Abstract:
New stannate pyrochlore based red emitting
phosphor materials: CaLa1-xSnNbO7: xEu3? were prepared by the conventional solid state route and characterized by Powder X-ray diffractometer, scanning electron
microscope and fluorescence measurements. Optimization studies by way of varying the calcination temperatures show that CaLaSnNbO7: Eu3? prepared at 1,400 C displayed the maximum luminescence characteristics. The dominant emission peak of CaLaSnNbO7: xEu3? phosphor is 5D0 ? 7F2 forced hypersensitive electric dipole transition which indicates the deviation of pyrochlore A-site from inversion symmetry. The present quaternary pyrochlore
phosphors show strong red luminescence (*612 nm)under near UV (394 nm) and blue light (465 nm)excitations
