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Optical Properties of MgMoO4:Dy3+,Eu3+ Phosphors Prepared with Different Eu3+ Molar Ratios
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 Title & Authors
Optical Properties of MgMoO4:Dy3+,Eu3+ Phosphors Prepared with Different Eu3+ Molar Ratios
Kim, Jung Dae; Cho, Shinho;
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The effects of doping on the structural, morphological, and optical properties of phosphors prepared by solid-state reaction technique were investigated. XRD patterns exhibited that all the synthesized phosphors showed a monoclinic system with a dominant (220) diffraction peak, irrespective of the content of ions. The surface morphology of phosphors was studied using scanning electron microscopy and the grains showed a tendency to agglomerate as the content of ions increased. The excitation spectra of the phosphor powders were composed of a strong charge transfer band centered at 294 nm in the range of 230~340 nm and two intense peaks at 354 and 389 nm, respectively, arising from the and transitions of ions. The emission spectra of the :10 mol% phosphors without incorporating ions revealed a strong yellow band centered at 573 nm resulting from the transition of . As the content of was increased, the intensity of the yellow emission was gradually decreased, while that of red emission band located at 614 nm began to appear, approached a maximum value at 10 mol%, and then decreased at 15 mol% of . These results indicated that white light emission could be achieved by controlling the contents of the and ions incorporated into the host crystal.
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