New aluminate-germanate hosts with garnet structure for solid state lighting applications

In this paper, two newly developed garnet phosphors, BaY2Al4GeO12:Ce3+ and SrY2Al4GeO12:Ce3+ are reported. The materials were prepared by simple, facile combustion synthesis. The emission for these phosphors is in yellow region when excited by blue light. Decay for BaY2Al4GeO12:Ce3+ is nearly exponential with average lifetime of 70 ns. In case of SrY2Al4GeO12:Ce3+, decay curve could be fitted to second order exponential with fast component τ1 = 24.5 ns and slow component τ2 = 57 ns. Capability of excitation by blue LED, yellow emission, simple preparation make these phosphors suitable for white LED lamp fabrication. These could be suitable replacements for YAG:Ce.