Abstract
A new Dy3+ activated Ba7(BO3)3(SiO4)Cl phosphor with complex anionic groups was synthesized by the high temperature solid state reaction technique. The X-ray powder diffraction analysis showed that the phosphors crystallized in polar space group P63mc of the hexagonal system. The excitation and emission spectra, decay curves and chromaticity coordinates were characterized to investigate the photoluminescence properties. The Ba7(BO3)3(SiO4)Cl:Dy3+ phosphors could be effectively excited by UV–visible light from 280 to 500 nm. The emission spectra exhibited three emission bands peaking at 480 (blue light), 576 (yellow light) and 665 nm (red light), which were due to the 4F9/2-6H15/2, 4F9/2-6H13/2 and 4F9/2-6H11/2 transitions of Dy3+, respectively. When Dy3+ concentration exceeded 12 mol%, the concentration quenching occurred. The critical distance between Dy3+ ions was calculated to be about 9.22 Å. In addition, the chromaticity coordinates of the phosphor are (0.33, 0.37), and the point is in the white region.
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