Red-Shifted Emission in Y3MgSiAl3O12:Ce3+ Garnet Phosphor for Blue Light-Pumped White Light-Emitting Diodes

It is highly desirable to red shift the emission of Y3Al5O12:Ce3+ phosphor to obtain a warmer correlated color temperature (CCT) in applications for blue-light pumped white-light emitting diodes (w-LEDs) with high color rendering index (CRI). In this paper, we report the red-shifted emission of Y3MgSiAl3O12:Ce3+ garnet phosphor for w-LEDs through a chemical unit cosubstituting in a solid solution design strategy. The fabrication temperature of the Y3MgSiAl3O12:Ce3+ powder was optimized at 1600 °C, and its structure, photoluminescence property, micromorphology, decay curve, quantum yield, as well as the thermal stability of the samples are investigated in detail. The as-prepared Y3MgSiAl3O12:Ce3+ phosphors display a broad excitation band ranging from 300 to 520 nm (centered at 450 nm) and present an intense Ce3+ 5d–4f emission band in the yellow light region (λem = 564 nm, obviously red-shifted away from Y3Al5O12:Ce3+). This can be explained by the increase of the crystal-field splitting in the Ce3+ 5d lev...