Luminescent materials with increased humidity stability

Details Luminescent materials with increased humidity stability Luminescent materials with increased humidity stability

1980-05-16

1982-03-02

Edmundson, F.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

25230145, 2523014H, G01N 2164, C09K 1124, C09K 1146

Patent

active

043180019

ABSTRACT:
Luminescent crystals of the activated rare-earth oxybromide type are coated with a layer of a double salt metal lanthanum sulfate, such as aluminum-lanthanum sulfate or an alkali-lanthanum sulfate, so as to stabilize the resultant luminescent material against humidity without adversely effecting the luminescence capability of such material. The humidity-stabilized luminescent materials of the invention are useful in luminescent coatings or the like employed in medical x-ray diagnoses for intensification of radiation effects on radiographic exposure films. Such intensification coatings generally are incorporated within x-ray intensifier foils.

REFERENCES:
patent: 4105909 (1978-08-01), Ignasiak
patent: 4180740 (1979-12-01), Suys et al.

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