A5056616145- Nanocluster Synthesis and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Luminescence Properties of Advanced Materials
- Advanced Nanomaterials in Catalysis
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Perovskite Materials and Applications
- Additive Manufacturing and 3D Printing Technologies
- Gas Sensing Nanomaterials and Sensors
- Catalytic Processes in Materials Science
- Carbon and Quantum Dots Applications
- Inorganic Chemistry and Materials
- Organic Light-Emitting Diodes Research
- Metal-Organic Frameworks: Synthesis and Applications
- Nanofabrication and Lithography Techniques
- Advanced ceramic materials synthesis
- Advanced Condensed Matter Physics
- Glass properties and applications
- TiO2 Photocatalysis and Solar Cells
- Luminescence and Fluorescent Materials
- Catalysis and Oxidation Reactions
- Laser Material Processing Techniques
- Random Matrices and Applications
- Silicon and Solar Cell Technologies
- Aluminum Alloys Composites Properties
KU Leuven
2012-2020
Zdravstveni centar
2016
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, double-perovskite Cs2 AgBiBr6 system has emerged as promising candidate X-rays, capable high X-ray stability and sensitivity (105 μC Gy-1 cm-2 ). Herein, photophysical pathways in single-crystal are detailed at both room (RT) liquid-nitrogen (LN2 T) temperatures, with emphasis made toward...
Unmasking the glow of silver clusters Small stabilized by organic materials or inorganic surfaces can exhibit bright photoluminescence, but origin this effect has been difficult to establish, in part because are heterogeneous and contain many larger inactive clusters. Grandjean et al. studied zeolites, using x-ray excited optical luminescence monitor only emissive structures (see Perspective Quintanilla Liz-Marzán). Aided theoretical calculations, they identified electronic states four-atom...
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 strategies fabricate small-scale clusters, together with their interesting physicochemical properties (molecule-like discrete energy levels, example), make them very attractive a wide variety applied research fields, from biotechnology environmental sciences fundamental chemistry physics. Apart useful...
The synthesis and characterization of LTA(Li)–Ag zeolites with water-responsive photoluminescence properties high external quantum efficiencies is described in this study.
One of the ultimate goals in study metal clusters is correlation between atomic-scale organization and their physicochemical properties. However, direct observation atomic such minuscule heavily hindered by radiation damage imposed different characterization techniques. We present evidence structural arrangement, at an level, luminescent silver species stabilized faujasite (FAU) zeolites using aberration-corrected scanning transmission electron microscopy. Two were identified Ag-FAU...
Unraveling reversible opto-structural switching of few atom luminescent silver clusters confined in LTA zeolites by combination spectroscopic techniques.
It is reported that the ductility and strength of a metal matrix composite could be concurrently improved if reinforcing particles were size nanometers distributed uniformly. In this paper, we revealed gas atomization solidification effectively disperse TiB2 nanoparticles in Al alloy due to its fast cooling rate coherent orientation relationship between α-Al. Besides, nano-TiB2 led refined equiaxed grain structures. Furthermore, powders with uniformly embedded showed laser absorptivity. The...
Silver clusters incorporated in a zeolite matrix represent promising alternative for rare earth phosphors, organic dyes, and quantum dots as emitters hybrid organic/inorganic light‐emitting diodes (OLEDs). Compared to other existing types of emitters, they combine an excellent stability oxygen humidity with high luminescence yield color tunability. This study reports on the first use these silver exchanged zeolites embedded polyvinyl carbazole (PVK), which is expected act conducting matrix,...
The appealing luminescent properties of Ag-zeolites have been shown to be dependent on the local environment confined silver clusters. Herein, we shed light Ag clusters inside hydrated Linde-type A (LTA) zeolites and relate them nature host framework when expanded compressed by incorporation Li+ cations Ag+ loading. Within this scenario, measure a strong emission color shift in these materials, which directly correlate with fine structure details derived optical luminescence-detected X-ray...
Ag clusters (AgCLs) confined within Na-exchanged Linde type A zeolites are studied by X-ray absorption and steady-state time-resolved photoluminescence spectroscopies in a coordinated effort to elucidate the photophysical properties link them precise cluster structure. The hydrated sodalite cage contains mostly tetrahedral [Ag4(H2O)4] located at center of cages, whereas octahedral Ag6 with zeolite framework oxygen (OF) [Ag6(OF)14] formed upon dehydration. time-dependent density functional...
The recent development of light-emitting diodes (LEDs) using remote phosphors to generate white light has seen this family devices become well-positioned replace conventional lighting. They offer higher efficiencies compared traditional bulbs and do not contain toxic mercury, as with fluorescent lamps. However, the color quality emitted from commercial LEDs, which is typically bluish, yet comparable that incandescent In Perspective, we discuss potential application luminescent metal clusters...
Bright luminescent silver-adenine species were successfully stabilized in the pores of MOF-69A (zinc biphenyldicarboxylate) metal-organic framework, starting from intrinsically blue bio-MOF-1 adeninate 4,4'-biphenyldicarboxylate). Bio-MOF-1 is transformed to framework by selectively leaching structural adenine linkers original using silver nitrate solutions aqueous ethanol. Simultaneously, bright blue-green clusters are formed inside recrystallized matrix high local concentrations. The...
Metal clusters confined inside zeolite frameworks display unique electronic, catalytic, and optical properties. However, so far only silver have shown peculiar luminescent properties, displaying high photoluminescent quantum efficiencies reaching almost unity. In this study, we demonstrate the self-assembly confinement of highly lead (Pb) into molecular-sized cavities Linde Type A (LTA) zeolites. These Pb-LTA samples an intense deep-blue emission with external up to 69% in their partially...
The applicability of Ag-exchanged zeolites as efficient phosphors for the development near ultra-violet primary LEDs is described.
Abstract Herein, AlK α X‐rays are used to drive the growth of luminescent silver clusters in zeolites. The species is tracked using Auger spectroscopy and fluorescence microscopy, by monitoring evolution from their ions then metallic, dark nanoparticles. It shown that rate different zeolites determined mobility framework dynamics calcined samples obeys Hill–Langmuir equation for noncooperative binding. Comparison optical properties X‐ray‐grown with formed standard heat treatment indicates...
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 can be excited UV and some visible excitation wavelengths. The spectra have found invariant wavelength at room temperature, indicating negligible distribution cluster sites. efficiency determined by shifting the absorption edge further into an Al2O3 glass-network modifier. prepared is proposed as low-cost phosphor...
Fabrication of silver nanoparticles with limited size distribution on TiO<sub>2</sub> containing zeolites.
Controlling the morphology of organolead halide perovskite crystals is crucial to a fundamental understanding materials and tune their properties for device applications. Here, we report facile solution-based method morphology-controlled synthesis rod-like plate-like nanocrystals using binary capping agents. The control likely due an interplay between surface binding kinetics two agents at different crystal facets. By high-resolution scanning transmission electron microscopy, show that...
In this contribution, we report on the first time use of silver-exchanged zeolites embedded in nonconductive polystyrene (PS) and their as hybrid emitters light-emitting diodes (ZEOLEDs). The turn voltage EL intensity are strongly dependent concentration metal clusters. It is shown that key to optimize technology improving zeolite anode contact. Such an optimized device based cheap abundant materials could provide alternative for commercial phosphor converted LEDs. A ZEOLED with a polarity...
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 metal-exchanged zeolites.In this study, we synthesized and characterized emitting silver-sulfur zeolites, which show a color tunability upon the incorporation of silver species highly sulfur-zeolites.Via combined steady-state time-resolved...
The design, synthesis and photoluminescence characterization of sulfide cluster-based zeolitic materials with the general formula Na8[SiAlO4]6SxCl2–2x is presented in this report. employed experimental conditions, which included thermal treatment sodium Linde type A (Na-LTA) zeolites presence Na2SO4 NaCl, yielded highly photoluminescent sulfur-zeolites remarkably large Stokes shifts. An emission band at 650 nm for samples low sulfur contents observed when excited 380 nm, fully consistent S2–...
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 been reported that UV excited luminescence partially Li-exchanged sodium Linde A zeolites [LTA(Na)] containing can be controlled by adjusting water content zeolite. These samples showed dynamic change in their color from blue to green yellow upon an increase hydration...
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 photophysical properties contributing impressive performance highly X-ray detectors based on double perovskite Cs2AgBiBr6. Upon cooling device, enormous enhancements are realized tracked via optical-based studies, closing gap between...