GB691335A - Improvements in or relating to methods of making luminescent screens - Google Patents

Improvements in or relating to methods of making luminescent screens

Info

Publication number
GB691335A
GB691335A GB31095/50A GB3109550A GB691335A GB 691335 A GB691335 A GB 691335A GB 31095/50 A GB31095/50 A GB 31095/50A GB 3109550 A GB3109550 A GB 3109550A GB 691335 A GB691335 A GB 691335A
Authority
GB
United Kingdom
Prior art keywords
plate
activated
rock salt
evaporated
dec
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
GB31095/50A
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.)
Ernst Leitz Wetzlar GmbH
Original Assignee
Ernst Leitz Wetzlar GmbH
Ernst Leitz GmbH
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 Ernst Leitz Wetzlar GmbH, Ernst Leitz GmbH filed Critical Ernst Leitz Wetzlar GmbH
Publication of GB691335A publication Critical patent/GB691335A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K4/00—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
    • C30B13/08—Single-crystal growth by zone-melting; Refining by zone-melting adding crystallising materials or reactants forming it in situ to the molten zone
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Luminescent Compositions (AREA)

Abstract

691,335. Luminescent screens. LEITZ GES., E. Dec. 21, 1950 [Dec. 27, 1949], No. 31095/50. Class 39(i). A method of making a mono-crystal luminescent screen comprises depositing the matrix on an auxiliary plate 1 in a vacuum, and enforcing the growth of the crystal simultaneously with or subsequently to the deposition, e.g. by using a mask 2 with a narrow slot 5 which broadens towards the uncovered portion of the plate, a heated platinum 3 wire being moved along the centre line with a speed smaller than or equal to the speed of crystallization. In one example, potassium bromide is evaporated in vacuum on to a plate of orthoclase (potassium feldspar) heated to 350‹C, the deposit tempered for several hours and activated with thallium. Zinc sulphide is evaporated on to a rock salt plate, activated at 350‹C with lead or copper the plate cemented to glass and the rock salt dissolved away. Another screen is obtained by evaporating rock salt on to glass, activated with silver. Materials suitable as matrices are alkaline and alkaline earth halides and sulphides of zinc, gadolinum and manganese, the activators being Ag, Cu, Th, K, Rb, Mg, Ni, Pb, Sr, Ba, Y and other rare earth metals.
GB31095/50A 1949-12-27 1950-12-21 Improvements in or relating to methods of making luminescent screens Expired GB691335A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE691335X 1949-12-27

Publications (1)

Publication Number Publication Date
GB691335A true GB691335A (en) 1953-05-13

Family

ID=6601090

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31095/50A Expired GB691335A (en) 1949-12-27 1950-12-21 Improvements in or relating to methods of making luminescent screens

Country Status (1)

Country Link
GB (1) GB691335A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000173B (en) * 1977-06-24 1982-02-03 Philips Nv Luminescent screen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000173B (en) * 1977-06-24 1982-02-03 Philips Nv Luminescent screen

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