Abstract
Different concentrations of neodymium (Nd3+) and erbium (Er3+) doped calcium borophosphate (CBP) phosphors were prepared by solid state reaction method. These phosphors were characterized by XPS, photoluminescence (PL) and decay profiles. XPS spectra were recorded and discussed about various anionic groups. NIR photoluminescence spectra were measured and studied for Nd3+ and Er3+ doped CBP phosphors of different concentrations. The PL measurements showed that the intensity of luminescence increased with increasing doping concentrations upto 0.6 mol % and then decreased at higher concentrations due to the concentration quenching effect for both the ions. Decay curves were obtained for the energy levels, 4F3/2 of Nd3+ and 4I13/2 of Er3+ in these CBP phosphors and lifetimes were measured. In the case of Er3+ ion, visible emission and decay profiles were also measured in these phosphors. CIE color chromaticity diagrams are drawn for Er3+ ions in calcium borophosphate phosphors. The above results showed that Nd3+ and Er3+ doped CBP phosphors might be useful for NIR and green emission applications.
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