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Photoluminescence and Concentration Quenching Properties of BaMoO4:Tb3+ Phosphors
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 Title & Authors
Photoluminescence and Concentration Quenching Properties of BaMoO4:Tb3+ Phosphors
Cho, Shinho; Kim, Jindae; Hwang, Donghyun; Cho, Seon-Woog;
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phosphor powders were synthesized with different concentrations of ions using the solid-state reaction method. XRD patterns showed that all the phosphors, irrespective of the concentration of ions, had tetragonal systems with two main (112) and (004) diffraction peaks. The excitation spectra of the -doped phosphors consisted of an intense broad band centered at 290 nm in the range of 230-330 nm and two weak bands. The former broad band corresponded to the transition of ions; the latter two weak bands were ascribed to the (471 nm) and (492 nm) transitions of . The main emission band, when excited at 290 nm, showed a strong green band at 550 nm arising from the transition of ions. As the concentration of increased from 1 to 10 mol%, the intensities of all the emission lines gradually increased, approached maxima at 10 mol% of ions, and then showed a decreasing tendency with further increase in the ions due to the concentration quenching effect. The critical distance between neighboring ions for concentration quenching was calculated and found to be , which indicates that dipole-dipole interaction was the main mechanism for the concentration quenching of the transition of in the phosphors.
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