Tunable Luminescence Properties of Tb3 + -Doped LaGaO3 Nanocrystalline Phosphors

Abstract

Nanocyrstalline -doped phosphors were prepared through a Pechini-type sol-gel process. X-ray diffraction, field-emission scanning electron microscopy (FESEM), photoluminescence, cathodoluminescence spectra, and lifetimes were utilized to characterize the synthesized phosphors. XRD results reveal that the sample begins to crystallize at and pure phase can be obtained at . FESEM images indicate that the -doped phosphors are composed of aggregated spherical particles with sizes ranging from 40 to . Under the excitation of ultraviolet light and low-voltage electron beams , the -doped phosphors show the characteristic emissions from the host lattice and the ( transitions). The emission colors of -doped phosphors can be tuned from blue to green by changing the excitation wavelength of ultraviolet light and the doping concentration of to some extent. Relevant luminescence mechanisms are discussed.