近红外发光稀土配合物及杂化材料研究进展

稀土因其特殊的物理和化学性质,在信息技术、能源技术、生物技术等高科技领域及国防建设等方面都起着非常重要的作用,中国作为稀土大国,十分重视对稀土材料的研究和开发。稀土离子近红外发光(750～1700 nm)在激光和光纤通讯、医学诊断、免疫分析等热门领域的潜在应用,受到了科研人员的极大关注。稀土离子本身发光极弱,通过分子内传能有机配体可以敏化稀土离子发光,但稀土配合物常受外界干扰,其稳定性较差,若将其与凝胶、介孔材料、离子液体等无机基质复合,得到具有良好光、热稳定性和化学稳定性的有机/无机杂化材料。总结了近些年来近红外发光稀土配合物及近红外发光稀土杂化材料的研究进展,并对其发展前景进行了展望。

Recent Advances in Near-infrared Luminescent Lanthanide Complexes and Hybrid Materials

Rare earth plays a significantly important role in high-tech fields,such as information and energy industry,biotechnology with the physical and chemical specialty.As a country which is rich in rare earth,China attaches great importance to the research and exploitation of materials containing rare earth.In recent decades,near-infrared(NIR) luminescence of trivalent lanthanide ions became vital to laser systems,optical fiber communication,as well as medical diagnosis and immunoassay.It is challengeable to produce efficient luminescence by direct excitation of these NIR luminescent lanthanide ions,such as Nd3+,Er3+,and Yb3+ etc.The lanthanide ions can be sensitized by chelates with chromophores via intramolecular energy transfer,but the obtained complexes are usually unstable.This problem can be settled by incorporation of NIR-luminescent lanthanide complexes into the host matrixes(e.g.,sol-gel,mesoporous materials,and ionic liquid,etc),organic-inorganic hybrid luminescent materials with desired luminescent,heat stabilities or chemical stability were obtained.The latest developments in the fields of NIR-luminescent lanthanide complexes and the NIR-luminescent hybrid materials were reviewed,and an evaluation and prospect about the developments were also proposed.