GB818069A - Improvements to infra-red sensitive luminescent materials - Google Patents

Improvements to infra-red sensitive luminescent materials

Info

Publication number
GB818069A
GB818069A GB35764/55A GB3576455A GB818069A GB 818069 A GB818069 A GB 818069A GB 35764/55 A GB35764/55 A GB 35764/55A GB 3576455 A GB3576455 A GB 3576455A GB 818069 A GB818069 A GB 818069A
Authority
GB
United Kingdom
Prior art keywords
solution
strontium
strontium nitrate
purified
ammonia
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
GB35764/55A
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.)
SOC NOUVELLE OUTIL RBV RADIO
Original Assignee
SOC NOUVELLE OUTIL RBV RADIO
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 SOC NOUVELLE OUTIL RBV RADIO filed Critical SOC NOUVELLE OUTIL RBV RADIO
Publication of GB818069A publication Critical patent/GB818069A/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
    • C09K11/56—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing sulfur
    • C09K11/562—Chalcogenides
    • C09K11/567—Chalcogenides with alkaline earth metals

Landscapes

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

Abstract

In the production of an infra-red phosphor consisting of strontium sulphide, activators (Pb, Cs, Sm) and lithium fluoride as an auxiliary flux (see Group XL (a)), the strontium sulphide is obtained from a highly purified stronium nitrate (see below) by reaction with sulphuric acid and further reduction by ammonia or hydrogen at 1000 DEG C. The lithium fluoride is prepared by passing ammonia through distilled hydrofluoric acid until neutralization and reacting the ammonium fluoride so produced with lithium sulphate purified in the same manner as strontium nitrate below. The strontium nitrate is purified from heavy metal insoluble material by successive contacting of an aqueous solution thereof with a solution of oxyquinoline in chloroform or carbon tetrachloride followed by successive contacting of the strontium nitrate solution with a solution of diphenylthiocarbazone in the same solvents. The strontium nitrate is thereafter crystallized. Alternatively the strontium nitrate solution may be adjusted to a pH 4 by adding ammonia or acetic acid and a solution of oxyquinoline in chloroform added. After successive washings at this pH a second series of operations is performed at a pH=7 and then a similar washing procedure is performed with a solution of diphenylthiocarbazone in carbon tetrachloride pH's of 4, 7 and 10 successively. The strontium nitrate so purified is treated with twice distilled sulphuric acid and the strontium sulphate precipitate is washed with distilled ethyl alcohol, vacuum dried and reduced in an alumina crucible at 1000 DEG C. with ammonia or hydrogen. Specifications 659,455, 650,458 and 650,459, [all in Group XL (a)], are referred to.
GB35764/55A 1954-12-18 1955-12-13 Improvements to infra-red sensitive luminescent materials Expired GB818069A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR818069X 1954-12-18

Publications (1)

Publication Number Publication Date
GB818069A true GB818069A (en) 1959-08-12

Family

ID=9268685

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35764/55A Expired GB818069A (en) 1954-12-18 1955-12-13 Improvements to infra-red sensitive luminescent materials

Country Status (1)

Country Link
GB (1) GB818069A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6771019B1 (en) 1999-05-14 2004-08-03 Ifire Technology, Inc. Electroluminescent laminate with patterned phosphor structure and thick film dielectric with improved dielectric properties

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6771019B1 (en) 1999-05-14 2004-08-03 Ifire Technology, Inc. Electroluminescent laminate with patterned phosphor structure and thick film dielectric with improved dielectric properties
US6939189B2 (en) 1999-05-14 2005-09-06 Ifire Technology Corp. Method of forming a patterned phosphor structure for an electroluminescent laminate
US7586256B2 (en) 1999-05-14 2009-09-08 Ifire Ip Corporation Combined substrate and dielectric layer component for use in an electroluminescent laminate

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