Anisotropy of optical absorption and luminescent properties of CaMoO4

Optical absorption, excitation and emission spectra, as well as photoluminescence decay time of CaMoO4 single crystals have been measured. It has been revealed that annealing of crystals in oxygen atmosphere leads to the disappearance of their anisotropic behavior in optical absorption, as well as in X-ray luminescence and decay time. Moreover, it has been found that annealing can significantly affect the value of the decay time. The relative intensity of the long-wavelength emission band increases under excitation in the region of indirect band-to-band transitions.