稀土配合物-无机杂化发光材料研究进展

Research Progress of Rare Earth Complex-Inorganic Hybrid Luminescent Materials

稀土元素独特的4f亚层电子在一定的激发条件下具有丰富的能级跃迁,表现出优异的磁、光、电等性能,但稀土三价离子4f组态内跃迁是宇称禁戒的。将稀土离子引入某些晶格中或者结合有机配体形成稀土配合物,可提高其发光强度。稀土配合物易受外界环境影响,稳定性较差,将有机配体与无机基质连接制备高性能稀土杂化发光材料,应用潜力巨大。本文从结构组成、发光机理和合成方法等方面详细综述多种无机基质和稀土配合物杂化材料的研究现状,包括介孔二氧化硅、沸石、锂皂石、石墨烯及其衍生物、二氧化钛等。其次,介绍稀土无机杂化材料在硅太阳能电池、LED发光材料、信息防伪加密发光传感器和生物应用等不同领域的应用进展。最后,对稀土无机杂化工艺的发展趋势进行了展望,未来应探究稀土离子有机配体和无机基质的微观结构组成及作用机理,研究敏化性能良好有机配体的设计和组装,从而实现稀土无机杂化材料的高效利用和功能化发展,并实现工业化生产。

The rare earth metal elements show excellent magnetic,optical and electrical properties due to their unique 4f sublayer electrons,which have rich energy level transitions under certain excitation conditions,but the 4f configuration transition of rare earth trivalent ions is parity forbidden.The luminescence intensity can be improved by introducing the rare earth ions into some crystal lattices or combining with organic ligands to form rare earth complex.Rare earth complexes are susceptible to the external environment and have relatively poor stability.It has great application potential to prepare high-performance rare earth hybrid luminescent materials through connecting organic ligands with inorganic matrix.In this paper,the research status of the hybridization processes of various inorganic substrates and rare earth complexes,including mesoporous silicon dioxide,zeolite,lithium saponite,graphene and its derivatives,and titanium dioxide,is reviewed in detail from the perspectives of structure composition,luminescence mechanism and synthesis methods.Then,the application progress of rare earth inorganic hybrid materials in silicon solar cells,LED luminescent materials,information security encryption,luminescent sensors and biological applications are introduced.Finally,the research direction prospect of rare earth inorganic hybrid technology are discussed.In the fucture,the microstructure composition and action mechanism of rare earth ion organic ligands and inorganic matrix should be further explored.Moreover,the design and assembly of organic ligands with good sensitization performance were studied,so as to realize the efficient utilization and functional development of rare earth inorganic hybrid materials,and realize industrial production as well.