Dy3+:Ca2SnO4, a new yellow phosphor with afterglow behavior

This paper reports the photoluminescence and afterglow behavior of Dy3+ in Ca2SnO4 matrix (Dy3+:Ca2SnO4) prepared via a solid-state reaction. X-ray diffraction (XRD), photo luminescence spectroscope (PLS) and thermal luminescence spectroscope (TLS) were performed to investigate the physical properties of the phosphors. Typical 4F9/2 to 6Hj energy transition of Dy3+ ions was detected by PL spectra. CIE chromaticity coordinates of x = 0.4319, y = 4.456, calculated from the emission spectra, confirmed a yellow light emitting of the Dy3+:Ca2SnO4 phosphors. The Ca2SnO4 phosphors showed a typical afterglow behavior when the UV source was switched off. Thermal simulated luminescence study indicated that the persistent afterglow of Dy3+:Ca2SnO4 phosphors was generated by the suitable electron or hole traps which was resulted from the doping the Ca2SnO4 host with rare-earth ions (Dy3+).