Anisotropic fundamental optical absorption bands have been found at 4.4 eV in K2AgI3 and Rb2AgI3, and at 4.9 eV in Rb2AgBr3. The X-ray photoelectron spectrum of Rb2AgI3 indicates that the uppermost valence band is the p-band of halogen. Optical absorption spectra are interpreted in terms of transitions of the charge transfer type from the halogen to the silver ion. The photo-excitation in the fundamental absorption region have been observed to induce luminescence and a radiation damage effect at low temperature.
ASJC Scopus subject areas
- Physics and Astronomy(all)