VUV-photoluminescence Properties of (Gd, La)2O2CO3: Eu3+

(Gd,La)(2-x)O2CO3:Eu-x(3+)(0.01 <= x <= 0.04) were synthesized via a flux method at 400 degrees C, and their photoluminescence properties under vacuum ultraviolet (VUV) excitation were examined. The excitation spectra showed two bands in the region from 125 nm to 300 nm, the first band centered at 190 nm was ascribed to absorption of related CO32- complex, and the second broad band centered at 246nm and 278nm in Gd2O2CO3:Eu3+ was ascribed to the charge transfer band of O2- -> Eu3+. Series samples exhibited red emission at around 611 nm under vacuum ultraviolet excitation corresponding to the D-5(0) -> F-7(2). transition of Eu3+.