GB503769A - Improvements relating to the manufacture of luminescent powders - Google Patents

Improvements relating to the manufacture of luminescent powders

Info

Publication number
GB503769A
GB503769A GB2749437A GB2749437A GB503769A GB 503769 A GB503769 A GB 503769A GB 2749437 A GB2749437 A GB 2749437A GB 2749437 A GB2749437 A GB 2749437A GB 503769 A GB503769 A GB 503769A
Authority
GB
United Kingdom
Prior art keywords
calcium
sulphide
sulphate
luminescent
oxidation
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
Application number
GB2749437A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GWYNN OWEN STEPHENS
WILLIAM GEORGE CREASY
Siemens Electric Lamps and Supplies Ltd
Original Assignee
GWYNN OWEN STEPHENS
WILLIAM GEORGE CREASY
Siemens Electric Lamps and Supplies Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GWYNN OWEN STEPHENS, WILLIAM GEORGE CREASY, Siemens Electric Lamps and Supplies Ltd filed Critical GWYNN OWEN STEPHENS
Priority to GB2749437A priority Critical patent/GB503769A/en
Publication of GB503769A publication Critical patent/GB503769A/en
Expired legal-status Critical Current

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
    • C09K11/56—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing sulfur
    • C09K11/562—Chalcogenides
    • C09K11/567—Chalcogenides with alkaline earth metals
    • 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
    • C09K11/56—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing sulfur

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)

Abstract

503,769. Luminescent materials. SIEMENS ELECTRIC LAMPS & SUPPLIES, Ltd., CREASY, W. G., and STEPHENS, G. O. Oct. 9, 1937, No. 27494. [Class 39 (i)] In preparing a luminescent powder, calcium sulphide and/or its oxidation products is, or are, subjected to a succession of alternate oxidation and reduction processes. A solid solution of calcium sulphide and calcium sulphate is obtained by igniting a mixture of calcium oxide, sulphur, an activator such as a copper salt, an alkali sulphite, a carbohydrate such as cane sugar, and, if necessary, calcium sulphate or by heating the same mixture to 900‹ C. in an atmosphere of hydrogen. The oxidation of the solid solution so formed is achieved by heating it in an oxidizing atmosphere or with an oxidizing compound such as potassium nitrate. The flux may be potassium metabisulphite, sodium sulphite or sodium thiosulphate and the activator salt, copper sulphate. Zinc sulphide and magnesium chloride may be added to the powder to increase the luminescent efficiency. The final mass is heated in air at 600‹ C. although the actual process at which the reactions are stopped is such that the quantity of calcium sulphide shall not be greater than the quantity of calcium sulphate. The final product is powdered and either blown onto an adhesive on the surface of the screen, or mixed with a liquid adhesive and applied to the screen.
GB2749437A 1937-10-09 1937-10-09 Improvements relating to the manufacture of luminescent powders Expired GB503769A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2749437A GB503769A (en) 1937-10-09 1937-10-09 Improvements relating to the manufacture of luminescent powders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2749437A GB503769A (en) 1937-10-09 1937-10-09 Improvements relating to the manufacture of luminescent powders

Publications (1)

Publication Number Publication Date
GB503769A true GB503769A (en) 1939-04-11

Family

ID=10260495

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2749437A Expired GB503769A (en) 1937-10-09 1937-10-09 Improvements relating to the manufacture of luminescent powders

Country Status (1)

Country Link
GB (1) GB503769A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4348299A (en) 1980-08-27 1982-09-07 Rca Corporation Method for preparing inorganic sulfides
US8193091B2 (en) * 2002-01-09 2012-06-05 Panasonic Corporation Resin encapsulated semiconductor device and method for manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4348299A (en) 1980-08-27 1982-09-07 Rca Corporation Method for preparing inorganic sulfides
US8193091B2 (en) * 2002-01-09 2012-06-05 Panasonic Corporation Resin encapsulated semiconductor device and method for manufacturing the same

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