Enhancement Of Persistent Luminescence In Ca2sno4: Sm3+

Reddish-orange persistent luminescent Ca2SnO4: 0.1% Sm3+ co-doped with 0-10% Gd3+ was prepared using solid state synthesis. The phase formation and morphology was analyzed using X-ray diffraction and scanning electron microscopy. Incorporation of Sm3+ and Gd3+ in Ca2SnO4 lattice was investigated using site-selective spectroscopy and electron paramagnetic resonance.In all samples reddish-orange persistent luminescence and photochmmic effect was observed after excitation with UV as well as X-rays. The thermostimulated luminescence curves indicated that the introduction of Gd3+ increases the number of shallow traps of charges which enhance the intensity of persistent luminescence. In samples with high Gd3+ content (5-10%) an additional luminescence band in the near-infrared spectral region was detected. The origin of this band was discussed.