GB759131A - Improvements in or relating to luminescent materials and the manufacture thereof - Google Patents

Improvements in or relating to luminescent materials and the manufacture thereof

Info

Publication number
GB759131A
GB759131A GB327/52A GB32752A GB759131A GB 759131 A GB759131 A GB 759131A GB 327/52 A GB327/52 A GB 327/52A GB 32752 A GB32752 A GB 32752A GB 759131 A GB759131 A GB 759131A
Authority
GB
United Kingdom
Prior art keywords
phosphate
manganese
composition
luminescent
zinc
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
GB327/52A
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.)
Westinghouse Electric International Co
Original Assignee
Westinghouse Electric International Co
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 Westinghouse Electric International Co filed Critical Westinghouse Electric International Co
Publication of GB759131A publication Critical patent/GB759131A/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
    • C09K11/72—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus also containing halogen, e.g. halophosphates
    • C09K11/73—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus also containing halogen, e.g. halophosphates 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

759,131. Luminescent materials; discharge lamps. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. Jan. 4, 1952 [Feb. 2, 1951], No. 327/52. Drawings to Specification. Class 39 (1). A luminescent composition comprises the fired reaction product of a cadmium phosphate, a halide or halides formed by one of the group consisting of chlorine and fluorine and at least one of group consisting of zinc, strontium, barium, and magnesium in the presence of zinc, and manganese as activator and having the formula 3Cd 3 (PO 4 )u.vMgL 2 .wZnL 2 .xSrL 2 .yBaL 2 : zMn, where L stands for a halogen of the group chlorine and fluorine, and where u lies between and including 2 and 2.5 and v, w, x, y and z are subject to specified limitations. The cadmium phosphate part of the composition may be produced from cadmium oxide, hydroxide, nitrate, carbonate, or phosphate and mono- or di-ammonium acid phosphate, phosphoric acid or phosphorous pentoxide. The manganese activator can be produced from hydrated manganese chloride, manganese carbonate, oxide, sulphate, nitrate or phosphate. Ammonium chloride may be present in the starting materials. The starting materials are mixed, ground for at least one hour and fired in a covered tray for 1.5 to 4 hours at a temperature of 700-980‹ C. Several specific compositions are described. The luminescent composition can be blended in specified proportions with zinc silicate and magnesium tungstate to produce white luminescence. The composition can be applied to the interior surface of a lamp envelope which is then baked in a lehr at a temperature of from 593‹ to 621‹ C. In tests on the luminescent composition, materials having the formulµ 3Ca 3 (PO 4 ) u .CaFCl : Sb : Mn and ZnBeSiO 4 : Mn are used for comparison.
GB327/52A 1951-02-02 1952-01-04 Improvements in or relating to luminescent materials and the manufacture thereof Expired GB759131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US759131XA 1951-02-02 1951-02-02

Publications (1)

Publication Number Publication Date
GB759131A true GB759131A (en) 1956-10-17

Family

ID=22128718

Family Applications (1)

Application Number Title Priority Date Filing Date
GB327/52A Expired GB759131A (en) 1951-02-02 1952-01-04 Improvements in or relating to luminescent materials and the manufacture thereof

Country Status (1)

Country Link
GB (1) GB759131A (en)

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