Structural characterization and optical properties of Ca2MgSi2O7:Eu(2+),Dy(3+) phosphor by solid-state reaction method

Abstract

Ca2MgSi2O7:Eu(2+),Dy(3+) phosphor was prepared by the solid-state reaction method under a weak reducing atmosphere. The obtained phosphor was characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared (FT-IR) techniques. The phase structure of the Ca2MgSi2O7:Eu(2+),Dy(3+) phosphor was akermanite type, which is a member of the melilite group. The surface morphology of the sintered phosphor was not uniform and phosphors aggregated tightly. EDX and FT-IR spectra confirm the elements present in the Ca2MgSi2O7:Eu(2+),Dy(3+) phosphor. Under UV excitation, a broadband emission spectrum was found. The emission spectra observed in the green region centered at 535 nm, which is due to the 4f-5d transition. The mechanoluminescence (ML) intensity of the prepared phosphor increased linearly with increases in the mechanical load. The ML spectra were similar to the photoluminescence (PL), which indicates that ML is emitted from the same emitting center of Eu(2+) ions as PL.

Keywords: Ca2MgSi2O7:Eu2+; Dy3+; XRD; mechanoluminescence; photoluminescence.