DE3321399A1 - Luminous substance and method for its production - Google Patents
Luminous substance and method for its productionInfo
- Publication number
- DE3321399A1 DE3321399A1 DE19833321399 DE3321399A DE3321399A1 DE 3321399 A1 DE3321399 A1 DE 3321399A1 DE 19833321399 DE19833321399 DE 19833321399 DE 3321399 A DE3321399 A DE 3321399A DE 3321399 A1 DE3321399 A1 DE 3321399A1
- Authority
- DE
- Germany
- Prior art keywords
- phosphate
- phosphor
- heavy metal
- metal salt
- added
- 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.)
- Granted
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
Description
Beschreibungdescription
Leuchtstoff sowie Verfahren zu dessen Herstellung Die vorliegende Erfindung betrifft einen Leuchtstoff für einen Leuchtschirm hoher Leuchtdichte, dessen Leuchtstoffpartikel mit einer Ummantelung versehen sind,-sowie ein Verfahren zu dessen Herstellung.Phosphor and process for its production The present The invention relates to a phosphor for a high luminance screen, the phosphor particles of which are provided with a coating, as well as a method for its production.
Es ist bereits bekannt, die einzelnen Leuchtstoffpartikel eines Leuchtstoffes zur Erzielung einer Filterwirkung mit einer Pigmentschicht zu ummanteln.It is already known that the individual phosphor particles of a phosphor to coat with a pigment layer to achieve a filter effect.
Es ist weiter bekannt, daß Leuchtstoffe insbesondere in energetisch hoch belasteten Leuchtschirmen von Kathodenstrahlröhren durch sogenanntes Einbrennen geschädigt werden können. An solchen Einberennatellen ist die Emissionsfähigkeit des Leuchtstoffes bleibend verringert oder gar völlig zerstört.It is also known that phosphors are particularly energetic highly stressed fluorescent screens of cathode ray tubes by so-called burn-in can be harmed. The emissivity is at such Einberennatellen of the phosphor is permanently reduced or even completely destroyed.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen neuartigen Leuchtstoff anzugeben, der eine erhöhte Einbrennfestigkeit besitzt und daher insbesondere für energetisch hoch belastete Leuchtschirme verwendbar ist.The present invention is based on the object of a novel Specify luminescent material which has an increased stoving resistance and therefore in particular can be used for luminous screens with high energy loads.
Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Leuchtstoffpartikel zur Erzielung einer erhöhten Einbrenn-Widerstandefähigkeit eine Schwermetallphosphat-Ummantelung aufweisen.This object is achieved according to the invention in that the phosphor particles Heavy metal phosphate coating to achieve increased stoving resistance exhibit.
In einer Weiterbildung der Erfindung ist ein bevorzugtes Verfahren zur Herstellung eines solchen Leuchtstoffes angegeben.In a further development of the invention is a preferred method specified for the production of such a phosphor.
Die beschriebenen mit einer Schwermetallphosphatschicht ummantelten Leuchtstoffe eignen sich besonders für Elektronenstrahlröhren, deren Leuchtschirme eine hohe Leuchtdichte abverlangt wird, wie dies z. B. bei Feinpunktröhren der Fall ist. Es hat sich gezeigt, daß Leuchtstoffschichten mit erfindungsgemäß ummantelten Leuchtstoffpartikeln auch dann keine Emissionsschädigungen aufweisen, wenn sie über längere Zeit mit einem äußerst fein gebündelten hoch beschleunigten Elektronenstrahlbeaufschlagt werden. Als besonders geeignet haben sich die Phosphate des Zinks, des Cadmiums und insbesondere des Zirkons erwiesen. Diese beschriebenen Phosphate ergeben Phosphorpartikel, die mit einem weitgehend lückenlos geschlossenen Phosphatmantel umhüllt sind. Gemäß einem bevorzugten Verfahren wird der Leuchtstoff in Wasser mit einem Schwermetallsalz, z. B.The described coated with a heavy metal phosphate layer Phosphors are particularly suitable for cathode ray tubes and their fluorescent screens a high luminance is required, as z. B. the case with fine point tubes is. It has been shown that phosphor layers encased according to the invention Phosphor particles show no emission damage even if they are over exposed for a long time with an extremely finely focused, highly accelerated electron beam will. The phosphates of zinc and cadmium have proven to be particularly suitable and in particular of zirconium. These phosphates described result in phosphor particles, which are encased in a largely completely closed phosphate coat. According to A preferred method is the phosphor in water with a heavy metal salt, z. B.
mit Zinksalz, wie ZnSO4o 7H20, das in fester Form der wässerigen Leuchtstoffaufschlämmung zugegeben wird, in einer Kugelmühle gemahlen. Nach einer Zeit von 5 bis 60 Minuten wird der Aufschlämmung ein Phosphat, insbesondere Natriumhydrogenphosphat (NaH2PO4) in fester Form zugegeben und wiederum ca. 20 Minuten lang in einer Kugelmühle gemahlen. In einem Elektronenrastermikroskop kann man feststellen, daß die einzelnen Leuchtstoffpartikel fein getrennt vorhanden sind und mit einem geschlossenen Phosphatmantel umhüllt sind. Die mit einem solchen Leuchtstoff hergestellten Leuchtschirme weisen eine hohe Resistenz gegen Schädigungen durch hoch energetische Elektronenstrahlen auf.with zinc salt, such as ZnSO4o 7H20, which is in the solid form of the aqueous phosphor slurry is added, ground in a ball mill. After a period of 5 to 60 minutes the slurry becomes a phosphate, especially sodium hydrogen phosphate (NaH2PO4) added in solid form and again for about 20 minutes in one Ground ball mill. In a scanning electron microscope one can see that the individual phosphor particles are present finely separated and with a closed Phosphate coat are coated. The luminescent screens made with such a phosphor have a high resistance to damage caused by high-energy electron beams on.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833321399 DE3321399A1 (en) | 1983-06-14 | 1983-06-14 | Luminous substance and method for its production |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833321399 DE3321399A1 (en) | 1983-06-14 | 1983-06-14 | Luminous substance and method for its production |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3321399A1 true DE3321399A1 (en) | 1984-12-20 |
DE3321399C2 DE3321399C2 (en) | 1993-01-07 |
Family
ID=6201424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19833321399 Granted DE3321399A1 (en) | 1983-06-14 | 1983-06-14 | Luminous substance and method for its production |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3321399A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2920003A (en) * | 1958-06-11 | 1960-01-05 | Rca Corp | Coated phosphor particles |
US2965512A (en) * | 1958-10-30 | 1960-12-20 | Du Pont | Zinc pyrophosphate treated sulfide phosphors and their preparation |
US3963639A (en) * | 1973-05-29 | 1976-06-15 | Gte Laboratories Incorporated | Fluorescent lamp and method for the manufacture thereof |
-
1983
- 1983-06-14 DE DE19833321399 patent/DE3321399A1/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2920003A (en) * | 1958-06-11 | 1960-01-05 | Rca Corp | Coated phosphor particles |
US2965512A (en) * | 1958-10-30 | 1960-12-20 | Du Pont | Zinc pyrophosphate treated sulfide phosphors and their preparation |
US3963639A (en) * | 1973-05-29 | 1976-06-15 | Gte Laboratories Incorporated | Fluorescent lamp and method for the manufacture thereof |
Non-Patent Citations (1)
Title |
---|
Abstract über die JP 54-28 783 A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE3321399C2 (en) | 1993-01-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8120 | Willingness to grant licences paragraph 23 | ||
8110 | Request for examination paragraph 44 | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |