Particulate fluorescent material of (Y.sub.1-X" Eu.sub.x)203 an

Details Particulate fluorescent material of (Y.sub.1-X" Eu.sub.x)203 an Particulate fluorescent material of (Y.sub.1-X" Eu.sub.x)203 an

1994-02-15

1995-05-09

Bell, Mark L.

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

423263, C09K 1177

Patent

active

054137365

ABSTRACT:
A fluorescent material is disclosed which indludes substantially spherical particles each consisting of Y.sub.2 O.sub.3 and Eu.sub.2 O.sub.3 and having an average particle diameter of 90-210 nm and a narrow particle size distribution. The fluorescent material may be produced by heating an aqueous solution having a pH of 3 or less and containing a yttrium salt, a europium salt and urea at a temperature of at least 90.degree. C. to coprecipitate YOHCO.sub.3 and EuOHCO.sub.3 as particles having an average particle diameter of 110-270 nm. The resulting particles are then calcined at a temperature of at least 600.degree. C. to form spheres each consisting of Y.sub.2 O.sub.3 and Eu.sub.2 O.sub.3.

REFERENCES:
patent: 3457184 (1969-07-01), Kobayashi et al.
patent: 3484381 (1969-12-01), Yale et al.
patent: 3582493 (1971-06-01), Haynes et al.
patent: 5015452 (1991-05-01), Matijevic
Preparation of Spherical, Monosized Y.sub.2 O.sub.3 Precursor Particles Journal of Colloid & Interface Science, vol. 122 1 Mar. 1988.

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