DE3433963A1 - Method for stabilising a suspension of luminescent material - Google Patents

Method for stabilising a suspension of luminescent material

Info

Publication number
DE3433963A1
DE3433963A1 DE19843433963 DE3433963A DE3433963A1 DE 3433963 A1 DE3433963 A1 DE 3433963A1 DE 19843433963 DE19843433963 DE 19843433963 DE 3433963 A DE3433963 A DE 3433963A DE 3433963 A1 DE3433963 A1 DE 3433963A1
Authority
DE
Germany
Prior art keywords
suspension
phosphors
acid
phosphor
silicate
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.)
Ceased
Application number
DE19843433963
Other languages
German (de)
Inventor
Kanagaratnam 7915 Elchingen Anandasivam
Rolf Grießmayr
Georg 7909 Dornstadt Groner
Irene 7958 Laupheim Kienle
Rainer 7900 Ulm Kolbeck
Ulrich 7900 Ulm Kube
Hermann Dr.Rer.Nat. Widmann
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19843433963 priority Critical patent/DE3433963A1/en
Publication of DE3433963A1 publication Critical patent/DE3433963A1/en
Ceased 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
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
    • 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
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor

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

Abstract

In order to prevent coagulation in suspensions containing silicate or aluminate luminescent materials it is proposed to admix the suspension with an organic acid.

Description

Beschreibungdescription

Verfahren zum Stabilisieren einer Leuchtstoffsuspension Die vorliegende Erfindung betrifft ein Verfahren nach dem Oberbegriff des Patentanspruches 1.Method for stabilizing a phosphor suspension The present The invention relates to a method according to the preamble of claim 1.

Zur Herstellung von Leuchtschirmen für Kathodenstrahlröhren nach einem Photoprintverfahren werden wässerige Leuchtstoffsuspensionen verwendet, die aus einem homogenen Gemisch eines Leuchtstoffes mit einem Bindemittel, wie Polyvinylalkohol oder Polyvinylpyrrolidon und einem Sensibilisator, wie Dichromat oder einer Diazoverbindung bestehen.For the production of fluorescent screens for cathode ray tubes according to a Aqueous phosphor suspensions are used for photoprinting a homogeneous mixture of a phosphor with a binder such as polyvinyl alcohol or polyvinylpyrrolidone and a sensitizer such as dichromate or a diazo compound exist.

Bei Verwendung von Leuchtstoffen auf Silikat- bzw. Aluminatbasis, insbesondere Seltene Erden enthaltende Leuchtstoffe, wie z. B. P46-, P47-, P48- oder P43-Leuchtstoffe zeigen solche Suspensionen eine starke Neigung zu koagulieren, d. h. sie werden instabil und können in diesem Zustand nicht mehr zufriedenstellend verarbeitet werden.When using luminescent materials based on silicate or aluminate, in particular rare earths containing phosphors, such as. B. P46-, P47-, P48- or P43 phosphors show such suspensions a strong tendency to coagulate, d. H. they become unstable and can no longer be satisfactory in this state are processed.

Ganz besonders neigen mit Diazoverbindungen sensibilisierte Suspensionen mit Silikat- oder Alurninatleuchtstoffen dazu, zu koagulieren.Suspensions sensitized with diazo compounds are particularly prone to this with silicate or aluminum phosphors to coagulate.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eils Verfahren für eingangs genannte Leuchtstoffsuspensionen anzugeben, das die Verarbeitbarkeit solcher Suspensionen dadurch erleichtert und verbessert, daß die Gefahr der Suspension zu koagulieren beseitigt wird.The present invention is based on the object of a method for the fluorescent suspensions mentioned at the outset to indicate the processability such suspensions thereby eased and improved that the risk of suspension to coagulate is eliminated.

Diese Aufgabe wird durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale gelöst.This task is achieved by the characterizing part of claim 1 specified features solved.

Durch das beschriebene Verfahren wird die Verarbeitbarkeit der Leuchtstoffsuspensionen wesentlich erleichtert, da Lagerbedingungen, Temperaturbedingungen und Rührbedingungen wesentlich vereinfacht werden können. Gleichzeitig gehen die Ausfälle an hergestellten Leuchtschirmen zurück.The process described improves the processability of the phosphor suspensions much easier because storage conditions, temperature conditions and stirring conditions can be significantly simplified. At the same time, the failures go to manufactured ones Luminescent screens back.

Besonders geeignet als zuzusetzende organische Säuren sind Citronensäure, Weinsäure, Acrylsäure und Amidosulfonsäure bei Suspensionen, die als Leuchtstoffe Silikat- bzw.Particularly suitable organic acids to be added are citric acid, Tartaric acid, acrylic acid and sulfamic acid in suspensions that act as phosphors Silicate resp.

Aluminatleuchtstoffe, wie P46-, P47-, P48-Leuchtstoffe, insbesondere Leuchtstoffe auf Seltenerdbasis, wie P43-Leuchtstoffe, enthalten. Bevorzugt wird mit organischen Säuren ein pH-Wert von 1-6, vorzugsweise 2-3, eingestellt.Aluminate phosphors such as P46, P47, P48 phosphors, in particular Contain rare earth phosphors such as P43 phosphors. Is preferred a pH of 1-6, preferably 2-3, is set with organic acids.

Bei den Leuchtstoffen mit den üblichen Bezeichnungen P43, P46, P47 und P48 handelt es sich um Leuchtstoffe nachfolgend angegebener Zusammensetzungen.In the case of the phosphors with the usual designations P43, P46, P47 and P48 are phosphors of the compositions given below.

P46 = Y3Al5O12 : Ce P47 = Y2SiO5 : Ce P48 = Y3Al5 012 : Ce + Y2SiO5 : Ce P43 = Gd202S : Tb. P46 = Y3Al5O12: Ce P47 = Y2SiO5: Ce P48 = Y3Al5 012: Ce + Y2SiO5 : Ce P43 = Gd202S: Tb.

Claims (4)

Patentansprüche 1. Verfahren zum Stabilisieren einer wässerigen Leuchtstoffsuspension, die'ein für optische Strahlung sensibilisiertes Bindemittel sowie einen Leuchtstoff auf Silikat-oder Aluminatbasis enthält, dadurch gekennzeichnet, daß der Suspension eine organische Säure, wie Citronensäure, Weinsäure, Acrylsäure oder Amidosulfonsäure, zugesetzt wird.Claims 1. A method for stabilizing an aqueous phosphor suspension, die'ein for optical radiation sensitized binder and a phosphor based on silicate or aluminate, characterized in that the suspension an organic acid such as citric acid, tartaric acid, acrylic acid or sulfamic acid, is added. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Suspension durch Zusetzen der organischen Säure auf einen pH-Wert von 1-6, insbesondere etwa 2-3, gebracht wird.2. The method according to claim 1, characterized in that the suspension by adding the organic acid to a pH of 1-6, especially about 2-3, is brought. 3. Verfahren nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet1 daß als Bindemittel mit einer Diazoverbindung oder einem Dichromat sensibilisierter Polyvinylalkohol oder Polyvinylpyrrolidon verwendet wird.3. The method according to claim 1 or claim 2, characterized in 1 that sensitized as a binder with a diazo compound or a dichromate Polyvinyl alcohol or polyvinyl pyrrolidone is used. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Suspension Silikat- oder Aluminatleuchtstoffes wie P46-, P47-Leuchtstoffe, insbesotldere Leuchtstoffe mit Seltenen Erden, wie P43-Leuchtstoff, enthält.4. The method according to any one of claims 1 to 3, characterized in that that the suspension of silicate or aluminate phosphors such as P46, P47 phosphors, in particular contains phosphors with rare earths, such as P43 phosphor.
DE19843433963 1984-09-15 1984-09-15 Method for stabilising a suspension of luminescent material Ceased DE3433963A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19843433963 DE3433963A1 (en) 1984-09-15 1984-09-15 Method for stabilising a suspension of luminescent material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843433963 DE3433963A1 (en) 1984-09-15 1984-09-15 Method for stabilising a suspension of luminescent material

Publications (1)

Publication Number Publication Date
DE3433963A1 true DE3433963A1 (en) 1986-03-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19843433963 Ceased DE3433963A1 (en) 1984-09-15 1984-09-15 Method for stabilising a suspension of luminescent material

Country Status (1)

Country Link
DE (1) DE3433963A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0423790A2 (en) * 1989-10-20 1991-04-24 Kasei Optonix, Ltd. Phosphors, method for treating the surface thereof and process for producing a phosphor screen
EP0768573A1 (en) * 1995-10-13 1997-04-16 Hitachi Chemical Co., Ltd. Phosphor-containing photosensitive resin composition for use in manufacturing plasma display panel
CN1304528C (en) * 2005-07-21 2007-03-14 大连理工大学 Ligand complex type rareearth activated alkaline earth aluminate long after glow luminous material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2318938A1 (en) * 1973-04-14 1974-10-31 Licentia Gmbh Process for the production of a fluorescent substance for a cathode ray tube and fluorescent suspensions used for it
DE2323324A1 (en) * 1973-05-09 1974-11-21 Licentia Gmbh Luminescent coatings for colour television tubes - with increased sensitivity to ultra-violet light, thus reducing exposure times

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2318938A1 (en) * 1973-04-14 1974-10-31 Licentia Gmbh Process for the production of a fluorescent substance for a cathode ray tube and fluorescent suspensions used for it
DE2323324A1 (en) * 1973-05-09 1974-11-21 Licentia Gmbh Luminescent coatings for colour television tubes - with increased sensitivity to ultra-violet light, thus reducing exposure times

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Berichte der Bunsengesellschaft" 67, (1963), Nr. 4, S. 439-444 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0423790A2 (en) * 1989-10-20 1991-04-24 Kasei Optonix, Ltd. Phosphors, method for treating the surface thereof and process for producing a phosphor screen
EP0423790A3 (en) * 1989-10-20 1991-10-30 Kasei Optonix, Ltd. Phosphors, method for treating the surface thereof and process for producing a phosphor screen
US5200250A (en) * 1989-10-20 1993-04-06 Kasei Optonix, Ltd. Phosphors, method for treating the surface thereof and process for producing a phosphor screen
EP0768573A1 (en) * 1995-10-13 1997-04-16 Hitachi Chemical Co., Ltd. Phosphor-containing photosensitive resin composition for use in manufacturing plasma display panel
CN1304528C (en) * 2005-07-21 2007-03-14 大连理工大学 Ligand complex type rareearth activated alkaline earth aluminate long after glow luminous material

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