新型稀土功能材料的探索性基础研究

The rare earth elements contain 4f electronic sub-shell, having unique optical, electric and magnetic properties. They are an important key component in high and new technological materials. There are abounding mineral resources of rare earth elements in China. However, our nation has not so far possess of any acknowledge property right in high technotechnological materials containing rare earth.elements. For transforming the resources predominance into the predominance in.science and technology in rare earth field in China, Now Chinese government is.now performing a “973” plan on rare earth filed, in which our lab plays a key.role. In order to enhance the creativity and forecast in rare earth sciences, this.国家自然科学基金资助项目结题报告.5.project will further emphasize investigation and search for new types of optical,.electric and magnetic functional materials contained-rare earth elements on the.basis of the “973” plan..The aim of the project is located at search for new materials, new prepared.routes, new type of compounds, new properties, and new theory on the rare earth.functional materials. The main research contents include as follows: to resolve.the problems on stability and luminescence efficiency of electroluminescence.materials of complexes containing-rare earth; to optimize preparation routes of.nano-composite oxide containing-rare earth in order to improve properties of.luminescence, electric and magneto-resistance of nano-materials containing-rare.earth; to research effects of the applied field on magnetism of molecules in order.to discover new useful phenomenon and to synthesize new type of.molecule-based magnetic materials; to investigate structure and energy transition.as well as spectroscopy properties of polymer-composite of rare earth complexes.for improvement of luminescence materials made of polymer-rare earth.composites. To study on mechanism of magnetic exchange interaction and.magneto-structure correlation in molecules on the basis of quantum chemistry in.order to develop new theory on molecular magnetism and to afford important.theoretical ground for designed syntheses of new type of molecule-based.magnetic materials..Important research achievements of the project are as follows:.(1) To designedly synthesize a series of novel Tb-, Eu- and Y-complexes,.research photoluminescence properties, thermal and film stability, and make up.into parts of electro- luminescence apparatus, found that their luminance are.8800cd/m2 for green colour, 2000cd/m2 for red colour and 666cd/m2 for blue.colour. These results keep ahead level in the world..(2) To optimize preparation routes for nano-rare earth composite oxide to.present approaches of controlled particle size, structure and face, provided a.solution of problem for impure PDP materials; CoFe2O4 nano-crystal film.dropped with both rare earth ions and Mn ion have an enhance of.photo-magnetic effect and reduce of Tc temperature. This is important to prepare.new photo-magnetic materials. To discover a reversible phase transition.phenomenon in rare earth-zirconium oxide system., this phenomenon found is.applicable for development of new electrolyte and catalyzer..(3) In the [La2Mn3] system with Kagome grid a slow relaxation.phenomenon depended upon the applied field has been observed. A series of.novel two-dimension molecule-based magnetic materials synthesized in our lab.has been cited by Chemical Review, 2002, 102, 2369..(4) In FT-Raman spectroscopy of 4I9/2 → 4I11/2 of neodymium ion a new.Raman enhance phenomenon has been observed. Their number, shape and.position of the peaks in electronic Raman spectroscopy are correlated with.coordinated structure of neodymium ion, which may be used as a spectroscopy.国家自然科学基金资助项目结题报告.6.probe for coordination environment of rare earth ions. This discovery has.received much attention from famous scientist Ozaki in 17th international Raman.spectroscopy conference..(5) On the basis of density functional theory in quantum chemistry the.magnetic coupl

以探寻新型稀土功能材料为目标，解决稀土配合物作为电致发光材料稳定性差、发光效率低的难题；研制性能优良的新型硅基稀土掺杂（薄膜、发光玻璃与光纤）发光材料；优化纳米材料制备方法，寻找优质纳米光、磁光和巨磁电阻材料；探讨外场对磁分子的作用，发现新现象，研制新型磁性分子材料；研究稀土功能材料中辐射与非辐射跃迁的规律性。