DE2850081A1 - Red phosphor esp. for colour TV screen - has phosphor particles with red iron oxide pigment coating obtd. by thermal decomposition of organic iron cpd. - Google Patents

Red phosphor esp. for colour TV screen - has phosphor particles with red iron oxide pigment coating obtd. by thermal decomposition of organic iron cpd.

Info

Publication number
DE2850081A1
DE2850081A1 DE19782850081 DE2850081A DE2850081A1 DE 2850081 A1 DE2850081 A1 DE 2850081A1 DE 19782850081 DE19782850081 DE 19782850081 DE 2850081 A DE2850081 A DE 2850081A DE 2850081 A1 DE2850081 A1 DE 2850081A1
Authority
DE
Germany
Prior art keywords
red
iron
phosphor
iron oxide
thermal decomposition
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
DE19782850081
Other languages
German (de)
Inventor
Bruno Bolz
Gerhard Kroenes
Otto Marzel
Anton Schaub
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 DE19782850081 priority Critical patent/DE2850081A1/en
Publication of DE2850081A1 publication Critical patent/DE2850081A1/en
Ceased legal-status Critical Current

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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

Abstract

Red phosphor, esp. for colour TV screens, has pigment particles (I) with red body colour adhering to the surface of the phosphor particles (II), (I) consisting of Fe oxide particles. Pref. (I) can be formed on and/or bonded to (II). (II) are based on lanthanide oxide or oxysulphide e.g. Y2O3:Eu or Y2(O, S)3:Eu. (I) are formed by the thermal decomposition of Fe formate, oxalate, acetate, tartrate etc., esp. Fe acetylacetonate at 200-1000 (700) degrees C. (I) have high transparency, leading to a high light yield, and high resistance to mechanical handling and adhere well to the surface of (II).

Description

Beschreibungdescription

Rotleuchtstoffe Die,vorliegende Erfindung betrifft einen Rotleuchtstoff, insbesondere für Leuchtschirme von Farbbildkathodenstrahlröhren, mit an der Oberfläche der Leuchtstoffkörner haftenden Pigmentteilchen roter Körperfarbe.Red fluorescent substances The present invention relates to a red fluorescent substance, especially for fluorescent screens of color cathode ray tubes, with on the surface pigment particles of red body color adhering to the phosphor grains.

Zur Verbesserung des Kontrastes von Leuchtschirnsen für Farbbildkathodenstrahlröhren ist es bereits bekannt, rotemittierende Leuchtstoffe zu verwenden, deren Oberfläche eine Pigmentierung roter Körperfarbe aufweist. Als Pigmentmaterial sind bereits Cadmiumsulfoselenid und Eisenoxid bekannt.To improve the contrast of light screens for color cathode ray tubes it is already known to use red-emitting phosphors, their surface has a pigmentation of red body color. As a pigment material are already Cadmium sulfoselenide and iron oxide are known.

Rotpigmente auf Cadmiumsulfoselenidbasis sind giftig und werden deshalb nicht gern verwendet. Andererseits ist es schwierig, Eisenoxidpigment herzustellen, das als Pigmentbeschichtung von Leuchtstoffkörner genügend transparent ist und auch bei mechanischen Reib'vorgängen seine Körperfarbe nicht verändert.Red pigments based on cadmium sulfoselenide are poisonous and therefore become not used with pleasure. On the other hand, it is difficult to make iron oxide pigment, which is sufficiently transparent as a pigment coating of phosphor grains and also its body color does not change during mechanical rubbing processes.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen neuen Rotleuchtstoff anzugeben, der Eisenoxid roterKörperfarbc als Pigment aufweist, das eine erhöhte Transparenz sowie eine hohe Widerstandsfähigkeit gegen mechanischc Behandlung aufweist.The present invention is based on the object of a new one Indicate red fluorescent material which has iron oxide of red body color as a pigment which increased transparency and high resistance to mechanical c Having treatment.

Gemäß der Erfindung wird vorgeschlagen, daß die Pigmentteilchen aus durch thermische Zersetzung von organischen Eisenverbindungen gebildeten Eisenoxidteilchen bestehen.According to the invention it is proposed that the pigment particles from iron oxide particles formed by thermal decomposition of organic iron compounds exist.

Der beschriebene Leuchtstoff besitzt eine hohe Lichtausbeute, da das beschriebene Pigment eine hohe Transparenz im roten Emissionsbereich des Leuchtstofes aufweist. Besonders geeignet sind Rotleuchtstoffe auf Basis der Seltenerdmetalloxide bzw. der Seltenerdmetalloxysulfide. Der beschriebene Leuchtstoff weist weiterhin eine sehr gute Bearbeitbarkeit auf, insbesondere deshalb, weil das Eisenoxidpigment eine sehr große mechanische Stabilität besitzt, So ist es von großem Vorteil, daß gemäß der Erfindung pigmentierte Rotleuchtstoffe ohne weiteres Reibprozessen ausgesetzt werden können, ohne daß sich dadurch die Körperfarbe des Pigmentes störend verändern wurde.The luminescent material described has a high luminous efficacy because that pigment described has high transparency in the red emission range of the phosphor having. Red fluorescent materials based on rare earth metal oxides are particularly suitable or the rare earth metal oxysulfide. The phosphor described also has very good machinability, especially because the iron oxide pigment has a very high mechanical stability, so it is of great advantage that exposed according to the invention pigmented red fluorescent materials without further rubbing processes without the body color of the pigment changing in a disturbing way became.

Als organische Eisenverbindungen werden bevorzugt Salze einer organischen Säure, Weinsäure, Oxalsäure, Essigsäure, Ameisensäure usw. verwendet. Ein bevorzugtes Salz ist Eisenacetylacetonat. Die thermische Zersetzung dieser organischen Eisenverbindungen erfolgt zweckmäßig zwischen 200 und 12000 C, insbesondere bei etwa 7000 C.As organic iron compounds, salts of an organic one are preferred Acid, tartaric acid, oxalic acid, acetic acid, formic acid, etc. are used. A preferred one Salt is iron acetylacetonate. The thermal decomposition of these organic iron compounds takes place expediently between 200 and 12000 C, in particular at about 7000 C.

Gemäß einer Weiterbildung der Erfindung wird das Eisenoxydpigment direkt auf der Oberfläche der Leuchtstoffkörner abgeschieden. Durch die extrem feine erfindungagemSß erzielbare Teilchengröße wird eine sehr gute Haftung des Pigments an der Kornoberfläche erzielt.According to a further development of the invention, the iron oxide pigment is used deposited directly on the surface of the phosphor grains. Due to the extremely fine The particle size achievable according to the invention is very good adhesion of the pigment achieved on the grain surface.

Claims (8)

Patentansprüche 1. Rotleuchtstoff, insbesondere für Leuchtschirme von Farbbildkathodenstrahlröhren, mit an der Oberfläche der Leuchtstoffkörner haftenden Pigmentteilchen roter Körperfarbe, dadurch gekennzeichnet, daß die Pigmentteilchen aus durch thermische Zersetzung von organischen Eisenverbindungen gebildeten Eisenoxydteilchen bestehen.Claims 1. Red fluorescent material, in particular for fluorescent screens of color cathode ray tubes, with adhering to the surface of the phosphor grains Pigment particles of red body color, characterized in that the pigment particles from iron oxide particles formed by the thermal decomposition of organic iron compounds exist. 2. Rotleuchtstoff nach Anspruch 1, dadurch gekennzeichnet, daß die Pigmentteilchen aus auf den Kornoberflächen gebildeten Eisenoxydteilchen bestehen.2. red fluorescent substance according to claim 1, characterized in that the Pigment particles consist of iron oxide particles formed on the grain surfaces. 3. Rotleuchtstoff nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß die Pigmentteilchen aus an den Kornoberflächen angeklebten Eisenoxydteilchen bestehen.3. red fluorescent substance according to claim 1 or claim 2, characterized in that that the pigment particles consist of iron oxide particles adhered to the grain surfaces exist. 4. Rotleuchtstoff nach einem der Ansprüche 1 bis 3, gekennzeichnet durch seine Ausbildung als Leuchtstoff auf Seltenerdmetlloxid-oder Seltenerdmetalloxysulfidbasis, wie mit Europium dotierter Yttriumoxyd- oder Yttriumoxysulfidleuchtstoff.4. red fluorescent substance according to one of claims 1 to 3, characterized due to its formation as a fluorescent substance based on rare earth metal oxide or rare earth metal oxysulfide, such as yttrium oxide or yttrium oxysulfide phosphor doped with europium. 5. Verfahren zur erstellung eines Rotleuchtstoffes nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zur Bildung der Eisenoxydteilchen eine organische Eisenverbindung thermisch zersetzt wird.5. Process for the production of a red fluorescent substance according to one of the Claims 1 to 4, characterized in that for the formation of the iron oxide particles an organic iron compound is thermally decomposed. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß als organische Eisenverbindung ein eisenhaltiges Salz einer organischen Säure, wie Ameisensäure, Oxalsäure, Essigsäure, Weinsäure etc. thermisch zersetzt wird.6. The method according to claim 5, characterized in that as organic Iron compound an iron-containing salt of an organic acid, such as formic acid, Oxalic acid, acetic acid, tartaric acid etc. is thermally decomposed. 7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß Eisenacetylacetonat thermisch zersetzt wird.7. The method according to claim 5 or 6, characterized in that iron acetylacetonate is thermally decomposed. 8. Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß die thermi,,che Zersetzung bei Temperaturen zwischen 2000 C und 1000°C, insbeßondere bei etwa 7000 C vorgenommen wird.8. The method according to any one of claims 5 to 7, characterized in that that the thermal decomposition at temperatures between 2000 C and 1000 ° C, in particular is made at about 7000 C.
DE19782850081 1978-11-18 1978-11-18 Red phosphor esp. for colour TV screen - has phosphor particles with red iron oxide pigment coating obtd. by thermal decomposition of organic iron cpd. Ceased DE2850081A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782850081 DE2850081A1 (en) 1978-11-18 1978-11-18 Red phosphor esp. for colour TV screen - has phosphor particles with red iron oxide pigment coating obtd. by thermal decomposition of organic iron cpd.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782850081 DE2850081A1 (en) 1978-11-18 1978-11-18 Red phosphor esp. for colour TV screen - has phosphor particles with red iron oxide pigment coating obtd. by thermal decomposition of organic iron cpd.

Publications (1)

Publication Number Publication Date
DE2850081A1 true DE2850081A1 (en) 1980-05-29

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Application Number Title Priority Date Filing Date
DE19782850081 Ceased DE2850081A1 (en) 1978-11-18 1978-11-18 Red phosphor esp. for colour TV screen - has phosphor particles with red iron oxide pigment coating obtd. by thermal decomposition of organic iron cpd.

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3012055A1 (en) * 1980-03-28 1981-10-08 Videocolor GmbH, 7900 Ulm Pigmenting phosphor particles by wet process with calcination - in air to increase adhesion and impart hydrophilic nature, useful in colour picture tube
EP0529098A1 (en) * 1991-03-14 1993-03-03 Kasei Optonix, Ltd. Color cathode-ray tube
EP0599407A2 (en) * 1992-11-26 1994-06-01 Philips Patentverwaltung GmbH Coating process of red luminescent phosphor particle with hematite
US5382452A (en) * 1992-12-18 1995-01-17 E. I. Du Pont De Nemours And Company Luminescent materials prepared by coating luminescent compositions onto substrate particles
US5518808A (en) * 1992-12-18 1996-05-21 E. I. Du Pont De Nemours And Company Luminescent materials prepared by coating luminescent compositions onto substrate particles
US5643674A (en) * 1992-12-18 1997-07-01 E. I. Du Pont De Nemours And Company Luminescent materials prepared by coating luminescent compositions onto substrate particles

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB521099A (en) * 1938-11-07 1940-05-13 British Thomson Houston Co Ltd Improvements in and relating to luminescent powders, and methods of manufacturing the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB521099A (en) * 1938-11-07 1940-05-13 British Thomson Houston Co Ltd Improvements in and relating to luminescent powders, and methods of manufacturing the same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3012055A1 (en) * 1980-03-28 1981-10-08 Videocolor GmbH, 7900 Ulm Pigmenting phosphor particles by wet process with calcination - in air to increase adhesion and impart hydrophilic nature, useful in colour picture tube
EP0529098A1 (en) * 1991-03-14 1993-03-03 Kasei Optonix, Ltd. Color cathode-ray tube
EP0529098A4 (en) * 1991-03-14 1993-08-04 Kasei Optonix, Ltd. Color cathode-ray tube
US5394055A (en) * 1991-03-14 1995-02-28 Kasei Optonix Color picture tube with the fluorescent film of the red emission component having a mixture of europium activated rare earth oxide phosphors
EP0599407A2 (en) * 1992-11-26 1994-06-01 Philips Patentverwaltung GmbH Coating process of red luminescent phosphor particle with hematite
EP0599407A3 (en) * 1992-11-26 1994-07-27 Philips Patentverwaltung Coating process of red luminescent phosphor particle with hematite.
US5382452A (en) * 1992-12-18 1995-01-17 E. I. Du Pont De Nemours And Company Luminescent materials prepared by coating luminescent compositions onto substrate particles
US5518808A (en) * 1992-12-18 1996-05-21 E. I. Du Pont De Nemours And Company Luminescent materials prepared by coating luminescent compositions onto substrate particles
US5643674A (en) * 1992-12-18 1997-07-01 E. I. Du Pont De Nemours And Company Luminescent materials prepared by coating luminescent compositions onto substrate particles

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