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23 个结果
  • 简介:Er~(3+)andLa~(3+)codopedY_2O_3nanocrystallinepowdersweresynthesizedbygelcombustionmethodandcharacterizedwiththermalanalysis,X-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),high-resolutionTEM(HRTEM)techniquesandfluorescencespectroscopy.Afterbeingcalcinedat1200oC,the(Y_(1–x)La_x)_2O_3:Er~(3+)powderswereconfirmedtobecubicY_2O_3phasewiththecrystallinegrainsizeintherangeof20–40nm.TheEr~(3+)emissionat1.53μmfromthe~4I_(13/2)→~4I_(15/2)transitionwasobserved,whichwasfoundtobeenhancedbyintroducingLa~(3+)ions.SuchenhancementcouldbeattributedtotheadjustmentofEr~(3+)ions'localenvironmentbythecodopingofLa~(3+)ions,leadingtotheincreasedgroundstateabsorptioncrosssectionofEr~(3+)ions.

  • 标签: POWDERS IONS crystalline CALCINED attributed cubic
  • 简介:Cr的Nanopowder:Cr的GGG和nanopowder,Nd:有从0.1at.%到1.5at.%的Cr3+的不同集中的GGG被大音阶的第五音胶化方法用醋酸和乙烯乙二醇综合。热gravimetric分析和微分扫描热量测定(TGA-DSC),X光检查衍射(XRD)和光致发光光谱学被用来描绘粉末。当在1000点对待时,雏晶尺寸是大约58nm?????????????????猯灵?匠?猼'T资???猼灵?????????猯'T??猼灵???? ̄?????猯'T????猯灵??猼'T?????吗????????????????‵渠????????浮??

  • 标签: NANOPOWDER Cr, Nd : GGG 大音阶的第五音胶化 荧光一生 精力转移效率 稀土元素
  • 简介:YPO_4phosphorssingle-dopedwithSb~(3+)orGd~(3+)andco-dopedwithSb~(3+)andGd~(3+)werepreparedbyasolid-statereactionmethod.Thephasepurity,morphology,photoluminescenceexcitationandemissionpropertiesofthepreparedphosphorswereinvestigated.TheresultsshowedthatSb~(3+)couldsensitizeGd~(3+)intheco-dopedphosphorswhichmadethephosphorsexcitablebyshort-waveultraviolet(UV)atawavelengthbetween220and260nm.Under253.7nmexcitation,theco-dopedphosphorsY_(1–x–y)PO_4:Sb~(3+)x,Gd~(3+)yshowedstrongemissionofGd~(3+)atawavelengthof312nmwhoseintensitychangedwiththedopingconcentrationsofGd~(3+)andSb~(3+).TheoptimizedY_(0.77)PO_4:Sb~(3+)0.07,Gd~(3+)0.16phosphorshowedanintensitycomparabletocommercialLaPO_4:Cephosphor(UVB-315),makingitapotentialcandidateformercurylow-pressuredischargenarrow-bandUV-Bemittinglamps.

  • 标签: PHOSPHOR narrow ultraviolet doping excitation CALCINATION
  • 简介:ThesurfaceofacommercialY3Al5O12:Ce3+phosphorwasmodifiedby99%NH4F+CH3COOHsolutioninasupersonicbathwithwatertemperatureof80oCfor4h.Thescanningelectronmicroscopy(SEM)resultsshowedthattheedgeangleswerenotassharpastheunmodifiedparticlesandtheflatsurfacesturnedroughwithmanymicro-structurescovered.Positronlifetimemeasurementsquantitativelyshowedthatsurfacedefectswereremovedawaybymorethan50%.Asaresult,thephotoluminescencedeterminationsshowedthatthebackscatterlosswasreducedby4.2%andtheemissionpowerwasenhancedby5.6%afterthesurfacemodification.Theconversionefficiencywasgreatlyimprovedfrom47.3%to51.1%,aspresentedbythefluorescenceimages.Therefore,itwouldbegreatlyhelpfulfortheimprovementofefficiency,transparencyandstabilityofpc-LED.Moreover,thismethodwassignificantlysuitableformassproductionduetoitseasyoperationandlowcost.

  • 标签: 表面特征 表面缺陷 溶胶-凝胶法 荧光粉 选择性腐蚀 CE
  • 简介:AdetailedstudyofthefluorescenceemissionpropertiesandenergytransfermechanisminEr3+/Tm3+co-dopedleadsilicateglasseswasreported.Enhancednearinfrared1.8μmandvisibleup-conversionemissionswereinvestigatedunder808and980nmexcitations,respectively.TheenergytransfermechanismbetweenEr3+andTm3+wasanalyzedaccordingtotheabsorptionspectra,theemissionspectraandthelevelstructuresofEr3+andTm3+.TheenergytransferefficiencybetweenEr3+andTm3+reached68.1%intheEr3+/Tm3+co-dopedleadsilicateglasseswhenpumpedby808nmlaserdiode.Basedontheabsorptionspectra,theJudd-Ofeltparameters,spontaneousemissionprobability,absorptionandemissioncrosssections,gaincoefficientswerecalculatedandanalyzed.Itwasfoundthatthecalculatedemissioncrosssectionandthemaximumgaincoefficientaround1.8μmwere4.9×10–21cm2and1.12cm–1,respectively.TheseresultsindicatedthattheEr3+/Tm3+co-dopedlead-silicateglasseshadpotentialapplicationinnearinfraredlasers.

  • 标签: 硅酸铅玻璃 近红外激光 发射特性 激发条件 共掺杂 TM
  • 简介:单斜晶、六角形的LaPO4:5mol.%Eu3+黄磷与仅仅在一样的合成温度由一个热水的方法调整答案的pH价值被综合。被不同准备影响的Eu3+-dopedLaPO4,的微观结构,形态学和光致发光调节,被X光检查衍射(XRD)描绘,扫描电子显微镜学(SEM),Fourier变换红外线的光谱学(英尺红外),拉曼光谱学和光光谱学分别地。然而,标本在强壮的酸答案显示出单斜晶的结构它在弱酸答案和强壮的碱答案变成了六角形的结构。单斜晶的LaPO4:Eu3+显示出最长的长度到直径比率,它被归因于优先的生长[-112]。单斜晶的标本与六角形的标本相比在红外线的系列,拉曼乐队位置和费用转移(CT)展出了细微红移动。而且,谷物尺寸的计算结果,格子参数,在在拉曼模式和排放积分紧张的半最大值的完整的宽度在对分析结果的好同意。单斜晶的标本显示出最大的绝对的光量收益(0.4)和第二一生2(0.52ms),它与在CIE的红橘子的排放是一致的。5D07F1在六角形的标本占据了一个dominate位置,它显示在六角形的结构的更多的Eu3+被占据对称地点的倒置中心。

  • 标签: LaPO 4:Eu3+ 震动 光致发光 微观结构 稀土元素
  • 简介:Trivalentsamariumdopedbariummolybdate(BaMoO_4:Sm~(3+))redphosphorwassuccessfullysynthesizedbyhydrothermalmethod.Thecrystalstructure,morphologyandphotoluminescentpropertywerecharacterizedbyX-raydiffraction,fieldenvironmentalscanningelectronmicroscopyandphotoluminescencespectroscopy.TheresultsindicatedthatthesynthesizedBaMoO_4:Sm~(3+)phosphorconsistedofapurephasewithanoctahedralstructure.Themainexcitationpeakswerelocatedat362,404,445and477nm,respectively,andwereobviouslyobserved.Themainemissionpeakswerelocatedat533,566,602and646nm,respectively.Thephosphorsexhibitedaredperformanceat646nm,whichwasappropriatefortheultraviolet-lightemittingdiode(UV-LED)andblueLED.TheluminescentintensityofBaMoO_4:Sm~(3+)increasedwithanincreaseinthedopingamountofSm~(3+).Theluminescentintensityhadtheoptimalvalueforx=0.03.WhenthedopingamountofSm~(3+)wasfurtherincreased,theconcentrationquenchingphenomenonwasobserved.Monovalentlithium(Li+)cationwasusedasachargecompensator.TheluminescenceintensityfirstincreasedwithincreasingLi+dopingconcentration,andthendecreased.TheoptimalcontentofLi+wasabout2%.TheBaMoO_4:Sm~(3+)phosphorpreparedinthisstudycouldactassuperiorredphosphorforwhiteLEDs.

  • 标签: LUMINESCENT PHOSPHOR doping hydrothermal ultraviolet luminescence
  • 简介:TheNaGd(WO_4)_2:Eu~(3+)phosphorswerepreparedbythemicroemulsionmediatedhydrothermalmethod.ThemorphologyandsizeofthesamplescouldbedependentonthepHintheinitialsolution.Thesephosphorsobtainedhadastrongabsorptionat395nmmatchingwiththepopularemissionofnear-UVLEDchips,andcouldemitintenseredlightat616nm.Thesmallellipsoid-likeparticlesorshortrodswereprovidedwithlargeparametersofoscillatorstrength?_2andasymmetryratio.Comparedtotheellipsoid-likephosphors,therod-likephosphorstookonstrongeremission,longerlifetimeandlargerquantumefficiency.Thisworkdemonstratedthattheone-dimensionNaGd(WO_4)_2:Eu~(3+)phosphorsmightbeamorefavorabledevicethanzero-dimensiononesforphotoluminescence.

  • 标签: MICROEMULSION hydrothermal oscillator matching LIFETIME sizes
  • 简介:Whitelight-emittingYVO_4:1mol.%Dy~(3+),xmol.%Eu~(3+)phosphorpowderswithordermorphologyandwellcrystallizationwerehydrothermallysynthesizedat180°C.Themicrostructure,white-lightemission,andlight-emittingmechanismofthepowderswerecarefullystudiedusingX-raydiffractometry,scanningelectronmicroscopyandphotoluminescencespectra.TheexcitationandemissionspectraofthephosphorpowdersindicatedthecoexistenceofefficientenergytransferfromEu~(3+)toDy~(3+)andinefficientenergytransferfromDy~(3+)toEu~(3+)besidestheenergytransferfromVO_4~(3–)toEu~(3+).IncreasingtheEu~(~(3+))concentrationinitiallyenhancedandthenweakenedtheluminescentintensityofDy~(3+).Thewhite-lightemissionsofYVO_4:1mol.%Dy~(3+),xmol.%Eu~(3+)phosphorpowderswerebothrelatedtotheenergytransferbetweenVO_4~(3–)andDy~(3+)/Eu~(3+),aswellasbetweenEu~(3+)andDy~(3+).TheinefficientenergytransferfromDy~(3+)toEu~(3+)wasfirstfound.

  • 标签: POWDERS PHOSPHOR DIFFRACTOMETRY coexistence luminescent excitation
  • 简介:YbF2.357,YbF3,Ba2YbF7,andBa2upconversionnanocrystalsdopedwithemitterEr3+ionweresynthesizedinthesamesolventsystemjustwithchangingthemolarratioofBa2+toYb3+intheprecursor,whichcorresponedtothecrystalphasesofrhombohedral,orthorhombic,tetragonal,andcubic,respectively.Allthesamplesemittedboth660nmredlightand543/523nmgreenlightwhichoriginatedfromEr3+-4fnelectronictransitions4F9/2-4I15/2and4S3/2/2H11/2-4I15/2,respectively.ItwasworthmentioningthatYbF3:Er3+,Ba2YbF7:Er3+,andBaF2:Er3+couldemitdazzlinglybrightlightevenundertheexcitationofa980nmCWlaserwithoutputpowerof0.1W.Upconversionemissionmechanismanalysisindicatedthattheintensityratioofredtogreenlighthighlydependedonthesynergisticeffectofcrystalstructure,concentrationquenching,andparticlesize,butwerenotsensitivetocrystallinityaspreviouslyreportedforNaLnF4(Ln=lanthanide).

  • 标签: 上转换发光 晶体结构 光致发光 浓度猝灭 纳米晶 协同效应
  • 简介:介绍了160m^3WEMCO和Dorr—oliver浮选机的使用状况及故障处理方法,为浮选机的使用与维护积累了经验。

  • 标签: 浮选机 速度椎体 导流管
  • 简介:增加的CeO2(ZrO2)/TiO2催化剂独立由大音阶的第五音胶化和受精的方法准备了的一系列镨为选择催化减小被测试没有,并且由X光检查衍射(XRD)描绘了,N2-brumauer-emmett-teller(N2-BET),NH3-temperature规划了解吸附作用(NH3-TPD),H2-temperature规划了减小(H2-TPR),PL系列,拉曼系列,电子顺磁的回声(EPR)一催化性能上的准备方法的影响被学习。结果证明CeO2(ZrO2)/TiO2催化剂的催化性能上的Pr增加的影响在大音阶的第五音胶化方法和受精方法之间是不同的。Pr增加趋于与TiO2交往并且当它是更可能的与在受精方法形成Ce-O-Pr的结构的CeO2交往时,在大音阶的第五音胶化方法形成了Ti-O-Pr的结构。大音阶的第五音胶化方法准备的催化剂的全部的酸数量和氧化还原作用性质与Pr元素的增加减少了,它导致了催化活动的减少。相反,受精方法准备的增加Pr的催化剂被发现拥有更容易的reducibility,更多的全部的酸数量和Ce3+种类的更高的比例,它为更高催化的活动是赞成的。

  • 标签: 增加镨 CeO 2(ZrO2)/TiO2 准备方法 选择催化减小 催化性能 稀土元素
  • 简介:四lanthanide协作建筑群,也就是[行(2,3-DClBA)3(5,5-dmebipy)(H2O)]2(Ln=Sm(1),Eu(2),Dy(3),惊讶(4));2,3-DClBA=2,3-dichlorobenzoate;5,5-dmebipy=5,5-dmethylbipyridine)被元素的分析,红外线的光谱学和单个水晶X光检查衍射综合并且描绘。调查结果显示建筑群3是一个dinuclear分子,并且中心Dy3+是八坐标的。每个dinuclear单位能被H债券和卤素卤素相互作用连接。建筑群2的光性质建议了Eu3+离子的典型强烈排出物。热分析证明建筑群在分解了步:协作水然后第一被失去中立ligand5,5dmebipy被失去,最后,2,3-DClBAligand被失去。

  • 标签: lanthanide 建筑群 水晶结构 超分子 H 债券 卤素卤素相互作用 光性质
  • 简介:通过制作两个固-液扩散偶,并通过实验探索700℃下Fe-Zn-Sn系中不同成分制备平衡合金的方法,利用SEM-EDS等手段测定Fe-Zn-Sn元系700℃等温截面部分相关系。实验结果显示:这部分相图是由L、α(Fe)、Γ个单相区,L+α(Fe)、FeSn+Fe3Sn2、Γ+Fe3Sn2、L+FeSn、L+Γ、α(Fe)+Γ六个两相区,α(Fe)+L+Γ、α(Fe)+L+Γ、L+FeSn+Fe3Sn2相区组成的;锡含量在一定范围内,锡含量的增加导致镀层厚度减少。

  • 标签: Fe-Zn-Sn 等温截面 相图 热浸镀锌
  • 简介:采用超音速等离子喷涂法在1045钢表面制备NiCr-Cr3C2涂层,分析涂层的微观结构及化学成分以及涂层的晶粒结构,利用MICROMET-6030显微硬度仪和Nano-test600纳米压痕仪测定涂层的显微硬度与弹性模量,通过油润滑微动摩擦磨损试验测试涂层的微动磨损性能。结果表明,NiCr-Cr3C2涂层为明显的层状结构,具有单晶、纳米多晶与过渡区共存的复杂晶体学结构,显微硬度HV0.3高达998,约为基体材料硬度的3倍,弹性模量为224.6GPa;涂层的微动摩擦因数随载荷增大而减小,随温度升高而增大。喷涂层的抗微动摩擦磨损性能较基体优异,摩擦因数及体积磨损量分别比基体降低36.7%和55.6%。涂层的磨损机理以磨粒磨损和疲劳剥落为主。

  • 标签: 超音速等离子喷涂 NiCr-Cr3C2涂层 微观结构 微动磨损 硬度
  • 简介:本文研究了种块矿的冶金性能,结果得出:块矿C的还原度及高温软熔性能指标不及块矿A和块矿B,为改善其还原度,提出适度降低块矿C的入炉粒度。此外,针对种块矿的软熔性能整体偏差的特性,提出将块矿与烧结矿混搭入炉的建议。

  • 标签: 块矿 爆裂性能 还原度 高温软熔性能
  • 简介:本文就影响损失率和贫化率的主要因素进行了探讨,就如何降低采矿损失率及贫化率提出具体措施,目的是有效地降低“两率”,提高矿山企业的经济效益。

  • 标签: 采场 损失率 贫化率 改进措施
  • 简介:结合实例介绍了PDMS数据库建立、土建建模、设备建模、管道建模、出图、材料统计及漫游模拟等各阶段的工作内容及流程。实践表明,PDMS软件在维设计、材料统计和虚拟漫游方面具有明显优势,可以有效提高设计质量和工作效率。

  • 标签: 三维设计 PDMS 氧化铝 设计应用
  • 简介:利用火焰原子吸收光谱(FAAS)分析技术,对测定锑和氧化二锑中微量碲的基体和共存元素干扰、仪器分析参数等因素进行了研究,确定了最佳分析条件。试验结果表明:该方法准确、可靠、适用。方法的检出限0.138μg/mL,相对标准偏差小于6%,回收率为96%~101%。

  • 标签: 火焰原子吸收光谱法 三氧化二锑