GB1452898A - Phosphors - Google Patents

Phosphors

Info

Publication number
GB1452898A
GB1452898A GB5048973A GB5048973A GB1452898A GB 1452898 A GB1452898 A GB 1452898A GB 5048973 A GB5048973 A GB 5048973A GB 5048973 A GB5048973 A GB 5048973A GB 1452898 A GB1452898 A GB 1452898A
Authority
GB
United Kingdom
Prior art keywords
fluoride
alkali
heating
oct
gadolinium
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
GB5048973A
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Publication of GB1452898A publication Critical patent/GB1452898A/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
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7767—Chalcogenides
    • C09K11/7769—Oxides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)

Abstract

1452898 Luminescent materials RCA CORPORATION 30 Oct 1973 [30 Oct 1972] 50489/73 Heading C4S A method for preparing activated Y, or Gd or Y-Gd oxysulphide phosphors comprises heating between 700‹ and 1250‹ C. a mixture including (a) at least one of yttrium oxide and gadolinium oxide, (b) at least one of sodium fluoride, potassium fluoride, ammonium fluoride, yttrium fluoride and gadolinium fluoride in amount 0À01 to 0À30 gram atoms of fluoride radical/grm. atom of Y and/or Gd, (c) at least one activator in gram atom ratio to the Y and/or Gd of 0À001 to 0À01 and (d) a sulphur containing composition selected from alkali thiocyanates, alkali rhodanides, and compositions which yield alkali sulphides and polysulphides on heating, then cooling to room temperature. "Alkali" is defined to mean Na, K, NH 4 , Cs and Li. The process produces larger particles (e.g. 3À9 to 8À4 Á) including sintered agglomerates. Activators may be one or more of Dy, Er, Eu, Ho, Nd, Pr, Sm, Tb and Tm. Detailed preparations are included. Additives such as phosphates, sulphates, arsenates and/or germanates of one or more alkalis which are washed out after heating increase brightness. (Y 0À965 Eu 0À035 ) 2 O 2 S is specified and Tables I and II include details such as C.I.E. co-ordinates. The phosphor may be incorporated in an electron beam device.
GB5048973A 1972-10-30 1973-10-30 Phosphors Expired GB1452898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30229972A 1972-10-30 1972-10-30

Publications (1)

Publication Number Publication Date
GB1452898A true GB1452898A (en) 1976-10-20

Family

ID=23167149

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5048973A Expired GB1452898A (en) 1972-10-30 1973-10-30 Phosphors

Country Status (7)

Country Link
JP (1) JPS5210786B2 (en)
BE (1) BE806670A (en)
CA (1) CA1021147A (en)
FR (1) FR2204671B1 (en)
GB (1) GB1452898A (en)
IT (1) IT999710B (en)
NL (1) NL7314831A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4871471A (en) * 1987-05-20 1989-10-03 Mitsubishi Denki Kabushiki Kaisha Phosphor for cathode ray tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9901809D0 (en) * 1999-01-27 1999-03-17 Scarista Limited Highly purified ethgyl epa and other epa derivatives for psychiatric and neurological disorderes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4871471A (en) * 1987-05-20 1989-10-03 Mitsubishi Denki Kabushiki Kaisha Phosphor for cathode ray tube

Also Published As

Publication number Publication date
AU6155973A (en) 1975-04-24
JPS4976787A (en) 1974-07-24
NL7314831A (en) 1974-05-02
CA1021147A (en) 1977-11-22
FR2204671A1 (en) 1974-05-24
IT999710B (en) 1976-03-10
JPS5210786B2 (en) 1977-03-26
BE806670A (en) 1974-02-15
DE2354337B2 (en) 1976-02-19
FR2204671B1 (en) 1978-11-17
DE2354337A1 (en) 1974-05-09

Similar Documents

Publication Publication Date Title
GB1221133A (en) Rare earth activated yttrium and gadolinium oxy-chalcogenide phosphors
GB1163503A (en) Process for preparing phosphor
US2372071A (en) Luminescent material
GB1453991A (en) Luminescent materials
GB544160A (en) Improvements in luminescent materials
US2485903A (en) Vii type phosphor
GB1467010A (en) Luminescent material
GB1222909A (en) Phosphors
GB1452898A (en) Phosphors
US3856698A (en) Preparation of rare-earth oxysulfide luminescent material
GB1500902A (en) Phosphors and their preparation
US3647707A (en) Alkali monosulfide recrystallization of lanthanide oxysulfide luminescent material
US3563909A (en) Method of preparing a lanthanide activated yttrium,gadolinium or lanthanum oxysulfide luminescent material
JPS55135190A (en) Fluorescent substance and its manufacture
US3574131A (en) Process for preparing rare earth oxide phosphors
US3706666A (en) Method of manufacturing a luminescent oxysulphide
KR920701378A (en) Manufacturing method of rare earth oxysulfide phosphor
US3650975A (en) Rare earth oxide phosphors containing alkali metal silicates and germanates
GB1082561A (en) Phosphor and method of preparation thereof
US3582493A (en) Method for preparing rare earth oxide phosphors
US2310424A (en) Luminescent composition and method of producing the same
GB1138852A (en) Method for preparing a phosphor
US3562174A (en) Method of preparing a lanthamide activated yttrium,gadolinium,or lanthanum oxysulfide luminescent material
GB1393040A (en) Luminescent materials
GB1432733A (en) Luminescent materials

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee