GB1466869A - Light storage systems - Google Patents

Light storage systems

Info

Publication number
GB1466869A
GB1466869A GB2327373A GB2327373A GB1466869A GB 1466869 A GB1466869 A GB 1466869A GB 2327373 A GB2327373 A GB 2327373A GB 2327373 A GB2327373 A GB 2327373A GB 1466869 A GB1466869 A GB 1466869A
Authority
GB
United Kingdom
Prior art keywords
pulse
infra
red
intensity
duration
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
GB2327373A
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB2327373A priority Critical patent/GB1466869A/en
Publication of GB1466869A publication Critical patent/GB1466869A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/047—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using electro-optical elements
    • 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
    • C09K11/0805—Chalcogenides
    • C09K11/0811—Chalcogenides with zinc or cadmium
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source

Landscapes

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

Abstract

1466869 Electroluminescence DEFENCE SECRETARY OF STATE FOR 2 Aug 1974 [16 May 1973] 23273/73 Heading C4S [Also in Divisions G4 and H4] An electroluminescent device 10 for storing energy releasable in the form of light includes a ZnS phosphor doped with at least Pb as activator, the phosphor particles being coated with Cu, and the device being irradiated with infra-red so as to emit light after electrical excitation. Mn and Cu may be additional activators. Film 12 comprises phosphor particles in transparent polymethyl methacrylate resin, lamina 14 is of Al, and glass sheet 16 has conductive tin oxide strip 18. Pb concs. may be 0À03 to 0À54 wt. per cent, firing times may be ¢ to 5 hours and firing temperatures 800‹ to 1100‹ C. 4% Pb is included initially to allow for evaporation during firing. Mn may be in amount 10<SP>-3</SP> to 10<SP>-1</SP> wt. per cent, with initial concs. twice these values. Control 32 determines duration and intensity of excitation of device 10 by source 22 (e.g. variation of D.C. voltage or of pulse ht. or length of unidirectional pulses), and also commencement, duration and intensity of infra-red source 24 (e.g. GaAs, lamp, and 0À75 to 4 Ám. emission) and gate 40 operation, while photosensitive device 28 (e.g. a photodiode) (see Division Gl) may have two receptors and filter 48 responsive to green and orange respectively while optionally excluding infra-red in the case that a short infra-red pulse stimulates Pb only (green emission) while a longer pulse stimulates Pb and Mn to emit a green-orange mix. Repeated light pulses may result from a single excitation. The intensity increases as the infra-red pulse duration increases from 5 to 125 ms. and tends to constancy for greater duration. A particular sequence of operations is described to produce logic signals 0 and 1 and to operate as an information storage and retrieval apparatus (see Division G4). A mosaic of devices may display a radar track (see Division H4) with progressively dimmer spots indicating former positions. Ageing effects may be mitigated by pulse operation. The Cu coating promotes h.v. gradients, making D.C. operation practicable without impairing pulse or A.C. operation. Factors governing emission intensity are listed.
GB2327373A 1974-08-02 1974-08-02 Light storage systems Expired GB1466869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2327373A GB1466869A (en) 1974-08-02 1974-08-02 Light storage systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2327373A GB1466869A (en) 1974-08-02 1974-08-02 Light storage systems

Publications (1)

Publication Number Publication Date
GB1466869A true GB1466869A (en) 1977-03-09

Family

ID=10193010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2327373A Expired GB1466869A (en) 1974-08-02 1974-08-02 Light storage systems

Country Status (1)

Country Link
GB (1) GB1466869A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2595145A1 (en) * 1986-02-28 1987-09-04 Thomson Csf MEMORY VISUALIZATION SYSTEM
FR2616992A1 (en) * 1987-06-19 1988-12-23 Thomson Csf ADVANCED SENSITIZATION MEMORY VISUALIZATION SYSTEM AND METHOD USING THE SAME
FR2639898A1 (en) * 1988-10-27 1990-06-08 Brain John PORTABLE LIGHT BEACON

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2595145A1 (en) * 1986-02-28 1987-09-04 Thomson Csf MEMORY VISUALIZATION SYSTEM
EP0240384A1 (en) * 1986-02-28 1987-10-07 Thomson-Csf Memory imaging system
US4818877A (en) * 1986-02-28 1989-04-04 Thomson-Csf Memory display system
FR2616992A1 (en) * 1987-06-19 1988-12-23 Thomson Csf ADVANCED SENSITIZATION MEMORY VISUALIZATION SYSTEM AND METHOD USING THE SAME
EP0299813A1 (en) * 1987-06-19 1989-01-18 Thomson-Csf System for visualizing a latent image, and method of applying it
FR2639898A1 (en) * 1988-10-27 1990-06-08 Brain John PORTABLE LIGHT BEACON

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Legal Events

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