The novel phosphors of La2MoO6 activated with the trivalent rare earth Ln3＋ （Ln=Eu, Sm, Dy, Pr, Tb） ions were synthesized by solid state reactions at high temperature in air atmosphere, and their phase impurities a...The novel phosphors of La2MoO6 activated with the trivalent rare earth Ln3＋ （Ln=Eu, Sm, Dy, Pr, Tb） ions were synthesized by solid state reactions at high temperature in air atmosphere, and their phase impurities and luminescent properties were studied. The photolu- minescence （PL） excitation and emission spectra, and decay curves were employed to study their luminescence properties. The lifetimes of the characteristic emissions from Ln3＋ ions were in the order of millisecond except Pr3＋ ions. （LaEu1-x）2MoO6 was a promising phosphor for practical application and the optimum concentration was x=0.075. The concentration quenching mechanism of Eu3＋ was also discussed by theoretical fitting using Burshtein model.展开更多
Ho3＋ ions doped tellurite-borate glass samples with varying compositions were prepared. The compositional dependence on phenomenological Judd-Ofelt parameters was compared in different kinds of rare earth ions doped ...Ho3＋ ions doped tellurite-borate glass samples with varying compositions were prepared. The compositional dependence on phenomenological Judd-Ofelt parameters was compared in different kinds of rare earth ions doped tellurite-borate glasses. Two methods were used to obtain radiative transition probability of 517 level with the aim of assuring the fitting quality. The integral absorption cross-sections and line shapes corresponding to 518--.5G6 and 518---5I7 transition of Ho3＋ ions were investigated in tellurite-borate glasses. The obtained data indicated that the integral absorption cross-sections corresponding to 518-5G6 transition of Ho3＋ ions mainly depended on phenomenological Judd-Ofelt parameter, g22, because 518---5G6 transition belonged to hypersensitive transitions, which led to a larger gP2 value. The change of line shapes of absorption spectra corresponding to 518-5G6 and 518-517 transitions of Ho3＋ ions came from the lower energy regions, which could be attributed to the changed distribution of Stark levels and thermal population.展开更多
基金Project Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (2011-508)Technology Program of Hunan Provincial Department of Housing and Urban-Rural Development (201020)+1 种基金Science and Technology Program of Hunan Province (2011GK3223)the Industrial Strategic Technology Development Program (10037416) funded by the Ministry of Knowledge Economy (MKE, Korea)
文摘The novel phosphors of La2MoO6 activated with the trivalent rare earth Ln3＋ （Ln=Eu, Sm, Dy, Pr, Tb） ions were synthesized by solid state reactions at high temperature in air atmosphere, and their phase impurities and luminescent properties were studied. The photolu- minescence （PL） excitation and emission spectra, and decay curves were employed to study their luminescence properties. The lifetimes of the characteristic emissions from Ln3＋ ions were in the order of millisecond except Pr3＋ ions. （LaEu1-x）2MoO6 was a promising phosphor for practical application and the optimum concentration was x=0.075. The concentration quenching mechanism of Eu3＋ was also discussed by theoretical fitting using Burshtein model.
基金supported by the National Natural Science Foundation of China(50902042)the Natural Science Foundation from Education Department of Hebei Province(ZD2014069)
文摘Ho3＋ ions doped tellurite-borate glass samples with varying compositions were prepared. The compositional dependence on phenomenological Judd-Ofelt parameters was compared in different kinds of rare earth ions doped tellurite-borate glasses. Two methods were used to obtain radiative transition probability of 517 level with the aim of assuring the fitting quality. The integral absorption cross-sections and line shapes corresponding to 518--.5G6 and 518---5I7 transition of Ho3＋ ions were investigated in tellurite-borate glasses. The obtained data indicated that the integral absorption cross-sections corresponding to 518-5G6 transition of Ho3＋ ions mainly depended on phenomenological Judd-Ofelt parameter, g22, because 518---5G6 transition belonged to hypersensitive transitions, which led to a larger gP2 value. The change of line shapes of absorption spectra corresponding to 518-5G6 and 518-517 transitions of Ho3＋ ions came from the lower energy regions, which could be attributed to the changed distribution of Stark levels and thermal population.
