GB707110A - Improvements in or relating to luminescent substances - Google Patents

Improvements in or relating to luminescent substances

Info

Publication number
GB707110A
GB707110A GB29367/51A GB2936751A GB707110A GB 707110 A GB707110 A GB 707110A GB 29367/51 A GB29367/51 A GB 29367/51A GB 2936751 A GB2936751 A GB 2936751A GB 707110 A GB707110 A GB 707110A
Authority
GB
United Kingdom
Prior art keywords
aluminium
atoms
thallium
dec
ratio
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
GB29367/51A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB707110A publication Critical patent/GB707110A/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)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Luminescent Compositions (AREA)

Abstract

707,110. Luminescent materials. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Dec. 14, 1951 [Dec. 19, 1950], No. 29367/51. Drawings to Specification. Class 39(1) Luminescent material, for use with an electric gas discharge tube for the production of ultraviolet rays, comprising calcium orthophosphate activated by thallium, is characterised in that the crystal lattice comprises also aluminium, the ratio between the sum of the number of atoms of the elements calcium, aluminium and thallium and the number of atoms of phosphorus being between 3:2 and 2.4:2, preferably 2.9:2, and the ratio between the number of atoms of aluminium and thallium being between 0.5: 1 and 2: 1, preferably 1 : 1. There may be 4 atoms each of aluminium and thallium per 100 molecules of calcium orthophosphate. The luminescent material can be positioned inside the discharge tube or outside it, e.g. on a reflector outside the tube. The maximum emission of the material lies between 3050 and 3100 Š. Methods of preparation of the material are described. Specifications 512,154 and 577,693 are referred to.
GB29367/51A 1950-12-19 1951-12-14 Improvements in or relating to luminescent substances Expired GB707110A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL707110X 1950-12-19

Publications (1)

Publication Number Publication Date
GB707110A true GB707110A (en) 1954-04-14

Family

ID=19812098

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29367/51A Expired GB707110A (en) 1950-12-19 1951-12-14 Improvements in or relating to luminescent substances

Country Status (1)

Country Link
GB (1) GB707110A (en)

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