GB691127A - Improvements in and relating to luminescent calcium halophosphate phosphors - Google Patents

Improvements in and relating to luminescent calcium halophosphate phosphors

Info

Publication number
GB691127A
GB691127A GB22551/50A GB2255150A GB691127A GB 691127 A GB691127 A GB 691127A GB 22551/50 A GB22551/50 A GB 22551/50A GB 2255150 A GB2255150 A GB 2255150A GB 691127 A GB691127 A GB 691127A
Authority
GB
United Kingdom
Prior art keywords
calcium
firing
oxide
chloride
luminescent
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
GB22551/50A
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.)
Thorn Electrical Industries Ltd
Original Assignee
Thorn Electrical Industries 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 Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Publication of GB691127A publication Critical patent/GB691127A/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
    • C09K11/0855—Phosphates
    • C09K11/0861—Phosphates with alkaline earth metals
    • C09K11/0866—Phosphates with alkaline earth metals with halogens

Landscapes

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

Abstract

691,127. Luminescent materials. THOR N ELECTRICAL INDUSTRIES, Ltd. Sept. 13, 1950 [Sept. 13, 1949], No. 22551/50. Class 39(i). A method of preparing a luminescent calcium halophosphate phosphor containing combined chlorine as chloride, comprises firing a mixture of ingredients in which substantially all chloride present is in the form of ammonium chloride. In an example described ammonium chloride, calcium carbonate, secondary calcium phosphate, antimony oxide or an antimony salt which can be reduced to the oxide on firing and if desired a manganous salt (manganous carbonate referred to) which can be reduced to the oxide on firing, and calcium fluoride are intimately mixed and fired. Proportions of constituents are given. The gram atom ratio of calcium plus manganese to phosphorus should be about 4.85 to 3 for maximum brightness. The mixture is fired, preferably in covered crucibles, at 1090‹C for 6 hours and the resulting mass is powdered and, if necessary, milled. The secondary calcium phosphate is prepared as described in Specification 684,025. The emission colour is approximately 3500‹K white.
GB22551/50A 1949-09-13 1950-09-13 Improvements in and relating to luminescent calcium halophosphate phosphors Expired GB691127A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US691127XA 1949-09-13 1949-09-13

Publications (1)

Publication Number Publication Date
GB691127A true GB691127A (en) 1953-05-06

Family

ID=22086829

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22551/50A Expired GB691127A (en) 1949-09-13 1950-09-13 Improvements in and relating to luminescent calcium halophosphate phosphors

Country Status (1)

Country Link
GB (1) GB691127A (en)

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