杂化材料Eu（Phen）_2Cl_3/MCM-48的荧光性能及热稳定性

采用超声波辅助.溶液浸渍法将稀土配合物Eu(Phen)2Cl3装入中孔分子筛MCM-48孔道.合成了不同组装量的杂化材料Eu(Phen)2Cl3/MCM-48.运用XRD、ICP、N2吸附-脱附、DTA-TG、TEM、荧光光谱等手段对杂化材料进行了表征,研究表明稀土配合物已进入分子筛孔道,且随着配合物嵌入量的增加.杂化材料的荧光发射也逐渐增强.经ICP分析得出Eu(Phen)2Cl3在MCM-48中的饱和吸附量为8.6%,此时荧光强度最大.与纯稀土配合物Eu(Phen)2Cl3相比,Eu(Phen)2Cl3/MCM-48的热稳定性提高了约200℃.     

羧酸类大分子稀土配合物的合成、表征及性能研究

通过先聚合再配合的方法成功制备了两种羧酸类大分子稀土铕配合物PAA-Eu和ST-AA-Eu,并将其与合成的小分子稀土配合物Eu(AA)3形成对比。经红外光谱初步表征发现稀土配合物已经配位成功且其配位数为6。分别采用凝胶渗透色谱(GPC)和等离子发射光谱(ICP)分析大分子稀土配合物的分子量与稀土铕的含量。由TG分析配合物的分解温度并了解其热稳定性能和组分,采用荧光激发发射光谱研究其荧光性能,采用SEM分析配合物与基质的相容性。结果表明,大分子稀土配合物的热稳定性稍差于小分子稀土配合物,其中ST-AA-Eu由于苯环的介入热稳定性能稍好。小分子稀土配合物Eu(AA)3的荧光强度明显要比大分子稀土配合物强,大分子稀土配合物PAA-Eu的荧光强度比ST-AA-Eu强,配合物都发红光;大分子稀土配合物与基质的相容性比小分子稀土配合物好。     

稀土配合物/改性MCM-41杂化发光材料的合成研究

采用水热法合成了改性MCM-41中孔分子筛;采用液相沉淀法合成了Eu(Phen)2(Pht)2Cl.H2O和Eu(Phen)2(Sal)(Pht)Cl.H2O两种稀土有机配合物。并将所制备的稀土有机配合物组装到改性MCM-41中,合成了稀土配合物(铕)/改性MCM-41杂化发光材料,采用小角XRD、红外光谱、荧光光谱和TEM、N2吸附-脱附对其结构和荧光性质进行了研究。结果表明,组装体具有MCM-41典型结构并且在组装之后仍保留了MCM-41的孔道结构;其荧光光谱具有Eu3+的特征荧光发射,发光强度大于纯配合物,更有利于实际应用。     

Eu-PMMA-SA光功能杂化材料的制备与表征

利用甲基丙烯酸甲酯（MMA）、水杨酸（SA）与硝酸铕（Eu（NO3）3）反应,合成了Eu-MMA-SA三元稀土配合物,然后以此铕配合物为单体,以偶氮二异丁腈（AIBN）为引发剂,在一定条件下进行聚合反应,制备铕-聚甲基丙烯酸甲酯-水杨酸（Eu-PMMA-SA）无机-高分子多元光功能杂化材料,红外光谱（FT-IR）分析结...     

水杨酸铽/聚乙烯醇杂化光功能材料的制备和性能

采用溶胶/凝胶方法制备了一系列含有铽-水杨酸配合物的聚乙烯醇高分子杂化光功能材料,考察了偶联剂的引入对杂化材料的形貌和光学性能的影响。利用红外光谱表征材料的结构,扫描电镜和荧光光谱表征材料的性能。结果表明,随着偶联剂的引入,可以有效避免相分离现象和荧光淬灭,显著提高了杂化材料的光学性能。     

通讯窗口稀土(钕和铒)掺杂有源光波导材料的研究进展

稀土（钕和铒）掺杂有源光波导材料可应用在1.34μm和1.54μm两通讯窗口的光放大，综述了通讯窗口波段的稀土掺杂有源光波导材料的研究现状，阐述了不同基质材料的优缺点，提出了稀土有机配合物作为有源光波导激光物质的新的研究方向，并展望其发展前景。     

聚甲基丙烯酸丁酯-二氧化硅杂化材料的制备及性能

用硅酸钠制备了聚硅酸溶胶，作为制备有机／无机杂化材料的无机组分前驱物，以甲基丙烯酰氧丙基三甲氧基硅烷为偶联剂，通过溶胶-凝胶技术与甲基丙烯酸丁酯制得两相间有共价键结合的透明聚甲基丙烯酸丁酯／二氧化硅杂化材料。用红外光谱、透射电镜、TG和DSC等对杂化材料进行了表征，热失重分析表明，杂化材料的热稳定性随SiO2含量的增加而提高，且杂化材料的玻璃化温度Tg也有一定的提高，同时杂化材料的透光率可达80％，硬度比纯PBMA有很大的提高。     

有机-无机分子杂化稀土发光材料研究

利用无机正硅酸乙酯（TEOS）和有机聚乙二醇（PEG），采用溶胶一凝胶法制备了一系列有机／无机纳米杂化复合材料。首先将TEOS在酸性条件下预水解，再与PEG共水解、共缩聚以形成有机／无机杂化网络结构。在溶胶一凝胶过程中引入稀土离子来制备发光材料。通过控制工艺条件得到了具有良好稳定性和发光性能的透明有机／无机纳米杂化材料。     

含稀土配合物的甲基丙烯酸甲酯荧光性能研究

含稀土有机配合物的高分子材料综合了稀土材料和高分子材料的优异性能,在制备光学器件方面有广泛的应用前景.本文制备了含铕的噻吩甲酰三氟丙酮(TTA)和二苯甲酰甲烷(DBM)配合物的聚甲基丙烯酸甲酯(PMMA)体系,并考察了配合物含量、配体、小分子掺杂剂和PMMA分子量对体系荧光性能的影响.分析表明要想获得高效发光的稀土配合物高分子体系需要选用对称性较差,含氟取代基较多的配体,并找到合适的配体或小分子掺杂剂的含量,且尽量增大基体的分子量.     

聚对苯乙炔/Eu（phen）_2Cl_3杂化材料的合成及光学性能

采用原位脱氯化氢缩合聚合法制备了聚（2-甲氧基-5-辛氧基）对苯乙炔/二元稀土配合物Eu（phen）2Cl3（PMO-COPV/Eu（phen）2Cl3）杂化材料。红外光谱证实了在Eu（phen）2Cl3表面的包覆层为PMOCOPV。紫外-可见吸收光谱表明与PMOCOPV相比,PMOCOPV/Eu（phen）2Cl3的...     

Rare earth (Eu, Tb) centered composite gels Si-O-M (M = B, Ti) through hexafluoroacetyl-acetone building block: Sol-gel preparation, characterization and photoluminescence

This report focuses on the syntheses of a series of novel photoactive composite xerogels materials in which the functionalized hexafluoroacetylacetone (HFAASi) organic components are grafted into the different inorganic networks (SiO₂-B₂O₃ or SiO₂-TiO₂) via covalent bonds through a sol-gel process. Subsequently, the physical characterization and especially photoluminescent properties of the resulting xerogel materials are studied in detail. Except for composite xerogels linked to SiO₂-TiO₂ networks, all of these composite xerogels exhibit homogeneous microstructures and morphologies, suggesting that molecular-based materials are obtained with strong covalent bonds between the organic β-diketone ligand and inorganic matrices. In addition, the ternary rare earth composite gels present stronger luminescent intensities, longer lifetimes, and higher luminescent quantum efficiencies than the binary ones, indicating that the introduction of the second ligands (phen) can sensitize the luminescent emission of the rare earth ions in the ternary hybrid systems. It should be especially noted that these composite xerogels based on Si-O-B networks possess not only higher thermal stability but also stronger luminescent intensities than the other systems linked to different inorganic networks.     

溶胶-凝胶法稀土平面光波导薄膜研究进展

简单介绍了溶胶-凝胶方法的特点、平面光波导的基本结构及工艺特点;简要回顾了国内外近年来无机薄膜、复合薄膜、稀土配合物在工艺、合成、性能、机理等方面的研究情况.与传统的无机平面光波导薄膜相比,有机-无机复合薄膜具有明显的优势,可以在低温下一次拉制成具有实用价值的平面光波导厚膜.稀土配合物的发展解决了稀土与复合薄膜中有机组分不相容、掺杂浓度低的问题.因此,稀土配合物是制作有源平面光波导复合薄膜的理想材料.     

One-dimensional rare earth compounds and complexes: preparation and improved photoluminescence properties

One-dimensional nanosized phosphors demonstrate special structural and photoluminescence properties, which have application potential in some optical fields. In this article, we present our recent progress on preparation and luminescence properties of some one-dimensional rare earth compounds and complexes, the core-shell oxide nanowires prepared by a two-step hydrothermal route, the nanowires of some inorganic compounds doped with rare earths and rare earth complexes/PVP composites prepared by the electrospinning method, and the rare earth complexes in the SBA-15 mesoporous molecule sieves. In these systems, some novel or improved photoluminescence properties are observed such as improved luminescence quantum yield, thermal stability and/or photostability, and depressed thermal effect in upconversion luminescence.     

细菌纤维素负载稀土掺杂二氧化钛复合膜的制备和光催化性能

以细菌纤维素(BC)为载体,用溶胶-凝胶法原位生成稀土镧和铈元素(La,Ce)掺杂的二氧化钛复合膜,以甲基橙为目标降解物,考察了复合膜的光催化活性。结果表明:稀土元素已引入TiO_2/BC复合膜中;掺杂TiO_2的晶型为锐钛矿型;掺杂稀土的TiO_2/BC复合膜的光催化活性比未掺杂的有较大提高;铈掺杂的TiO_2/BC复合膜的光催化性能优于镧掺杂的;Ce~(4+)掺杂的最适浓度为2 mmol/L,而La~(3+)掺杂的最适浓度为5 mmol/L;稀土掺杂的TiO_2/BC复合膜对甲基橙溶液重复降解5次的降解率仍高于70%。     

稀土发光材料的研究与展望

简要介绍了稀土发光材料的发光原理和八种制备方法，包括传统的高温固相反应法溶胶-凝胶法、水热合成法、低温燃烧合成法、化学沉淀法、微波辐射法、电弧法、CO2激光加热气相沉积合成法，总结了每种制备方法的优缺点，并对稀土发光材料的应用和发展前景进行了展望。     

铕(Ⅲ)-4-VP光致发光稀土配合物单体的制备

以 4 乙烯基吡啶 (4VP)、邻菲洛啉 (Phen)为配体 ,与EuCl3 在乙醇溶液中一步合成了含有双键的三元稀土配合物 ,通过紫外光谱与荧光光谱的测定 ,研究稀土配合物光致发光的机理。结果表明 ,4 乙烯基吡啶通过吡啶环上的氮原子与稀土离子可直接配位 ;邻菲洛啉配体具有协同配位效应。稀土配合物较EuCl3 的荧光发射强度提高了 12倍之多。     

Rare earth doped SnO2 nanoscaled powders and coatings: enhanced photoluminescence in water and waveguiding properties

Luminescent Eu3+ and Er3+ doped SnO2 powders have been prepared by Sn4+ hydrolysis followed by a controlled growth reaction using a particle's surface modifier in order to avoid particles aggregation. The powders so obtained doped with up to 2 mol% rare earth ions are fully redispersable in water at pH > 8 and present the cassiterite structure. Particles size range from 3 to 10 nm as determined by Photon Correlation Spectroscopy. Rare earth ions were found to be essentially incorporated into the cassiterite structure, substituting for Sn4+, for doping concentration smaller than 0.05 mol%. For higher concentration they are also located at the particles surface. The presence of Eu3+ ions at the surface of the particles hinder their growth and has therefore allowed the preparation of new materials consisting of water redispersable powders coated with Eu(3+)-beta diketonate complexes. Enhanced UV excited photoluminescence was observed in water. SnO2 single layers with thickness up to 200 nm and multilayer coatings were spin coated on borosilicate glass substrates from the colloidal suspensions. Waveguiding properties were evaluated by the prism coupling technique. For a 0.3 microm planar waveguide single propagating mode was observed with attenuation coefficient of 3.5 dB/cm at 632.8 nm.     

稀土对真空熔覆Ni基/WC涂层组织结构的影响

以往对稀土Ce La影响真空熔覆Ni基/WC涂层的探讨较少.采用真空熔覆的方法在45钢上获得添加有稀土的Ni基/WC复合涂层,借助X射线衍射、SEM及EDX研究了涂层的显微组织、化学成分和相结构.结果表明:稀土的加入改善了真空熔覆Ni基/WC复合涂层的组织,消除了针状相,使组织更加均匀致密;稀土还降低了Ni基/WC涂层各组成相中Fe元素的含量,减缓了Fe原子对Ni基合金涂层的"稀释"作用;稀土还使真空熔覆Ni基/WC涂层的(Ni,Fe)固溶体基体部分转变成了(Ni,Cr,Fe)固溶体基体,并析出了新的第二相NiB.     

稀土铕四元配合物纳米微晶的制备及性能

为了得到粒径均匀的纳米稀土铕四元配合物,采用化学沉淀法,进一步优化试验条件,制备Eu(BA)(TTA)2邻菲罗林纳米微晶,采用元素分析、红外光谱、热重分析、荧光光谱和透射电镜等方法对其进行表征和分析。结果表明,稀土铕四元配合物中高效率的能量传递是通过在2种不同第一配体之间形成的"协同效应"来完成,四元配合物中3种不同的配体可以更好地取代配位水;四元稀土配合物不仅发光性能优于常见的三元配合物,而且热稳定性好,粒径较小且均匀,可进一步掺入高分子形成功能性含稀土高分子聚合物;选用合适的缓冲溶液,在调节pH时将缓冲溶液缓慢地逐滴加入,可采取往反应体系中通氨气的方法,以使体系的pH改变较为平稳,生成的沉淀粒径较小且均匀。     

The preparation and thermoluminescence of alkaline earth sulphide phosphors

The present article offers a review of the material preparation and thermoluminescence (TL) of alkaline earth sulphide phosphors. Different methods of material preparation and characterization of alkaline earth sulphides in the form of polycrystalline powders, films, single crystals and pellets are described. In the process of impurity doping, the role of flux is explained. The general theory of TL and the different methods used to calculate the trapping parameters (E and s) from the TL glow curves are presented. The effects of impurities, flux, grain size, preparative parameters etc. on the TL of these materials are reported. The types of traps and trapping parameters obtained by various workers are given. Considering the results presented by various authors, possible impurity complexes are proposed. The potential applications of these phosphors in TL and OSL dosimetry, cathode ray tubes, electroluminescence panels and infrared sensors are briefly discussed.