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Method of manufacturing a green phosphor

  • US 4,469,619 A
  • Filed: 09/30/1982
  • Issued: 09/04/1984
  • Est. Priority Date: 09/30/1981
  • Status: Expired due to Fees
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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