Homo-dinuclear SamariumIII and EuropiumIII complexes with remarkable quantum yields: Orange-red and bright- red emitters

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-10-03 DOI:10.1016/j.optmat.2025.117583

Asgar Ali , Zubair Ahmed , Khalid Iftikhar

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Abstract

This paper presents the synthesis and thorough characterizations of two highly luminescent heteroleptic homo-dinuclear samarium^III and europium^III complexes, [Ln(fod)₃(μ-PBTPy)Ln(fod)₃] (Ln = Eu(1) and Sm(2); fod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione (Hfod) and PBTPy = 4ʹ,4ʹʹʹʹ-(1,4-phenylene)bis(2,2ʹ:6ʹ,2ʹʹ-terpyridine}. Remarkably, the Sm^III complex exhibits the highest solid-state photoluminescence quantum yield (PLQY = 13 %), ever reported for samarium complexes. The Eu^III complex shows PLQY of 25 %. These results demonstrate that the PBTPy is an efficient synergic ligand for Sm^III than Eu^III ions. The intensity ratio between the Ln^III chelates, [Ln(fod)₃(H₂O)] and PBTPy ligand in ¹H NMR spectra confirm the formation of dinuclear complexes. Moreover, NMR analysis also indicates that the complexes adopt nine-coordinate structures in solution. The luminescent properties of the complexes were investigated in solid, solution and 3 % PMMA. Furthermore, the obtained band gaps fall within the semiconductor range, suggesting their potential application in optoelectronics.

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具有显著量子产率的同核SamariumIII和EuropiumIII配合物：橙红色和亮红色发射体

本文合成了两种高发光异色同双核钐铕配合物[Ln(fod)3(μ-PBTPy)Ln(fod)3] (Ln = Eu（1)和Sm(2)）并对其进行了全面表征；fod = 6、6、7、7、8、8日8-heptafluoro-2, 2-dimethyl-3, 5-octanedione (Hfod)和PBTPy = 4ʹ4ʹʹʹʹ- (1,4-phenylene)双(2,2ʹ:6ʹ2ʹʹ-terpyridine}。值得注意的是，SmIII配合物具有钐配合物中最高的固态光致发光量子产率（PLQY = 13%）。EuIII复合物的PLQY为25%。这些结果表明PBTPy是SmIII的高效协同配体，而不是EuIII离子。LnIII螯合物[Ln(food)3(H2O)]与PBTPy配体的1H NMR强度比证实了双核配合物的形成。此外，核磁共振分析还表明，配合物在溶液中采用九坐标结构。研究了配合物在固体、溶液和3% PMMA中的发光性能。此外，获得的带隙落在半导体范围内，表明它们在光电子学中的潜在应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.