Synthesis and Structure of Polynuclear Complex [La(bphsb)2(NO3)3]n

Ｓｏｍｅｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｗｉｔｈｄｉｓｕｌｆｏｘｉｄｅｓｈａｖｅｂｅｅｎｓｔｕｄｉｅｄ［１，２］．Ｈｏｗｅｖｅｒ，ｒｅｌａｔｉｖｅｌｙｌｉｔｌｅｗｏｒｋｈａｓｂｅｅｎｄｏｎｅｏｎｃｒｙｓｔａｌｓｔｒｕｃｔｕｒｅｏｆｔｈｅｓｅｃｏ...     

Crystal Structure and Luminescence of 1,10-Phenanthroline-tris (4-methoxybenzoato)Europium

ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅａｎｄＬｕｍｉｎｅｓｃｅｎｃｅｏｆ１，１０Ｐｈｅｎａｎｔｈｒｏｌｉｎｅｔｒｉｓ（４ｍｅｔｈｏｘｙｂｅｎｚｏａｔｏ）ＥｕｒｏｐｉｕｍＷａｎｇＲｕｉｆｅｎ（王瑞芬），ＬｉＬｉｎｓｈｕ（李林书）（Ｄｅｐａｒｔｍｅｎｔ...     

Crystal Growth and Laser Characteristics of Nd~(3+)∶KGd(WO_4)_2

The solid-state diode-pumped laser was widelyusedin many fields.With the development of crystalgrowth,many good working materials were discov-ered,such as:Nd3+∶YAG,YVO4[1],YLF[2,3],andNd3+∶KY(WO4)2(Nd∶KYW),Yb3+∶KY(WO4)2(Yb∶KYW),Nd3+∶KGd(WO4)2(Nd∶KGW)in recent10years.Compared with Nd∶YAG,Nd∶KGWhas manyoutstanding properties:the emission cross section isbig at the output wavelength of1064and1351nm,concentrate quenching of high Nd3+(at a maxi mumof10%)(atomfraction)is v…     

Preparation and Characterization of Red Luminescent Ca_(0.8)Zn_(0.2)TiO_3∶ Pr~(3+), Na~+ Nanophosphor

Pr dopedalkalineearthmetaltitanateswithper ovskitestructurehaverecentlybeenthesubjectof manyinvestigations.Thisisbecauseoftheirhigh chemicalstability,strongandsharpredemission,and longafterglowluminescence[1～13].CaTiO3∶Pr3+,asa relativelynewluminescencematerialofthatcategory,andexhibitsredcathodoluminescencelocatedatthe CIEcoordinate[8]ofx=0.680andy=0.311,very closeto“idealred”ofNTSC(NationalTelevision StandardsCommittee).Inaddition,itisapromising redlongpersistencephosphor,whichmayp…     

Synthesis of Phosphors(Ce0.67Tb0.33)MgAl11O19 and BaMgAl10O17:Eu2+ by Microwave Irradiation Technique and Their Luminescent Properties

The phosphors(Ce0.67Tb0.33)MgAl11O19(P-G) and BaMgAl10O17∶Eu2+(P-B) have been synthesized using the microwave irradiation technique. The data of X-ray powder diffraction(d-values and I/I0-values) are basically coincided with the data of JCPDF 36-73 and 26-163 cards. The calculated cell dimensions are a=0.5582 nm, c=2.1884 nm for P-G, and a=0.5616 nm, c=2.2614 nm for P-B. The excitation spectra and the emission spectra of the phosphors were measured. The chromatic coordinates are x=0.316, y=0.565 for P-G, and x=0.156, y=0.106 for P-B. The relative luminescent intensity is about 88%(P-G) and 80%(P-B), respectively, compared with the same commercial phosphors. The phosphors were also detected by scanning election microscope.     

Synthesis and Fluorescence of Tb~(3 ) and Eu~(3 ) Complexes with N, N', N

ＳｙｎｔｈｅｓｉｓａｎｄＦｌｕｏｒｅｓｃｅｎｃｅｏｆＴｂ~（３＋）ａｎｄＥｕ~（３＋）ＣｏｍｐｌｅｘｅｓｗｉｔｈＮ，Ｎ＇，Ｎ＂－１，３，５－ｔｒｉａｚｉｎｅ－２，４，６－ｔｒｉｙｌｔｒｉｓ－［Ｎ－（ｃａｒｂｏｘｙｍｅｔｈｙｌ）］－ｇｌｙｃｉｎｅ￥Ｇｏｎ...     

Spectral Parameters of Nd~(3+)∶Sr_6YSc(BO_3)_6

Ｉｎｒｅｃｅｎｔｙｅａｒｓ ,ｒｅｓｅａｒｃｈｏｎｎｅｗｍａｔｅｒｉａｌｓｗｉｔｈｉｍｐｒｏｖｅｄｓｐｅｃｔｒａｌｐｒｏｐｅｒｔｉｅｓｆｏｒｄｉｏｄｅｐｕｍｐｉｎｇｉｓｏｆｉｎｃｒｅａｓｉｎｇｉｎｔｅｒｅｓｔ ,ｓｉｎｃｅｄｉｏｄｅ ｌａｓｅｒｐｕｍｐｅｄｓｏｌｉｄ ｓｔａｔｅｌａｓｅｒｓｈａｖｅｂｅｅｎｆｏｕｎｄｉｎａｗｉｄｅｖａｒｉｅｔｙｏｆａｐｐｌｉ ｃａｔｉｏｎｓｉｎｔｈｅｆｉｅｌｄｓｏｆｍｉｌｉｔａｒｙ ,ｉｎｄｕｓｔｒｙ ,ｍｅｄｉｃａｌｔｒｅａｔｍｅｎｔａｎｄｓｃｉｅｎｔｉｆｉｃｒｅｓｅａｒ…     

(Zn,Ca) Solid-Solution Behavior and Its Effect on Luminescence Properties in Ca_(1-x)Zn_xTiO_3∶0.002Pr~(3 ) Phosphors

Compared withthe classical sulfides MS∶Eu2 (M=Ca,Sr,Ba)red phosphor and ZnS∶Eu2 greenphosphor,the alkali-earth aluminate phosphors havesuperior blue-green long afterglowproperties,such asblue phosphors CaAl2O4∶(Eu2 ,Nd3 ),green phos-phor SrAl2O4∶(Eu2 …     

Synthesis, X-ray structure and luminescent properties of Sm~(3+) ternary complex with novel heterocyclic β-diketone and 1,10-phenanthroline (Phen)

A new neutral ternary samarium complex Sm(Phen)HL3 in which Phen is 1,10-phenanthroline and HL is (1,3-bis(1,3-dimethyl-1H-pyrazol-4-yl)-1,3-propanedione) was synthesized. Molecular structure of this complex was determined by X-ray diffraction. Under UV-light this complex is demonstrated bright red luminescence (λmax=647 nm), which was corresponding to the electric dipole 4G5/2→6H9/2 transition in Sm3+ ion. UV-absorption, excitation and emission spectra of the title compound were investigated.     

Growth and Spectral Properties of Crystal Er~(3 )∶Y_(0.5)Gd_(0.5)VO_4

Er∶YVO4andEr∶GdVO4lasercrystalshavebeen widelystudiedandusedinlaser diodepumpedsolid statelasersfortheirgoodlaserproperties[1～4].Howev er,thethermalconductivityofEr∶YVO4crystalislow andthecrystaliseasytodecompose.ThoughEr∶GdVO4lasercrystalhasanexcell     

Study on VUV and UV Excitation Spectrum of GdVO_4∶Eu~( 3 )

Ｔｈｅｍｅｒｃｕｒｙ ｆｒｅｅｆｌｕｏｒｅｓｃｅｎｔｔｕｂｅｓａｎｄｐｌａｓｍａｄｉｓｐｌａｙｐａｎｅｌｓｈａｖｅｕｒｇｅｎｔｒｅｑｕｉｒｅｍｅｎｔｔｏｔｈｅｈｉｇｈｌｙｅｆｆｉｃｉｅｎｔａｎｄｓｔａｂｌｅｐｈｏｓｐｈｏｒｆｏｒｅｘｃｉｔａｔｉｏｎｉｎｔｈｅｕｌｔｒａｖｉｏｌｅｔｓｐｅｃｔｒａｌｒｅｇｉｏｎ(ＶＵＶ ,Ｅ >50 0 0ｃｍ-1,λ <2 0 0ｎｍ ) .Ｔｈｅｘｅｎｏｎｄｉｍｅｒｄｉｓｃｈａｒｇｅｉｎｈｉｇｈｐｒｅｓｓｕｒｅｇｉｖｅｓｔｈｅｈｉｇｈｅｓｔｅｆｆｉｃｉｅｎｃｙｏｆａｌｌｎｏｂｌｅｇａｓｅ…     

Synthesis and Structural Characterization of a Novel Two-Dimensional Heterometallic Coordination Polymer Nd_2Zn_3(EDTA)_3(H_2O)_( 11)·12H_2O

Ｔｈｅｍａｇｎｅｔｉｃｐｒｏｐｅｒｔｉｅｓｏｆｈｅｔｅｒｏｐｏｌｙｎｕ ｃｌｅａｒｃｏｍｐｌｅｘｅｓｃｏｎｔａｉｎｉｎｇｂｏｔｈ 4ｆａｎｄ 3ｄｉｏｎｓｈａｖｅａｔｔｒａｃｔｅｄｃｏｎｓｉｄｅｒａｂｌｅｉｎｔｅｒｅｓｔｓｓｉｎｃｅ1 985 [1] .Ｃａｒｂｏｘｙｌｉｃａｃｉｄｉｓａｋｉｎｄｏｆｐｏｔｅｎｔｉａｌｌｉｇａｎｄｆｏｒｔｈｅｄｅｓｉｇｎａｎｄｓｙｎｔｈｅｓｉｓｏｆｔｈｉｓｋｉｎｄｏｆｍａｇｎｅｔｉｃｍｏｌｅｃｕｌａｒｍａｔｅｒｉａｌｓ .Ｓｏｍｅｃａｒ ｂｏｘｙｌａｔｅｃｏｍｐｏｕｎｄｓｗｅｒｅｐ…     

Microwave assisted synthesis, spectroscopy and biochemical aspects of lanthanum(Ⅲ) and praseodymium(Ⅲ) complexes with oxadiazole functionalised dithiocarbazinates

The new lanthanum (Ⅲ) and praseodymium (Ⅲ) complexes of the general formula [Ln(L)3] (Ln=La(Ⅲ) or Pr(Ⅲ); LK=potassium salt of dithiocarbazinates) were prepared by both, conventional thermal and by the use of microwave technology. Elemental analyses, elec-trical conductance, magnetic moment and electronic, infrared, far-infrared, 1H and 13C NMR spectral studies were used to characterize the complexes. The molecular weights of few complexes were determined by FAB-mass spectra. Nephelauxetic ratio, covalency parameter and bonding parameter for these complexes were also calculated. The probable structures of the complexes were proposed. The antifungal and antibacterial activities of the complexes were evaluated. The activities were correlated with the structures of the compounds.     

Synthesis of ordered mesoporous γ-Al_2O_3:Eu~(3+) with high luminous performance and thermal stability

An efficient and convenient one-step process was developed for synthesizing new effective red luminous materials through ordered mesoporous γ-alumina assembling with Eu3+. Employing P123 as a structure-directing agent and hydrochloric acid, citric acid as pH adjustor, ordered mesoporous γ-alumina was fabricated by simple sol-gel method. The pore structure was characterized by X-ray diffraction (XRD), N2 adsorption-desorption isotherms and transmission electron microscopy (TEM). The as-synthesized γ-aluminas...     

Effect of samarium doped ceria nanoparticles impregnation on the performance of anode supported SOFC with(Pr_(0.7)Ca_(0.3))_(0.9)MnO_(3-δ) cathode

Solid oxide fuel cell(SOFC) electrodes,after a high temperature sintering,may be impregnated to deposit nanoparticles within their pores to enhance the catalytic function.Samarium doped CeO2(SDC) nanoparticles were infiltrated into(Pr0.7Ca0.3)0.9MnO3-δ(PCM) cathode of anode supported SOFC cells.The cell with 2.6 mg/cm2 SDC impregnated in cathode showed the maximum power density of 580 mW/cm2 compared with 310 mW/cm2 of the cell without impregnation at 850 °C.The cells were also characterized with the impedance spectra,and the SDC impregnation significantly reduced the polarization resistance.After performance test the cells were characterized with scanning electron microscopy(SEM),and the cathode morphology showed the impregnated SDC particles were nanosized and were deposited on the surface of the PCM framework.The possible mechanism for the performance improvement was discussed.     

Synthesis, structure and photoluminescent properties of a new Eu(Ⅲ) complex with 5-bromoisophthalic acid

The self-assembly of 5-bromoisophthalic acid (H2BIPA) with Eu(NO3)3·6H2O under the hydrothermal conditions gave a 3D coordination polymer, Eu2(BIPA)3(CH3CH2OH) (1), which was characterized by elemental analysis, IR and single-crystal X-ray diffraction. Complex 1 displayed an unusual three-dimensional network of a rare (4,6)-connected (48.66.8)2(44.62)2(42.84) topology, which was different from Eu2(BDC)3(H2O)2 (BDC=isophthalate), because the -Br substituent of the isophthalate resulted in the different electronic effects and the steric hindrance to change the coordination modes of carboxylate groups in the assembled process. Moreover, the luminescent properties of 1 were also investigated in the solid state.     

Multi-site occupancies and luminescence properties of cyan-emitting Ca9-xNaGd2/3(PO4)7:Eu2+phosphors for white light-emitting diodes

Cyan-emitting Ca₉NaGd_2/3(PO₄)₇:Eu²⁺phosphors were synthesized via high temperature solid-state route.X-ray powder diffraction(XRD)and scanning electron microscopy(SEM)were used to verify the phase and morphology of the Ca₉NaGd_2/3(PO₄)₇:Eu²⁺(CNGP:Eu²⁺)phosphors.The as-obtained phosphor exhibits a broad excitation band of 250-420 nm,which is near the ultraviolet region.An intense asymmetric cyan emission at 496 nm corresponds to the 5 d-4 f transition of Eu²⁺.The multiplesite luminescent properties of Eu²⁺ions in CNGP benefit from versatile structure ofβ-Ca3(PO4)2 compounds.The effective energy transfer distance is 5.46 nm(through the spectral overlap calculation),validating that the resonant energy migration type is via dipole-dipole interaction mechanism.Compared to the initial one at room temperature,the luminescent intensity of CNGP:Eu²⁺phosphor can maintain 77%as it is heated up to 420 K.A white light-emitting diode(WLED)with excellent luminesce nt properties was successfully fabricated.Moreover,the CIE chromaticity coordinates of fabricated WLED driven by changing current just change slightly.     

Synthesis, Structure and Fluorescence Properties of Tb(Ⅲ) Complex with Isonicotinic Acid and Biphenyl-2,2′-Dicarboxylic Acid

Photoluminescenceofrareearthcomplexesisin nerf-ftransitionsofthecentralions,whichhasgood monochromaticity.Rareearthionsareeasytoreact withcarboxylicacidstoformstablecomplexes,and manykindsofaromaticacidscanenhancethefluores centluminance.Considerableeffor…     

Preparation and thermoelectric properties of ternary rare earth sulfide γ-Ce_(3–x)Eu_xS_4

The effect of Eu-substitution on the density and thermoelectric properties of ternary sulfide Ce3–xEuxS4 (0≤x≤0.8) compacts was investigated. Ce3–xEuxS4 powders were prepared via the sulfurization of the oxide using CS2 gas at 1473 K. The pressureless sintered Ce3–xEuxS4 compacts in the atmosphere were crystallized in the γ-phase. The density of the Ce3–xEuxS4 compacts increased with the increas-ing of Eu-substitution. Eu-substitution yielded a higher Seebeck coefficient and lower electrical resistivity. The highest value of the thermoe-lectric power factor of 1.41×10–4 W/K2m was obtained for the Ce2.2Eu0.8S4 compact at 673 K. It indicated that Eu-substitution was effective for improving thermoelectric properties of Ce3–xEuxS4.     

Luminescence and Defect Properties of Novel Bluish-Green Phosphor β-Zn_3(PO_4)_2∶Zr~(4 )

Duringlastdecade ,manyresearchershaveshowngreatinterestinluminescencepropertiesofcompoundscontainingM4 ions (M =Ti ,ZrandHf)withtheclosed shell (nd0 )becausetheyhavemorepracticalandpotentialapplications ,suchasphosphorusedinX rayintensifyingscreenandapromisingmaterialap pliedinfracturedetectionsystemofstructureceramicsinthefieldofengineeringmaterials[1,2 ] .Theopticaltransitionsinthesecompoundsareoftheligand -to -metalchargetransfer (LMCT)type .WithinthemtheZr4 -O2 chargetransfertran…