The optical spectra of samples of double zirconium molybdates activated by rare-earth Pr^3+ and Nd^3+ ions are studied. The presence of bands corresponding to the 4 f –4 f transitions of Pr^3+ and Nd^3+ trivalent ions in the absorption, excitation, and luminescence spectra is shown. A strong dependence of the luminescence intensity of Pr^3+ ions on temperature is revealed.

The article describes the process and parameters of growing CsI:Sm2+ single crystals by the Czochralski method. Spectroscopic studies of the CsI:Sm2+ single crystal have been carried out; it has been established that samarium ions enter the caesium iodide single crystal in the divalent state. At room temperature, luminescence is observed corresponding to the 4f55d1-4f6 transitions of divalent samarium; on cooling, only radiative 4f6-4f6 transitions are observed. The temperature dependence of the luminescence has been measured, the barrier energy has been determined, and the decay times of the luminescence have been measured.