Syntheses and Luminescent Properties of ika1-xLnxj2O2CN2iLn=Pr,Sm,Eu,Tbj
Masao TAKAHASHI, Yasuhiro HASHIMOTO, Shinichi KIKKAWA and Hikaru KOBAYASH
Abstract:Several rare earth doped lanthunum 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 9 keV 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. Key Words:Lanthanum dioxymonocyanamide, Luminescence, Fluorescence, Phosphor, Crystal structure