(La_1-xLn_x)₂O₂CN₂(Ln=Pr, Sm, Eu, Tb)の合成と蛍光特性

抄録

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 (La_1-xEu_x)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.