Photoluminescence studies of Eu3+ and Tb3+ activated Ba2SiO4 phosphor

Abstract

Eu3+ and Tb3+ - activated Ba2SiO4 phosphors have been synthesized by using high temperature conventional solid state reaction method. All synthesized phosphors are characterized by X-ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS), Scanning Electron Microscope (SEM), Fourier-Transform Infrared Spectroscopy (FTIR) and Photoluminescence Techniques (PL). The X-ray diffraction patterns of the sample are indexed as orthorhombic structure. Elements are present in the composition are Ba, Si, O, Eu and Tb as confirmed from EDS. In the photoluminescence studies, Ba2SiO4: Eu3+ phosphor exhibits strong emission peak at 611 nm and Ba2SiO4: Tb3+ phosphor exhibits high intense emission peak at 546 nm under UV excitations. These peaks may be attributed to the transition 5D0 → 7F2 of Eu3+ ions and transition 5D4 → 7F5 of Tb3+ ions. The intensity of intense peaks are increasing with Eu3+ concentration increases as well as the high intense emission peak is moderated from blue region to green region with Tb3+ concentration increases. The CIE (Commission International de I'Eclairage) color chromaticity diagram confirms that the synthesized phosphors are emitting red and green color. Based on these results, these phosphors may be useful as red and green phosphors in the lamp as well as in the display devices.