Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1977-08-19
1978-03-21
Cooper, Jack
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C09K 1146
Patent
active
040803066
ABSTRACT:
A process for preparing BaFCl:Eu phosphors of controllable particle size and size distribution is provided. The process comprises (a) preparing an intimate mixture of fine particles of BaFCl, a europium source, preferably water-soluble EuCl.sub.3, and a water-soluble chloride as flux; (b) firing the mixture in an inert atmosphere at a temperature in the range of about 550.degree.-900.degree. C and above the liquid temperature of the flux for a time sufficient to effect reaction and diffusion, and (c) washing the fired product with water to remove the chloride flux. By preselecting the combination of firing temperature and flux concentration in the mixture, phosphor particles of a predetermined size and size distribution can be obtained. This control of the phosphor product is especially advantageous when the intimate mixture is formed in an aqueous medium.
REFERENCES:
patent: 2303917 (1942-12-01), Dietz
patent: 2303963 (1942-12-01), Uhle
patent: 3951848 (1976-04-01), Wolfe et al.
patent: 3988252 (1976-10-01), Ferretti
Stevels "Philips Research Reports", vol. 30, No. 5, Oct. 1975, pp. 277-290.
Leverenz "An Introduction to Lumini of Solids", John Wiley & Sons, 1950, pp. 78-79.
Cooper Jack
E. I. Du Pont de Nemours and Company
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