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Study On Hydrothermal Synthesis And Luminescence Property Of ASnO3:Eu3+?A=Ca,Sr,Ba? Nanocrystals

Posted on:2019-06-04Degree:MasterType:Thesis
Country:ChinaCandidate:Y Y MaFull Text:PDF
GTID:2371330545963827Subject:Inorganic Chemistry
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The alkaline earth metal stannate ASnO3?A=Ca,Sr,Ba?is a typical luminescent matrix material.Europium ion doped stannate nanomaterials have attracted more and more attention due to excellent red light emission properties,good thermal stability and chemical stability.In this dissertation,three kinds of matrix materials,Ca SnO3,SrSnO3 and BaSnO3 can be obtained as the main raw materials of Ca Cl2,SrCl2,BaCl2 and Na2SnO3 by hydrothermal method.The effects of pH value,Eu3+ion doping amount,the amount of surfactant,reaction temperature and reaction time were studied on the phase,morphology and luminescence property of the products.The optimum conditions for the synthesis of ASn O3?A=Ca,Sr,Ba?nanocrystals were determined by optimizing the reaction conditions.The main results were as follows:1.The CaSnO3:Eu3+nanocrystals with perovskite structure were prepared at pH range of 1013.The mixture of calcium stannate and calcium oxide was prepared at pH=9.The optimum conditions for hydrothermal synthesis of CaSnO3:Eu3+microspheres were as follows:the pH value of 12,the reaction temperature of 180?and the reaction time of 18 h.The morphology are microspheres in a diameter of 2.1?m2.5?m.The microspheres are uniform with smooth surface.The product exhibited the most excellent luminescence property when the doping amount of Eu3+ions was 5%.2.SrSnO3:Eu3+nanocrystals with perovskite structure were prepared at p H range of 913.The optimum conditions for hydrothermal synthesis of SrSnO3:Eu3+microspheres were as follows:the pH value of 12,the reaction temperature of200?and the reaction time of 24 h.The microspheres were 1.2?m1.6?m and composed of nanoparticles.The luminescence property of the product was the most excellent at the Eu3+doping amount of 5%.3.The optimum conditions for perovskite BaSnO3:Eu3+nanoparticles via hydrothermal process were as follows:the p H value of 12,the reaction temperature of 200?and the reaction time of 24 h.The products with Eu3+doping amount of15%exhibited the most excellent luminescence property.4.In comparison to three kinds of ASnO3:Eu3+?A=Ca,Sr,Ba?nanocrystals prepared under the optimum conditions,the results showed that:?1?The XRD diffraction peaks of CaSnO3,SrSnO3 and BaSnO3 crystals were similar.But the position of the diffraction peaks showed obviously a little shift,which was caused by the difference in the radius of alkali earth metal ions.?2?Under the optimum of adding Eu3+amount,the crystal plane spacing change??d?of ASnO3?A=Ca,Sr,Ba?nanocrystals was compared.Eu3+ions were mainly doped on CaSnO3?020?,?200?,?121?and?002?crystal planes.For SrSnO3,Eu3+ions were mainly doped on?200?crystal planes.For BaSnO3,Eu3+ions were mainly doped on?110?and?200?crystal planes.?3?The order of luminescence intensity for three crystals was:CaSnO3>SrSnO3>BaSnO3.ASnO3:Eu3+?A=Ca,Sr,Ba?nanocrystals of luminescence intensity was enhanced with the smaller the radius of alkali earth metal ions and the closer to the ionic radius of Eu3+ion.CaSnO3:Eu3+nanocrystals showed higher luminescence intensity.It is possible that the radius of Ca2+and Eu3+ions is closest and the small change of the lattice structure was caused by Eu3+ion doping into CaSnO3 crystal.
Keywords/Search Tags:hydrothermal method, stannate, morphology, luminescence, rare earth metal, ion radius
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