Polikovskiy Trofim A, Shikin Daniil D, Korshunov Vladislav M, Gontcharenko Victoria E, Metlin Mikhail T, Datskevich Nikolay P, Islamov Marat M, Kompanets Victor O, Chekalin Sergey V, Belousov Yuriy A, Taydakov Ilya V
P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy 1. Prospect, 119991 Moscow, Russia.
Moscow Institute of Physics and Technology, Institutsky Lane 9, 141700 Dolgoprudny, Moscow Region, Russia.
Int J Mol Sci. 2025 Jul 16;26(14):6814. doi: 10.3390/ijms26146814.
Achieving high quantum yields for Yb ion emission in complexes with organic ligands is a challenging task, as most Yb complexes with such ligands typically exhibit efficiencies below 3.5%. Our research demonstrates that the introduction of heavy atom-containing ancillary ligands, such as TPPO or TPAO, along with the careful engineering of the main β-diketone ligand, can increase the luminescence efficiency up to 20-fold by the alteration of the energy migration pathway. It is demonstrated that the combination of two distinct organic ligands leads to the blockage of singlet-triplet intersystem crossing (ISC), alongside electronic energy transfer from β-diketone to Yb ions through charge transfer states. The synthesized complexes exhibit quantum yields of 6.5% and 7.0% in the solid state, which places them at the top globally among this class of materials with simple non-deuterated and non-fluorinated ligands.
在与有机配体形成的配合物中实现镱离子发射的高量子产率是一项具有挑战性的任务，因为大多数含有此类配体的镱配合物通常表现出低于3.5%的效率。我们的研究表明，引入含重原子的辅助配体，如三苯基氧化膦（TPPO）或三苯基砷氧化物（TPAO），并对主要的β-二酮配体进行精心设计，可以通过改变能量迁移途径将发光效率提高20倍。结果表明，两种不同有机配体的组合导致单重态-三重态系间窜越（ISC）受阻，同时通过电荷转移态实现从β-二酮到镱离子的电子能量转移。合成的配合物在固态下的量子产率分别为6.5%和7.0%，在全球范围内，这类具有简单非氘代和非氟化配体的材料中处于领先地位。
