DE3433963A1 - Method for stabilising a suspension of luminescent material - Google Patents
Method for stabilising a suspension of luminescent materialInfo
- 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
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
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)
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 |
Family
ID=6245514
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)
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)
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 |
-
1984
- 1984-09-15 DE DE19843433963 patent/DE3433963A1/en not_active Ceased
Patent Citations (2)
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)
Title |
---|
"Berichte der Bunsengesellschaft" 67, (1963), Nr. 4, S. 439-444 * |
Cited By (5)
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8120 | Willingness to grant licences paragraph 23 | ||
8110 | Request for examination paragraph 44 | ||
8131 | Rejection |