Influence of Eu3+ doping concentration on the luminescence properties of Y2O2S: Eu3+, Mg2+, Ti4+ nanoarrays via sol-gel template method

Firstly, Y(2-x-0.04)O3: xEu(3+), Mg-0.02(2+), Ti-0.02(4+) (x = 5.0 mol%, 5.5 mol%, 6.0 mol%, 6.5 mol% and 7.0 mol%) nanotube arrays were synthesized by sol-gel template method to serve as the precursors. Then the precursors were calcined in CS2 condition at 850 degrees C for 2 h to obtain the red long afterglow phosphor Y2O2S: Eu3+, Mg2+, Ti4+ nanotube arrays with different Eu3+ doping concentration. The samples of theY(2)O(2)S: Eu3+, Mg2+, Ti4+ nanotube arrays were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), photoluminescence spectroscopy and long-lasting phosphorescence. SEM proves that the Y2O2S: Eu3+, Mg2+, Ti4+ nanotube arrays are highly ordered and have uniform size. XRD testified that the main phase constitution of the phosphor is Y2O2S. From the spectrum, the main emission peaks at 616 nm and 626 nm are excited by the 339 nm UV excitation, which are ascribed to the Eu3+ ions transition from D-5(0) to F-7(2). After irradiation by 365 nm UV radiation for 10 min, the decay time of the Y2O2S: Eu3+, Mg2+, Ti4+ nanotube arrays with 6.5 mol% Eu3+ doping concentration could last for over 280 s (>= 1 mcd/m(2)). (C) 2013 Elsevier B.V. All rights reserved.