Garnet type Y2Mg3Ge3O12: Dy3+/Eu3+ phosphors excited near ultraviolet: Luminescence properties and energy transfer mechanisms

A battery of Dy3+ single-doped and Dy3+/Eu3+ co-doped Y2Mg3Ge3O12 phosphors were manufactured by hightemperature solid-phase method. The XRD patterns were tested and Rietveld refined. When the samples were excited by 352 nm near ultraviolet light, the energy transfer efficiency can reach 83.2%, and the energy transfer mechanism is electric dipole-electric dipole interaction. The thermal stability of Y1.75Mg3Ge3O12:0.05Dy(3+), 0.2Eu(3+) was tested. When the temperature reached 150 degrees C, its luminous intensity droped to 92.4% of the initial temperature (30 degrees C). By changing the concentrations of Eu3+, white light with red light can be obtained. The above results indicate that these samples are expected to become candidate materials in the domain of solid-state lighting.