GB528552A - Improvements in luminescent materials and in electric discharge lamps comprising them - Google Patents

Improvements in luminescent materials and in electric discharge lamps comprising them

Info

Publication number
GB528552A
GB528552A GB1385839A GB1385839A GB528552A GB 528552 A GB528552 A GB 528552A GB 1385839 A GB1385839 A GB 1385839A GB 1385839 A GB1385839 A GB 1385839A GB 528552 A GB528552 A GB 528552A
Authority
GB
United Kingdom
Prior art keywords
magnesium
oxide
tungstate
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
GB1385839A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB1385839A priority Critical patent/GB528552A/en
Publication of GB528552A publication Critical patent/GB528552A/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
    • C09K11/67—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing refractory metals
    • C09K11/68—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing refractory metals containing chromium, molybdenum or tungsten

Landscapes

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

Abstract

528,552. Luminescent materials. GENERAL ELECTRIC CO., Ltd., JENKINS, H. G., and McKEAG, A. H. May 9, 1939, No. 13858. [Class 39 (i)] Luminescent material, which may be incorporated in a lamp, consists of or contains a substantial proportion of a luminescent tungstate mixed with a solid oxide of a different base to prevent blackening in manufacture or use. The luminescent tungstates mentioned are those of calcium, magnesium, zinc, cadmium and magnesium-cadmium, which may be suitably activated. The oxides used (a) must be a metallic oxide which is not acidic in the presence of moisture (b) must not be unstable in air, such as the alkaline oxides except lithium oxide and (c) must not be highly coloured. Suitable bases for the oxide mentioned are calcium, strontium, barium, magnesium, beryllium, zinc, cerium, thorium and tin. For the purposes of the invention zinc and magnesium are regarded as the same. The oxide is added in the proportion of 1-20 per cent, and preferably about 5 per cent of the weight of tungstate, and may be incorporated therewith either during the process of making the tungstate, or it may be added to tungstate already made, in which case the mixture is heated below its reaction temperature to cause the intimate association of the ingredients. Specifications 504,354 and 506,165 are referred to. Reference has been directed by the Comptroller to Specification 513,584.
GB1385839A 1939-05-09 1939-05-09 Improvements in luminescent materials and in electric discharge lamps comprising them Expired GB528552A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1385839A GB528552A (en) 1939-05-09 1939-05-09 Improvements in luminescent materials and in electric discharge lamps comprising them

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1385839A GB528552A (en) 1939-05-09 1939-05-09 Improvements in luminescent materials and in electric discharge lamps comprising them

Publications (1)

Publication Number Publication Date
GB528552A true GB528552A (en) 1940-10-31

Family

ID=10030651

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1385839A Expired GB528552A (en) 1939-05-09 1939-05-09 Improvements in luminescent materials and in electric discharge lamps comprising them

Country Status (1)

Country Link
GB (1) GB528552A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617773A (en) * 1948-09-10 1952-11-11 Westinghouse Electric Corp Lead activated calcium tungstate phosphor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617773A (en) * 1948-09-10 1952-11-11 Westinghouse Electric Corp Lead activated calcium tungstate phosphor

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