GB1071514A - Preparation of starting materials for phosphate phosphors - Google Patents

Preparation of starting materials for phosphate phosphors

Info

Publication number
GB1071514A
GB1071514A GB2596664A GB2596664A GB1071514A GB 1071514 A GB1071514 A GB 1071514A GB 2596664 A GB2596664 A GB 2596664A GB 2596664 A GB2596664 A GB 2596664A GB 1071514 A GB1071514 A GB 1071514A
Authority
GB
United Kingdom
Prior art keywords
solution
molar
nitrate
calcium
preparation
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
GB2596664A
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB1071514A publication Critical patent/GB1071514A/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
    • C09K11/70—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus
    • C09K11/71—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus also containing alkaline earth metals

Landscapes

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

Abstract

Calcium hydrogen phosphate is precipitated from an acid solution of calcium dihydrogen phosphate in the presence of nitrate ions by heating the solution to a temperature between 60 DEG C. and the boiling point of the solution, and the crystals separated by hot filtration. The nitrate ions may be added as nitric acid or calcium nitrate, in concentrations between 0.004 and 0.2 molar. The concentration of the initial solution calculated as H3PO4 is preferably between 0.4 and 0.7 molar, or between 0.4 and 1.3 molar in the presence of a nucleating agent such as a water-soluble alcohol. 5 to 60% ethanol may be used. The solution may be formed by mixing a soluble calcium salt, particularly the nitrate, with phosphoric acid solution. The product has a narrow particle size range, viz. 9 to 32 microns, suitable for the preparation of phosphors.
GB2596664A 1963-07-11 1964-06-23 Preparation of starting materials for phosphate phosphors Expired GB1071514A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29439563A 1963-07-11 1963-07-11

Publications (1)

Publication Number Publication Date
GB1071514A true GB1071514A (en) 1967-06-07

Family

ID=23133229

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2596664A Expired GB1071514A (en) 1963-07-11 1964-06-23 Preparation of starting materials for phosphate phosphors

Country Status (1)

Country Link
GB (1) GB1071514A (en)

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