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Zhang, Suyin,Zhang, Pengyue,Liu, Xin,Yang, Zhexi,Huang, Yanlin,Seo, Hyo Jin Elsevier 2018 Journal of luminescence Vol.203 No.-
<P><B>Abstract</B></P> <P>A series of novel red-emitting phosphor of Li<SUB>5</SUB>La<SUB>3–3x</SUB>Eu<SUB>3x</SUB>Ti<SUB>2</SUB>O<SUB>12</SUB> (x = 0.01–0.25) were synthesized via the facile solid-state reaction method. The Rietveld refinements verified that all the samples crystallized in a garnet-like cubic structure. The band gap energy of Li<SUB>5</SUB>La<SUB>3</SUB>Ta<SUB>2</SUB>O<SUB>12</SUB> is 3.87 eV, which can be greatly narrowed by Eu<SUP>3+</SUP>-doping. This benefits the red-shift of optical absorption from UV- to near-UV light region. Importantly, the sample presents dominant absorption in near-UV (390–395 nm) and blue-light (460–465 nm) region. Li<SUB>5</SUB>La<SUB>3–3x</SUB>Eu<SUB>3x</SUB>Ta<SUB>2</SUB>O<SUB>12</SUB> (x = 0.01–0.15) has a bright red-luminescence with the strongest <SUP>5</SUP>D<SUB>0</SUB> → <SUP>7</SUP>F<SUB>2</SUB> transition at 613 nm. The energy transfer was discussed on the Eu<SUP>3+</SUP>-doping concentration. The experimental red-emitting lamps were fabricated using a 395 and a 460 nm LED-chips, respectively, in combination with the single phosphor of Li<SUB>5</SUB>La<SUB>3–3x</SUB>Eu<SUB>3x</SUB>Ta<SUB>2</SUB>O<SUB>12</SUB> (x = 0.2) driven by 2 mA current. The results indicate that the phosphor could be a promising candidate used in solid-state lightings and displays.</P>
Magnetic and Structural Properties of MnBi<SUB>1-x</SUB>Ti<SUB>x</SUB> Alloys
Suyin Zhang,Pengyue Zhang,HuanChang Jiang,Yaojun Shi,Nengjun Yu,Hongliang Ge 한국자기학회 2014 Journal of Magnetics Vol.19 No.3
MnBi1-xTix (x = 0, 0.4, 0.7, 1) alloys were prepared by arc-melting, followed by heat treatment. X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) were used to measure and investigate the phase structure and magnetic properties. The temperature dependent magnetization curves indicate that the phase transitions between LTP and HTP MnBi occur with heating or cooling in MnBi1-xTix (x ≤ 0.7) samples. However, MnTi samples are in Mn₂Ti single-phase, with very low magnetic properties. Furthermore, the coercivity exhibits a positive temperature coefficient. The results show that the optimal content of Ti for the coercivity of MnBi1-xTix alloy is x = 0.4. For MnBi sample, the coercivity reaches a maximum value of 1.13 T at 550 K. However, the remanence and energy product show apparent decrease with the addition of Ti in MnBi1-xTix alloys.
The luminescence characterization and structure of Eu<sup>2 + </sup> doped LiMgPO<sub>4</sub>
Zhang, Suyin,Huang, Yanlin,Shi, Liang,Seo, Hyo Jin IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.23
<P>An Eu<SUP>2 + </SUP>-doped LiMgPO<SUB>4</SUB> phosphor was prepared by a high temperature solid-state reaction. The formation was confirmed by x-ray powder diffraction measurements to be a single LiMgPO<SUB>4</SUB> phase. The photoluminescence excitation and emission spectra were investigated. The luminescence shows a broad emission from the <img SRC='http://ej.iop.org/images/0953-8984/22/23/235402/cm344840ieqn1.gif' ALIGN='MIDDLE' ALT='\mathrm {4f^{6}5d} \to \mathrm {4f^{7}(^{8}S_{7/2})} '/> transition at room temperature. At low temperature the zero-phonon line for transitions to the 4f<SUP>7</SUP> (<SUP>8</SUP>S<SUB>7/2</SUB>) level of the 4f<SUP>6</SUP>(<SUP>7</SUP>F<SUB><I>j</I></SUB>)5d<SUP>1</SUP> excited state is observed at 360 nm and it is found that the emission line of the <img SRC='http://ej.iop.org/images/0953-8984/22/23/235402/cm344840ieqn2.gif' ALIGN='MIDDLE' ALT='\mathrm {4f^{7}(^{6}P_{7/2})} \to \mathrm {4f^{7}(^{8}S_{7/2})} '/> transition overlaps the zero-phonon line at nearly the same position of 360 nm. The influences of temperature on the luminescence spectra and decay times were investigated. The doping mechanism of Eu<SUP>2 + </SUP> ions in LiMgPO<SUB>4</SUB> was discussed. The Eu<SUP>2 + </SUP> ions were suggested to occupy the Li<SUP> + </SUP> sites in LiMgPO<SUB>4</SUB> to induce the small crystal field splitting and weak nephelauxetic effect. </P>
Sihao Hua,Pengyue Zhang,Hangfu Yang,Suyin Zhang,Hongliang Ge 한국자기학회 2013 Journal of Magnetics Vol.18 No.1
This paper studies the effects of the Mn-site substitution by nickel on the magnetic properties and the magnetocaloric properties of La0.7Ca0.3Mn1-xNixO₃ (x = 0, 0.05 and 0.1). The orthorhombic crystal structures of the samples are confirmed by the room temperature X-ray diffraction. The dependence of the Curie temperature (TC) and the magnetic entropy change (ΔSM) on the Ni doping content was investigated. The samples with x = 0 had the first order phase transition, while the samples with x = 0.05 and 0.1 had the second order phase transition. As the concentration of Ni increased, the maximum entropy change (|ΔSM|max) decreased gradually, from 2.78 Jㆍ㎏?¹ㆍK?¹ (x = 0) to 1.02 Jㆍ㎏?¹ㆍK?¹ (x = 0.1), in a magnetic field change of 15 kOe. The measured value of TC was 185 K, 150 K and 145 K for x = 0, 0.05 and 0.1, respectively. The phase transition temperatures became wider as x increased. It indicates that the Mn-site substitution by Ni may be used to tailor the Curie temperature in La0.7Ca0.3Mn1-xNixO₃.
Sihao Hua,Pengyue Zhang,Hangfu Yang,Suyin Zhang,Hongliang Ge 한국자기학회 2013 Journal of Magnetics Vol.18 No.4
This paper studies the effects of A-site substitution by barium on the magnetic and magnetocaloric properties of Pr0.5Sr0.5-xBaxMnO₃ (x = 0, 0.04, 0.08 and 0.1). The tetragonal crystal structures of the samples are confirmed by room temperature X-ray diffraction. The dependence of the Curie temperature (TC) and the magnetic entropy change (ΔSM) on the Ba doping content has been investigated. The samples of all doping contents undergo the second order phase transition. As the concentration of Ba increased, the maximum entropy change (|ΔSM|max) increased gradually, from 1.15 J kg<SUP>?1</SUP> K<SUP>?1</SUP> (x = 0) to 1.36 J kg<SUP>?1</SUP> K<SUP>?1</SUP> (x = 0.1), in a magnetic field change of 1.5 T. The measured value of TC is 265 K, 275 K, 260 K and 250 K for x = 0, 0.04, 0.08 and 0.1, respectively. If combining these samples for magnetic refrigeration, the temperature range of ~220 K and 290 K, where |ΔSM|max is stable at ~1.27 J kg<SUP>?1</SUP> K<SUP>?1</SUP> and RCP = 88.9 Jㆍg<SUP>?1</SUP> for ΔH = 1.5 T. Pr0.5Sr0.5-xBaxMnO₃ compounds, are expected to be suitable for magnetic-refrigeration application due to these magnetic properties.