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Koen Kennes

Koen Kennes
imec · 3D System Integration Program

Doctor of Philosophy, Chemistry

About

35
Publications
4,148
Reads
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263
Citations
Additional affiliations
August 2018 - present
imec
Position
  • Engineer
January 2018 - July 2018
KU Leuven
Position
  • PostDoc Position
March 2016 - October 2017
IFP Energies nouvelles
Position
  • PostDoc Position

Publications

Publications (35)
Article
In this study, a water-stable microcrystalline bioMOF was synthesized, characterized, and loaded with silver ions or highly emissive rare earth (RE) metals like Eu ³⁺ /Tb ³⁺ . The obtained materials were used used...
Article
In this contribution we report on the first time use of silver exchanged zeolites embedded in the non-conductive polystyrene (PS) and their use as hybrid emitters in light emitting diodes (ZEOLEDs). The turn on voltage and EL intensity, are strongly dependent on the concentration of metal clusters. It is shown that the key to optimize this technolo...
Article
The excited state dynamics of four 5,10-dihydrobenzo[a]indolo[2,3-c]carbazoles in solution and in film were studied with stationary and time resolved spectroscopy. The solvent dependency of the photophysics reveals no appreciable dipole moment in the ground state. In the excited state, electron withdrawing substituents contribute to an outspoken ch...
Article
In this paper, a new D-A bipolar luminescent azaindole is synthesized and fully characterized. The triphenylamine (TPA) derivative acting as a hole-transporting unit (D) and 2-cyanoacrylic acid acting as electron-transporting unit (A) are incorporated in the same molecule. This luminogen, based on azaindole, presents aggregation-induced emission (A...
Article
The appealing luminescent properties of Ag-zeolites have shown to be dependent on the local environment of the confined silver clusters. Herein we shed light on the properties of Ag clusters inside hydrated Linde-type A (LTA) zeolites and relate them to the nature of the host framework, upon being expanded and compressed by the incorporation of Li+...
Article
The Front Cover shows benzo[a]indolo[2,3‐c]carbazole in the spotlight. From five possible indolocarbazole isomers, the indolo[2,3‐c]carbazole isomer is the least explored. A straightforward synthesis from readily available starting materials and several post‐functionalization strategies is discussed. Tunability of the spectroscopic properties of be...
Article
Only a few straightforward procedures for the preparation of indolo[2,3‐c]carbazoles are known, despite promising features for material applications. Herein we present a convenient synthesis of 5,10‐dihydrobenzo[a]indolo[2,3‐c]carbazoles via oxidative cyclization of 1,2‐ bis(1H‐indol‐2‐yl)benzenes prepared from readily accessible starting materials...
Article
Full-text available
Metal clusters confined inside zeolite frameworks display unique electronic, catalytic and optical properties. However, so far only confined silver clusters have shown peculiar luminescent properties, displaying high photoluminescent quantum efficiencies reaching almost unity. In this study, we demonstrate the self-assembly and confinement of highl...
Article
The fabrication and characterization of a first organic light‐emitting diode (OLED) based on metal‐organic framework (MOF) are reported in article number 1701060 by Mario Gutierrez, Cristina Martin, Abderrazzak Douhal and co‐workers. The device uses an emissive layer of Zr‐based MOF formed by Zr‐oxide clusters and naphthalene linkers providing pore...
Article
Localization based super-resolution microscopy has become an indispensable tool in biology to study features smaller than the diffraction limit of light. In a multi-color approach, adequate spectral separation of the different photoswitchable probes is required. A far-red emitting dye is often one of the labels of choice. However, irradiation with...
Article
The search for new smart-materials in solid-state light-emitting applications, like hybrid organic–inorganic light-emitting devices (OLEDs), has seen an intense growth in the recent years. Among all the possibilities, metal-organic frameworks (MOFs) have emerged as promising smart materials due to their chemical and structural properties. Herein, f...
Article
Full-text available
Correlative imaging by fluorescence and force microscopy is an emerging technology to acquire orthogonal information at the nanoscale. Whereas atomic force microscopy (AFM) excels at resolving the envelope structure of nanoscale specimen, fluorescence microscopy can detect specific molecular labels, which enables the unambiguous recognition of mole...
Article
A new luminescent azaindole derivative has been designed and synthesized. The molecular geometry and frontier orbital energy have been investigated by using density functional theory (DFT). This newly synthesized molecule emits strongly both in solution and solid state. The fluorescence signal is reduced and red-shifted with increasing solvent pola...
Article
Full-text available
This study reports on the use of a self-assembling organogel, 5-(4-nonylphenyl)-7-azaindole (1), as a new emitter in small-molecule organic light emitting devices (OLEDs). The theoretical calculations along with the photophysical characterization studies suggest the coexistence of the monomer and dimer species at high concentration of compound 1. T...
Article
Full-text available
In this report we reveal the presence of significant variations in Brønsted catalytic activity within and between individual H-ZSM-5 zeolite crystals. Fluorescence microscopy in combination with a fluorogenic probe was used to resolve the catalytic activity at the nanoscale. The observed variations in catalytic activity could be directly linked to...
Article
Full-text available
Silver clusters incorporated in a zeolite matrix represent a promising alter-native for rare earth phosphors, organic dyes, and quantum dots as emit-ters in organic and hybrid organic/inorganic light-emitting diodes (OLEDs). Compared to other existing types of emitters, they combine an excellent stability to oxygen and humidity with a high luminesc...
Article
Full-text available
The fluorescence intermittency or “blinking” of single molecules of ATTO647N (ATTO) in the conductive matrix polyvinylcarbazole (PVK) is described in the presence of an external applied electric field. It is shown that due to the energy distribution of the highest occupied molecular orbital (HOMO) level of PVK, which is energetically close to the H...
Article
Full-text available
The synthesis and the photophysical characterization at the ensemble and single molecule level of a terrylenediimide (TDI) dimer are reported. The spectroscopic experimental data are compared with those obtained for the corresponding model compound TDI. Steady-state and ps time-correlated single photon counting have shown that both chromophores in...
Article
Full-text available
A novel π-conjugated triad and a polymer incorporating indolo[3,2-b]-carbazole (ICZ) and 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) were synthesized via a Sonogashira coupling. Compared to the parent BODIPY the absorption and fluorescence spectrum were for both compounds broader and red-shifted. The red-shift of the fluorescence and the de...
Article
Full-text available
Two new terrylenediimide (TDI) chromophores with cyano substituents in the bay and core area (BCN-TDI and OCN-TDI, respectively) have been characterized by a wide range of techniques and their applicability for stimulated emission depletion (STED) microscopy has been tested. By cyano substitution an increase of the fluorescence quantum yield and a...
Article
Full-text available
The photodynamic properties of a series of Fe(iii)-MOFs have been examined via redox reactions with N,N,N',N'-tetramethyl-p-phenylenediamine as an electron donor and methyl viologen as an electron acceptor. Furthermore, photogeneration of long-lived species in MIL-88B(Fe) has been proven via transient absorption spectroscopy.

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