Method of preparing small particle size phosphors

Details Method of preparing small particle size phosphors Method of preparing small particle size phosphors

1994-07-01

2000-10-17

Koslow, C. Melissa

Compositions

Inorganic luminescent compositions

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

C09K 1184

Patent

active

061326429

ABSTRACT:
A process for preparing phosphor particles having a particle size of 1 micron or less and that are spherical in shape. Such phosphors are useful, for example, as upconverter phosphors in labels for immunoassays. The process comprises preparing a dilute solution of soluble salts of the rare earth metals in amounts required to make the desired phosphor, adding a chemical agent that releases hydroxyl ions, precipitating small spherical particles of a rare earth hydroxycarbonate compound, heating the particles in oxygen at a limited temperature to form the corresponding trioxide particles, and heating the trioxide particles in a sulfur-containing flux in the absence of oxygen at a temperature no higher than about 900.degree. C. to convert the trioxide particles to the corresponding oxysulfide phosphor particles.

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Beverloo et al, "Preparation and Microscopic Visualization of Multicolor Luminescent Immunophosphors", Cytometry 11:661-670 (1992).
Beverloo et al, "A Comparison of the Detection Sensitivity of Lymphosyte Membrane Antigens Using Fluorescein and Phosphor Immunoconjugates", J. Histochemistry & Cytochemistry, 41 No. 5 )1993) pp. 719-725.
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