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

•Luminescent properties of Mn doped ZnO/Zn2SiO4 composite microphosphor.•Crystal structure analysis of composite phosphor.•Study of defect emission in composite phosphor.•CIE coordinates variation under different Mn2+ ion doping.

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 (∼530 nm) and with 355 nm laser excitation blue emission (∼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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide