DE4008409A1 - Silicate fluorescent material activated with manganese improvement - by heating fluorescent powder in air with intermediate cooling, for improved fluorescent screen efficiency - Google Patents

Silicate fluorescent material activated with manganese improvement - by heating fluorescent powder in air with intermediate cooling, for improved fluorescent screen efficiency

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Publication number
DE4008409A1
DE4008409A1 DE4008409A DE4008409A DE4008409A1 DE 4008409 A1 DE4008409 A1 DE 4008409A1 DE 4008409 A DE4008409 A DE 4008409A DE 4008409 A DE4008409 A DE 4008409A DE 4008409 A1 DE4008409 A1 DE 4008409A1
Authority
DE
Germany
Prior art keywords
fluorescent
manganese
air
improved
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.)
Withdrawn
Application number
DE4008409A
Other languages
German (de)
Inventor
Hermann Dr Rer Nat Widmann
Klaus Gerland
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 DE4008409A priority Critical patent/DE4008409A1/en
Publication of DE4008409A1 publication Critical patent/DE4008409A1/en
Withdrawn legal-status Critical Current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
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/59—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing silicon
    • C09K11/592—Chalcogenides
    • C09K11/595—Chalcogenides with zinc or cadmium

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

Abstract

Brightness of a silicate fluorescent material activated with Mn is improved by heating the fluorescent powder at least twice (3-5 times), in air at about 2/3 of the mfr. temp., i.e. between 750 - 1000 deg.C, (800-850 deg.C), with intermediate cooling. Pref. application is to a Mn-activated Zn orthosilicate fluorescent material. ADVANTAGE - Efficiency of fluorescent screen is improved.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Stei­ gerung der Helligkeit eines mit Mangan aktivierten Sili­ katleuchtstoffes.The present invention relates to a method for stei the brightness of a sili activated with manganese fluorescent.

Es ist bereits vorgeschlagen worden, mit Mangan aktivierte Fluoridleuchtstoffe vor Aufbringen auf eine Trägeroberflä­ che wie zum Beispiel auf einen Leuchtschirmträger einer Wärmebehandlung zu unterziehen, nach dem zuvor durch Mah­ len die Kristallstruktur verändert wurde.It has already been suggested to be activated with manganese Fluoride phosphors before application to a carrier surface such as on a fluorescent screen support To undergo heat treatment, according to which Mah len the crystal structure was changed.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Helligkeitsausbeute von manganaktivierten Silikatleucht­ stoffen zu verbessern.The present invention is based on the object  Brightness yield of manganese activated silicate light to improve fabrics.

Diese Aufgabe wird durch die im Kennzeichen des Pa­ tentanspruches 1 angegebenen Merkmale gelöst.This task is carried out by the Pa Tent claim 1 specified features solved.

Es hat sich gezeigt, daß durch zumindest zweimaliges Glü­ hen des pulverförmigen Leuchtstoffes mit dazwischenliegen­ den Abkühlen eine beachtliche Steigerung der Hellig­ keitsausbeute des so behandelten und danach zu einem Leuchtschirm verarbeiteten Leuchtstoffes erzielt werden konnte.It has been shown that by at least twice Glü hen the powdered phosphor with in between the cooling a considerable increase in the brightness yield of the so treated and then to one Luminous screen processed fluorescent can be achieved could.

Bei einem bevorzugten Ausführungsbeispiel wurde ein Zink­ orthosilikat (P1-Leuchtstoff) drei- bis fünfmal bei einer Temperatur, die bei etwa 2/3 der Herstellungstemperatur von 1200°C bis 1600°C lag an Luft geglüht. Die Glühtem­ peratur lag bei etwa 850°C. Die Glühdauer betrug etwa 30-180 Minuten (bevorzugt 120 Minuten).In a preferred embodiment, a zinc orthosilicate (P 1 phosphor) was air-annealed three to five times at a temperature that was about 2/3 of the manufacturing temperature from 1200 ° C to 1600 ° C. The annealed temperature was around 850 ° C. The annealing time was about 30-180 minutes (preferably 120 minutes).

Die Wertigkeit des Mangans bleibt auch nach dem Glühen po­ sitiv 2-wertig. Auch wird die Emissionscharakteristik nicht verändert. Zusätzlich läßt sich auch eine Verbesse­ rung der Verarbeitbarkeit feststellen.The value of the manganese remains po even after the glow sitiv 2-valued. Also the emission characteristics not changed. In addition, an improvement can also be made Determine the workability.

Claims (6)

1. Verfahren zur Steigerung der Helligkeit eines mit Man­ gan aktivierten Silikatleuchtstoffes durch Erhitzen des pulverförmigen Leuchtstoffes, gekennzeichnet durch ein mindestens zweimaliges Glühen an Luft bei etwa 2/3 der Herstellungstemperaturen mit dazwischenliegendem Abkühlen.1. A method for increasing the brightness of a man-activated silicate phosphor by heating the powdered phosphor, characterized by an at least two-time glow in air at about 2/3 of the manufacturing temperatures with cooling in between. 2. Verfahren nach Anspruch 1, gekennzeichnet durch 3- bis 5maliges Glühen mit dazwischenliegendem Abkühlen.2. The method according to claim 1, characterized by 3- to 5 times annealing with cooling in between. 3. Verfahren nach Anspruch 1 oder Anspruch 2, gekenn­ zeichnet durch Glühtemperaturen zwischen 750°C und 1000°C, insbesondere zwischen 800°C und 950°C.3. The method according to claim 1 or claim 2, characterized characterized by annealing temperatures between 750 ° C and 1000 ° C, especially between 800 ° C and 950 ° C. 4. Verfahren nach einem der Ansprüche 1 bis 3, gekenn­ zeichnet durch Abkühltemperaturen zwischen 200°C und Raumtemperatur.4. The method according to any one of claims 1 to 3, characterized characterized by cooling temperatures between 200 ° C  and room temperature. 5. Verfahren nach einem der Ansprüche 1 bis 4, gekenn­ zeichnet durch die Anwendung bei manganaktivierten Ortho­ silikatleuchtstoffen.5. The method according to any one of claims 1 to 4, characterized is characterized by its use in manganese-activated ortho silicate phosphors. 6. Verfahren nach einem der Ansprüche 1 bis 5, gekenn­ zeichnet durch die Anwendung bei einem manganaktivierten Zinkorthosilikatleuchtstoff (P1-Leuchtstoff).6. The method according to any one of claims 1 to 5, characterized by the application to a manganese-activated zinc orthosilicate phosphor (P 1 phosphor).
DE4008409A 1990-03-16 1990-03-16 Silicate fluorescent material activated with manganese improvement - by heating fluorescent powder in air with intermediate cooling, for improved fluorescent screen efficiency Withdrawn DE4008409A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4008409A DE4008409A1 (en) 1990-03-16 1990-03-16 Silicate fluorescent material activated with manganese improvement - by heating fluorescent powder in air with intermediate cooling, for improved fluorescent screen efficiency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4008409A DE4008409A1 (en) 1990-03-16 1990-03-16 Silicate fluorescent material activated with manganese improvement - by heating fluorescent powder in air with intermediate cooling, for improved fluorescent screen efficiency

Publications (1)

Publication Number Publication Date
DE4008409A1 true DE4008409A1 (en) 1991-09-19

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DE4008409A Withdrawn DE4008409A1 (en) 1990-03-16 1990-03-16 Silicate fluorescent material activated with manganese improvement - by heating fluorescent powder in air with intermediate cooling, for improved fluorescent screen efficiency

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DE (1) DE4008409A1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB509723A (en) * 1938-02-12 1939-07-20 Franco British Electrical Co Improvements in or relating to luminescent materials for use with electric dischargetubes
US2210087A (en) * 1934-01-23 1940-08-06 Rca Corp Process for synthesizing luminescent material
GB620835A (en) * 1944-09-25 1949-03-31 Thorn Electrical Ind Ltd Improvements in or relating to luminescent materials and methods of manufacturing the same
DE834417C (en) * 1950-01-03 1952-03-20 Patra Patent Treuhand Process for the production of manganese-activated zinc silicate phosphors, in particular for electric discharge lamps or fluorescent tubes
DE1009337B (en) * 1952-01-15 1957-05-29 Philips Nv Phosphor and process for its manufacture
GB843463A (en) * 1955-11-17 1960-08-04 British Thomson Houston Co Ltd Improvements in luminescent materials
GB864343A (en) * 1956-07-06 1961-04-06 Ass Elect Ind Improvements in luminescent materials
GB1198250A (en) * 1968-05-06 1970-07-08 Grace W R & Co Calcium Silicate Phosphor
DE1905879A1 (en) * 1968-03-15 1970-10-29 Grace W R & Co Process for the production of a zinc silicate phosphor

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210087A (en) * 1934-01-23 1940-08-06 Rca Corp Process for synthesizing luminescent material
GB509723A (en) * 1938-02-12 1939-07-20 Franco British Electrical Co Improvements in or relating to luminescent materials for use with electric dischargetubes
GB620835A (en) * 1944-09-25 1949-03-31 Thorn Electrical Ind Ltd Improvements in or relating to luminescent materials and methods of manufacturing the same
DE834417C (en) * 1950-01-03 1952-03-20 Patra Patent Treuhand Process for the production of manganese-activated zinc silicate phosphors, in particular for electric discharge lamps or fluorescent tubes
DE1009337B (en) * 1952-01-15 1957-05-29 Philips Nv Phosphor and process for its manufacture
GB843463A (en) * 1955-11-17 1960-08-04 British Thomson Houston Co Ltd Improvements in luminescent materials
GB864343A (en) * 1956-07-06 1961-04-06 Ass Elect Ind Improvements in luminescent materials
DE1905879A1 (en) * 1968-03-15 1970-10-29 Grace W R & Co Process for the production of a zinc silicate phosphor
DE1905879B2 (en) * 1968-03-15 1971-01-21 W R Grace & Co , New York(V St A ) Process for the production of manganese activated zinc phosphate phosphors
GB1198250A (en) * 1968-05-06 1970-07-08 Grace W R & Co Calcium Silicate Phosphor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
- Patents Abstracts of Japan JP 57105948 A, E-134 Oct.2,1982 Vol.6/No. 194 *
DE-Buch: Ullmanns Encydklopädie der techni- schen Chemie, 4. Auflage, Bd 16, Weinheim 1979, S. 190 *

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8139 Disposal/non-payment of the annual fee