| People | Locations | Statistics |
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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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Samuel, Ifor David William
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (69/69 displayed)
- 2023Manipulation of structure and optoelectronic properties through bromine inclusion in a layered lead bromide perovskitecitations
- 2022Solution-processable perylene diimide-based electron transport materials as non-fullerene alternatives for inverted perovskite solar cellscitations
- 2021Development of Quantum Dots (QD) based color converters for multicolor displaycitations
- 2021Organic photovoltaics for simultaneous energy harvesting and high-speed MIMO optical wireless communicationscitations
- 2021Organic photovoltaics for simultaneous energy harvesting and high-speed MIMO optical wireless communicationscitations
- 2021New thiophene-based conjugated macrocycles for optoelectronic applicationscitations
- 2020Correlating Phase Behavior with Photophysical Properties in Mixed‐Cation Mixed‐Halide Perovskite Thin Filmscitations
- 2019Low threshold polariton lasing from a solution-processed organic semiconductor in a planar microcavitycitations
- 2019Interface limited hole extraction from methylammonium lead iodide filmscitations
- 2018Triptycene as a supramolecular additive in PTB7:PCBM blends and its influence on photovoltaic propertiescitations
- 2018The role of metallic dopants in improving the thermal stability of the electron transport layer in organic light-emitting diodescitations
- 2017Charge carrier localised in zero-dimensional (CH 3 NH 3 ) 3 Bi 2 1 9 clusterscitations
- 2017Tuning crystalline ordering by annealing and additives to study its effect on exciton diffusion in a polyalkylthiophene copolymercitations
- 2017Charge carrier localised in zero-dimensional (CH3NH3)3Bi219 clusterscitations
- 2017Charge carrier localised in zero-dimensional (CH3NH3)3Bi219 clusterscitations
- 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
- 2017An investigation of the energy levels within a common perovskite solar cell device and a comparison of DC/AC surface photovoltage spectroscopy Kelvin Probe measurements of different MAPBI3 perovskite solar cell device structurescitations
- 2017Blue-to-green emitting neutral Ir(III) complexes bearing pentafluorosulfanyl groupscitations
- 2017Novel 4,8-benzobisthiazole copolymers and their field-effect transistor and photovoltaic applicationscitations
- 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
- 2016Morphology-specific inhibition of β-amyloid aggregates by 17β-hydroxysteroid dehydrogenase type 10citations
- 2016Morphology-specific inhibition of β-amyloid aggregates by 17β-hydroxysteroid dehydrogenase type 10citations
- 2016Morphology and local electrical properties of PTB7:PC71BM blendscitations
- 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
- 2016Highly luminescent colloidal CdS quantum dots with efficient near-infrared electroluminescence in light-emitting diodescitations
- 2015Morphology and local electrical properties of PTB7:PC 71 BM blendscitations
- 2015Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modificationcitations
- 2015Solvent immersion nanoimprint lithography of fluorescent conjugated polymerscitations
- 2015Morphology and local electrical properties of PTB7:PC71BM blendscitations
- 2014Real-time probing of β-amyloid self-assembly and inhibition using fluorescence self-quenching between neighbouring dyescitations
- 2014Photophysical and structural characterisation of in situ formed quantum dotscitations
- 2012Poly(dendrimers) with Phosphorescent Iridium(III) Complex-Based Side Chains Prepared via Ring-Opening Metathesis Polymerizationcitations
- 2012A Shift from Diffusion Assisted to Energy Transfer Controlled Fluorescence Quenching in Polymer-Fullerene Photovoltaic Blendscitations
- 2011Efficient Phosphorescence by Reducing lntrachain Chromophore Interactions in Dendrimer-Containing Polymerscitations
- 2010Synthesis and Electropolymerization of Hexadecyl Functionalized Bithiophene and Thieno[3,2-b]thiophene End-Capped with EDOT and EDTT Unitscitations
- 2010A phosphorescent poly(dendrimer) with increased viscosity for solution-processed OLED devicescitations
- 2010The development of poly(dendrimer)s for advanced processingcitations
- 2010A Phosphorescent Poly(dendrimer) Containing Iridium(III) Complexes: Synthesis and Light-Emitting Propertiescitations
- 2009Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Compositescitations
- 2009Effects of thermal annealing on the photophysical properties of bisfluorene-cored dendrimer filmscitations
- 2009The development of phenylethylene dendrons for blue phosphorescent emitterscitations
- 2009High-Triplet-Energy Dendronscitations
- 2009High-Triplet-Energy Dendrons:Enhancing the Luminescence of Deep Blue Phosphorescent Iridium(III) Complexescitations
- 2009The Development of Luminescent Concentrators for Pumping Organic Semiconductor Laserscitations
- 2008Thickness Dependence of the Fluorescence Lifetime in Films of Bisfluorene-Cored Dendrimerscitations
- 2008Solution-Processible Phosphorescent Blue Dendrimers Based on Biphenyl-Dendrons and Fac-tris(phenyltriazolyl)iridium(III) Corescitations
- 2008Distance dependence of excitation energy transfer between spacer-separated conjugated polymer filmscitations
- 2004Relating the physical structure and optical properties of conjugated polymers using neutron reflectivity in combination with photoluminescence spectroscopycitations
- 2003Polymer laser fabricated by a simple micromolding processcitations
- 2003Polarized organic electroluminescence: Ordering from the topcitations
- 2002Optical properties of a light-emitting polymer directly patterned by soft lithographycitations
- 2002Index and relief gratings in polymer films for organic distributed feedback laserscitations
- 2002Fabrication of refractive index and relief gratings in polymer films for DFB lasers
- 2002Emission characteristics and photonic band structure of microstructured polymer lasers
- 2002Synthesis and excited state spectroscopy of tris (distyrylbenzenyl) amine-cored electroluminescent dendrimers
- 2002A Neutron reflection study on soluble and insoluble poly[2-(2 '- ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene) filmscitations
- 2002Controlling the optical emission from the polymer MEH-PPV using corrugated thin film structurescitations
- 2002Photonic band structure and emission characteristics of a metal-backed polymeric distributed feedback lasercitations
- 2001Photonic band structure and emissive characteristics of MEH-PPV textured microcavities
- 2001Modification of polymer light emission by lateral microstructure
- 2001Charge transport in conjugated dendrimers for light-emitting diodes
- 2001Manufacturing flexible light-emitting polymer displays with conductive lithographic film technology
- 2001Nanoengineering of organic semiconductors for light-emitting diodes: control of charge transport
- 2000Effects of dipole orientation and birefringence on the optical emission from thin filmscitations
- 2000Tuneability of amplified spontaneous emission through control of the waveguide-mode structure in conjugated polymer filmscitations
- 2000Electroluminescence from a new distyrylbenzene based triazine dendrimer
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article
Blue-to-green emitting neutral Ir(III) complexes bearing pentafluorosulfanyl groups
Abstract
A structure-property relationship study of neutral heteroleptic (<b>1</b> and <b>2</b>, [Ir(C^N)<sub>2</sub>(L^X)]) and homoleptic (<b>3</b> and <b>4</b>, <i>fac</i>-[Ir(C^N)<sub>3</sub>]) Ir(III) complexes [where L^X = anionic 2,2,6,6-tetramethylheptane-3,5-dionato-<i>κO</i><sup>3</sup>,<i>κO</i><sup>6</sup> (thd) and C^N = a cyclometalating ligand bearing a pentafluorosulfanyl (-SF<sub>5</sub>) electron-withdrawing group (EWG) at C4 (H<b>L1</b>) and C3 (H<b>L2</b>) positions of the phenyl moiety] is presented. These complexes have been fully structurally characterised, including by single crystal X-ray diffraction, and their electrochemical and optical properties have also been extensively studied. While complexes <b>1</b> ([Ir(<b>L1</b>)2(thd)]), <b>3</b> (Ir(<b>L1</b>)3) and <b>4</b> (Ir(<b>L2</b>)3) exhibit irreversible first reduction waves based on the pentafluorosulfanyl substituent in the range of -1.71 V to -1.88 V (<i>vs</i>. SCE), complex <b>2</b> ([Ir(<b>L2</b>)2(thd)]) exhibits a quasi-reversible pyridine<sub>C^N</sub>-based first reduction wave that is anodically-shifted at -1.38 V. The metal+C^N ligand oxidation waves are all quasi-reversible in the range of 1.08-1.54 V (<i>vs</i>. SCE). The optical gap, determined from the lowest energy absorption maxima, decreases from <b>4</b> to <b>2</b> to <b>3</b> to <b>1</b> and this trend is consistent with the Hammett behaviour (σ<sub>m</sub>/σ<sub>p</sub> with respect to the metal-carbon bond) of the –SF<sub>5</sub> EWG. In degassed acetonitrile, for complexes <b>2</b>-<b>4</b>, introduction of the -SF<sub>5</sub> group produced a blue-shifted emission (λ<sub>em</sub> = 484-506 nm) compared to reference complexes [Ir(ppy)<sub>2</sub>(acac)], <b>R1</b> (where acac = acetylacetonato) (λ<sub>em</sub> = 528 nm in MeCN), [Ir(CF<sub>3</sub>-ppy)(acac)], <b>R3</b> (where CF<sub>3</sub>-ppy = 2-(4-(trifluoromethyl)phenyl)pyridine) (λ<sub>em</sub> = 522 nm in DCM) and [Ir(CF<sub>3</sub>-ppy)<sub>3</sub>], <b>R8</b> (λem = 507 nm in MeCN). The emission of complex <b>1</b>, by contrast, was modestly red-shifted (λem = 534 nm). Complexes <b>2</b> and <b>4</b>, where the –SF<sub>5</sub> EWG is substituted para to the Ir-C<sub>ppy</sub> bond are efficient phosphorescent emitters, with high photoluminescence quantum yields (Φ<sub>PL</sub> = 58-79% in degassed MeCN solution) and microsecond emission lifetimes (τ<sub>ε</sub> = 1.35-3.02 μs). Theoretical and experimental observations point towards excited states that are principally ligand-centered (<sup>3</sup>LC) in nature, but with a minor metal-to-ligand charge-transfer (<sup>3</sup>MLCT) transition component, as a function of the regiochemistry of the pentafluorosulfanyl group. The <sup>3</sup>LC character is predominant over the mixed <sup>3</sup>CT character for complexes <b>1</b>, <b>2</b> and <b>4</b> while in complex <b>3</b>, there is exclusive <sup>3</sup>LC character as demonstrated by unrestricted Density Functional Theory (DFT) calculations. The short emission lifetimes and reasonable Φ<sub>PL</sub> values in doped thin film (5 wt% in PMMA), particularly for <b>4</b>, suggest that these neutral complexes would be attractive candidate emitters in organic light-emitting diodes.