Method of detecting a degraded phosphor in a lamp phosphor suspe

Details Method of detecting a degraded phosphor in a lamp phosphor suspe Method of detecting a degraded phosphor in a lamp phosphor suspe

1990-12-21

1992-12-01

Beck, Shrive

Coating processes

Measuring, testing, or indicating

427 67, 427 68, 427595, 313485, B05D 512, B05D 506

Patent

active

051679825

ABSTRACT:
A an europium doped yttrium oxide red phosphor in a water base phosphor coating suspension is checked for degraded phosphor by (a) centrifuging the suspension, (b) separating an aqueous portion from a solids portion, (c) exposing a surface portion of said solids to UV radiation at 254 nm or 365 nm, (d) observing the presence or absence of fluorescence from said top layer of solids wherein the absence of fluorescence is indicative of a degraded phosphor.

REFERENCES:
patent: 3833398 (1974-09-01), Schreurs
patent: 3999993 (1976-12-01), Patel et al.
patent: 4121132 (1978-10-01), Repsher
patent: 4148935 (1979-04-01), Schreurs
patent: 4219587 (1980-08-01), Oba et al.
patent: 4803400 (1989-02-01), Peters et al.
Kotrly and Sucho, Handbook of Chemical Equilibria in Analytical Chemistry, Ellis Horwood, 1985.

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