Investigation on the Preparation and Properties of Monodispersed Spherical Y sub(2) O sub(3):Dy super(3+) Phosphor

The oxide phosphor (Y sub(1-x) Dy sub(x)) sub(2) O sub(3) (x=0-0.1) was obtained by calcining their respective precursors synthesized by homogeneous precipitation technique using rare earth nitrate as mother salt and urea as precipitating agent. The particle shape/size, fluorescent properties (especially the influence of Dy super(3+) concentration and calcination temperature) of the product was studied in detail. The results showed that the precursors exhibit monodisperse spherical morphology whose size can be controlled by adjusting the urea content. The phase pure (Y sub(1-x) Dy sub(x)) sub(2) O sub(3) can be obtained by calcining precursor at least 600 [degrees]C, and the monodisperse spherical morphology can be kept at even high temperature of 1000 [degrees]C. The (Y sub(1-x) Dy sub(x)) sub(2) O sub(3) phosphors exhibit strong yellow emission at ~577 nm ( super(4) F sub(9/2)[arrowright] super(6) H sub(13/2) transition of Dy super(3+)) and blue emission at ~491 nm ( super(4) F sub(9/2)[arrowright] super(6) H sub(15/2) transition of Dy super(3+)) upon optimal excitation wavelength of ~352 nm. The quenching concentration of Dy super(3+) was determined to be ~2 at% (x=0.02). The emission intensity of (Y sub(1-x) Dy sub(x)) sub(2) O sub(3) phosphors can be improved with the temperature and particle size increasing