Compound with base of an alkaline-earth, sulphur and...

C - Chemistry – Metallurgy – 01 – G

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C01G 15/00 (2006.01) C01F 7/68 (2006.01) C01G 1/12 (2006.01) C09K 11/62 (2006.01) C09K 11/64 (2006.01) C09K 11/84 (2006.01)

Patent

CA 2270577

The invention concerns a compound with a base of an alkaline-earth, sulphur and aluminium, gallium or indium, method for preparing same and use as luminophore. The compound is of formula AB¿2?S¿4? in which A represents an alkaline-earth, B aluminium, gallium or indium, and it is characterised in that it is in the form of a powder residual content of oxygen not more than 1.5 % and consists of particles of average size not more than 10µm. This compound is obtained by a method consisting in the following steps: forming a solution or a suspension containing salts of elements A and B, drying the solution or suspension by pulverisation; reacting the product obtained from the preceding step with carbon disulphide or with a mixture of hydrogen sulphide and carbon disulphide. The compound can be used as luminophore, in particular in cathodoluminescence.

La présente invention concerne un composé à base d'un alcalino-terreux, de soufre et d'aluminium, de gallium ou d'indium, son procédé de préparation et son utilisation comme luminophore. Le composé de l'invention répond à la formule AB2S4 dans laquelle A représente un alcalino-terreux, B l'aluminium, le gallium ou l'indium, et il est caractérisé en ce qu'il se présente sous forme d'une poudre de teneur résiduelle en oxygène d'au plus 1,5 % et constituée de particules de taille moyenne d'au plus 10 µm. Ce composé est obtenu par un procédé qui comporte les étapes suivantes: on forme une solution ou une suspension comprenant des sels des éléments A et B, on sèche par atomisation la solution ou la suspension; on fait réagir le produit obtenu à l'étape précédente avec du sulfure de carbone ou avec un mélange de sulfure d'hydrogène et de sulfure de carbone. Le composé de l'invention peut être utilisé comme luminaphore, notamment en cathodoluminescence.

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