Synthesis and Characterization of Green Emitting Erbium Doped BaY2ZnO5 Nanophosphors

Abstract

In this present era of nanotechnology, rare earth doped nanophosphors in nano dimension marks as thrust area of research owing to its magnificent characteristics like high lumen output, good color rendering index, high thermal stability and magnificent quantum efficiency involved with its unique optical behaviour. Due to the enhanced properties these nanomaterials are widely explored in the display devices like plasma display panels (PDP), field emission displays and light emitting diodes. Among the various RE3+ ions, Er3+doped nanophosphors are widely explored on being the essential green component of the phosphor converted white LEDs because of green emitting luminescent properties. In this series, erbium activated oxide host matrix BaY2ZnO5 have found potential applications for luminescent phosphors on grounds of its magnificent electronic and magnetic properties and greater crystallinity. Erbium doped BaY2ZnO5 nanophosphor was successfully synthesized via sol-gel approach in nano dimension with particle size in 60-80 nm range as confirmed by transmission electron microscopy (TEM). The crystallinity of pure phased nanophosphor in orthorhombic lattice with Pbnm (62) space group was confirmed through X-ray diffraction analysis. On excitation at 380 nm (4I15/2→ 4G11/2 transition) the nanophosphor yields green emission at 549 nm attributed to 4S3/2→4I15/2 transition with optimum concentration for maximum luminescence was 4 mol%.