Synthesis, structural and luminescence properties of Mn doped ZnO/Zn2SiO4 composite microphosphor

Manganese doped ZnO/Zn2SiO4 (MZS) composite phosphors were successfully prepared by conventional solid state reaction method. The structural and optical properties of as-prepared samples were analysed by means of XRD, SEM, PLE and PL. The result shows that the samples consist of both ZnO and ZnSiO4 phases which confirms the composite phosphor. The strain acting on the phosphor is found to be in the range of 0.0040-0.0058 for different concentration of Mn2+ doping. The doping of Mn2+ significantly influences the optical properties of phosphor. Under 266 nm laser excitation samples show green emission (similar to 530 nm) and with 355 nm laser excitation blue emission (similar to 441 nm) is shown. The enhancement of luminescence intensity is achieved with Mn2+ doping up to an optimum concentration (10 at.%) and then decreases. On 266 nm excitation, blue emission intensity decreases with Mn2+ doping. This composite phosphor shows both blue and green emission under different excitations. (C) 2014 Elsevier B.V. All rights reserved.