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- 저자 : Jingbao Liu (검색결과 4 건)
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Synthesis of Gd2O2S : Eu3+ hollow sphere by a hydrothermal method assisting with reduction route
Jingbao Lian,Fan Liu,Ping Liang,Jianmin Ren,Feng Liu 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.7
Gd2O2S : Eu3+ hollow spheres were successfully synthesized through a hydrothermal method assisting with reduction routefrom commercially available Gd2O3, Eu2O3, HNO3, (NH4)2SO4 and CO(NH2)2 (urea) as the starting materials. The assynthesizedproducts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM) and photoluminescence (PL)spectra. The XRD and FT-IR results demonstrate that the precursor has highly crystalline in nature and could be convertedinto pure Gd2O2S phase at 800 oC for 2 hrs in the hybrid atmosphere of flowing argon and hydrogen (90%Ar + 10%H2). SEMand FE-SEM observations show that the obtained Gd2O2S particles possess hollow sphere structure, which has a typical sizeof about 10 μm in diameter and about 1 μm in shell thickness. PL spectroscopy reveals that the strongest red emission peakis located at 628 nm under 277 nm and 330 nm UV light excitation for the Gd2O2S : Eu3+ (5%mol) hollow spheres, whichcorresponds to the 5D0 → 7F2 transition of Eu3+ ions. Decay study demonstrates that the 5D0 → 7F2 transition of Eu3+ ions hasa single exponential decay behavior. The fitting result shows the lifetime for the 5D0 → 7F2 transition under 277 nm and 330 nmUV light excitation is 0.5692 ms and 0.5435 nm, respectively.
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Fan Liu,Xuri Wang,Yanyu Yang,Jing Zhang,Zhaoren Zhang,Jingbao Lian 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
The Gd2O2SO4 : Yb3+,Er3+ nanoparticles were synthesized by a general and facile hydrothermal synthesis followed bycalcination utilizing commercially available Gd2O3, Yb2O3, Er2O3, HNO3, urea and C12H25SO4Na as the starting materials. Theprecursor and the synthetic products were characterized by a variety of characterization tools. The results reveal that theprecursor is composed of gadolinium hydroxyl, carbonate and sulfate groups and could be converted into pure Gd2O2SO4phase by calcining at 800 oC for 2 hrs in air. The good crystallinity and dispersion of near-spherical Gd2O2SO4 nanoparticleswere obtained with an average diameter of about 50 nm. Under 980 nm infrared light excitation, the Gd2O2SO4 : Yb3+,Er3+nanoparticles present the strongest red emission (664 nm), which corresponds to the 4F9/2 → 4I15/2 transition of Er3+ ions. Moreover, two green emission peaks are located at 546 nm and 526 nm, resulting from the 4S3/2 → 4I15/2 and 2 H11/2 → 4I15/2transitions of Er3+ ions, respectively. When the concentration of Er3+ ions reaches 2%, the Gd2O2SO4 : Yb3+,Er3+ nanoparticlesshows the highest luminescence. The Ln(Iup)-Ln(P) plots confirm that the up-conversion (UC) excitation belongs to two-photon(4F9/2 → 4I15/2 and 4S3/2 → 4I15/2) and three-photon (2H11/2 → 4I15/2) absorption mechanisms.
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Xin Zhanga,Mingyang Liu,Jiao He,Jingbao Lian,Xue Zhang 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.4
A general precursor of Lu2O2SO4 and Lu2O2S was synthesized by homogeneous precipitation methods using commerciallyavailable Lu2O3, H2SO4, Eu(NO3)3·6H2O, CO(NH2)2, NH3·H2O, Na2CO3 and S as the main raw materials, and thenLu2O2SO4:Eu3+ is calcined under air atmosphere at different temperatures, which simplified the previous experimental steps. On this basis, a series of Eu3+ doped Lu2O2S phosphors were synthesized by the solid phase method using the precursor asraw material by mixing sodium carbonate and sublimated sulfur. Lu2O2SO4:Eu3+ and Lu2O2S:Eu3+ quasi-sphericalluminescent powder with particle sizes of about 1 μm were synthesized and their synthetic mechanism and photoluminescenceproperties were investigated. Finally, the synthesized products were characterized by X-ray powder diffraction (XRD), fieldemission scanning electron microscope (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), differential scanningcalorimeter (DSC-TG), photoluminescence spectroscopy (PL) and other analytical and testing methods. Studies have shownthat the optimum calcination conditions of Lu2O2SO4:x%Eu3+ phosphors and Lu2O2S:x%Eu3+ phosphors are at 800 ℃ for2 h in air and at 500 ℃ for 2 h in a closed sulphuration atmosphere, respectively. On this basis, the photoluminescence (PL)behavior of the two prepared fluorescent powders was analyzed. At approximately 618 nm and 628 nm, lutetium basedoxysulfate and oxysulfide phosphors exhibit typical red emission, which is the main luminescent feature of Eu3+, originatingfrom the 5D0-7F2 transition of Eu3+.The CIE color coordinates of the Lu2O2SO4:Eu3+ and Lu2O2S:Eu3+ phosphors correspondto (0.6573, 0.3423) and (0.621, 0.3769), respectively, and their colors are red-orange and orange light. The optimal dopingconcentration was determined to be 7.5%. The fluorescence lifetime of Lu2O2SO4:7.5%Eu3+ and Lu2O2S:7.5%Eu3+ phosphorsobtained by homogeneous precipitation method is 2.4479 ms and 1.004 ms. The CCT values are 2886 K and 1863 K, whichbelong to low penetration CCT light. They all have short afterglow life, and lutetium oxysulfate phosphor has longerfluorescence life than lutetium oxysulfide phosphor.
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Shan-hu Qiu,Ziwei Du,Weiling Li,Juan Chen,Hang Wu,Jingbao Liu,Min Cai,Bei Wang,Haijian Guo,Zi-lin Sun 대한진단검사의학회 2020 Annals of Laboratory Medicine Vol.40 No.6
Background: Diabetes can complicate hypertension management by increasing the risk of cardiovascular disease (CVD) and all-cause mortality. Studies targeting diabetes detection in hypertensive individuals demonstrating an increased risk of diabetes are lacking. We aimed to assess the performance of hemoglobin A1c (HbA1c) and its cut-off point in detecting diabetes in the abovementioned population. Methods: Data from 4,096 community-dwellers with hypertension but without known diabetes were obtained from the Study on Evaluation of iNnovated Screening tools and determInation of optimal diagnostic cut-off points for type 2 diaBetes in Chinese muLti-Ethnic (SENSIBLE) study; these data were randomly split into exploration (70% of the sample) and internal validation (the remaining 30%) datasets. The optimal HbA1c cut-off point was derived from the exploration dataset and externally validated using another dataset from 2,431 hypertensive individuals. The oral glucose tolerance test was considered the gold-standard for confirming diabetes. Results: The areas under the ROC curves for HbA1c to detect diabetes were 0.842, 0.832, and 0.829 for the exploration, internal validation, and external validation datasets, respectively. An optimal HbA1c cut-off point of 5.8% (40 mmol/mol) yielded a sensitivity of 76.2% and a specificity of 74.5%. Individuals who were not diagnosed as having diabetes by HbA1c at 5.8% (40 mmol/mol) had a lower 10-year CVD risk score than those diagnosed as having diabetes (P=0.01). HbA1c≤5.1% (32 mmol/mol) and ≥6.4% (46 mmol/mol) could indicate the absence and presence of diabetes, respectively. Conclusions: HbA1c could detect diabetes effectively in community-dwellers with hypertension.
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