Abstract
The red phosphors La 2− x− y Eu x R y Mo 2O 9 ( x = 0.6, y = 0–0.07, R = Gd, Dy, Y and Yb) were prepared by solid-state reactions, and their photoluminescent properties were investigated. Under the excitation of 465 nm blue light, the red emission around 615 nm originating from the 5D 0 → 7F 2 transition of Eu 3+, is obviously shown in these phosphors. After the co-doping of small amounts of rare earth (Gd, Dy, Y and Yb) ions with Eu 3+, the emission intensity of phosphors is effectively enhanced. In particular, the La 1.37Eu 0.6Yb 0.03Mo 2O 9 sample exhibits the strongest emission intensity (about 160% as compared with that of La 1.4Eu 0.6Mo 2O 9 sample) due to the addition of Yb 3+ with relative smaller ionic radius. This is a welcome change for the red phosphor used in white light-emitting diodes.
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