(Ca,Sr)3Al2O6:Ce3+荧光粉的合成与发光性质研究

In this paper, a series of Ca3-xSr3Al2O6:Ce3+ phosphors were synthesized by a tranditional solid-state reaction and the corresponding structure, photoluminescent excitation and emission spectra were studied. The diffraction peaks of the XRD patterns shift to low angles with the increase of Sr2+ content, while the profile of peaks stays unchanges, which implies that the introduction of Sr2+ results in the increase of unit cell without the change of crystal structure. Phosphors exhibit an emission (PL) band peaking at 470 nm under excitation at 305 nm, and the corresponding PL intensity decrease with the increase of Sr2+ content. On the other hand, when excited at 365 nm, the PL band shifts from ~420 nm to ~470 nm with the increase of Sr2+ content, which has a highest intensity when Sr2+ content (x) is 0.5. Furthermore, an additional excitation band appears when Sr2+ exists, and the related PL band is at 500 nm. The relationship between luminescent properties and crystallographic site for Ce3+ ions are studied in detail.