Nano-rare Earth Phosphate Luminescent Materials And Their Luminescent Properties

Luminescent materials of LnPO₄ phosphor have been widely used for various lighting instruments and flat display apparatus because of their high luminescent intensities and chemical and caloric stability. With the development and application of the luminescent materials of rare earth, a new luminescent material-nanosized luminescent material of rare earth, has gradually attracted more attention in recent years. It has also become one of the hot topics at present. This paper tries to finish the work addressed as follows:Oxalate was firstly used in precipitation to attain highly purified grains ofnanosized luminescent material-LaPO₄:Eu³⁺. The result shows that the grain size isabout 70nm and the grains are very homogeneous. Different response temperature was carried out in the process and its effect on the sample morphology and luminescent intensity was tested by TEM and spectral studies. Besides, the sample was tested by different calcining heat. Thus we can get some implications about the relationship between luminescent intensity and synthesized structure of the sample. Compared with the samples attained by common co-precipitation, samples prepared by the methods above display stronger luminescence intensity. The result confirms that the grains have got higher quality of luminescence.In order to study the energy transfer of Bi³⁺â†'Eu³⁺ in Mg₃(PO₄)₂ ,co-precipitation was applied as the method to attain the nanosized luminescent grains Mg₃(PO₄)₂ : Bi³⁺, Eu³⁺. We analyze the quality of luminescence of Bi³⁺ and the displacement due to different Stokes. According to the change of proportion of Bi³⁺ in the sample, the concentration of Bi³⁺ has influenced the energy transference of Bi³⁺â†'Eu³⁺. we mainly discuss the mechanism of Bi³⁺â†'Eu³⁺ energy transference, and draw a conclusion that intermingling Bi³⁺ in Mg₃(PO₄)₂:Eu³⁺ can strengthen the luminescent intensity of the...