Enhanced Yellow-to-Orange Emission of Si-Doped Mg3Y2Ge3O12 : Ce3 + Garnet Phosphors for Warm White Light-Emitting Diodes

Abstract

A series of Si-doped phosphors were synthesized by a solid-state reaction method. could absorb blue light (400–520 nm) and exhibit a yellow emission band in the wavelength range of 480–750 nm. When 70% Ge in the host lattice is replaced by Si, the crystal field splitting between the two lowest levels is enhanced from 9650 to , and the bandgap of broadens from 5.47 to 5.82 eV. As a result, the emission peak of shifts from 573 to 604 nm, which means that the emission color alters from yellow to orange, and the quantum efficiency of the phosphor is enhanced from 4.5 to 54.3%. The enhanced yellow-to-orange emission of Si-doped makes it a potential conversion phosphor for warm white light-emitting diodes.