Optimum Design And Luminescence Properties Of Rare Earth Co-doped Phosphors

In recent years, with the increasing demand for rare earth doped luminescent materials in many application fields such as lighting, display, radiation field detection, and record, etc., achieving the optimal luminescent performance of new born rare earth doped luminescent materials has obtained extensive attention by scientific research personnel and production businesses. Meanwhile, for our country, promoting strongly test optimization techniques not only benefit our scientific research, production, and management, etc., but also has practical significance and urgency for rapidly developed all kinds of careers.Base on the above mentioned, the synthesis of Tm3+/Yb3+ and Y3+/Dy3+ co-doped phosphors and the luminescence properties were studied:1. The synthesis of Tm3+/Yb3+ co-doped BaY2ZnOs phosphors and the luminescence properties. The mathematic model and 3D model figure corresponding to blue up-conversion luminescent intensity and doping concentration, respectively, were built by coherently using the orthogonal design and quadratic general rotary unitized design method. Then the maximum value of mathematic model was obtained by Mathematica software calculation, and the ion doping concentration of optimal blue luminescent intensity was located. Next, the optimal sample was synthesized via high temperature solid state method and its luminescent property was studied. The result of XRD measuring indicated that the optimal sample was pure phase. In addition, it was found that the blue up-conversion luminescence is three photon process under 980 nm excitation. The luminescent intensities of the optimal sample at different temperature were calculated, and it was found that the blue emission intensity declined with increasing temperature, which is the thermal quenching behavior. The excitation energy was obtained by calculation, that is 0.602eV.2. The optimum design on the synthesis of Y3+/Dy3+ co-doped Bi2ZnB2O7 phosphors and the luminescence properties study. The mathematic model and 3D model figure corresponding to yellow down-conversion luminescent intensity and doping concentration, respectively, were built by coherently using the uniform design and quadratic general rotary unitized design method. Then the maximum value of mathematic model was obtained by Mathematica software calculation, and the ion doping concentration of optimal yellow luminescent intensity was found. Then the optimal sample was synthesized by high temperature solid state method, and its luminescent property was studied. The characterization of optimal sample crystal structure proved that the optimal sample was pure phase and the Dy3+ possessed the noncentrosymmetric crystal structure in Bi2ZnB2O7 matrix was also observed. In addition, for optimal sample, the fluorescent lifetime of Dy3+ was obtained to be 0.427 ms.