obtained to pass a 100-mesh screen, firing at 1200-1300‹ C. until the evolution of sulphurous gas ceases, quenching suddenly in water, and finally drying and regrinding the batch to pass a 100-mesh screen. The phosphor is excited most powerfully by ultraviolet radiation of about 3000 Š to 3800Š, especially 3650 Š, although also excited in some degree by the 2537 Š resonance radiation of mercury. A layer of the phosphor may be coated on the inner surface of the enclosing jacket of a high-pressure mercury vapour lamp or on a sign or dial exposed to the radiation from such a lamp, especially for use in darkness. Specification 460,210, [Group XXIII], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB160345A GB641212A (en) | 1945-01-19 | 1945-01-19 | Improvements in and relating to fluorescent material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB160345A GB641212A (en) | 1945-01-19 | 1945-01-19 | Improvements in and relating to fluorescent material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB641212A true GB641212A (en) | 1950-08-09 |
Family
ID=9724796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB160345A Expired GB641212A (en) | 1945-01-19 | 1945-01-19 | Improvements in and relating to fluorescent material |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB641212A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4963787A (en) * | 1989-02-15 | 1990-10-16 | U.S. Philips Corporation | Luminescent alkaline earth metal orthosilicate, luminescent screen provided with such a silicate and low-pressure mercury vapor discharge lamp provided with such a screen |
| US5124072A (en) * | 1991-12-02 | 1992-06-23 | General Electric Company | Alkaline earth hafnate phosphor with cerium luminescence |
-
1945
- 1945-01-19 GB GB160345A patent/GB641212A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4963787A (en) * | 1989-02-15 | 1990-10-16 | U.S. Philips Corporation | Luminescent alkaline earth metal orthosilicate, luminescent screen provided with such a silicate and low-pressure mercury vapor discharge lamp provided with such a screen |
| US5124072A (en) * | 1991-12-02 | 1992-06-23 | General Electric Company | Alkaline earth hafnate phosphor with cerium luminescence |
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