ABSORPTION AND LUMINESCENCE OF PHOTOCHROMIC CdI//2: CuI.

Article abstract of DOI:10.1016/0022-4596(88)90011-4

The irradiation with ultraviolet light of CdI//2 containing 1-5 mole% CuI induces new absorption bands in the visible part of the spectrum. The absorption spectra of uncolored, optically colored, and thermally bleached CdI//2:CuI are presented and discussed. The optical coloration is due to the photoneutralization of Cu** plus ions in CdI//2, and the thermal bleaching is due to thermal ionization of Cu atoms. During the coloration process small microcrystals of metallic Cu are formed in the CdI//2 single crystals. Uncolored CdI//2:CuI shows luminescence similar to CdI//2. Optically colored CdI//2:CuI does not show luminescence, due to the presence of optically induced luminescence killing centers.