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Study On Preparation And Performance Of GGG:RE3+(EU3+,Tb3+),Bi3+ Polycrystalline Luminous Powders

Posted on:2017-10-21Degree:MasterType:Thesis
Country:ChinaCandidate:H M LiuFull Text:PDF
GTID:2311330503993316Subject:Chemistry
Abstract/Summary:PDF Full Text Request
Gadolinium gallium garnet is an excellent matrix material, and its luminescent after rare earth ion-doped has been widely used in many fields, such as display, illumination and detection. In this thesis paper, GGG: Eu3+, Bi3+/GGG: Tb3+, Bi3+ polycrystalline luminous powders were successfully synthesized by a sol-gel combustion strategy and co-precipitation method with the Gd2O3, Ga2O3, Eu2O3, Tb2O3 and Bi(NO3)3·5H2O as raw materials. And then the prepared materials were characterized by X-ray diffraction(XRD), Scanning electron microscope(SEM), Fourier transform infrared(FT-IR) and photoluminescence(PL).The analysis results of XRD, TG-DTA and FT-IR showed that the best calcined temperature of samples forming GGG phase was at 850 ?. The SEM image showed that the powders had different degrees of agglomeration. The results of PL showed that the fluorescence emission peak of the GGG: Eu3+, Bi3+ polycrystalline luminous powders was at 592 nm and610 nm, which was corresponding to the 5D0-7F1 and 5D0-7F2 of Eu3+, and the PL emission peak of the GGG: Tb3+, Bi3+ polycrystalline luminous powders was at 489 nm and 544 nm,which was corresponding to the 5D4-7F6 and 5D4-7F5 of Tb3+. Moreover, the luminescence intensity of the samples with Bi3+ was distinctly stronger than that of non-doped Bi3+, and the emission peak position was not changed, which proved that there exist the energy transfer between Eu3+/Tb3+ with Bi3+, thereby enhancing luminescence intensity of the centrosome matrix.
Keywords/Search Tags:GGG: Eu3+,Bi3+/GGG: Tb3+,Bi3+, sol-gel combustion method, co-precipitation method, Polycrystalline luminous powder
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