Preparation, structural and luminescent properties of YAl_3(BO_3)4:Dy~(3+) phosphor for white light-emission under UV excitation

摘要

A series of YAl_3(BO_3)_4 phosphors doped with different concentrations of Dy_2O_3 (0.1 ≤x≤5mol%) were prepared by solid-state reaction method. The crystallization process of the precursor has been examined by differential thermal analysis (DTA) measurements. The phase purity and surface morphological features were characterized by X-ray diffraction (XRD) and scanning electron microscopic (SEM) investigations. The YAl_3(BO_3)_4 nanocrystals obtained were found to be about 45 nm in size and have the trigonal structure with some agglomeration. Fourier transform infrared (FTIR) and energy dispersive X-ray spectra (EDS) measurements were carried out to understand the compositional and elemental analysis. The characteristics emission peaks of Dy~(3+) ion corresponding to the transitions of ~4F_(9/2)->~6H_(15/2) at 485 nm and ~4F_(9/2)->~6H_(13/2) at 576 nm were observed in the emission spectra. The luminescence quenching noticed at higher Dy_2O_3 concentrations is due to the exchange interaction among the excited Dy~(3+) ions.