Dinuclearization strategy of cationic iridium(<scp>iii</scp>) complexes for efficient and stable flexible light-emitting electrochemical cells

Song, Weilin; Mao, Huiting; Shao, Kui‐Zhan; Shan, Guo‐Gang; Gao, Ying; Zeng, Qunying; Li, Fushan; Su, Zhong‐Min

doi:10.1039/d2tc03539a

Cited by 8 publications

(2 citation statements)

References 83 publications

(104 reference statements)

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“…and exhibit great potential in the photoelectric and biomedical fields. [40][41][42][43][44][45] The intrinsic counter anion is an important component of the iridium(III) complex, which can not only modulate the intermolecular interactions but also affect the excited state nature. 46 However, the structure relaxation between the ground state and excited state as well as π-π stacking will lead to poor efficiency of the resulting iridium(III) complexes.…”

Section: Introductionmentioning

confidence: 99%

Constructing anion–π interactions in cationic iridium(iii) complexes to achieve aggregation-induced emission properties

Song,

Gao,

Gao

et al. 2024

Inorg. Chem. Front.

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Section: Introductionmentioning

confidence: 99%

Constructing anion–π interactions in cationic iridium(iii) complexes to achieve aggregation-induced emission properties

Song,

Gao,

Gao

et al. 2024

Inorg. Chem. Front.

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“…Owing to the strong interactions between the long-lived excited states, their energies are easily quenched and exhausted by the surrounding molecules, resulting in reduced ϕ values or emission intensities. Research on such self-quenching behaviors has been reported in the incorporation of Ir(III)-based materials into organic light-emitting devices ( Kawamura et al, 2006 ; Song et al, 2023 ; Temram et al, 2023 ). One universal solution to the abovementioned problems to date is to disperse Ir(III) compounds in an appropriate host material.…”

Section: Introductionmentioning

confidence: 99%

Phosphorescent iridium (III) complex with covalent organic frameworks as scaffolds for highly selective and sensitive detection of homocysteine

Deng,

Xu,

Zhang

et al. 2024

Front. Chem.

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Introduction: Developing a convenient and cost-effective platform for detecting homocysteine (Hcy) is of great interest as Hcy has been found to be a biomarker for Alzheimer’s disease, gastric cancer, and other diseases.Methods: In this study, we synthesized five phosphorescent Ir(C∧N)2(N∧N)+ compounds (Irn, n = 1–5) with various substituents (-CHO or -CHO/-NH2), which were then doped into a covalent organic framework (COF) host via covalent bonding.Results and Discussion: The resulting optimal composites (denoted as Ir4/5@EBCOF) with -CHO/-NH2 substituents not only overcame the self-quenching issue of the bare Ir4/5 complexes but also showed rapid, highly selective, and sensitive detection of Hcy, with a limit of detection (LOD) of 0.23 μM and reaction time of 88 s. The sensing mechanism was revealed as the unique cyclization reaction between Ir(III) and Hcy that forms a six-membered ring. During the process, the color changes in the composites can be observed visually. It is expected that these phosphorescent Iridium (III) complexes with COFs will have the potential to serve as promising platforms for detecting thiols.

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Binuclear Copper(I) Complexes for Near‐Infrared Light‐Emitting Electrochemical Cells

Jouaiti,

Ballerini,

Shen

et al. 2023

Angewandte Chemie

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Two binuclear heteroleptic CuI complexes, namely Cu−NIR1 and Cu−NIR2, bearing rigid chelating diphosphines and π‐conjugated 2,5‐di(pyridin‐2‐yl)thiazolo[5,4‐d]thiazole as the bis‐bidentate ligand are presented. The proposed dinuclearization strategy yields a large bathochromic shift of the emission when compared to the mononuclear counterparts (M1–M2) and enables shifting luminescence into the near‐infrared (NIR) region in both solution and solid state, showing emission maximum at ca. 750 and 712 nm, respectively. The radiative process is assigned to an excited state with triplet metal‐to‐ligand charge transfer (3MLCT) character as demonstrated by in‐depth photophysical and computational investigation. Noteworthy, X‐ray analysis of the binuclear complexes unravels two interligand π–π‐stacking interactions yielding a doubly locked structure that disfavours flattening of the tetrahedral coordination around the CuI centre in the excited state and maintain enhanced NIR luminescence. No such interaction is present in M1–M2. These findings prompt the successful use of Cu−NIR1 and Cu−NIR2 in NIR light‐emitting electrochemical cells (LECs), which display electroluminescence maximum up to 756 nm and peak external quantum efficiency (EQE) of 0.43 %. Their suitability for the fabrication of white‐emitting LECs is also demonstrated. To the best of our knowledge, these are the first examples of NIR electroluminescent devices based on earth‐abundant CuI emitters.

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Dinuclearization strategy of cationic iridium(iii) complexes for efficient and stable flexible light-emitting electrochemical cells

Abstract: Light-emitting electrochemical cells (LECs) as simple and low-cost electroluminescent devices belong to the most promising candidate for next-generation flexible and large-area solid-state lighting applications. However, the development of efficient emissive...

Cited by 8 publications

References 83 publications

Constructing anion–π interactions in cationic iridium(iii) complexes to achieve aggregation-induced emission properties

Constructing anion–π interactions in cationic iridium(iii) complexes to achieve aggregation-induced emission properties

Phosphorescent iridium (III) complex with covalent organic frameworks as scaffolds for highly selective and sensitive detection of homocysteine

Binuclear Copper(I) Complexes for Near‐Infrared Light‐Emitting Electrochemical Cells

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