BE628181A - - Google Patents
Info
- Publication number
- BE628181A BE628181A BE628181DA BE628181A BE 628181 A BE628181 A BE 628181A BE 628181D A BE628181D A BE 628181DA BE 628181 A BE628181 A BE 628181A
- Authority
- BE
- Belgium
- Prior art keywords
- oxide
- europium
- strontium
- substance
- mixture
- Prior art date
Links
- 239000000126 substance Substances 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 9
- IATRAKWUXMZMIY-UHFFFAOYSA-N Strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 claims description 8
- 239000005084 Strontium aluminate Substances 0.000 claims description 7
- SKBIICZGWLAFIL-UHFFFAOYSA-N strontium;oxido(oxo)alumane Chemical compound [Sr+2].[O-][Al]=O.[O-][Al]=O SKBIICZGWLAFIL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052693 Europium Inorganic materials 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N al2o3 Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 claims description 5
- 229910001940 europium oxide Inorganic materials 0.000 claims description 5
- AEBZCFFCDTZXHP-UHFFFAOYSA-N europium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Eu+3].[Eu+3] AEBZCFFCDTZXHP-UHFFFAOYSA-N 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 150000002178 europium compounds Chemical class 0.000 claims description 2
- 238000005755 formation reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000003213 activating Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- RSEIMSPAXMNYFJ-UHFFFAOYSA-N Europium(III) oxide Chemical compound O=[Eu]O[Eu]=O RSEIMSPAXMNYFJ-UHFFFAOYSA-N 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- 229910016697 EuO Inorganic materials 0.000 description 1
- LEDMRZGFZIAGGB-UHFFFAOYSA-L Strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- SMYKVLBUSSNXMV-UHFFFAOYSA-J aluminum;tetrahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[Al+3] SMYKVLBUSSNXMV-UHFFFAOYSA-J 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- -1 magnesium tungsten Chemical compound 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 230000003595 spectral Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/20—Luminescent screens characterised by the luminescent material
-
- 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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7734—Aluminates
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K4/00—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Luminescent Compositions (AREA)
Description
<Desc/Clms Page number 1>
Substance photoluminescente synthétique et son procède de fa- brication.
La présente invention concerne une substance photoluminescente synthétique à utiliser dans les lampes élec- triques à décharge, dans les écrans des tubes à rayon cathodique ou dans les écrans des appareils radiologiques, ainsi qu'un procédé de préparation de ces substances.
On sait d'une manière générale que les subs- tances photoluminescentes consistent d'habitude en une matière de base à laquelle est incorporée une substance activante appro- priée. Par exemple des substances photoluminescentes connues se composent d'une matière de base formée par des oxydes ou silicates de métaux alcalino-terreux et d'une addition d'une substance activante, telle que l'europium, De môme, on trouva dans la littérature la description de sulfuras de métaux alcali- no-terreux activés par l'europium et l'indication de leur pou-
<Desc/Clms Page number 2>
voir Luminescent tous l'effet d'une excitation appropriée.
Or il a été découvert qu'on obtient des subs- tances photoluminescentes particulièrement intéressante* en ac- tivant l'aluminate de strontium par l'oxyde d'europium II. La proportion de l'oxyde d'europium Il ajouté à l'aluminate de strontium doit être comprise entre environ 2 et 8 moles % et on obtient des résultats particulièrement satisfaisante avec une concentration de 3 moles 5.
On prépare la substance photoluminescente de l'invention en faisant griller un Mélange d'oxyde de strontium, d'oxyde d'aluminium et d'oxyde d'ouropium en milieu réducteur.
On peut remplacer les oxydes de strontium et d'aluminium du mélange initial par des composés qui par chauffage forment les oxydes ou l'aluminate de strontium. De même, on peut remplacer l'oxyde d'europium par des composés d'europium qui par chauf- fage forment de l'oxyde d'europium. Les composés qui convien- nent à cet effet sont par exemple les carbonates, hydroxydes, etc. La température de grillage du mélange des matièrespre- mières est d'environ 1500 C.
La composition stoéchiométrique de l'aluminate de strontium, qui sert de matière de base de la substance photo-luminescente, peut être différente des proportions rela- tives de l'oxyde de strontium et de l'oxyde d'aluminium corres- pondant à la formule SrA12O4. Ces écarts sont courants dans la chimie des substances photo-luminescentes. Par exemple, on sait par expérience que la proprotion des éléments acides des composés qui servent de matières de base aux substances photo-luminescentes doit être souvent en excès d'environ 10 à 20% pour obtenir la plus forte luminescence.
Il est avanta- geux, pour faire augmenter l'intensité des substances photo- luminescentes d'aluminate de strontium de l'invention, d'ajouter un excès d'oxyde d'aluminium par rapport à la proportion sto- échiométrique,
La substance photo-luminescente de l'invention peut être excitée par exemple par les rayons ultra-violets, et
<Desc/Clms Page number 3>
elle l'est en particulier par les rayons ultra-violets de grande longueur d'onde émis par une lampe à vapeur de mercure à haute pression.
Ainsi qu'il ressort de la courbe du dessin ci-joint de la répartition spectrale de l'émission de la substance 0,9 Sro. 1A12O3.0,03 EuO excitée par la raie du mercure de 365 nm,elle rayonne dans une large bande du spectre dont le centre de gravité est dans le vert et correspond à peu près à 520 nm,
Le rendement quantitatif de la substance photo luminescente de l'invention est égal à 88% de celui du tungsta- te de magnésium. Si la température augmente, l'intensité de l'émission diminue lentement à une température supérieure à 1000 C.
@ Un exemple de la préparation d'une substance photo-luminescente de l'invention est donné ci-après :
On mélange intimement 13,28 g de SrCO3, 15,60 g d'Al (OH) et 1,00 g de Eu2O3. et on fait griller le mélange dans un courant de gaz de formation à 1500 C à trois reprises, chaque fois pendant une heure, et on le remélange à fond entre les diverses opérations de grillage,
La substance photo-luminescente ainsi obtenue peut servir d'une manière connue éventuellement en mélange avec d'autres subtances photo-luminescentesdans les lampes électri- ques à décharge,
dans les écrans des tubes à rayon cathodique ou dans les écrans des appareils radiologiques.
<Desc / Clms Page number 1>
Synthetic photoluminescent substance and its manufacturing process.
The present invention relates to a synthetic photoluminescent substance for use in electric discharge lamps, in screens of cathode ray tubes or in screens of x-ray apparatus, as well as to a process for the preparation of these substances.
It is generally known that photoluminescent substances usually consist of a base material to which a suitable activating substance is incorporated. For example known photoluminescent substances consist of a base material formed by oxides or silicates of alkaline earth metals and an addition of an activating substance, such as europium, Likewise, it has been found in the literature the description of sulfuras of alkaline earth metals activated by europium and the indication of their
<Desc / Clms Page number 2>
see Luminescent all the effect of appropriate excitation.
Now, it has been discovered that particularly advantageous photoluminescent substances are obtained by activating strontium aluminate with europium II oxide. The proportion of europium oxide II added to the strontium aluminate must be between approximately 2 and 8 mol% and particularly satisfactory results are obtained with a concentration of 3 mol 5.
The photoluminescent substance of the invention is prepared by roasting a mixture of strontium oxide, aluminum oxide and ouropium oxide in a reducing medium.
The oxides of strontium and aluminum in the initial mixture can be replaced by compounds which, on heating, form the oxides or the aluminate of strontium. Likewise, europium oxide can be replaced by europium compounds which upon heating form europium oxide. Compounds which are suitable for this are, for example, carbonates, hydroxides, etc. The roasting temperature of the raw material mixture is approximately 1500 C.
The stoichiometric composition of strontium aluminate, which serves as the base material of the photoluminescent substance, may be different from the relative proportions of strontium oxide and aluminum oxide corresponding to the same. formula SrA12O4. These deviations are common in the chemistry of photoluminescent substances. For example, it is known from experience that the proportion of the acid elements of the compounds which serve as the basis for the photoluminescent substances must often be in excess of about 10 to 20% in order to obtain the strongest luminescence.
It is advantageous, in order to increase the intensity of the strontium aluminate light-emitting substances of the invention, to add an excess of aluminum oxide relative to the stoechiometric proportion,
The photo-luminescent substance of the invention can be excited, for example, by ultra-violet rays, and
<Desc / Clms Page number 3>
it is used in particular by the ultra-violet rays of long wavelength emitted by a high pressure mercury vapor lamp.
As can be seen from the curve of the attached drawing of the spectral distribution of the emission of the substance 0.9 Sro. 1A12O3.0,03 EuO excited by the 365 nm mercury line, it radiates in a wide band of the spectrum whose center of gravity is in the green and corresponds approximately to 520 nm,
The quantitative yield of the photoluminescent substance of the invention is 88% of that of magnesium tungsten. If the temperature increases, the intensity of the emission slowly decreases at a temperature above 1000 C.
@ An example of the preparation of a photoluminescent substance of the invention is given below:
13.28 g of SrCO3, 15.60 g of Al (OH) and 1.00 g of Eu2O3 are intimately mixed. and the mixture is roasted in a stream of formation gas at 1500 ° C. three times, each time for one hour, and it is thoroughly remixed between the various roasting operations,
The photo-luminescent substance thus obtained can be used in a known manner optionally as a mixture with other photo-luminescent substances in electric discharge lamps,
in the screens of cathode ray tubes or in the screens of x-ray equipment.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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BE628181A true BE628181A (en) |
Family
ID=198178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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BE628181D BE628181A (en) |
Country Status (1)
Country | Link |
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BE (1) | BE628181A (en) |
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0
- BE BE628181D patent/BE628181A/fr unknown
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