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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>
Yanlin Zhang,Na Xu,Lei Meng 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.4
A new ratiometric fluorescence probe is constructed for the detection of rifampin (RIF). Amino-modified silicon nanoparticles (SiNPs) and mercaptoundecanoic acid capped gold nanoclusters (MUA-AuNCs) are self-assembled into nanocomposites, showing dual fluorescence emissions, respectively, at 440 and 615?nm under a single excitation of 300?nm. The morphology, surface chemistry and optical properties of the nanocomposites are finely investigated through transmission electron microscopy (TEM), Fourier transforms infrared spectroscopy (FT-IR), UV?vis absorbance, dynamic and steady state fluorescence spectroscopy. Owning to rich hydroxyl groups, RIF can bind with MUA-AuNCs though hydrogen bonds resulting in the red fluorescence quenching. But the SiNPs keep their own blue fluorescence stable, which can act as an internal reference for ratiometric detection. By means of the ratio I615/I440, the linear relationship is established in the range from 0.1 to 5 ?M with the detection limit of 0.04??M. In addition, the synchronous and asynchronous fluorescence 2D correlation maps have been created to in-depth study the relative detecting mechanism.
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>
Regeneration of PAC used for reverse osmosis concentrate treatment by wet oxidation
Yanlin Yuan,Ping Gu,Yanling Yang,Guanghui Zhang 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
The wet oxidation (WO) regeneration of powdered activated carbon (PAC) used for reverse osmosisconcentrate (ROC) treatment was studied. The exhausted PAC was regenerated at different temperaturesand times. The experimental results indicated that the optimum regeneration condition could beachieved at a temperature of 200 8C for 60 min. The mass of carbon in the solid, gas and liquid phasesbefore and after the PAC regeneration was balanced in different regeneration conditions. A molecularweight (MW) distribution of organic matter (OM) in the effluent treated by the PAC regenerated atoptimum conditions was performed.
Wenjun Zhang,Yi Chen,Yanlin Li,Sumin Guan,Yan Chen,Qian-Qian Yang,Lu Liu,Qing-Chen Xue,Yu-Cui Guang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.10
"In this work, organic–inorganic hybrid ultrathin transparent films (UTFs), produced by layer-by-layer (LBL) assembly of the europium inclusion complex of β-cyclodextrin ( β-CD) and Mg–Al layered double hydroxide (MgAl–NO3–LDHs) nanosheets, are reported. UV-visible (UV-Vis) absorption and fluorescence spectroscopy show orderly growth of the europium inclusion complex of β-CD/layered double hydroxide (EICC/LDH) films with an increasing number of deposition cycles. X-ray diffraction and scanning electron microscopy measurements indicate that the films feature periodic layered structures with uniform surface morphology. Moreover, when EICC is assembled with inorganic rigid LDH nanosheets, the lifetimes are prolonged due to the isolation effect, and the UTFs are transparent with high brightness, which indicate that these films could serve as new optical materials."