GB1514785A - Preparing luminescent materials - Google Patents

Preparing luminescent materials

Info

Publication number
GB1514785A
GB1514785A GB3952475A GB3952475A GB1514785A GB 1514785 A GB1514785 A GB 1514785A GB 3952475 A GB3952475 A GB 3952475A GB 3952475 A GB3952475 A GB 3952475A GB 1514785 A GB1514785 A GB 1514785A
Authority
GB
United Kingdom
Prior art keywords
alkaline earth
fluorohalide
earth metal
mole
fluoride
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
GB3952475A
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 Electronics UK Ltd
Original Assignee
Philips Electronic and Associated 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 Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1514785A publication Critical patent/GB1514785A/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
    • C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
    • C09K11/7732—Halogenides
    • C09K11/7733—Halogenides with alkali or alkaline earth metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

1514785 Luminescent materials PHILIPS ELECTRIC & ASSOCIATED INDUSTRIES Ltd 26 Sept 1975 [1 Oct 1974] 39524/75 Heading C4S A method of preparing a luminescent alkaline earth metal fluorohalide activated by bivalent Eu of formula Ba 1-x-y- p Sr x Ca y Eu p FX wherein 1#x+y+p, 0À20#y#0, 0À20#y#0, 0À20#p#0À001 and X is one or more of Cl, Br or I, comprises making an aqueous suspension of alkaline earth metal fluoride containing 1 mole of dissolved alkaline earth metal halide (other than fluoride) per mole of alkaline earth fluoride and which may contain Eu as europium halide in amount at most equal the amount desired in the fluorohalide, evaporating the suspension to dryness at 50‹ to 250‹C, mixing the resulting product with the amount (if any) of europium halide which still may be required, subjecting to at least one treatment at 600‹C to 1000‹C in a weakly reducing atmosphere, and, after cooling, treating at 600‹C to 850‹C in an inert or weakly reducing atmosphere. The phosphor produced exhibits reduced persistence as required for X-ray intensifier screens used with photographic film. Traces of oxygen which may increase persistance are avoided. Preferably p moles of EuX 3 /mole of fluorohalide are added after evaporation to dryness, and preferably the product is ground before final heating. Ba 1-p Eu p FCl is a preferred composition. The crystals have Pb/FCl structure and tetragonal symmetry. U.V. and electron excitation is mentioned.
GB3952475A 1974-10-01 1975-09-26 Preparing luminescent materials Expired GB1514785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7412917A NL176581C (en) 1974-10-01 1974-10-01 METHOD FOR PREPARING A LUMINESCENT NATURAL-POTASSIUM FLUORIDE HALOGENIDE ACTIVATED WITH Bivalent EUROPE ROENTGEN IMAGE REINFORCEMENT SCREEN.

Publications (1)

Publication Number Publication Date
GB1514785A true GB1514785A (en) 1978-06-21

Family

ID=19822201

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3952475A Expired GB1514785A (en) 1974-10-01 1975-09-26 Preparing luminescent materials

Country Status (8)

Country Link
JP (1) JPS573603B2 (en)
BE (1) BE833978A (en)
CA (1) CA1059747A (en)
DE (1) DE2541748C3 (en)
FR (1) FR2286872A1 (en)
GB (1) GB1514785A (en)
IT (1) IT1042928B (en)
NL (1) NL176581C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5944333B2 (en) * 1978-07-12 1984-10-29 富士写真フイルム株式会社 Radiographic image conversion method
JPS6090286A (en) * 1983-10-24 1985-05-21 Fuji Photo Film Co Ltd Method for converting radiation image
FR2554122B1 (en) * 1983-11-02 1987-03-20 Rhone Poulenc Spec Chim NOVEL COMPOSITION FOR MARKING DOCUMENTS AND METHOD FOR VERIFYING THE AUTHENTICITY OF SUCH DOCUMENTS
DE3347207A1 (en) * 1983-12-27 1985-07-11 Siemens AG, 1000 Berlin und 8000 München X-RAY IMAGE STORAGE SCREEN
JPS60161478A (en) * 1983-12-28 1985-08-23 Fuji Photo Film Co Ltd Fluorescent material and radiation image conversion panel using same
DE3574985D1 (en) * 1984-07-13 1990-02-01 Fuji Photo Film Co Ltd PHOSPHORUS, METHOD FOR STORING AND REPLAYING A RADIATION IMAGE, AND SCREEN FOR STORING A RADIATION IMAGE.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1555624A (en) * 1967-09-14 1969-01-31

Also Published As

Publication number Publication date
CA1059747A (en) 1979-08-07
BE833978A (en) 1976-03-29
DE2541748B2 (en) 1978-02-09
NL7412917A (en) 1976-04-05
IT1042928B (en) 1980-01-30
DE2541748C3 (en) 1978-10-19
NL176581B (en) 1984-12-03
JPS5161499A (en) 1976-05-28
FR2286872B1 (en) 1979-09-07
NL176581C (en) 1985-05-01
DE2541748A1 (en) 1976-04-08
FR2286872A1 (en) 1976-04-30
JPS573603B2 (en) 1982-01-22

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Legal Events

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