Abstract
This study is focused on the synthesis condition influence related to structural and spectroscopic properties of the potassium strontium pyrophosphate (K_2SrP_2O_7) co-doped with Eu~(3+) and Eu~(2+) ions. The experimental parameters of the urea assisted combustion synthesis were optimized by temperature and time of calcination as well as reduction atmosphere composition. The obtained materials were structurally characterized using the X-Ray Powder Diffraction (XRPD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Spectroscopic properties were determined by emission spectra, excitation spectra, luminescence kinetics and luminescence temperature quenching measurements. It was found that increasing concentration of Eu~(3+) ions caused an increase of spectroscopic factors, which correspond to the relative integrated luminescence intensities of ~5D_0-~7F_∫ transitions as well as structural defects. Moreover, the successful Eu~(2+) ion incorporation was proven by optical spectroscopic measurements, which showed the allowed f-d transitions.
NSTL
Elsevier