C1-Symmetric [Ir(C^N1)(C^N2)(N^O)]-tris-heteroleptic Ir(<scp>iii</scp>)-complexes with a horizontal orientation for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

Li, Wentao; Miao, Tiezheng; Wang, Baowen; Liu, Jiaxiang; Lü, Xingqiang; Fu, Guorui; Feng, Weixu; Wong, Wai Yeung

doi:10.1039/d1tc01977e

Cited by 12 publications

(8 citation statements)

References 48 publications

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“…It should be noted that the introduction of the second C ∧ N ligand with relatively small π conjugation could greatly improve their solubility, which is beneficial for the solution-processed NIR OLEDs. Thanks to the preferential horizontal orientation of the emitting dipoles, a high-performance NIR electroluminescence based on 28 (λ EL = 715 nm, EQE max = 5.3%) was achieved with negligible efficiency roll-off (<2%) by the solution-processing method (Figure b,c) . Because of the presence of the asymmetric 3-hydroxypicolinic acid ligand, a pair of stereoisomers 30 and 31 were generated and confirmed by their crystal structures (Figure ).…”

Section: Mononuclear Tris-heteroleptic Iridium(iii) Complexesmentioning

confidence: 78%

“…Very recently, by utilizing the classical ligand 1-(benzo[ b ]thiophen-2-yl)isoquinoline (btiq), a series of NIR emissive tris -heteroleptic iridophosphors 27 – 31 (Figure a) were developed by us. − For the acac-based complexes 27 – 29 , their emission wavelengths and PLQYs (703 nm, 0.18 for 27 ; 715 nm, 0.26 for 28 ; 707 nm, 0.28 for 29 ) can be tuned by the second C ∧ N ligand. The remarkably enhanced PLQYs of these iridophosphors are attributed to the strengthened 3 MLCT contribution.…”

Section: Mononuclear Tris-heteroleptic Iridium(iii) Complexesmentioning

confidence: 99%

“…ORTEP diagrams of complexes 30 and 31 . Redrawn from data in ref . (b) EL spectra of OLEDs based on complexes 27 – 29 .…”

Section: Mononuclear Tris-heteroleptic Iridium(iii) Complexesmentioning

confidence: 99%

“…The numbers indicated in the figure refer to the iridophoephors. Data are taken from refs , −, , , , , −.…”

Section: Conclusion Perspective and Future Opportunitiesmentioning

confidence: 99%

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Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

et al. 2022

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Metrics & MoreArticle Recommendations * sı Supporting Information CONSPECTUS:The rapid developments of cutting-edge research on photofunctional organic semiconductor materials are greatly promoting the progress of science and technology. As one of the most important organic semiconductor materials, phosphorescent iridium(III) complexes are a promising class of organometallic emitters because of their rich emissive excited states together with excellent chemical stability, which have been widely used in various fields, such as organic electroluminescence, solar cells, photocatalysis, biosensing, bioimaging, cancer therapy, etc. The exploration of highly efficient phosphorescent iridium(III) complexes showing various structural features is blooming quickly.In general, the traditional iridium(III) phosphors usually contain at least two identical cyclometalating bidentate ligands. These iridophosphors with two identical bidentate ligands are termed as the bis-heteroleptic complex Ir((L 1 ) 2 L 2 ), where L denotes the free ligand or the deprotonated form of the free ligand. Those with three identical ligands are called homoleptic complex Ir(L) 3 .Recently, the iridium(III) complexes Ir(L 1 L 2 L 3 ) supported by three different (cyclometalating) ligands are emerging as a novel and interesting category of phosphors. This class of iridophosphors usually refers to tris-heteroleptic cyclometalated phosphorescent iridium(III) complexes, and they usually show the asymmetry in their molecular structures. Compared with the case for the traditional iridium(III) phosphors, the independent ligand control provides tris-heteroleptic iridium(III) phosphors with more flexible molecular design/synthesis and excited-state fine-tuning ability, thereby resulting in more rich and appealing excited states and potential multifunctional applications.In this Account, we will highlight our recent efforts on the asymmetric tris-heteroleptic cyclometalated iridium(III) phosphors including the molecular design strategies, chemical synthesis, excited-state tuning, and structure−property relationships as well as their applications, especially in organic electroluminescence. Specifically, the molecular design of tris-heteroleptic iridium(III) phosphors focuses on the independent ligand design including the following three aspects: (1) the substituent functionalization engineering (SFE); (2) the ligand skeleton engineering (LSE); (3) the double metalation engineering (DME). For SFE, we mainly introduce the substituent based on the main-group element into the ligand of iridophosphors and also investigate the influence of the substituent position on the emissive excited states of iridophosphors. For instance, the main-group elements show unique electronic effects, which could contribute to the manipulation of the photoelectric properties of complexes (e.g., balanced charge transport ability, improved utilization of excitons, etc.). For LSE, different types of aromatic skeleton or various lengths of π conjugation of the ligands are also examined for t...

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Section: Mononuclear Tris-heteroleptic Iridium(iii) Complexesmentioning

confidence: 78%

Section: Mononuclear Tris-heteroleptic Iridium(iii) Complexesmentioning

confidence: 99%

“…ORTEP diagrams of complexes 30 and 31 . Redrawn from data in ref . (b) EL spectra of OLEDs based on complexes 27 – 29 .…”

Section: Mononuclear Tris-heteroleptic Iridium(iii) Complexesmentioning

confidence: 99%

“…The numbers indicated in the figure refer to the iridophoephors. Data are taken from refs , −, , , , , −.…”

Section: Conclusion Perspective and Future Opportunitiesmentioning

confidence: 99%

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Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

et al. 2022

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“…In the meantime, O 2 ‐sensitivie NIR‐II phosphorescence excited by 500 nm was possibly dependent on the energy transfer at J‐aggregates’ excitation states and originated from oxygen‐dependent phosphorescence caused by the metal to ligand charge transfer (MLCT) transition in monomer PpyPt. [ 19 ]…”

Section: Resultsmentioning

confidence: 99%

NIR‐II J‐Aggregated Pt(II)‐Porphyrin‐Based Phosphorescent Probe for Tumor‐Hypoxia Imaging

Zhang

Chen

Sun

et al. 2022

Adv Healthcare Materials

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The luminescence of traditional phosphorescence-based hypoxia probes is limited to the visible and first near-infrared wavelength regions (<1000 nm), which has defects of higher light scattering and lower penetration depth in contrast with the second near-infrared wavelength window (NIR-II, 1000-1700 nm) for optical bioimaging. Herein, 5,15-bis(2,6-bis(dodecyloxy) phenyl)-porphyrin platinum(II) (PpyPt) with J-aggregation induced NIR-II phosphorescence is reported. J-aggregates of PpyPt are confirmed by the X-ray diffraction data in the crystalline state. Moreover, the emission and excitation spectra of PpyPt in the solid states reveal NIR-II luminescence feature of PpyPt in J-aggregates. More importantly, by preparation of water-soluble PpyPt nanoparticles (PpyPt NPs 4.76 ) with J-aggregates, it has NIR-II phosphorescent lifetime of microseconds and good oxygen-sensitivity in water. Moreover, the good biological hypoxia-sensing potential of PpyPt NPs 4.76 is demonstrated in cells and 4T1-tumor-bearing mice. This study provides an efficient strategy to design NIR-II phosphorescent probe for sensitive tumor-hypoxia detection through the construction of J-aggregates.

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Geometrically isomeric [Ir(C^N)(C’^N′)(N’‘^N‴)]-tris-heteroleptic [Ir(iqbt)(ppy)(fprpz)] iridium(III)-complexes for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

Wang,

Zhang,

Hou

et al. 2024

Journal of Luminescence

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C₁-Symmetric [Ir(C^N¹)(C^N²)(N^O)]-tris-heteroleptic Ir(iii)-complexes with a horizontal orientation for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

Cited by 12 publications

References 48 publications

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

NIR‐II J‐Aggregated Pt(II)‐Porphyrin‐Based Phosphorescent Probe for Tumor‐Hypoxia Imaging

Geometrically isomeric [Ir(C^N)(C’^N′)(N’‘^N‴)]-tris-heteroleptic [Ir(iqbt)(ppy)(fprpz)] iridium(III)-complexes for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

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C1-Symmetric [Ir(C^N1)(C^N2)(N^O)]-tris-heteroleptic Ir(iii)-complexes with a horizontal orientation for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

Cited by 12 publications

References 48 publications

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

NIR‐II J‐Aggregated Pt(II)‐Porphyrin‐Based Phosphorescent Probe for Tumor‐Hypoxia Imaging

Geometrically isomeric [Ir(C^N)(C’^N′)(N’‘^N‴)]-tris-heteroleptic [Ir(iqbt)(ppy)(fprpz)] iridium(III)-complexes for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

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C₁-Symmetric [Ir(C^N¹)(C^N²)(N^O)]-tris-heteroleptic Ir(iii)-complexes with a horizontal orientation for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)