Luminescent spectroscopy and structural properties of Ce~(3+)-doped low-temperature X_1-Y_2SiO_5 material prepared by polymer-assisted sol-gel method

摘要

Cerium (Ce~(3+))-doped monoclinic X_1-Y_2SiO_5 (YSO)-type oxyorthosilicates powders were prepared by monomer and polymer-assisted sol-gel method. The present work aims to study the influence of ethylene glycol (EG) monomer, polyethylene glycol (PEG) polymer and poly vinyl alcohol (PVA) polymer, as fuels and nucleating agents for the crystallization, on structural and luminescence properties of the Ce~(3+) (xCe = 0.01)-doped Y_2SiO_5. The X-ray diffraction technique, field emission scanning electron microscopy, Fourier transform infrared spectroscopy and steady photolu-minescence have been used to characterize the samples. It is found that the types of fuels affect the phase purity and luminescent characteristics of phosphors. All samples exhibit intense violet-blue asymmetric emission band in the range of 370-540 run with a maximum intensity centered at around 420 nm assigned to the 5d → 4f (2F5/2, 2F7/2) interconfig-urational transitions of Ce~(3+) ion in YSO nanomaterial. Finally, the vibronic coupling parameters are estimated and discussed.