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Published in:
01-05-2008
Luminescent properties of nanoparticles LaSrAl3O7:RE3+ (RE = Eu, Tb) via the citrate sol–gel method
Published in: Journal of Materials Science: Materials in Electronics | Issue 5/2008
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Abstract
Phosphors of nanoparticles LaSrAl3O7:RE3+ (RE = Eu, Tb) have been prepared by a sol–gel method. The structure and luminescent properties of LaSrAl3O7:Eu3+ and LaSrAl3O7:Tb3+ phosphors were characterized by X-Ray diffraction (XRD) and atomic force microscopy (AFM), photoluminescence excitation and emission spectra were utilized. From XRD patterns, it is indicated that the phosphor LaSrAl3O7 forms without impurity phase at 900 °C. From AFM images, it is shown that the crystal size of the phosphors are about 60–80 nm. Upon excitation with ultraviolet (UV) irradiation, it is shown that there is a strong emission at around 617 nm corresponding to the forced electric dipole 5D0–7F2 transition of Eu3+, and at around 543 nm corresponding to the 5D4–7F5 transition of Tb3+. The dependence of photoluminescence intensity on Eu3+ (or Tb3+) concentration and annealing temperature were also studied in detail.