Enhanced luminescence in SrMgAlxO17±δ:yMn4+ composite phosphors

Red-emitting SrMgAl x O 17±δ : y Mn 4+ composite phosphors ( x   =   10–100; y   =   0.05–4.0   mol%) are synthesized by solid-state reaction method in air. Addition of Al 2 O 3 leads to the formation of two concomitant phases, i.e., SrMgAl 10 O 17 and Al 2 O 3 phases in the composite phosphor. Red emission from Mn 4+ ions in the composite phosphors is greatly enhanced due to multiple scattering and absorption of excitation light between SrMgAl 10 O 17 and Al 2 O 3 phases. SrMgAl x O 17±δ : y Mn 4+ composite phosphors would be a promising candidate as red phosphor in the application of a 397   nm near UV-based W-LED.