Method of removing impurities from a SrB 4 O 7 :Eu phosphor

Details Method of removing impurities from a SrB 4 O 7 :Eu phosphor Method of removing impurities from a SrB 4 O 7 :Eu phosphor

2007-06-19

2007-06-19

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

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

Reexamination Certificate

active

10907040

ABSTRACT:
An acidic solution can be used to dissolve undesirable impurity phases in UV-emitting SrB4O7:Eu phosphors that reduce the UV emission intensity of said phosphor. In particular, the impurity phase, SrB6O10:Eu, is no longer detected after treating the phosphor with an acid washing process. The phosphors after acid washing are shown to have improved UV emission intensity without greatly increasing the mean particle size.

REFERENCES:
patent: 4719033 (1988-01-01), Chenot et al.
patent: 5068055 (1991-11-01), Chenot et al.
patent: 5378398 (1995-01-01), Kasenga et al.

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