Dissertation > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Ceramics

Preparation and Characterization of Y2O3:Eu3+ Optical Ceramics

Author YuNa
Tutor ZhangXiYan
School Changchun University of Science and Technology
Course Materials Physics and Chemistry
Keywords yttrium oxide luminescent ceramics chemical coprecipitation method solid state method nano-powder
CLC TQ174.7
Type Master's thesis
Year 2013
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Y2O3:Eu3+nano-materials matrix ideal performance so far is extensively studied. At home and abroad of Y2O3:Eu3+materials research mostly concentrated powder,scholars of Y2O3:Eu3+thin-film materials have research,about Y2O3:Eu3+luminescence ceramic materials is rarely reported in the preparation process, ion doped,ceramicinduced density and light transmission rate to be further investigated. The preparation of Y2O3:Eu3+nanopowder and luminescent ceramic, the main contents are as follows:First of all, NH4HCO3, NH3·H2O and oxalic three precipitating agent, respectively, by co-precipitation prepared Y2O3:Eu3+nanopowder precursor materials. TG-DSC, XRD, SEM, PL testing means, study the ignition temperature, holding time, Eu3+ion doping concentration on the Y2O3:Eu3+nanopowder microstructure and luminescent properties of impact. The results show that the process is relatively simple NH4HCO3precipitation Preparation of precursor, at1000℃,6h, Eu3+doping amount prepared9at%Y2O3:Eu3+nanopowder best, with an average particle size of75nm. Sample under254nm UV excitation, emits a strong611nm pure red.Secondly, using the solid phase for preparation of Y2O3:Eu3+luminescent ceramics.Sintering temperature, holding time of Y2O3:Eu3+luminescence ceramic material phase microstructure and spectral impact. The results show that the best1850℃,12h Preparation of Y2O3:Eu3+luminescence ceramics.Again, using ammonium bicarbonate co-precipitation method of the preparation of Y2O3:Eu3+nano-powder preparation Y2O3:Eu3+luminescence ceramic. Sintering temperature, holding time of Y2O3:Eu3+luminescence ceramic material phase microstructure and spectral impact. The results showed that of1850℃,12h sintered sample after the diffraction peak is most acute, observation of the surface morphology and the SEM picture of the cross-sectional morphology of, discovered that there are holes, the presence of impurities, the transmittance of the sample and compactness, but the grain boundaryclear and clean, narrow. Density less than the theoretical density of the powders of Y2O3.254nm ultraviolet light excitation emits red light of611nm.Finally, in order to improve of Y2O3:Eu3+nano-powders, as well as of Y2O3:Eu3+luminescence luminescent properties of the ceramic precursor late hydrothermal treatment of experimental. The hot water temperature, calcinations temperature, holding time on Y2O3:Eu3+nano powder which, microscopic structure and the effect on the properties of light. The results showed that the1000℃,4h under the condition of the preparation of Y2O3:Eu3+nano powder of luminous performance is best, luminous intensity without water heat treatment than the sample of the luminous intensity nearly twice. The best preparation of Y2O3:Eu3+nano powder preparation into Y2O3:Eu3+luminescent ceramics, the heat preservation time of Y2O3:Eu3+luminescent ceramics which, microscopic structure and the influence of the spectrum. The results showed that the1850℃,12h the same conditions of the preparation of ceramic samples, the water after heat treatment for Y2O3:Eu3+luminescent ceramics, the luminous intensity is almost without water obtained by heat treatment of Y2O3:Eu3+luminous ceramic one times.

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