Dysprosium doped di-calcium magnesium di-silicate white light emitting phosphor by solid state reaction method

摘要: In this paper, we report the dysprosium doped di-calcium magnesium di-silicate namely Ca2MgSi2O7:xDy3+ (x = 1.0, 1.5, 2.0, 2.5 and 3.0 mol%) phosphors were prepared by traditional high temperature solid state reaction method. Phosphors with optimum photo-luminescence intensity [Ca2MgSi2O7:Dy3+ (2 %)] characterized X-ray diffraction (XRD) technique. The crystal structure of sintered an akermanite type which belongs to tetragonal crystallography space group $$ {\text{P}}\overline{ 4 2}_{1} {\text{m}} $$ . chemical composition phosphor Ca2MgSi2O7:Dy3+ (2 %) was confirmed energy dispersive spectroscopy (EDS). Under ultraviolet excitation, emission spectra composed broad band characteristic Dy3+ ions are peaking at 475 nm (blue), 577 nm (yellow) 678 nm (red), originating from transitions 4F9/2 → 6Hj (where j = 15/2, 13/2, 11/2). combination these three emissions constituted white light as indicated on Commission Internationale de l’Eclairage chromaticity diagram. possible mechanism emitting also investigated. Investigation decay property show that held fast slow process. peak mechanoluminescence (ML) increases linearly increasing impact velocity moving piston, suggests can be used sensors detect stress object. Thus present investigation indicates piezo-electricity is responsible produce ML in phosphors.