GB936251A - Method of and apparatus for making phosphors - Google Patents

Method of and apparatus for making phosphors

Info

Publication number
GB936251A
GB936251A GB4194259A GB4194259A GB936251A GB 936251 A GB936251 A GB 936251A GB 4194259 A GB4194259 A GB 4194259A GB 4194259 A GB4194259 A GB 4194259A GB 936251 A GB936251 A GB 936251A
Authority
GB
United Kingdom
Prior art keywords
materials
firing
heating
phosphor
antimony
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
GB4194259A
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
Priority claimed from US779370A external-priority patent/US3093594A/en
Priority claimed from US779399A external-priority patent/US3002933A/en
Application filed by Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB936251A publication Critical patent/GB936251A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/74Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing arsenic, antimony or bismuth
    • C09K11/75Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing arsenic, antimony or bismuth containing antimony
    • C09K11/76Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing arsenic, antimony or bismuth containing antimony also containing phosphorus and halogen, e.g. halophosphates

Landscapes

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

Abstract

936,251. Luminescent materials. SYLVANIA ELECTRIC PRODUCTS Inc. Dec. 9, 1959 [Dec. 10, 1958 (2)], No. 41942/59. Drawings to Specification. Class 39 (1). Method of making a phosphor, e.g. a calcium halo-phosphate phosphor activated by trivalent antimony and manganese, comprises preheating the starting materials at a temperature between 1000 ‹ and 1600 ‹ F. sufficient to remove undesired ingredients such as water and carbon dioxide but below that at which phosphorproducing reaction between the materials occurs and firing the materials at a temperature substantially above 1600‹ F. immediately following the pre-heating and without an intermediate cooling. There may be two pre-heating zones, one at about 1150‹ F., and the other at about 1350‹ F., a firing zone at between 1900‹ and 2150‹ F., for example at about 2050‹ F., and a final cooling zone at well below 1000‹ F. Part of the cooling zone can be kept at about 660‹ F. and the remainder at about 360‹ F. The firing can take place at two temperatures, only the second higher one of which causes the formation of the phosphor. The materials can be moved through zones heated to different temperatures, and a flow of gas inert with respect to the materials, such as nitrogen, can be maintained over them, the direction of flow being the same as that of the movement during the pre-heating and opposite to that of the movement during the firing. The starting materials can be placed in an open silica boat, on a ceramic plate on rails, to a level between two-thirds and three-quarters of the inside height of the boat. When the starting materials contain compounds of antimony and chlorine, the atmosphere of antimony chloride accumulated above the materials during the firing is kept below atmospheric pressure.
GB4194259A 1958-12-10 1959-12-09 Method of and apparatus for making phosphors Expired GB936251A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US779370A US3093594A (en) 1958-12-10 1958-12-10 Method of making halophosphate phosphors
US779399A US3002933A (en) 1958-12-10 1958-12-10 Method of halophosphate phosphor manufacture

Publications (1)

Publication Number Publication Date
GB936251A true GB936251A (en) 1963-09-11

Family

ID=27119574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4194259A Expired GB936251A (en) 1958-12-10 1959-12-09 Method of and apparatus for making phosphors

Country Status (2)

Country Link
BE (1) BE585300A (en)
GB (1) GB936251A (en)

Also Published As

Publication number Publication date
BE585300A (en) 1960-04-01

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