The effect of oxygen-containing anions on luminescent properties of CsI

Abstract

Abstract. It has been found that from the series of oxygen-containing impurities CO32–, SO42–, HCO3–, OH–, IO3–, NO3–, NO2–, CNO–, BO2– only the bivalent ions stimulate an intensive blue luminescence in CsI crystals at UV- or gamma-excitation. The blue luminescence intensity is higher in CsI(CO3) than in CsI(SO4) crystals. The nature of blue luminescence components has been considered and two types of centres have been suggested: the impurity type – CO32–-Va+ (395 nm) and the structural one – Va+-Vc– (435 nm). A method of deep purification of the melt from oxygen-containing anions during the growth process has been proposed.