Hot Isostatic Pressing and Characterizations of Eu3+-doped(Gd,Lu)2O3 Transparent Ceramics
(Gd,Lu)2O3∶Eu scintillation ceramics have promising applications in the high-energy X-ray imaging.Eu0.1Gd0.6Lu1.3O3 nano-powders with pure phase were prepared from the precursor calcined at 1 050℃for 4 h by the co-precipitation method.Using the synthesized nano-powders as initial material,Eu0.1Gd0.6Lu1.3O3 ceramics were fabri-cated by vacuum pre-sintering at different temperatures for 2 h and hot isostatic pressing(HIP)at 1 750℃for 3 h in ar-gon.The influence of pre-sintering temperature on the microstructure,optical and luminescence properties was investi-gated.The Eu0.1Gd0.6Lu1.3O3 ceramics pre-sintered at 1 625℃for 2 h combined with HIP post-treatment show the high-est in-line transmittance of 75.2%at 611 nm.The photoluminescence(PL)and X-ray excited luminescence(XEL)spectra of the Eu0.1Gd0.6Lu1.3O3 transparent ceramics demonstrate a strong red emission peak at 611 nm due to the 5D0→7F2 transition of Eu3+.The PL,PLE and XEL intensities of the HIP post-treated Eu0.1Gd0.6Lu1.3O3 ceramics show a trend of first ascending and then descending with the increase of pre-sintering temperature.The thermally stimulated lumines-cence(TSL)curve of the HIP post-treated Eu0.1Gd0.6Lu1.3O3 ceramics presents one high peak at 178 K and two peaks with lower intensities at 253 K and 320 K.The peak at 320 K may be related to oxygen vacancies,and the lumines-cence peak at 178 K is related to defects caused by the valence state changes of Eu3+ions.
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