Method for encapsulating electroluminescent phosphor particles

Details Method for encapsulating electroluminescent phosphor particles Method for encapsulating electroluminescent phosphor particles

1990-04-25

1992-10-20

Bell, Janyce

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 66, 4271262, 427212, 427215, 427226, 4272553, 4272556, C23C 1600, C23C 1644

Patent

active

051568853

ABSTRACT:
Encapsulated 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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Thornton, Electroluminescence Maintenance, Jour. of Electrochem. Soc., pp. 895-907, vol. 107, No. 11, Nov. 1960.
Air Force Technical Report AFFDL-TR-68-103, Thompson et al., Jul., 1968 (relevant portions, pp. 1-10, 15-21, 42, 43, 47, 52 and 54).

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