[go: up one dir, main page]

DE3931691A1 - Increasing terbium-activated rare earth phosphor emission - by etching particle surfaces with aq. acid mixt. - Google Patents

Increasing terbium-activated rare earth phosphor emission - by etching particle surfaces with aq. acid mixt.

Info

Publication number
DE3931691A1
DE3931691A1 DE19893931691 DE3931691A DE3931691A1 DE 3931691 A1 DE3931691 A1 DE 3931691A1 DE 19893931691 DE19893931691 DE 19893931691 DE 3931691 A DE3931691 A DE 3931691A DE 3931691 A1 DE3931691 A1 DE 3931691A1
Authority
DE
Germany
Prior art keywords
rare earth
activated rare
acid
phosphors
etching
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
DE19893931691
Other languages
German (de)
Inventor
Rainer Dipl Phys Kolbeck
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.)
Thales Electron Devices 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 DE19893931691 priority Critical patent/DE3931691A1/en
Publication of DE3931691A1 publication Critical patent/DE3931691A1/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
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7767—Chalcogenides
    • C09K11/7769—Oxides
    • C09K11/7771—Oxysulfides
    • 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

Landscapes

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

Abstract

The light output of Tb-activated rare earth phosphors is increased by surface etching of the phosphor particles with an aq. mixt. of organic (pref. citric) and inorganic (pref. nitric) acids. USE/ADVANTAGE - The process is esp. useful for treating Tb-activated rare earth oxysulphide (e.g. yttrium oxysulphide) phosphors useful as green-emitting phosphors for low voltage electron beam tubes. Light emission is increased and considerable emission is obtained even on bombardment with relatively low energy electron beams.

Description

Die Erfindung betrifft ein Verfahren zur Erhöhung der Lichtausbeute von mit Terbium aktivierten Seltenerdleucht­ stoffen durch eine Oberflächenbehandlung der Leuchtstoff­ körner.The invention relates to a method for increasing the Luminous efficacy of terbium activated rare earth light fabrics by a surface treatment of the phosphor grains.

Mit Terbium aktivierte Seltenerdleuchtstoffe (SE-Leucht­ stoffe), insbesondere solche auf Oxysulfidbasis mit grüner Emission, besitzen gegenüber gleichartig emittierenden Leuchtstoffen auf Sulfidbasis den Vorteil, daß sie wesent­ lich schmalbandiger emittieren und ihr Emissionsverhalten in Abhängigkeit von der Energiezufuhr linearer ist. Beson­ ders in speziellen Kathodenstrahlröhren und solchen mit entsprechenden Selektivfiltern werden daher als grün emit­ tierende Leuchtstoffe solche mit Tb aktivierte SE-Leucht­ stoffe verwendet.Rare earth phosphors activated with terbium (SE illumin substances), especially those based on oxysulfide with green Emission, compared to emitting in the same way Sulphide-based phosphors have the advantage that they are essential emit more narrowly and their emission behavior is more linear depending on the energy supply. Especially in special cathode ray tubes and those with  corresponding selective filters are therefore emit green fluorescent materials such as those activated with Tb SE light fabrics used.

Bei Kathodenstrahlröhren für besondere Anwendungszwecke ist es ferner erwünscht, die Energieaufnahme zu reduzie­ ren. Mit niedriger Spannung betriebene Elektronenstrahl­ röhren sind nicht nur hinsichtlich des Aufbaus einfacher zu beherrschen, sondern sie benötigen z.B. auch weniger Ablenkleistung.For cathode ray tubes for special applications it is also desirable to reduce energy consumption Ren. Electron beam operated at low voltage tubes are not only simpler in terms of structure to master, but they need e.g. also less Deflection performance.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Erhöhung der Lichtausbeute von mit Tb akti­ vierten Se-Leuchtstoffen, insbesondere solchen grüner Lichtemission, anzugeben.The present invention is based on the object Process for increasing the luminous efficacy of Akt with Tb fourth Se phosphors, especially green ones Light emission, to be specified.

Diese Aufgabe wird durch die im Kennzeichen des Pa­ tentanspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of claim 1 .

Es hat sich gezeigt, daß die Lichtausbeute der genannten Leuchtstoffe durch die beschriebene Ätzbehandlung beacht­ lich erhöht werden konnte. Als Vorteil stellte sich dabei heraus, daß derart behandelte Leuchtstoffe schon bei Be­ aufschlagung mit Elektronenstrahlen verhältnismäßig nied­ riger Energie eine beachtliche Lichtausbeute aufwiesen.It has been shown that the luminous efficiency of the above Phosphors noted by the etching treatment described could be increased. It turned out to be an advantage out that phosphors treated in this way are already at Be impact with electron beams relatively low energy had a remarkable light output.

Als organische Säuren eigenen sich sowohl einbasische als auch mehrbasische Säuren. Als anorganische Säuren eignen sich sowohl oxydierende als auch nicht oxydierende Säuren.Both organic acids are suitable as organic acids also polybasic acids. Suitable as inorganic acids both oxidizing and non-oxidizing acids.

Ein bevorzugtes Verfahren zum Ätzen eines mit Tb aktivier­ ten Oxysulfidleuchtstoffes, z.B. eines Yttriumoxysulfid­ leuchtstoffes, besteht in der Behandlung des körnigen Leuchtstoffes in einem wässerigen Säuregemisch aus Citro­ nensäure und Salpetersäure in einem Volumensverhältnis von etwa 1 : 1 bei Temperaturen zwischen 90°C und 100°C.A preferred method for etching a Tb activated th oxysulfide phosphor, e.g. of an yttrium oxysulfide  fluorescent, consists in the treatment of the granular Phosphor in an aqueous acid mixture from Citro Nenoic acid and nitric acid in a volume ratio of about 1: 1 at temperatures between 90 ° C and 100 ° C.

Derartig behandelte, Tb-aktivierte SE-Leuchtstoffe weisen im Vergleich zu nicht behandelten gleichartigen Leucht­ stoffen eine hellere Körperfarbe auf. Die einzelnen Körner zeigen eine reguläre Kornausbildung mit glatten, lichtre­ flektierenden Kanten.Treated in this way, Tb-activated SE phosphors compared to untreated, similar lights create a lighter body color. The individual grains show regular grain formation with smooth, luminous reflective edges.

Claims (5)

1. Verfahren zur Erhöhung der Lichtausbeute von mit Ter­ bium aktivierten Seltenerdleuchtstoffen durch eine Ober­ flächenbehandlung der Leuchtstoffkörner, gekennzeichnet durch eine wässerige Ätzbehandlung der Leuchtstoffkörner mit einem Säuregemisch aus organischer und anorganischer Säure.1. Method for increasing the luminous efficacy of with Ter bium activated rare earth phosphors by a top surface treatment of the fluorescent grains, marked by an aqueous etching treatment of the phosphor grains with an acid mixture of organic and inorganic Acid. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als organische Säure Citronensäure verwendet wird.2. The method according to claim 1, characterized in that citric acid is used as the organic acid. 3. Verfahren nach Anspruch 1 oder Anspruch 2, dadurch ge­ kennzeichnet, daß als anorganische Säure Salpetersäure verwendet wird. 3. The method according to claim 1 or claim 2, characterized ge indicates that the inorganic acid is nitric acid is used.   4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Ätzen bei erhöhter Temperatur vor­ zugsweise bei 80°C bis 100°C, insbesondere bei 90°C bis 100°C, vorgenommen wird.4. The method according to any one of claims 1 to 3, characterized characterized in that the etching at elevated temperature before preferably at 80 ° C to 100 ° C, especially at 90 ° C to 100 ° C, is made. 5. Verfahren nach einem der Ansprüche 1 bis 4, gekenn­ zeichnet durch die Verwendung zum Ätzen eines mit Terbium aktivierten Seltenerd-Oxysulfid-Leuchtstoffes grüner Lich­ temission.5. The method according to any one of claims 1 to 4, characterized characterized by the use for etching one with terbium activated green light rare earth oxysulfide phosphor mission.
DE19893931691 1989-09-22 1989-09-22 Increasing terbium-activated rare earth phosphor emission - by etching particle surfaces with aq. acid mixt. Ceased DE3931691A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893931691 DE3931691A1 (en) 1989-09-22 1989-09-22 Increasing terbium-activated rare earth phosphor emission - by etching particle surfaces with aq. acid mixt.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893931691 DE3931691A1 (en) 1989-09-22 1989-09-22 Increasing terbium-activated rare earth phosphor emission - by etching particle surfaces with aq. acid mixt.

Publications (1)

Publication Number Publication Date
DE3931691A1 true DE3931691A1 (en) 1991-04-04

Family

ID=6390003

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19893931691 Ceased DE3931691A1 (en) 1989-09-22 1989-09-22 Increasing terbium-activated rare earth phosphor emission - by etching particle surfaces with aq. acid mixt.

Country Status (1)

Country Link
DE (1) DE3931691A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816469A1 (en) * 1996-06-26 1998-01-07 Nec Corporation Low voltage electron beam excitation phosphor display apparatus having brightness increased by reducing an oxide inevitably formed on a surface of an oxisulfide phosphor on manufacture
EP0846746A1 (en) * 1996-12-06 1998-06-10 Philips Patentverwaltung GmbH Phosphor manufacturing with a coating of hydroxycarboxylic acid
WO2003038011A2 (en) * 2001-11-01 2003-05-08 Oxonica Limited Luminescent nanomaterials
US8012371B2 (en) * 2005-08-24 2011-09-06 Koninklijke Philips Electronics N.V. Luminescent material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057499A1 (en) * 1981-01-09 1982-08-11 Hitachi, Ltd. Phosphor, process for the preparation thereof and a fluorescent screen having the phosphor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057499A1 (en) * 1981-01-09 1982-08-11 Hitachi, Ltd. Phosphor, process for the preparation thereof and a fluorescent screen having the phosphor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816469A1 (en) * 1996-06-26 1998-01-07 Nec Corporation Low voltage electron beam excitation phosphor display apparatus having brightness increased by reducing an oxide inevitably formed on a surface of an oxisulfide phosphor on manufacture
US5861713A (en) * 1996-06-26 1999-01-19 Nec Corporation Low voltage electron beam display apparatus having brightness increased by reducing an oxide inevitably formed on a surface of an oxisulfide phosphor on manufacture
EP0846746A1 (en) * 1996-12-06 1998-06-10 Philips Patentverwaltung GmbH Phosphor manufacturing with a coating of hydroxycarboxylic acid
WO2003038011A2 (en) * 2001-11-01 2003-05-08 Oxonica Limited Luminescent nanomaterials
WO2003038011A3 (en) * 2001-11-01 2003-06-12 Oxonica Ltd Luminescent nanomaterials
US8012371B2 (en) * 2005-08-24 2011-09-06 Koninklijke Philips Electronics N.V. Luminescent material

Similar Documents

Publication Publication Date Title
DE2446479C3 (en) Phosphor layer for a low-pressure mercury vapor discharge lamp
EP1078972B1 (en) fluorescent lamp for illumination purposes
AT508302B1 (en) LUMINESCENT MATERIAL
DE2954514C2 (en)
EP1132938A2 (en) Plasma display panel with UV-light emitting layer
DE3348146C2 (en)
DE1154215B (en) Inorganic phosphor and process for its manufacture
DE1496608A1 (en) Clear luminescent glass and process for its manufacture
DE2410134C3 (en) Borate phosphor
DE2247932C3 (en) Fluorescent layer for mercury vapor discharge lamps or cathode ray tubes
DE3537881C2 (en)
CH638558A5 (en) LUMINESCENT ALUMINATE.
DE2837867A1 (en) FLUORESCENT LAMP
DE3931691A1 (en) Increasing terbium-activated rare earth phosphor emission - by etching particle surfaces with aq. acid mixt.
DE3014355C2 (en)
DE69009789T2 (en) Luminous alkaline earth metal orthosilicate, fluorescent screen with such a silicate and low-pressure mercury vapor discharge lamp with such a screen.
DE1901693A1 (en) Luminous red fluorescent material for the screens of electron beam tubes
DE3024438A1 (en) LOW PRESSURE MERCURY STEAM DISCHARGE LAMP
DE2231068A1 (en) LOW PRESSURE MERCURY VAPOR DISCHARGE LAMP WITH A LUMINESCENT SILICATE
DE1810999C3 (en) Alkaline earth silicate phosphor
DE10043530A1 (en) Color screen with blue fluorescent layer
DE2660890C2 (en) Green luminescent mass
DE2053200A1 (en) Fluorescent
DE1572221B2 (en) RED LUMINESCENT FABRIC AND ITS USE
DE2035258C3 (en) Luminous screen for scanning tubes

Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8127 New person/name/address of the applicant

Owner name: AEG ELEKTRONISCHE ROEHREN GMBH, 89077 ULM, DE

8131 Rejection