CTAB-assisted hydrothermal synthesis and luminescence properties of BiPO_4:Eu~(3+) phosphors

摘要

Bi_(0.95)PO_4:0.05Eu~(3+) phosphors with different structures and morphologies were prepared by a CTAB-assisted hydrothermal method. X-ray diffraction (XRD), scanning electron microscopy (SEM) and photolumines-cence (PL) spectrometer were carried out to characterize the samples. The results showed that the amounts of CTAB and the pH values of the precursor solution had a great influence on the structure, morphology and luminescence intensity of the obtained samples. XRD results showed that a structural change from low temperature monoclinic phase (LTMP) to hexagonal phase (HP) happens with increasing the pH values and the amounts of CTAB. Some morphologies changes from octahedron-like to microrods and nano particles could be observed in SEM images. When the amount of CTAB was 2 mmol, the sample showed the highest luminescence intensity at pH = 0.5. Under 395 nm excitation, BiPO_4:Eu~(3+) phosphors displayed red emission centered at 595 nm which corresponded to the ~5D_0→~7F_1 transition of Eu~(3+) ions. The BiPO_4:Eu~(3+) phosphors synthesized by the CTAB-assisted hydrothermal method could be a promising phosphors which emits red light for white LEDs.