水-有机体系实现单分散苹果酸纳米配合物的可控调控

Controlled modulation of monodisperse gadolinium malate nanocomplexes by water-organic system

铕掺杂有机羧酸配合物由于分子间或分子内的能量转移而产生共荧光效应,可产生荧光强度高、寿命长、谱线分离清晰的荧光光谱,可广泛应用于显示器、激光器、太阳能电池和光纤放大等领域。对稀土纳米材料的结晶度、尺寸和形态进行精确调节和设计,有望提高其发光效率。本文通过简单的溶剂热法合成了不同大小的单分散的苹果酸钒纳米配合物。产物的分散性和尺寸可以通过改变溶剂系统进行调控。结果表明,有机溶剂的类型和比例在决定最终产物的尺寸和分散性等方面起着关键作用。此外,还研究了将苹果酸纳米配合物作为基质材料掺杂20%Eu^(3+)的光致发光(PL)性能。结果发现当H_(2)O:n-Hexane的体积比为31时,合成出的纳米粒子尺寸比较均匀,结晶性好,尺寸小于100nm,且掺杂后发光强度最强。

Europium-doped organic carboxylic acid complexes produce co-fluorescence effect due to inter-or intra molecular energy transfer,which can produce fluorescence spectra with high fluorescence intensity,long lifetime and clear spectral line separation,and can be widely used in the fields of displays,lasers,solar cells and optical fibre amplification.Precise adjustment and design of the crystallinity,size and morphology of rare earth nanomaterials are expected to improve their luminescence efficiency.In this paper,monodisperse gadolinium malate nanocomplexes of different sizes were synthesized by a simple solvothermal method.The dispersibility and size of the products could be tuned by changing the solvent system.The results showed that the type and ratio of organic solvents played a key role in determining the size and dispersibility of the final products.In addition,the photoluminescence(PL)properties of gadolinium malate nanocomplexes doped with 20%Eu^(3+)as a matrix material were investigated.It was found that when the volume ratio of H_(2)O:n-hexane was 3:1,the synthesized nanoparticles were more uniform in size,well crystallized,less than 100 nm in size,and had the strongest luminescence intensity after doping.