| Recently, Nd3+/Yb3+ doped near-infrared inorganic fluorescent materials have great prospect in terms of immunofluorescence labeling, because of its biological penetration, high sensitivity, easy to operate, does not cause harm to biological tissue and other features. However, the NIR luminescence intensity of Nd3+/Yb3+ is weak, which leads to the limitation in practical application currently. Bi3+ is always as light-sensitive ionic to increase the NIR of Nd3+/Yb3+ doped inorganic commonly. Therefore, this paper aims at finding new host matrixs to improve the Nd3+/Yb3+ NIR luminescence, and research the sensitizing effect of Bi3+ to Nd3+/Yb3+ NIR luminescence in those host matrixs. The conclusions and results were summarized as follows:ScVO4:Nd3+/Yb3+ phosphors were prepared by high temperature solid-state method. The NIR luminescence of samples were monitored by self-assemblied fluorescence testing advice combined with AVANTES-2048 TEC fiber optic spectrometer. It was found that, in Sc VO4 matrix, VO43- can effectively transfer energy to Nd3+/Yb3+, thus sensitize the NIR luminescence of Nd3+/Yb3+ luminescence. The effect of Nd3+/Yb3+ doping concentration concentration on luminescence properties was investigated. The optimum doping concentration of Nd3+ is 0.5%(mol), and Yb3+ is 3%(mol). In Sc VO4:Nd3+/Yb3+, the energy transfer mechanism between VO43- and Nd3+/Yb3+ also has been speculated. The luminescence properties of Bi3+ in Sc VO4 has been analyzed. And its sensitization to Nd3+/Yb3+ and possible reasons in Sc VO4 has been researched.Series Gd VO4:Nd3+/Yb3+ near-infrared light-emitting samples were prepared by high temperature solid-state method. It was found that in the matrix, VO43- also can effectively transfer energy to Nd3+/Yb3+, sensitized the luminescence of Nd3+/Yb3+. The effect of Nd3+/Yb3+ doping concentration to NIR luminescence has been determined. optimum doping concentration of Nd3+ is 0.25%(mol), optimum doping concentration of Yb3+ 5%(mol). And we have further studied the sentisization of Bi3+ to Nd3+/Yb3+in Gd VO4. Contrasting the emission of YVO4:Bi3+,Sc VO4:Bi3+ and Gd VO4:Bi3+ in order to analyze the sensitization effects of Bi3+ to the emission of Nd3+/Yb3+ in three kinds of vanadate.Y3Ga5O12:Bi3+,Nd3+/Yb3+ Samples also prepared by high temperature solid-state method. It was found that, in YGG system, Bi3+ can sensitize the NIR luminescence of Nd3+/Yb3+. The luminescence property of Bi3+ in the YGG were studied, and the impact of Bi3+ on Nd3+/Yb3+ NIR has been speculated. For YGG system, the impact of Bi3+ doping concentration on Nd3+ is more obvious, while the impact on Yb3+ is not so obvious. |
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