Wouter Baekelant

Wouter Baekelant
KU Leuven | ku leuven · Department of Chemistry

PhD

About

33
Publications
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814
Citations

Publications

Publications (33)
Article
Herein, AlKα X‐rays are used to drive the growth of luminescent silver clusters in zeolites. The growth of the silver species is tracked using Auger spectroscopy and fluorescence microscopy, by monitoring the evolution from their ions to luminescent clusters and then metallic, dark nanoparticles. It is shown that the growth rate in different zeolit...
Article
Metal clusters confined inside zeolite materials display remarkable luminescent properties, making them very suitable as potential alternative phosphors in white LED applications. However, up to date, only single-color emitters have been reported for luminescent metal-exchanged zeolites. In this study, we synthesized and characterized white emittin...
Article
Silver clusters (AgCLs) confined in zeolites show remarkable luminescent properties, displaying high photoluminescent quantum efficiencies combined with tunable visible light emission characteristics, making them highly promising phosphors in lighting devices. However, up to now a lack of efficient near-ultraviolet (NUV) and blue excitable silver z...
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
Ag clusters (AgCLs) confined within Na exchanged-LTA zeolites are studied by X-ray absorption, and steady-state and time-resolved photoluminescence spectroscopies in a coordinated effort to elucidate the photophysical properties and link them to the precise cluster structure. The hydrated sodalite cage contains mostly tetrahedral [Ag4(H2O)4] cluste...
Article
The sensitive detection of X‐rays embodies an important research area, being motivated by a common desire to minimize the radiation doses required for detection. In article number 1804550, Julian A. Steele, Maarten B. J. Roeffaers, and co‐workers detail the photophysical properties contributing to the impressive performance of highly sensitive X‐ra...
Article
Full-text available
The sensitive detection of X‐rays embodies an important research area, being motivated by a common desire to minimize the radiation doses required for detection. Among metal halide perovskites, the double‐perovskite Cs2AgBiBr6 system has emerged as a promising candidate for the detection of X‐rays, capable of high X‐ray stability and sensitivity (1...
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
Full-text available
Silver (Ag) clusters confined in matrices possess remarkable luminescence properties, but little is known about their structural and electronic properties. We characterized the bright green luminescence of Ag clusters confined in partially exchanged Ag-Linde Type A (LTA) zeolites by means of a combination of x-ray excited optical luminescence-exten...
Article
Full-text available
Luminescent silver clusters (AgCLs) stabilized inside partially Ag exchanged Na LTA zeolites show a remarkable reversible on-off switching of their green-yellowish luminescence that is easily tuned by a hydration and dehydration cycle, making them very promising materials for sensing applications. We have used a unique combination of photoluminesce...
Article
The design, synthesis and photoluminescence characterization of sulphide cluster-based zeolitic materials with the general formula Na8[SiAlO4]6SxCl2-2x is presented in this report. The employed experimental conditions, which included the thermal treatment of sodium Linde type A (Na-LTA) zeolites in presence of Na2SO4 and NaCl, yielded highly photol...
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 recent development of light emitting diodes (LEDs) using remote phosphors to generate white light has seen this family of devices become well-positioned to replace conventional lighting. They offer higher efficiencies compared to traditional bulbs and do not contain toxic mercury, as with fluorescent lamps. However, the color quality of the lig...
Article
Interest for functional silver clusters (Ag-CLs) has rapidly grown over years due to large advances in the field of nanoscale fabrication and materials science. The continuous development of strategies to fabricate small-scale silver clusters, together with their interesting physicochemical properties (molecule-like discrete energy levels, for exam...
Article
Full-text available
Controlling morphology of organolead halide perovskite crystals is crucial to a fundamental understanding of the materials and to tune their properties for device applications. Here, we report a facile solution-based method for morphology-controlled synthesis of rod-like and plate-like organolead halide perovskite nanocrystals using the binary capp...
Article
Full-text available
It is reported that the ductility and strength of a metal matrix composite could be concurrently improved if the reinforcing particles were of the size of nanometers and distributed uniformly. In this paper, we revealed that gas atomization solidification could effectively disperse TiB 2 nanoparticles in the Al alloy matrix due to its fast cooling...
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
Small silver clusters confined inside zeolite matrices have recently emerged as a novel type of highly luminescent materials. Their emission has high external quantum efficiencies (EQE) and spans the whole visible spectrum. It has been recently reported that the UV excited luminescence of partially Li-exchanged sodium Linde type A zeolites [LTA(Na)...
Conference Paper
Full-text available
The production of zinc by Direct Metal Printing (DMP) is explored with an aim to understand the influence of different DMP process parameters on the melting, evaporation and solidification of zinc powders. The study of single track (1D) scans with and without powder enabled a first estimation of a stable process window. In the 2D experiments, the h...
Article
One of the ultimate goals in the study of metal clusters is the correlation between the atomic-scale organization and their physicochemical properties. However, direct observation of the atomic organization of such minuscule metal clusters is heavily hindered by radiation damage imposed by the different characterization techniques. We present direc...
Article
The integration of metal atoms and clusters in well-defined dielectric cavities is a powerful strategy to impart new properties to them that depend on the size and geometry of the confined space as well as on metal-host electrostatic interactions. Here, we unravel the dependence of the electronic properties of metal clusters on space confinement by...
Article
Full-text available
Bright luminescent silver-adenine species were successfully stabilized in the pores of the MOF-69A (zinc biphenyldicarboxylate) metal-organic framework, starting from the intrinsically blue luminescent bio-MOF-1 (zinc adeninate 4,4’-biphenyldicarboxylate). Bio-MOF-1 is transformed to the MOF-69A framework by selectively leaching structural adenine...
Article
Full-text available
Silver-zeolite composites are interesting materials with unique optical properties such as high external quantum efficiencies and large Stokes shifts. The selective formation of luminescent silver clusters within zeolite scaffolds can be achieved by varying silver guest and zeolite host conditions. Nevertheless, at present, the controlled synthesis...
Article
Ag nanocluster-doped glasses have been prepared by a conventional melt-quenching method. The effect of melt temperature and dwell time on the formation of Ag nanoclusters and Ag nanoparticles in simple host oxyfluoride glasses has been studied. The increase of melt temperature and dwell time results in the dissolution of Ag nanoparticles and substa...
Article
Full-text available
Silver–zeolite composites are interesting materials with unique optical properties such as high external quantum efficiencies and large Stokes shifts. The selective formation of luminescent silver clusters within zeolite scaffolds can be achieved by varying silver guest and zeolite host conditions. Nevertheless, at present, the controlled synthesis...
Article
Full-text available
Here we present a simple route to produce well defined photo-reduced silver nanoparticles on TiO2 containing Ag-exchanged zeolites. We used natural and artificial irradiation sources to study their effect on the particle size distribution. The samples were investigated by electron microscopy, X-ray diffraction, fluorescence microscopy and UV-Vis di...
Article
Full-text available
Bulk SiO2-PbF2 oxyfluoride glasses co-doped with dispersed luminescent Ag nanoclusters and Tm3+ ions have been prepared by conventional melt-quenching method. Luminescence from 400 to 900 nm has been excited in this glass by UV light from 340 to 400 nm. The prepared glass has potential for application as a low cost glass phosphor in Hg-free white l...
Article
Bulk SiO2–PbF2 glass doped homogeneously with luminescent Ag nanoclusters has been synthesized using a melt-quenching technique. A broad range of luminescence from 400 nm to 900 nm can be excited with a broad range of UV and some visible excitation wavelengths. The luminescence spectra have been found to be invariant with excitation wavelength at r...
Article
The cumulative installed solar power generation has been rising exponentially over the past decade. This has lead to a concomitant rise in production capabilities, leading eventually to excess production capabilities and rapid price declines per unit. In order to compete with the standard electricity generation the cost of solar panel production an...

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Supramolecular chemistry studies chemistry beyond individual molecules, where molecules or macromolecules form larger entities with interesting, novel properties and this by spontaneous self-assembly. This concept of self-organizing nanoscale building blocks (which can be organic, organometallic, metallic and oxidic) into (hybrid) materials results in hierarchical systems that spatially can extend from nano to micron-size and beyond and this in 1, 2 or 3 dimensions. Uniquely, this supramolecular chemistry enables control and guiding the chemical properties (adsorption affinity, reactivity or catalytic activity) as well as the physical properties (mechanical, electrical, optical etc.), at different length scales and in different directions. Therefore, supramolecular self-assembled systems have potential functionalities that tremendously surpass the scope of classical molecular systems in the liquid state, or of classical porous solids. This potential functionality encompasses the type and number of functions that can simultaneously be fulfilled, as well as the range of viable operating conditions. SACS focuses on the formation of functional structures with novel, unique properties through self-assembly in restricted or controlled space and on formation of assemblies with strictly controlled geometries, size and shape and outstanding properties. The functionalities that are specifically aimed for are: electrical conductivity, optical properties and catalytic activity.