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Hydrothermal synthesis and optical characteristics of Eu3+ in Zn2SnO4 nanocrystals
Zuoling Fu,양현경,문병기,최병춘,Jung Hyun Jeong 한국물리학회 2009 Current Applied Physics Vol.9 No.6
Zn2SnO4:Eu3+ nanocrystals were one-step synthesized by hydrothermal method for the first time. All the products were systematically characterized by powder X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), electron probe X-ray microanalyzer (EPMA), photoluminescence (PL) and photoluminescent excitation (PLE). The characteristic peak of Eu3+-doped in Zn2SnO4 nanocrystals was also detected. The luminescent properties of blank and Eu3+- doped Zn2SnO4 nanocrystals were reported.
Synthesis, morphology and optical properties of SrTiO<sub>3</sub>:Pr<sup>3+</sup> phosphors
Fu, Zuoling,Li, Wenhao,Kyoung Yang, Hyun,Kee Moon, Byung,Chun Choi, Byung,Hyun Jeong, Jung Royal Swedish Academy of Sciences 2010 Physica scripta Vol.2010 No.t139
<P>SrTiO<SUB>3</SUB>:Pr<SUP>3+</SUP> phosphors with different morphologies were prepared by using high-temperature solid-state reaction, the solvothermal method and sol–gel synthesis. All the products were systematically characterized by powder x-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), photoluminescence (PL) and photoluminescent excitation spectra (PLE). The influence of different synthesis methods on the morphology and optical properties of SrTiO<SUB>3</SUB>:Pr<SUP>3+</SUP> was discussed.</P>
Synthesis, characterization and luminescence properties of of Eu3+-doped La2Sn2O7 nanospheres
Zuoling Fu,Hyun Kyoung Yang,Byung Kee Moon,최병춘,Jung Hyun Jeong 한국물리학회 2009 Current Applied Physics Vol.9 No.2
La2Sn2O7:Eu3+ nanospheres were prepared by a hydrothermal synthesis method. Well-crystallized and phase-pure La2Sn2O7:Eu3+ solid nanospheres ~400 nm in size can be readily obtained after calcination at 900℃, a temperature much lower than that of the conventional solid-state method. The prepared samples were systematically characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), photoluminescence (PL) and photoluminescence excitation spectra (PLE). Furthermore, PL results for the Eu3+-doped La2Sn2O7 nanospheres show that the material displays intense and prevailing emission at 585 nm belonging to the 5D0–7F1 magnetic dipole transition.
Low-temperature synthesis of CaTiO3 nanocrystals doped with Pr3+ ions and their luminescence.
Fu, Zuoling,Moon, Byung Kee,Yang, Hyun Kyoung,Jeong, Jung Hyun American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.6
<P>CaTiO3:Pr3+ nanocrystals were synthesized by solvothermal method. The as-prepared powders crystallized to the pure orthorhombic phase after calcination at 600 degrees C in air for 3 hours. CaTiO3:Pr3+ nanocrystals are petaline in shape with the decrease of the reactant concentration. The corresponding bulk CaTiO3:Pr3+ was synthesized by high temperature solid-state reaction. All the products were systematically characterized by powder X-ray diffraction (XRD), infrared spectroscopy (IR), field emission-scanning electron microscopy (FE-SEM), diffuse reflectance spectra (DRS), photoluminescence (PL) and photoluminescent excitation spectra (PLE). The luminescence mechanism and the size dependence of their fluorescence properties are also discussed.</P>
Zuoling Fu,Wangda Gong,Huaiyong Li,Qi Wu,Wenhao Li,양현경,정중현 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Nanocrystalline Eu^3+-doped pyrochlore oxide M_2Sn_2O_7 (M = Gd and Y) has been successfully prepared by a simple and facile hydrothermal synthesis method without the presence of catalysts. The effects of hydrothermal temperature, time and base concentration on the pure phase of the products are investigated. It is found that tuning the base concentration was a crucial step for the control of the pure phase of the M_2Sn_2O_7 (M = Gd and Y) nanocrystals. All the products were systematically characterized by powder X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier-Transform Infrared Spectroscopy (FT-IR), photoluminescence (PL)and photoluminescent excitation spectra (PLE). Furthermore, the luminescence mechanism and size dependence of their spectral properties are also discussed in detail.
Solvothermal Synthesis and Luminescent Properties of BaTiO3:Pr3+ Nanocrystals
Zuoling Fu,정중현,문병기,양현경 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III
In this paper, nanoscrystalline BaTiO$_3$:Pr$^3$$^+$ was prepared by using a solvothermal method, with barium acetylacetonate hydrate (Ba(C$_5$H$_8$O$_2$)$_2$xH$_2$O), titanium (IV) butoxide (Ti(OCH$_2$CH$_2$CH$_2$CH$_3$)$_4$), and praseodymium acetylacetonate hydrate (Pr(C$_5$H$_8$O$_2$)$_3$xH$_2$O) as precursors. The as-grown powders were found to be amorphous, and to have crystallized to the tetragonal phase after calcination at 700 $^\circ$C in air for 3 hours. The corresponding bulk BaTiO$_3$:Pr$^3$$^+$ was synthesized by using a high temperature solid-state reaction. Characterizations of the products were performed by using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), diffused reflectance spectra (DRS), photoluminescence (PL), and photoluminescent excitation spectra (PLE). The band gap change and the size dependence of fluorescence properties are also discussed.
Band Structure Calculations on Orthorhombic Bulk and Nanocrystalline SrY2O4
Zuoling Fu,정중현,양현경,Siyuan Zhang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
The electronic structure of SrY2O4 is calculated by using a density functional method, and the exchange and correlation have been treated by using a the generalized gradient approximation (GGA) within the scheme due to Perdew, Burke, and Ernzerhof (PBE). SrY2O4 is predicted to be a direct-gap material because the top of the valence band and the bottom of the conduction band are along the same direction at G. The bond length and the bond covalency are also calculated by using a chemical bond method. Compared with the SrY2O4 bulk crystal, the bond covalency of the nanocrystal has a decreasing trend; its band gap is also narrower; and the bond lengths of SrY2O4 nanocrystal become longer, which is responsible for the changes in the covalency and the band gap.
Zhen Sun,Guofeng Liu,Zuoling Fu,Xiangtong Zhang,Zhijian Wu,Yanling Wei 한국물리학회 2017 Current Applied Physics Vol.17 No.2
Yb3þ/Tm3þ co-doped BaGd2ZnO5 phosphors have been effectively synthesized by traditional sol-gel method. The graph of X-ray diffraction (XRD) exhibited that the obtained phosphors were pure orthorhombic phase. The morphology and composition of the samples were obtained by field emissionscanning electron microscope (FE-SEM) and the energy dispersive spectrometry (EDS). From upconversion luminance (UCL) emission spectra, the two strong blue emissions were obviously observed at 478 and 485 nm under the excitation of 980 nm. The possible energy diagram and UC mechanism were explained in detail. Optical temperature (T) sensing performances were evaluated in the temperature ranging 313 K - 573 K. And the highest sensor sensitivity calculated was 0.0055 K『1 at 323 K. Additionally, the laser excitation heating effect was also explored. The results indicated that Yb3þ/Tm3þ codoped BaGd2ZnO5 phosphors could be applied on optical temperature sensors and optical heater.