Abstract
Several rare earth doped lanthanum dioxymonocyanamide phosphors have been prepared by calcining mixture of La2O3 and rare-earth oxide powders under flowing ammonia gas in the existence of carbon. Incorporated rare earth ions worked as a luminescence center. Colors of the luminescence of these phosphors irradiated by the monochromatized x-ray of 9keV were pale blue, reddish purple, red and green for Pr, Sm, Eu and Tb, respectively. For optical luminescence spectra measured for (La1-xEux)2O2CN2 at room temperature, the relation between the fluorescence intensity and Eu content, x was discussed with the solid solution limit of Eu to La2O2CN2, estimated by the XRD and XANES analyses.
