Research Of Preparation And Luminescent Properties Nano/Micro Rare Earth Phosphate

Nano/Micro rare earth phosphate are widely studied for their application in Luminousdisplay, laser and biological fluorescence labeling, lighting light source, agriculture andmilitary, etc. This paper mainly studies the preparetion and fuminscent properties ofnano/micro-structure rare erath phosphate. Different samples were prepared byhydrothermal method. The structures were modified by adjusting the conditions. Such aspH, ions and the ratio between citric acid （CA） to ions. Luminscent properties of differentsamples were studied to find that different doped ions have different influence.Firstly we studied the structure and morphology of systematic rare earth phosphate.The samples of systematic rare earth phosphate were prepared under the same conditions.Comparing the morphology with XRD patterns, we found the particle crystalline phase oftransform from tetragonal to hexagonal phase, when the morphology performancefrom"nano flower " to nano rod and nano line gradient with the average ionic radiusincreasing. Changing the molar ratio of citric acid to Er, we found there is"nano-sponge"-like morphology. For the "nano flower" and "nano-sponge"-likemorphology, we believe they will have a good application prospect.Secondly, based on the basis of a preliminary discussion of the rare earth ionluminescence, we study morphology and optical properties of the rare earth ion Eu³⁺, Tb³⁺and non-rare earth ion Bi³⁺doped to GdPO₄basement. GdPO₄can grow to be a veryregular six prism shape, but by changing the ratio of CA. The final particle shape is similarto the "nano-flower" for the splitting phenomenon of the growth. Detection byfluorescence and fluorescence lifetime, we found that luminescence mainly come from theEu³⁺ions and Tb³⁺ions, Bi³⁺ions mainly affect the particle size without effect ion on thelight.Finally, morphology and optical properties of the rare earth ions Eu³⁺, Tb³⁺, Dy³⁺andCe³⁺doped YPO₄base were studied. Dy³⁺ions doped YPO₄particles also show "nano flower" cluster, with full of nanotubes on the surface of particles. Through thefluorescence lifetime test, we know that energy transfers from Dy³⁺ions to Eu³⁺, Tb³⁺ionsdoesn’t occur and when the Eu³⁺and Tb³⁺ions concentration is high, it will concealledDy³⁺ion emission peak. But energy transfers from Ce³⁺ions to Eu³⁺, Tb³⁺ions can makethe Eu³⁺ions and Tb³⁺ions photoluminescence peak significantly enhanced. We also testfluorescence of YPO₄:20%Eu in pulse high magnetic field and found the Zeeman Effectby energy level split in the magnetic field. We speculated that rare earth phosphateNano-luminescence in high magnetic field has a wealth optical properties, and thereforewith high research value.