Deep-Red Light-Emitting Electrochemical Cells: A Novel Ruthenium Complex Approach

IF 3.7 2区化学 Q2 CHEMISTRY, APPLIED

Applied Organometallic Chemistry Pub Date : 2025-08-12 DOI:10.1002/aoc.70364

Babak Pashaei

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Abstract

This study presents the synthesis and characterization of a novel ruthenium(II) complex, [Ru (bpy)₂L][PF₆]₂ (RuBPPH), where L is a π-extended phenanthroline ligand, for application in near-infrared (NIR) light-emitting electrochemical cells (LECs). The RuBPPH complex exhibits a large Stokes shift and optimal HOMO-LUMO alignment, enabling efficient charge transfer and deep-red electroluminescence with a maximum emission wavelength of 675 nm. Photophysical and electrochemical analyses reveal that the extended π-conjugation of the ancillary ligand significantly enhances the device performance, achieving a maximum brightness of 2143 cd m⁻², an external quantum efficiency (EQE) of 0.62%, and a low turn-on voltage (V_on) of 3.4 V. Ligand design and ionic redistribution tune the emission properties of the LEC devices, resulting in a notable red shift in electroluminescence compared to solution-phase photoluminescence. These results highlight the critical role of ligand modification in optimizing deep-red LEC performance, offering insights for future material development. The study underscores the potential of ruthenium-based complexes in advancing NIR light-emitting technologies for biomedical and telecommunications applications.

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深红色发光电化学电池：一种新的钌络合物方法

本文研究了一种新型钌（II）配合物[Ru (bpy)2L][PF6]2 （RuBPPH）的合成和表征，其中L为π扩展菲罗啉配体，用于近红外（NIR）发光电化学电池（LECs）。RuBPPH配合物具有较大的Stokes位移和最佳的HOMO-LUMO取向，能够实现高效的电荷转移和最大发射波长为675 nm的深红色电致发光。光物理和电化学分析表明，辅助配体的扩展π共轭显著提高了器件的性能，器件的最大亮度为2143 cd m−2，外量子效率（EQE）为0.62%，导通电压（Von）为3.4 V。配体设计和离子重分配调整了LEC器件的发射特性，与溶液相光致发光相比，导致电致发光的显着红移。这些结果突出了配体修饰在优化深红色LEC性能中的关键作用，为未来材料的开发提供了见解。该研究强调了钌基配合物在推进近红外发光技术用于生物医学和电信应用方面的潜力。

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来源期刊

Applied Organometallic Chemistry 化学-无机化学与核化学

CiteScore

7.80

自引率

10.30%

发文量

408

审稿时长

2.2 months

期刊介绍： All new compounds should be satisfactorily identified and proof of their structure given according to generally accepted standards. Structural reports, such as papers exclusively dealing with synthesis and characterization, analytical techniques, or X-ray diffraction studies of metal-organic or organometallic compounds will not be considered. The editors reserve the right to refuse without peer review any manuscript that does not comply with the aims and scope of the journal. Applied Organometallic Chemistry publishes Full Papers, Reviews, Mini Reviews and Communications of scientific research in all areas of organometallic and metal-organic chemistry involving main group metals, transition metals, lanthanides and actinides. All contributions should contain an explicit application of novel compounds, for instance in materials science, nano science, catalysis, chemical vapour deposition, metal-mediated organic synthesis, polymers, bio-organometallics, metallo-therapy, metallo-diagnostics and medicine. Reviews of books covering aspects of the fields of focus are also published.