Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1992-04-02
1996-06-11
Bonner, Melissa
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C09K 1178
Patent
active
055252591
ABSTRACT:
Disclosed is a large size Y.sub.2 O.sub.3 :Eu lamp phosphor as a red component for a water degradation resistant blend of fluorescent phosphors having large sized green phosphor particles and the method for making by blending yttrium oxide and europium oxide with fluxing agents, firing, milling the fired phosphor; sieving the milled phosphor to obtain a phosphor with an average particle size greater than about 5 by Coulter Counter to produce a sieved phosphor, and encapsulated a conformal coating of gamma alumina on said sieved phosphor by vapor chemical vapor deposition to form a resulting coated Y.sub.2 O.sub.3 :Eu phosphor with additional phosphor components including a green phosphor to form a lamp phosphor blend, and applying the blend to a lamp as a water based suspension.
REFERENCES:
patent: 3574131 (1971-04-01), Ferri et al.
patent: 3870650 (1975-03-01), Ferri et al.
patent: 4473518 (1984-09-01), Minagawa et al.
patent: 4585673 (1986-04-01), Sigai
patent: 4801398 (1989-01-01), Ohno et al.
Gingerich Richard G. W.
Morse James
Munn Robin W.
Bonner Melissa
Clark Robert F.
GTE Products Corporation
Levy Elizabeth A.
Walter Robert E.
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