Insight into the Photoluminescence of Ba2Cd(BO3)2 : RE3+(RE = Dy, Tb) Phosphors
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Dy 3+ and Tb 3+ ions doped Ba 2 Cd(BO 3 ) 2 phosphors with varying concentrations (2, 3, 4, 5, 6 mol%) were produced via the solid-state synthesis method in air. The as-synthesized phosphors were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), photoluminescence excitation (PLE), and photoluminescence (PL) spectra. The PL and PLE spectra of 2, 3, 4, 5, and 6 mol% Dy 3+ ions doped Ba 2 Cd(BO 3 ) 2 phosphors exhibit four emission bands in blue, yellow, and red regions. The intensity of the emission band resulting from the electric dipole transition ( 4 F 9/2 → 6 H 13/2 ) at 575 nm is higher than the intensity of the emission band resulting from the magnetic dipole transition ( 4 F 9/2 → 6 H 15/2 ) at 481 nm. Because concentration quenching occurs, the optimum doping ratio for Dy 3+ ions doped Ba 2 Cd(BO 3 ) 2 phosphors is 5 mol%. The excitation and emission spectra show that the 2, 3, 4, 5, and 6 mol% Tb 3+ ions doped Ba 2 Cd(BO 3 ) 2 materials capture the excitation energy at about 225 nm and have emission bands at 415, 436, 488, 544, 586, and 621 nm corresponding to 5 D 3 → 7 F 5 , 5 D 3 → 7 F 4 , 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 transitions, respectively.
