GB742355A - Improvements relating to electro-luminescent materials - Google Patents
Improvements relating to electro-luminescent materialsInfo
- Publication number
- GB742355A GB742355A GB36354/53A GB3635453A GB742355A GB 742355 A GB742355 A GB 742355A GB 36354/53 A GB36354/53 A GB 36354/53A GB 3635453 A GB3635453 A GB 3635453A GB 742355 A GB742355 A GB 742355A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sulphide
- per cent
- copper
- oxygen
- aluminium
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
- H05B33/145—Arrangements of the electroluminescent material
Landscapes
- Luminescent Compositions (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
742,355. Electroluminescent materials. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 31, 1953 [Dec. 31, 1952], No. 36354/53. Drawings to Specification. Class 39 (1). Electroluminescent copper activated zinc aluminium sulphide is prepared by firing in an atmosphere of hydrogen sulphide containing from 0.01-20 per cent of an oxygen-containing gas, the copper content of the mixture before firing being 0.1-0.4 per cent by weight of zinc sulphide and the aluminium 25-250 mol. per cent of the copper. The oxygen-containing gas may be water vapour, air, CO 2 or SO 2 . The Cu and A1 are added as nitrates, sulphates, chlorides &c. The fired powder may be washed with NaCN (5 per cent) to remove excess copper sulphide. In preparing the material, mixtures of ZnS and ZnO may be used in place of pure ZnS or even ZnO converted into the sulphide by heating in pure H 2 S. Air or CO 2 may be added to the stream of H 2 S for the phosphor firing atmosphere by slow displacement in a flask admitting water and subsequently freezing out the water vapour at -57‹ C. The Specification includes a number of examples in which the presence of large quantities of oxygen give blue electroluminescence, whilst small quantities give green. The phosphors are convertible by reheating in the appropriate atmosphere. The presence of aluminium gives a stable green electroluminescence unaffected by frequency shift. Specification 734,652 is referred to,
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US742355XA | 1952-12-31 | 1952-12-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB742355A true GB742355A (en) | 1955-12-21 |
Family
ID=22118482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36354/53A Expired GB742355A (en) | 1952-12-31 | 1953-12-31 | Improvements relating to electro-luminescent materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB742355A (en) |
-
1953
- 1953-12-31 GB GB36354/53A patent/GB742355A/en not_active Expired
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