稀土圆偏振发光材料研究进展

Research Progress of Rare Earth-Based Circularly Polarized Luminescent Materials

圆偏振光(CPL)是一种特殊而重要的光,在三维显示、有机光电器件、安全油墨、生物和化学探针等方面具有广泛应用前景.发光不对称因子和发光量子产率是衡量圆偏振发光性能的重要指标.受磁跃迁偶极矩较小的影响,大部分手性材料的发光不对称因子较小.稀土金属离子优异的光、电性能和部分磁偶极跃迁允许特性使手性稀土化合物被认为是理想的具有高发光不对称因子和高发光量子产率的圆偏振发光材料.基于此,本综述归纳总结了手性稀土材料在可见光、近红外光和双光子激发圆偏振发光材料等方面的研究进展,探讨了配体、溶剂、阴离子、多级自组装作用和外界刺激等因素对圆偏振发光性能的调控规律,总结了手性稀土圆偏振发光材料在圆偏振有机发光二极管、生物传感、检测、防伪和成像等方面的应用,以及该领域目前面临的主要机遇和挑战.

As a special and important light,circularly polarized light(CPL)has shown unprecedented potentials in the applications of advanced three-dimensional(3D)displays,organic optoelectronic devices,security inks,and biological or chemical probes.Luminescence dissymmetry factor(glum)and quantum yields(Φ)are important factors that adopted to eval-uate the magnitudes of CPL signals.Most chiral luminescent materials have low glum values due to the low magnetic-dipole transition moments.Attributing to the unique photophysical,optoelectronic properties and magnetic-dipole allowed transi-tions,chiral rare earth materials are promising candidates for circularly polarized luminescent materials possessing both large glum and highΦ.Herein,a comprehensive and up-to-date overview of the research progress of rare earth-based circularly polarized luminescent materials is presented,which contains:(i)the developments of visible light,near-infrared light(NIR)and two-photon circularly polarized luminescence;(ii)the effects of ligands,solvents,anions,supermolecular self-assembly,external stimulus on the circularly polarized luminescence performances;(iii)the applications in circularly polarized-organic light-emitting diodes(CP-OLED),biosensing,detection,and security devices.Finally,current challenges and future opportu-nities are discussed.