The influence of Ag~(9+) ion irradiation on the structural, optical and luminescence properties of Sm~(3+) doped NaSrBO_3: Stability of color emission

摘要

This paper reports on the effect of 120 MeV Ag~(9+) ion irradiation on the structure, optical and luminescence properties of NaSr_(1-x)BO_3: xSm~(3+) (x = 0.5-2.5 mol.%) phosphor, synthesized by the solid state reaction and combustion method. The samples were irradiated with Ag~(9+) swift heavy ions (SHIs) using fluences of 1 × 10~(12) ions cm~(-2), 5 × 10~(12) ions cm~(-2) and 1 × 10~(13) ions cm~(-2). The as-prepared as well as irradiated samples were characterized by X-ray diffraction (XRD), diffuse reflectance (DR) and photoluminescence (PL) techniques. After irradiation, the structure of the phosphor did not change except that the loss of crystallinity which may be due to the fragmentation caused by the SHI. DR spectra reflect a blue shift in the absorption band with increasing fiuences, for phosphors prepared using both solid state reaction and combustion method, resulting in an increase in the band gap from 5.64 to 6.06 eV. The PL intensity of the phosphors was enhanced with an increase in ion fiuences, with the samples prepared using a combustion method exhibiting prominent intensity. The C1E coordinates were calculated and they correspond to the shade of orange-red emission of the Sm~(3+) ions.