Method for the manufacture of a luminophore

  • US 5,783,107 A
  • Filed: 12/09/1996
  • Issued: 07/21/1998
  • Est. Priority Date: 12/08/1995
  • Status: Expired due to Fees
First Claim
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1. A method for the manufacture of a luminophore comprising the following steps:

  • a) the weighing of the different constituent materials in the powder form;

    b) mixing in an aqueous medium;

    c) the evaporation of the liquid;

    d) the screening of the powder obtained with a mesh aperture of 100 μ

    m to disagglomerate the powder;

    e) baking at a temperature of 1 100°

    C. to 1400°

    C. in a neutral gas atmosphere wherein neutral gas is injected into the interior of the powder;

    f) the screening of the baked powder;

    g) crushing to reduce the size of the grains and then screening;

    h) the annealing of the crushed powder at a temperature ranging from 700°

    C. to 1200°

    C. so as to obtain a reorganization of the first atomic layers of the grains of the powder;

    i) the mixing of the annealed powder in an aqueous medium, and sedimentation and then removal of the upper part of the liquid containing the powder in suspension;

    j) the drying of the removed suspension and the screening of the powder obtained.

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