Organic Surfactant Induction Of Rare-Earth Phosphate

Rare earth phosphate luminescent namomaterial belong to a member of the luminescent namomaterials because of its high luminescent intensity, high efficiency of the quantum and good thermal stability. It has been attracted much attention because it has better thermal and chemical stability comparing with organic and polymer materials. Thus it in the special glass, laser technology ,compact fluorescent light, form plasma flat panel display and biological field has a broad prospect of application.In this article, lanthanide orthophosphate nanostructures have been successfully synthesized using a hydrothermal method. During the preparation, synthesis conditions was controled by adding different kinds of surfactant and changing phosphorus source. Through the methods of X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), light electroluminescent spectrum (PL), the sample crystal structure,morphology and luminescent properties were characterized.By the control of hydrothermal condition, tetragonal phase, the hexagonal phase of the Eu doped LnPO₄(Ln=Dy, Y, La) nanostructured luminescent material was successfuly synthesized. The influence of the temperature and pH value to the DyPO₄ structure has been studied. The results show that: In different pH environment, we can get the different structure DyPO₄, the higher the temperature, the more the better crystalline. The influence of the surfactant CTAB, EDTA, citric acid to LnPO₄ (Ln = Dy,Y,La) structure, morphology ,and luminescence properties are discussed. For YPO₄: Eusample, the performance is that the characteristics of the Eu³⁺ luminescent property was enhanced. For LaPO₄: Eu sample, which result in the strong luminescent intensity. For DyPO₄: Eu sample, the luminescent spectra was special.We also studied the different source for LnPO₄ phosphorus (Ln = Dy, Y ,La),the structure, morphology were changed. A study of the photoluminescence in Eu³⁺-doped lanthanide phosphates has shown that the optical properties of these nanophosphors are strongly dependent on their crystal structures and morphologies.