Coating processes – Particles – flakes – or granules coated or encapsulated
Patent
1994-07-14
1995-08-08
Beck, Shrive
Coating processes
Particles, flakes, or granules coated or encapsulated
427 66, 427 70, 4271262, 427215, 427226, 4272553, 4272556, B05D 700
Patent
active
054397057
ABSTRACT:
Encapusalated electroluminescent phosphor particles and method for making same. The phosphor particles are encapsulated in a very thin oxide layer to protect them from aging due to moisture intrusion. The particles are encapsulated via a vapor phase hydrolysis reaction of oxide precursor materials at a temperature of between about 25.degree. C. and about 170.degree. C., preferably between about 100.degree. C. and about 150.degree. C. The resultant encapsulated particles exhibit a surprising combination of high initial luminescent brightness and high resistance to humidity-accelerated brightness decay.
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Beck Shrive
Griswold Gary L.
Kirn Walter N.
Maiorana David M.
Minnesota Mining and Manufacturing Company
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