Abstract

Photochromic materials have the property of changing color under light illumination. Inorganic photochromic materials are frequently cathodochromic as well, that is, they can be colored by electron beam irradiation. This paper describes recent studies at RCA Laboratories of three classes of inorganic photochromic materials: (1) rare-earth-doped CaF2; (2) transition-metal-doped SrTiO3 and CaTiO3; and (3) iron- or sulfur-doped sodalite. Photochromic properties of these materials in both single crystal and powder form, and cathodochromic properties of powders, are discussed.

© 1970 Optical Society of America

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