Preparation, characterization, and luminescence properties of BiLaWO6:Eu3+ red-emitting phosphors for w-LEDs.Spectrochim Acta A Mol Biomol Spectrosc 2019; 224:117454SA
Eu3+-doped bismuth lanthanum tungstate BiLaWO6 phosphors were synthesized for the first time by a conventional solid-state reaction at 1273K. By powder X-ray diffraction (XRD), the crystal structure of the phosphor was verified, which revealed its single-phase structure. Under the 467nm wavelength excitation, the Eu3+-doped BiLaWO6 phosphor powders showed red emission (617nm) that was ascribed to the 5D0→7F2 transitions of Eu3+. The effects of concentration on luminescence properties indicated that the optimal doping concentration was x=0.50mol. The thermal stability by the emission intensities at various temperatures was verified, and the activation energy (Ea) was approximately 0.29eV. The luminescence lifetime was analyzed by the decay curve. The chromaticity coordinates of BiLaWO6:0.50Eu3+ were x=0.650, y=0.347, which had a high color purity at 99.2%. The phosphors had potential application for white light-emitting diodes.