Enhanced luminescence properties of MgTO3:Mn4+ red-emitting phosphor by adding Ge4+ ion and H3BO3

Abstract

A series of MgTiO3:Mn4+, MgTiO3:Mn4+, Ge4+, and MgTiO3:Mn4+, B3+ phosphors are prepared by the high temperature solid-state reaction method in air. X-ray powder diffraction (XRD) patterns confirm that there is only pure phase in all samples. The samples are composed of microparticles with irregular shapes. Their excitation spectra monitored at 658 nm may be observed in the range of 200–600 nm and their emission spectra with excitation at 330 nm cover the region from 600 to 800 nm due to the 2E → 4A2 transition of Mn4+ ion. The chromaticity coordinate is (0.7233, 0.2767). The optimal Mn4+ content is ~ 0.3% in MgTiO3:Mn4+ phosphor. The luminescence intensity and quantum efficiency of MgTiO3:Mn4+ phosphor may be obviously improved by adding Ge4+ ion and H3BO3. The experimental results are helpful for the luminescence property improvement of other Mn4+ doped materials.