Mechanoluminescence, thermoluminescence and photoluminescence studies of UV/γ-irradiated Ba2MgSi2O7:Dy3+ phosphors

In this paper, Dy3+ doped phosphors were synthesized by high temperature solid state reaction technique. The phase purity of the sample was confirmed by the X-ray diffraction (XRD) technique. Elemental analysis was analyzed by using EDX. Photoluminescence spectra reveal that under the ultraviolet (UV) excitation at 352 nm, white light emitting phosphorescence originated from the mixtures of three emission of Dy3+ characteristic luminescence, the 481 nm blue emission (4F9/2-6H15/2), the 572 nm yellow emission (4F9/2-6H13/2) and the 672 nm red emission (4F9/2-6H11/2). Commission International del׳ Eclairage (CIE) color coordination was calculated, which confirms the white light emission of the phosphor. The thermoluminescence (TL) and mechanoluminescence (ML) properties of UV and γ-irradiated samples were studied, which reveals that, the maximum TL and ML intensity is obtained for 3 mol% of Dy3+ doping in Ba2MgSi2O7 phosphors for both UV and gamma irradiation. The TL intensity increases with the increase in UV exposure time up to 35 min after that it became saturated for higher UV exposure time. Also the TL intensity increases linearly with the increase in gamma dose up to 1475 Gy. The ML intensity of the phosphors increases with the increase in UV and γ-dose. Also the ML intensity of the phosphor increases proportionally with the increase in impact velocity of the moving piston.