GB998587A - Improvements in or relating to luminescent materials - Google Patents
Improvements in or relating to luminescent materialsInfo
- Publication number
- GB998587A GB998587A GB25413/61A GB2541361A GB998587A GB 998587 A GB998587 A GB 998587A GB 25413/61 A GB25413/61 A GB 25413/61A GB 2541361 A GB2541361 A GB 2541361A GB 998587 A GB998587 A GB 998587A
- Authority
- GB
- United Kingdom
- Prior art keywords
- activator
- halogen
- gallium
- bromine
- silver
- 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
- C09K11/0805—Chalcogenides
- C09K11/0811—Chalcogenides with zinc or cadmium
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
A method of preparing a phosphor comprises (a) firing a mixture of starting materials comprising zinc and/or cadmium sulphide, selenide or telluride and a compound providing copper, silver or gold as main activator, in the presence of a halogen or a gaseous or wholly volatilizable halogen compound so that halogen is incorporated as a first co-activator, (b) moistening the fired product with a solution of indium or gallium to provide a second co-activator, and (c) refiring in an oxygen-free atmosphere. The halogen may be bromine, alone or as ammonium bromide, and the atmosphere may be nitrogen. The percentage of cadmium may be 25% or more and the molar ratio of combined co-activators to activator should be greater than unity. The preparation of zinc-cadmium sulphide activated with silver, bromine and gallium is described in detail, both firings being at 975 DEG C. The product is compared with similar ones in which either the bromine or the gallium is omitted, and the superiority in regard to colour shift is shown.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB25413/61A GB998587A (en) | 1961-07-13 | 1961-07-13 | Improvements in or relating to luminescent materials |
| JP2906662A JPS3918275B1 (en) | 1961-07-13 | 1962-07-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB25413/61A GB998587A (en) | 1961-07-13 | 1961-07-13 | Improvements in or relating to luminescent materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB998587A true GB998587A (en) | 1965-07-14 |
Family
ID=10227274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25413/61A Expired GB998587A (en) | 1961-07-13 | 1961-07-13 | Improvements in or relating to luminescent materials |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS3918275B1 (en) |
| GB (1) | GB998587A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507805A (en) * | 1967-04-18 | 1970-04-21 | Westinghouse Electric Corp | Long-afterglow phosphor |
-
1961
- 1961-07-13 GB GB25413/61A patent/GB998587A/en not_active Expired
-
1962
- 1962-07-13 JP JP2906662A patent/JPS3918275B1/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507805A (en) * | 1967-04-18 | 1970-04-21 | Westinghouse Electric Corp | Long-afterglow phosphor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS3918275B1 (en) | 1964-08-29 |
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