Effect of Dy³⁺ Amount on the Structural and Luminescence Properties of LaNbO₄:Dy³⁺ Phosphor Obtained by One-Step Spray Pyrolysis Process

In this study, Dy³⁺-doped LaNbO₄ phosphors with a blue to white emission that can be tuned by varying the activator concentration were prepared by one-step spray pyrolysis process. According to the powder X-ray diffraction results, increasing Dy³⁺ concentration favored the tetragonal phase. Slight changes were observed in the recorded Raman spectra as a function of Dy³⁺ concentrations while SEM (scanning electron microscopy) micrographs presented similar profiles regardless the Dy³⁺ amount. Investigation of Dy³⁺ emission data in the visible range showed that rising the Dy³⁺ concentration progressively shifted the emission towards the white color. All samples presented a wide excitation range from 254 to 475 nm.

Keywords:
spray pyrolysis; luminescence; lanthanum niobate