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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Zysman-Colman, Eli
University of St Andrews
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2024Organic light-emitting diodes comprising an undoped thermally activated delayed fluorescence emissive layer and a thick inorganic perovskite hole transport layer
- 2024Organic Light-Emitting Diodes Comprising an Undoped Thermally Activated Delayed Fluorescence Emissive Layer and a Thick Inorganic Perovskite Hole Transport Layer
- 2021A luminescent 1D silver polymer containing [2.2]paracyclophane ligandscitations
- 2020A Pd 3 L 6 supramolecular cage incorporating photoactive [2.2]paracyclophane unitscitations
- 2020Stable 6H organic-inorganic hybrid lead perovskite and competitive formation of 6H and 3C perovskite structure with mixed A cationscitations
- 2020A Pd3L6 supramolecular cage incorporating photoactive [2.2]paracyclophane Unitscitations
- 2020What controls the orientation of TADF emitters?citations
- 2019A Pd 3 L 6 supramolecular cage incorporating photoactive [2.2]paracyclophane Unitscitations
- 2019Stable 6H organic-inorganic hybrid lead perovskite and competitive formation of 6H and 3C perovskite structure with mixed A cationscitations
- 2019A Pd3L6 supramolecular cage incorporating photoactive [2.2]paracyclophane Unitscitations
- 2017Lessons learned in tuning the optoelectronic properties of phosphorescent iridium(III) complexescitations
- 2017Blue-to-green emitting neutral Ir(III) complexes bearing pentafluorosulfanyl groups:a combined experimental and theoretical studycitations
- 2017Blue-to-green emitting neutral Ir(III) complexes bearing pentafluorosulfanyl groups : a combined experimental and theoretical studycitations
- 2017Blue-to-green emitting neutral Ir(III) complexes bearing pentafluorosulfanyl groupscitations
- 2016Synthesis and characterization of green-to-yellow emissive Ir(III) complexes of pyridylbenzothiadiazine ligandcitations
- 2016Enhancing the photoluminescence quantum yields of blue-emitting cationic iridium(III) complexes bearing bisphosphine ligandscitations
- 2016Enhancing the photoluminescence quantum yields of blue-emitting cationic iridium(III) complexes bearing bisphosphine ligandscitations
- 2016Synthesis, properties and Light-Emitting Electrochemical Cell (LEEC) device fabrication of cationic Ir(III) complexes bearing electron-withdrawing groups on the cyclometallating ligandscitations
- 2016Synthesis, properties and Light-Emitting Electrochemical Cell (LEEC) device fabrication of cationic Ir(III) complexes bearing electron-withdrawing groups on the cyclometallating ligandscitations
- 2015Strategic modulation of the photonic properties of conjugated organometallic Pt–Ir polymers exhibiting hybrid CT-excited statescitations
- 2014Strategic modulation of the photonic properties of conjugated organometallic Pt–Ir polymers exhibiting hybrid CT-excited statescitations
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article
Synthesis, properties and Light-Emitting Electrochemical Cell (LEEC) device fabrication of cationic Ir(III) complexes bearing electron-withdrawing groups on the cyclometallating ligands
Abstract
The structure-property relationship study of a series of cationic Ir(III) complexes in the form of [Ir(C^N)<sub>2</sub>(d<i>t</i>Bubpy)]PF<sub>6</sub> [where dtBubpy = 4,4′-di<i>tert</i>-butyl-2,2′- bipyridine and C^N = cyclometallating ligand bearing an electron-withdrawing group (EWG) at C<sub>4</sub> of the phenyl substituent, i.e. -CF<sub>3</sub> (<b>1</b>), -OCF<sub>3</sub> (<b>2</b>), -SCF<sub>3</sub> (<b>3</b>), -SO<sub>2</sub>CF<sub>3</sub> (<b>4</b>)] have been investigated. The physical and optoelectronic properties of the four complexes were comprehensively characterized, including by X-ray diffraction analysis. All the complexes exhibit quasi-reversible dtBubpy-based reductions from -1.29 V to -1.34 V (<i>vs</i>. SCE). The oxidation processes are likewise quasi-reversible (metal+C^N ligand) and are between 1.54- 1.72 V (<i>vs</i>. SCE). The relative oxidation potentials follow a general trend associated with the Hammett parameter (σ) of the EWGs. Surprisingly, complex <b>4</b> bearing the strongest EWG does not adhere to the expected Hammett behavior and was found to exhibit red-shifted absorption and emission maxima. Nevertheless, the concept of introducing EWGs was found to be generally useful in blue-shifting the emission maxima of the complexes (λ<sub>em</sub> = 484-545 nm) compared to that of the prototype complex [Ir(ppy)<sub>2</sub>(d<i>t</i>Bubpy)]PF<sub>6</sub> (where ppy = 2- phenylpyridinato) (λ<sub>em</sub> = 591 nm). The complexes were found to be bright emitters in solution at room temperature (Φ<sub>PL</sub> = 45-66%) with long excited-state lifetimes (τ<sub>e</sub> = 1.14-4.28 μs). The photophysical properties along with Density Functional Theory (DFT) calculations suggest that the emission of these complexes originates from mixed contributions from ligand-centered (LC) transitions and mixed metal-to-ligand and ligand-to-ligand charge transfer (LLCT/MLCT) transitions, depending on the EWG. In complexes <b>1</b>, <b>3</b> and <b>4</b> the <sup>3</sup>LC character is prominent over the mixed <sup>3</sup>CT character while in complex <b>2</b>, the mixed <sup>3</sup>CT character is much more pronounced, as demonstrated by DFT calculations and the observed positive solvatochromism effect. Due to the quasi-reversible nature of the oxidation and reduction waves, fabrication of light emitting electrochemical cells (LEECs) using these complexes as emitters was possible with the LEECs showing moderate efficiencies.