Ca3La3（BO3）5基质中Tb^3＋的光致发光

在２５４ｎｍ紫外光激发下，研究了Ｃａ３Ｌａ３（ＢＯ３）５基质中Ｔｂ＾３＋的激发光谱，发光光谱、发光寿命与Ｔｂ＾３＋的４ｆ＾８→４ｆ＾７５ｄ＾１允许迁的激发带位于２３０～２６０ｎｍ光谱区，故Ｔｂ＾３＋能很好地吸收激活能而发光，成为一种有发展前途的绿粉。Ｃｅ＾３＋可能与Ｔｂ＾３＋争夺激活能而猝灭Ｔｂ＾３＋的发光，一定量的Ｄｙ＾３＋能敏化Ｔｂ＾３＋的发光。     

Eu^3＋在（GdO）3BO3中的发光特性

研究了紫外光（ＵＶ）和阴极射线（ＣＲ）激发下（ＧｄＯ）＿３ＢＯ＿３：Ｅｕ的发光特性及其光谱随组成和结构变化的规律。在这两种激发条件下，（ＧｄＯ）＿３ＰＯ＿３中的Ｅｕ￣（３＋）均能发出明亮的红色荧光。ＣＲ激发下，在加速电压１０～２０ｋＶ、电流密度１～５μＡ／ｃｍ￣２内，Ｅｕ￣（３＋）的发光亮度与电压或电流密度之间均呈良好的线性关系，并具有耐电子束轰击的能力。根据３９５ｎｍＵＶ激发下（Ｇｄ＿（１－ｘ）ＥｕｘＯ）＿３ＢＯ＿３体系中Ｅｕ￣（３＋）的５Ｄ＿１→￣７Ｆ＿１跃迁（５３５ｎｍ）及￣５Ｄ＿ｏ→￣７Ｆ＿２跃迁（６１１ｎｍ）发射强度与Ｅｕ￣（３＋）浓度的关系，证明其浓度猝灭机理分别为电偶极－电偶极相互作用和交换作用。     

石油亚砜和P_（507）协同萃取稀土元素的研究

本文在盐酸介质中研究了石油亚砜和Ｐ（５０７）协同萃取稀土元素（Ｇｄ、Ｔｂ、Ｄｙ）的性能与机理，得出石油亚砜和Ｐ（５０７）协同萃取稀土元素Ｇｄ、Ｔｂ、Ｄｙ时有正协同效应，三者在体积比Ｖ（Ｐ（５０７））（０．５ｍｏｌ／Ｌ）／Ｖ（Ｒ２ＳＯ（１．４５ｍｏｌ／Ｌ）＝２／３时协同效应最明显；用斜率法确定萃合物的组成为ＲＥ（Ｒ２ＳＯ）２Ｐ（５０７）；研究了萃合物红外光谱图；测定了稀土的分配系数和分离系数；建立了稀土元素分配系数数学模型。     

掺Ce~（3＋）、Tb~（3＋）的四硼酸铝钇的发光特性

本文采用固相反应法合成了一系列掺Ｃｅ￣（３＋）、Ｔｂ￣（３＋）的四硼酸铝钇（Ｙ＿（１－ｘ－ｙ）Ｃｅ＿ｘＴｂ＿ｙＡｌ（ＢＯ＿３）＿４）磷光体。测定了它们的结构、属于三方晶系、空间群Ｒ＿（３２）、Ｌｎ￣（３＋）离子处于六个氧形成的三棱柱中。测定了磷光体中Ｃｅ￣（３＋）、Ｔｂ￣（３＋）和Ｃｅ￣（３＋）－Ｔｂ￣（３＋）共掺时的光谱，观察到Ｃｅ￣（３＋）、的Ｓｔｏｋｅｓ位移相当小（～１７００ｃｍ￣（－１））、Ｔｂ￣（３＋）的能级劈裂较明显和Ｃｅ￣（３＋）能将能量传递给Ｔｂ￣（３＋），测定了磷光体中Ｃｅ￣（３＋）、的荧光寿命，探讨了Ｃｅ￣（３＋）－Ｃｅ￣（３＋）之间的能量传递。     

REBO3基质中Sm^3＋的阴极射线发光特性

ＲＥＢＯ＿３基质中Ｓｍ￣（３＋）的阴极射线发光特性郭凤瑜彭夷安（北京大学１００８７１）（湖南医学专科学校）ＲＥＢＯ＿３（ＲＢ＝Ｌａ、Ｇｄ、Ｙ）是一类优良的发光材料的基质。对于ＲＥＢＯ＿３中稀土离子（如Ｃｅ￣（３＋）、Ｐｒ￣（３＋）、Ｓｍ￣（３＋）、Ｅ...     

微分脉冲极谱测定三价铬溶液中的Cr^3＋,Cr（Ⅵ）及其杂质

微分脉冲极谱法（ＤＰＰ）常用于测定三价铬电镀液中的Ｃｒ＾３＋及ＨＧＯ４＾－。以醋酸及ＫＳＣＮ作支持电解质测定Ｃ＾３，之后缩溶液重新加热还原ＨＣｒＯ４，再次用ＤＰＰ法测定总铬量，总铬量与Ｃ＾３＋量之差即为ＨＣｒＯ４之量。方法的灵敏度达到１５μｇ／Ｌ的Ｃｒ＾３＋，ＤＰＰ法用于测定Ｚｎ＾２＋，Ｎｉ＾２＋及Ｃｕ＾２＋的浓度。     

BaYB_9O_（16）中Ce_（3＋）→Dy_（3＋）的能量传递机理

本文研究了在紫外光激发下，Ｃｅ３＋、Ｄｙ３＋共掺杂的ＢａＹＢ９Ｏ１６发射光谱，激发光谱以及发光强度随组成而变化的规律。结果表明，Ｃｅ３＋对Ｄｙ３＋发光有较强的敏化作用，Ｃｅ３＋→Ｄｙ３＋的能量传递效率达９０％以上，能量传递机理为电偶极—电偶极相互作用的共振传递。     

CaTiO3：Pr^3＋的合成及发光性质

报道了稀土离子Ｐｒ＾３＋激活的ＣａＴｉＯ３发光材料的合成方法ＣａＴｉＯ３：Ｐｒ＾３＋位于６１３ｎｍ发射与Ｐｒ＾３＋离子＾１Ｄ２－＾３Ｈ４和光谱发射相一致，讨论了不同合成条件对ＣａＴｉＯ３：Ｐｒ＾３＋发光性持的影响。Ｃ     

Cl^—在Ag（SO3）^3—2溶液中的行为

对Ｃｌ＾－在Ａｇ（ＳＯ３）＾３－２溶液中的行为进行了分析，提出了亚硫酸钠分银过程中银核的形成机理。研究了银核形成的影响因素。     

高效液膜法分离富集钼（VI）与钨精矿中痕量钼的测定

用ＴＢＰ－ＴＯＰＯ（协同载体）Ｎ１１３Ｃ（表面活性剂）液体石蜡（增强剂）煤油（溶剂）和内相（１ｍｏｌ／ＬＮａＯＨ水溶液）乳状液膜体系，研究了钼（ＶＩ）的迁移富集行为，确定了用此液膜迁移分离钼（ＶＩ）的最适宜实验条件。钼（Ⅵ）在２０ｍｉｎ可迁移速率达９９．６５％以上，在同样条件下，一些共存金属离子如Ｗ＾６＋，Ｆｅ＾３＋，Ａｌ＾３＋，Ｃａ＾２＋，Ｍｇ＾２＋，Ｍｎ＾２＋，Ｐｂ＾２＋，Ｚｎ＾２＋，Ｃｕ＾２     

Improvement of Coercive Force of(CoFe)_3O_4 by Doping Ce

ＩｍｐｒｏｖｅｍｅｎｔｏｆＣｏｅｒｃｉｖｅＦｏｒｃｅｏｆ（ＣｏＦｅ）_３Ｏ_４ｂｙＤｏｐｉｎｇＣｅＸｕＨａｎｊｉａｎｇ（徐汉江）；ＣｈｅｎＪｕｎｍｉｎｇ（陈俊明）（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｌｕｒｇｙ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙ...     

Luminescent properties of Ba3Gd（BO3）3：Eu^3＋ phosphor for white LED applications

Luminescent material Ba3Gd(BO3)3 doped with Eu3+ ion was prepared by high temperature solid-state method. The preparing conditions, luminescent properties, and particle morphology of Ba3Gd(BO3)3:Eu3 + phosphor were studied with X-ray diffraction (XRD), fluorescence spectroscopy, and scanning electron microscopy (SEM). The results obtained by XRD showed that pure phase of Ba3Gd(BO3)3 was obtained at 1000℃. Images from SEM displayed that the particles of Ba3Gd(BO3)3:Eu3+ phosphor had a spherical shape with an average diameter of about 200-400 nm. The luminescence spectra showed that Ba3Gd(BO3)3:Eu3+ phosphor was effectively excited by the near ultraviolet (UV) light (396 nm) and blue light (466 nm). The main emission peaks of Ba3Gd(BO3)3:Eu3+ phosphor were assigned to the supersensitive transition 5D0-7F2 (611 and 616 nm) of Eu3+ ion when samples were excited at 255 and 396 nm, respectively, and the luminescent intensity of Ba3Gd(BO3)3:Eu3+ at 611 and 616 nm reached to the maximum when the doped content of Eu3+ ion was 10mol.%. Therefore, this phosphor could be a promising red component for possible applications in the field of white LED.     

Thermoluminescence characteristics of NaSr4（BO3）3：Ce^3＋ under β-ray irradiation

The thermoluminescence (TL) properties of Ce3+ doped NaSr4(BO3)3 phosphor under the β-ray irradiation were reported. The polycrystalline sample was synthesized by high temperature solid-state reaction. The TL glow curve of NaSr4(BO3)3:Ce3+ phosphor was com-posed of only one peak. TL kinetic parameters of NaSr4(BO3)3:Ce3+ were deduced by the peak shape method, the activation energy (E) was 0.590 eV and the frequency factor was 1.008×106s-1. TL dose response was linear in the range of measurement. The 3-dimensional (3D) TL emission spectrum was also recorded, the emission spectrum consisted of two bands located at 441 and 479 nm respectively, corresponding to the characteristic 4f05d1→2F(5/2,7/2) transitions of the Ce3+ ion. The fading behavior of the NaSr4(BO3)3:Ce3+ phosphor over a period of 15 d was also studied.     

N型(Bi_2Te_3)_(0.9)(Ag_xBi_(2-x)Se_3)_(0.1)热电材料的快速热压法制备及性能表征

采用水热法制备平均粒度约300 nm的六方相Bi2Te3纳米粉末.再以Bi2Te3粉末为原料,采用封管熔炼法制备N型(Bi2Te3)0.9(AgxBi2-xSe3)0.1(x为Ag的摩尔分数.x=0.1,0.2,0.3,0.4)合金粉体材料,通过快速热压制备N型(Bi2Te3)0.9(AgxBi2-xSe3)0.1块状热电材料.在300～550 K温度范围内研究该材料的热电性能与Ag掺杂量之间的关系,以及热压工艺对材料热电性能的影响.结果表明在775 K,40 MPa条件下烧结20 min后材料的相对密度达到97%以上,晶粒大小在3岬左右.当Ag掺杂量x=0.2时,在300 K温度下热导率达到最小值0.71 W/mK,同时获得最高的热电优值(ZT值)1.07.     

Photoluminescence of Dy~(3 ) Ions in Ba_3La(BO_3)_3

Dy3 isanimportantactivator .Ithasbeenexten sivelyappliedinmanyluminescentmaterials .Inre centyears ,someresearchershavestudiedthespec trumcharacteristicsofluminescentmaterialsdopedDy3 [1～ 6 ] andhaveobtainedsomemeaningfulre sults .InordertodevelopnewfluorescentmaterialsanddiscussthephotoluminescentruleofDy3 inthecomplexborate ,thispaperstudiesthephotolumines centcharacteristicsofDy3 inBa3La(BO3) 3host ,anddiscussestheinfluenceofthecharge to radiusratio(z/r)ofrareearthionRE3 andthecon…     

Growth and Characteristic of YbAl3(BO3)4 Crystal

YbAl3(BO3)4 crystal of good optical quality was grown by the flux method. The structure of YbAl3(BO3)4 crystal was determined by single-crystal X-ray diffraction. The experiment shows that YbAl3(BO3)4 belongs to the double borates with a trigonal structure. The space group is R32 and its unit cell constants were measured to be a=0.92965 nm, c=0.72129 nm, V=0.53673 nm3, Z=3. The transmittance spectra were measured. The cut-off of YbAl3(BO3)4 crystal is 216 nm, and there are two absorption peaks located at 940 and 975 nm from 190 nm to 2600 nm. The thermal properties of YbAl3(BO3)4 crystal were studied for the first time. The average thermal expansion coefficients were determined to be 2×10-6/℃, 9.5×10-6/℃ along a- and c- direction. The specific heat of YbAl3(BO3)4 crystal was measured to be 0.6695 J·(g·℃)-1 at room temperature. All results indicate that the YbAl3(BO3)4 crystal is an excellent stoichioimetric laser material.     

New red phosphor （Y, Gd, Lu）BO3： Eu^3＋ for PDP applications

Highly efficient phosphors under vacuum ultraviolet excitation are still demanded for the development of plasma display panels and Hg-free fluorescent lamps. The phosphors of Eu3+ doped (Y, Gd, Lu)BO3 were synthesized with solid state reaction method and the con-tents of Y3+, Gd3+, and Lu3+ for plasma display panel red phosphor were optimized under vacuum ultraviolet excitation. Two new potential candidates, which were (Y1-S-7TGdSLuT)BO3: Eu3+ (0相似文献   

Luminescence properties of YAl3(BO3)4 phosphors doped with Eu3+ ions

YAl3(BO3)4: Eu3+ phosphors were prepared by the conventional solid state reaction. The phase structure and morphology were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). Doping YAl3(BO3)4: Eu3+ phosphors with concentration of Eu3+ ions of 0, 2, 5, 8 and 10 mol% were studied and their luminescent properties at room temperature were discussed. The excitation spectrum of Y0.95Eu0.05Al3(BO3)4 was composed of a broad band centered at about 252 nm and a group of lines in the longer wavelength re-gion. In the emission spectra, the peak wavelength was about 614 nm under a 252 nm UV excitation. The optimal doping concentration of Eu<3+ ions in YAl3(BO3)4: Eu3+ phosphors was 8 mol%.     

固溶体Er_(2-x)Ho_x(WO_4)_3的热膨胀性能研究

用固相化学反应法制取了Er2-xHox(WO4)3(x=0.0～0.4,1.2～2.0)系列固溶体,利用XRD实验及Rietveld结构精修分析研究了Er2-xHox(WO4)3系列固溶体的晶体结构和热膨胀性能,结果表明Er2-xHox(WO4)3(x=0.0～0.4,1.2～2.0)系列化合物沿着三个晶向是呈异性负热膨胀性能。     

Luminescence characteristics of Ca_4YO(BO_3)_3 doped with Bi~(3+),Dy~(3+) and Pr~(3+) ions

The photoluminescence(PL) properties of Ca4YO(BO3)3 doped with Bi3+,Dy3+,and Pr3+ ions were investigated.These compounds were prepared using a typical solid-state reaction.The excitation and emission spectra were measured using a spectrofluorometer.For Ca4YO(BO3)3:Bi3+,the excitation spectrum showed the bands at about 228,309,and 370 nm which correspond to the 1S0→1P1 transition and the 1S0→3P1 transition of Bi3+ ions.The emission band at 390 nm corresponded to the 3P1→1S0 transition of Bi3+ ions.For Ca4YO(BO3)3:Bi3+,Dy3+,energy transfer occurred from Bi3+ to Dy3+ somewhat.In Ca4YO(BO3)3:Bi3+,Dy3+,Pr3+,the excitation band at 367 nm was enhanced obviously due to the energy migration from Bi3+ to Pr3+,which converted efficiently the emission of semiconductor InGaN based light-emitting diode(LED).Therefore,the emission of Dy3+ ions was enhanced due to the energy migration from the process of Bi3+→Pr3+→Dy3+.It resulted in the good color rendering.