Europium-activated alkaline earth fluorohalide x-ray phosphors a

Details Europium-activated alkaline earth fluorohalide x-ray phosphors a Europium-activated alkaline earth fluorohalide x-ray phosphors a

1976-06-21

1978-07-11

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1146

Patent

active

041001010

ABSTRACT:
In europium-activated alkaline earth fluorohalide x-ray phosphors, the brightness is improved by having a detectable amount of the europium activator in the trivalent state. This beneficial effect is achieved by using a non-reducing firing atmosphere during synthesis for a sufficient time to produce an amount of trivalent europium that is detectable by exciting a sample of the phosphor after firing with 254 nanometer excitation.

REFERENCES:
patent: 3951848 (1976-04-01), Wolfe et al.
patent: 3988252 (1976-10-01), Ferretti
Tanaka et al., "Chem. Abstracts," vol. 80, 1974, 102216u.

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