Method of manufacturing a green phosphor
First Claim
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1. A method for the manufacture of a luminescent material having the formula:
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space="preserve" listing-type="equation">Y.sub.3 Al.sub.5 O.sub.12 ;
Tbwhich comprises the steps of;
preparing a mixture of Y2 O3, Al2 O3 and Tb4 O7 in amounts suitable for synthesis of Y3 Al5 O12 ;
Tb together with up to 30 mol % of a flux of BaF2, BaCl2, or mixtures thereof,heating the resulting mixture in a sealed vessel to a temperature between about 1300°
C. and about 1600°
C., to produce a product consisting predominantly of Y3 Al5 O12 ;
Tb, andleaching the resulting product with a leaching solution so as to remove the residual flux from said product wherein said flux is present in an amount sufficient to effect a luminescent material exhibiting a higher brightness than the material prepared as above absent the flux, and wherein said luminescent material exhibits a higher brightness than the luminescent material prepared as above but where the heating is conducted in an unsealed covered vessel.
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Abstract
A method for manufacturing a luminescent material having the formula:
Y.sub.3 Al.sub.5 O.sub.12 : Tb
in which the raw materials for the synthesis are combined in appropriate amounts together with a flux consisting of barium fluoride, barium chloride, or mixtures of the two and then heated in a sealed state to a temperature between about 1300° C. and 1600° C. The resultant product is then leached with an alkaline or acid solution to remove the residual flux from the product.
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Citations
6 Claims
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1. A method for the manufacture of a luminescent material having the formula:
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space="preserve" listing-type="equation">Y.sub.3 Al.sub.5 O.sub.12 ;
Tbwhich comprises the steps of; preparing a mixture of Y2 O3, Al2 O3 and Tb4 O7 in amounts suitable for synthesis of Y3 Al5 O12 ;
Tb together with up to 30 mol % of a flux of BaF2, BaCl2, or mixtures thereof,heating the resulting mixture in a sealed vessel to a temperature between about 1300°
C. and about 1600°
C., to produce a product consisting predominantly of Y3 Al5 O12 ;
Tb, andleaching the resulting product with a leaching solution so as to remove the residual flux from said product wherein said flux is present in an amount sufficient to effect a luminescent material exhibiting a higher brightness than the material prepared as above absent the flux, and wherein said luminescent material exhibits a higher brightness than the luminescent material prepared as above but where the heating is conducted in an unsealed covered vessel. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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Current AssigneeSony Corporation (Sony Group Corp.)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsOhno, Katsutoshi, Abe, Tomohiko, Hoshina, heir, by Aya, Hoshina, heir, by Ken-Nosuke, Hoshina, heir, by Ikuko, Hoshina, deceased, Teruhiko
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Primary Examiner(s)Cooper, Jack
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Application NumberUS06/430,952Time in Patent Office705 DaysField of Search252/301.4 RUS Class Current252/301.40RCPC Class CodesC09K 11/7774 Aluminates
