Enhanced photoluminescence and charge density studies of novel (Sm_(1-x) Gd_x)_2O_3 nanophosphors for WLED applications

摘要

Pure Sm2O3 and Gd3+ doped Sm2O3 nanocrystalline powders were synthesized using the combustion method. The structural analysis from the Powder X-ray Diffraction revealed that pure and Gd3+ doped -Sm2O3 nanocrystals of cubic phase with Ia < overline > 3 as the space group were produced. The High Resolution Transmission Electron Microscopy results confirmed that monodisperse nanocrystals having spherical shape were formed. The results of the Energy-Dispersive X-ray analysis confirmed that the samples were free from impurities. The UV-Vis-IR absorption and photoluminescence studies, carried out to study their optical properties, showed that these materials could be used for solid state lighting devices, particularly for UV-UV (near-ultraviolet) excited white light-emitting diodes. The charge density and photoluminescent behaviour in the chosen system were correlated using the MEM/ Rietveld analysis.