Method and apparatus for preparing rare earth-activated...

Details Method and apparatus for preparing rare earth-activated... Method and apparatus for preparing rare earth-activated...

2006-12-26

2006-12-26

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

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

Reexamination Certificate

active

07153450

ABSTRACT:
The present invention provides a method and apparatus for preparing a rare earth-activated barium fluorohalide based phosphor, in which atmospheric states during calcining and during cooling can be optimally adjusted and a cooling rate can be selected in a wide range. In the preparing apparatus of the present invention, a mixture18of phosphor materials is calcined by a calcining furnace10to form a calcined product, and thereafter, the calcined product is cooled to thereby prepare a rare earth-activated barium fluorohalide based phosphor. A calcining region12in which the mixture of phosphor materials can be calcined is provided in the calcining furnace10,and a portion of the calcining region12is connected, via a partition door30capable of being opened and closed, to a cooling region28in which the calcined product can be cooled, at an outer side of the calcining furnace10.Further, the method for preparing the rare earth activated barium fluorohalide based phosphor of the present invention is carried out by using the above-described preparing apparatus.

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