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Chemical Preparation and Photoluminescence Characterization of YVO4:Eu3+ Nanocrystal

Author: GaoTeng
Tutor: ZhangWeiHua
School: Xi'an University of Technology
Course: Materials Science and Engineering
Keywords: NAC-FAS YVO4: Eu3 Nanocrystalline Chemical mechanism Photoluminescence
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 29
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Abstract


Y (NO3) 3 - 6H2O , NH4VO3 and Eu2O3 as the starting raw materials , the use of the NAC-FAS method synthesized YVO4 and nanocrystalline YVO4: Eu3 LT ; 100 ° C temperature of the atmospheric pressure, atmospheric conditions , by changing the synthesis process the various process parameters , including the alcohol-water ratio of NaOH added in an amount and the reaction time , to study the impact synthetic YVO4 Nanocrystals ; discussed on this basis , the process parameters in the synthesis process , YVO4 : Eu3 nanometer crystal direct chemical synthesis the impact of the law and NAC-FAS synthesis of YVO4 and multi- element YVO4 : Eu3 chemical mechanism ; research related YVO4 : of Eu3 nanocrystalline crystal structure , grain size , surface state and Eu3 doped amount YVO4: Eu3 nanocrystal photoluminescence properties of the role of law . The results show that : ( 1 ) NAC- FAS method of direct synthesis of nanocrystalline YVO4 and YVO4: of Eu3 chemical process , YVO4 and YVO4: Eu3 solid- phase precipitation is dissolved in the alcohol - water system of yin cationic reaction to form insoluble , insoluble reaction product (EuVO4, YVO4) formed ; insoluble , the precipitation process of the insoluble reaction product , and some reached critical solid nucleation size solid phase precipitates to form a solid phase core , or precipitated phase attached to the existing core length Great form a solid phase product; in certain pH environment , with the conduct of the precipitation process , the solid phase core gradually grow up, the precipitated phase by the process of \and YVO4: Eu3 nanocrystals . (2) in an alcohol water ratio of 100/150 , of NaOH Add an amount of 2G , the reaction time is 2 -6h , the different Eu3 doping amount under the experimental conditions , YVO4: of Eu3 Nanocrystals average grain size of about 25.0 ± 2.0 nm, in 325nmHe-Cd laser excitation YVO4: of Eu3 emission spectra in the 619nm and 702nm at which at 619nm with the strongest emission peak , of Eu3 critical quenching concentration of about 20% . (3) As to the degree of crystallinity increased, the grain size is increased , the Nanocrystals photoluminescence intensity was significantly enhanced; under the study conditions , the use of microwave treatment YVO4 : PL intensity of Eu3 Nanocrystals than untreated an increase of about 400% . 800 ° C conventional heat treatment lh, YVO4 : PL intensity of Eu3 nanocrystals increased by approximately 500% compared to untreated .

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