Abstract
BaLa2WO7:Tm3+ or Er3+ (BLWO:Tm3+ or Er3+) single doped phosphors were prepared by a citrate-based sol-gel method. The crystalline properties of the prepared blue- and green-emitting phosphor materials were analyzed by X-ray diffraction (XRD) after annealing at 1350°C. The XRD patterns of the both phosphors revealed monoclinic structure with a space group of P21/b. The morphological properties and elemental mappings of the BLWO:0.02Tm3+ and BLWO:0.01Er3+ phosphors were measured by field-emission scanning electron microscope images and energy dispersive X-ray spectrum, respectively. The photoluminescence (PL) spectra of BLWO:Tm3+ phosphors showed characteristic emission peaks of Tm3+ ions from the visible blue to near-infrared regions with the dominant emission at 799nm (3H4→3H6) under ultraviolet (UV) and near-UV excitation wavelengths. Similarly, Er3+ ions activated BLWO phosphors exhibited intense green emissions at 548nm (4S3/2→4I15/2) under the characteristic excitation wavelength of 381nm. Furthermore, the temperature-dependent PL emission spectra and the luminescence decay curves were measured for the optimized BLWO:0.02Tm3+ and BLWO:0.01Er3+ phosphors. The chromaticity coordinates for the optimized blue- and green-emitting phosphors were calculated.
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