Preparation,Characterization And Properties Of Several Rare Earth Micro/nano Materials

Owing to their specific properties,which including surface effect,small size effect,and quantum size effect,etc.Micro/nano materials show a series of excellent properties,such as special optical,electrical,magnetic,catalytic and sensitization performance compared with many conventional block materials.Rare earth doped micro/nano luminescent materials as a new type of micro/nano material drawn more and more attention and research.Rare earth doped micro/nano luminescent materials are widely used in lighting,detection,display,and other fields.Among them,rare earth fluoride and oxides with their prominent advantages and characteristics makes them very good luminescence substrate materials.Solvent/hydrothermal synthesis caused a widely attention,due to it is a good method of preparing rare earth doped micro/nano materials.Gd F₃ is a very important one of the rare earth fluorides,it is very widely used in the field of optoelectronics.Y₂O₃:Eu³⁺is known as the red phosphors,and it has been widely used in the fluorescent lamp,field emission display and a cathode ray tube,and other fields.In this paper,using a simple,low cost and convenient solvent/hydrothermal synthesis method to prepare rare earth doped micro/nano luminescent material.The as-obtained products were characterized by using a variety of characterization method,and the morphology of the synthesized product,probable forming mechanism and performance are discussed,which may provide the rule of induction the corresponding theoretical basis and experimental methods for other rare earth doped nanostructured luminescent materials.The main content of this thesis are as follows:（1）The copper-like hollow ring Gd F₃:Eu³⁺hydrothermal:synthesis,characterization and luminescent propertiesThe copper-like hollow ring Gd F₃:Eu³⁺have been successfully prepared through a simple water solvent synthesis with the Gd³⁺as the center ion,KBF₄ as reaction material and rare earth(Re=Eu³⁺)ions as the doping ions.The as-prepared products were characterized by PXRD,SEM,TEM and EDX.Results show that the copper-like hollow ring is hexagonal phase of Gd F₃,and its diameter is about 500 nm.The effect of reaction time and concentration of Eu³⁺on the morphology was discussed,results shown that when the doped amount of Eu³⁺is 15%the luminous intensity is the largest.At the same time,It could be seen in the CIE chromaticity diagram,compare the samples under different concentrations,when the concentration of doped Eu³⁺is 1%,the color of its luminescence is orange red,and the chromaticity of other concentration overlap together,the color of them are pure red.Finally we also studied the magnetism performance,results show that the Gd F₃:Eu³⁺is a kind of typical paramagnetic material.（2）Rare earth-doped(RE=Yb³⁺,Er³⁺)gadolinium-based raisins-like nanorod:synthesis and transformation on the luminescence researchRare earth-doped(Re=Yb³⁺,Er³⁺)gadolinium-based upconversion raisins-like nanorod were synthesized through simple hydrothermal synthesis without any surfactant.Its rough surface,the length of nanorod is 400⁵00 nm,and the wide of nanorod is 100 nm.The as-obtained products characterized in detail by the PXRD,SEM and EDX.Meanwhile,we have systematic study on upconversion and luminescence performance of the as-obtained products.（3）Rare earth-doped(Eu³⁺)Y₂O₃ hollow microspheres:synthesis and luminous performance researchIn this work,uniform coordination polymer microspheres have been successfully prepared by using isophthalic acid（IPA）as the organic ligand,Y³⁺as the center metal ions and rare earth(RE=Eu³⁺)as the doping ions through a simple（DMF）solvent thermal method.Then Y₂O₃:Eu³⁺hollow nanospheres were prepared by annealing the corresponding coordination polymers at 800 ^o C for 4 h.Then the typical sample was characterized with PXRD,SEM,TEM,TG-DTG,FT-IR,EDX in detailed.It could be seen from the 1931 CIE chromaticity diagram that the color before annealing of Y-CP:Eu³⁺is orange red,and Y₂O₃:Eu³⁺is pure red.At the same time,the luminous properties before and after calcination were studied.In comparison to precursor,the luminous intensity has been significantly enhanced.（4）Synthesis and luminescence properties of Gd F₃:Eu³⁺nanoparticles by annealing of corresponding gadolinium coordination polymers as precursorFirstly,Gd-based coordination polymer precursor was prepared successfully employing Gd³⁺as the center metal ions and isophthalic acid（IPA）as an organic ligand by a simple（DMF）solvothermal method.Then,the Gd F₃:Eu³⁺have been synthesized by using Gd-based coordination polymer precursor,which it reacted with different fluoride source in deionized water.The as-obtained of products were characterized by PXRD,SEM,TEM and FT-IR,EDX.The luminous properties with using different fluoride source were studied.It found that KBF₄ was the best.It could be seen from the 1931 CIE chromaticity diagram that the colors of all the obtained Gd F₃:Eu³⁺were orange red.