A5073967404- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Photochemistry and Electron Transfer Studies
- Advanced Materials Characterization Techniques
- Photonic and Optical Devices
- X-ray Diffraction in Crystallography
- Synthesis and characterization of novel inorganic/organometallic compounds
- Photonic Crystals and Applications
- Inorganic Chemistry and Materials
- Crystallization and Solubility Studies
- Nanofabrication and Lithography Techniques
- Molecular Junctions and Nanostructures
- Semiconductor Lasers and Optical Devices
- Fusion materials and technologies
- Hydrogen embrittlement and corrosion behaviors in metals
- Porphyrin and Phthalocyanine Chemistry
- Organometallic Complex Synthesis and Catalysis
- Chemical Synthesis and Characterization
- Nonlinear Optical Materials Studies
- Manufacturing Process and Optimization
- Augmented Reality Applications
- Aluminum Alloys Composites Properties
- Interactive and Immersive Displays
- Medical Imaging Techniques and Applications
University of Oxford
2019-2024
Friedrich-Alexander-Universität Erlangen-Nürnberg
1993-2024
Air Liquide (Germany)
2024
Physikalisch-Technische Bundesanstalt
2024
Monash University
2019
Materials Science & Engineering
2019
University of Münster
2014-2016
University of Regensburg
2009-2014
Lower Saxony State Museum
2007
University of Bonn
2003
We report an analysis of the operation a new type laser resonator with two-dimensional distributed feedback from photonic crystal. The gain medium consists 2-(4-biphenylyl)-5(4-tert-butylphenyl)-1,3,4-oxadiazole host doped Coumarin 490 and DCM is deposited on lithographically patterned Si/SiO2 structures. Bragg reflections caused by grating diminish group velocity photons along some directions crystallographic symmetry to zero, resulting gives rise oscillations. Dispersion relations for were...
Electrical impedance measurements on poly-p-phenylene-vinylene (PPV) light-emitting diodes in the frequency range between 100 Hz and 10 MHz are reported. A significant difference can be revealed device characteristics of eliminated indium-tin-oxide (ITO) those other high-work-function metals (e.g., Au). Thermal conversion precursor polymer ITO substrates results a p-type doping conjugated PPV. Hence, devices configuration ITO/PPV/Al display Schottky behavior, which modeled by simple...
Detailed investigations of the device characteristics poly-p-phenylene-vinylene (PPV) light-emitting diodes are reported. We analyze influence various hole- and electron-injecting electrodes on current–voltage (I–V) electroluminescence behavior. Our studies reveal that thermal conversion prepolymer indium–tin–oxide (ITO) substrates leads—in contrast to Au other high-work-function metals—to a p-type doping PPV and, additionally, formation an ohmic hole-injecting contact at ITO/PPV interface....
Abstract We present a detailed experimental procedure for the synthesis of poly( p ‐phenylene vinylene) by precursor route. Special emphasis is given to conditions thermal elimination reaction that leads from processable polymer 4 PPV. found temperature 320°C necessary remove sulphur and chlorine containing defect structures which are probably formed nucleophilic substitutions during elimination. PPV prepared our contains 0.12% 0.15% sulphur. With this material we able prepare large area...
This letter describes the use of printing and molding techniques to fabricate plastic photopumped laser that distributed feedback resonators on ridge waveguides. The results indicate (i) potential optoelectronic applications a set emerging low cost lithographic can pattern range materials with submicron resolution nonplanar substrates, (ii) new type based molded organic gain materials, (iii) thresholds waveguide lasers are similar their planar counterparts.
New oxadiazole polymers for use in LEDs are reported that have high thermal stability and excellent film‐forming properties. The characteristics of the themselves heterolayer based on poly(phenylenevinylene) incorporate as efficient elecron transport injection layers discussed. stability, operating time quantum efficiency shown to be improved compared monolayer devices.
Pure silicon building blocks in solution are an exciting addition to the repertoire of materials science Group 14 elements. The preparation complex [{Ni(CO)2}2(μ-Si9)2]8− shows that rational synthetic transformations with Si94− Zintl ion feasible. Detailed facts importance specialist readers published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note: publisher is responsible for content...
We describe the use of low cost printing and molding techniques to fabricate distributed feedback Bragg reflector resonators for photoexcited plastic lasers that have narrow emission profiles in visible range. The good performance demonstrates suitability these fabricating certain types functional optoelectronic devices require submicron features patterned over macroscopic areas.
Employing thermally stimulated current (TSC) technique, the existence of distinct trap distributions in poly(p-phenylenevinylene) (PPV) light-emitting devices has been established. In with an indium tin-oxide (ITO) anode two TSC peaks temperature range between 100 and 150 K are observed. They correspond to levels a depth 0.03–0.06 eV 0.13–0.18 eV, respectively. The total density these species is order 1016 cm−3 which good agreement dopant concentration obtained from capacitance-voltage...
We report on the far-field emission characteristics of two-dimensional photonic crystal-based organic waveguide lasers. The crystals possess square vein, triangular, and honeycomb symmetries. gratings are fabricated by employing soft lithographic methods. pattern that we observe is a result out-of-plane diffractive coupling laser generated in plane waveguide. This offers convenient powerful way to evaluate nature action such resonators. In devices which defects/breaks periodicity grating,...
Abstract We investigated a new method for estimating specimen hydrogen content in atom probe tomography (APT) experiments where molecular ions () originating from the measurement environment can overlap with deuterium (D+) mass-to-charge-state spectrum, thus preventing direct application of isotopic marking unambiguous analysis. First, we applied an existing estimation, using ratios obtained paired deuterated/nondeuterated experiments. These measurements demonstrated sufficient residual...
A large number of atom probe tomography (APT) datasets from past experiments were collected into a database to conduct statistical analyses. An effective way handling the data is shown, and study on hydrogen conducted illustrate usefulness this approach. We propose handle collection APT spectra as point cloud use city block distance-based metric measure dissimilarity between spectra. This enables quick automated searching for by similarity. Since similar materials are similar, contains...
Reine Silicium-Bausteine in Lösung erweitern das Repertoire der Materialwissenschaft im Bereich Gruppe-14-Elemente. Die Bildung des Komplexanions [{Ni(CO)2}2(μ-Si9)2]8− demonstriert, dass Si94−-Zintl-Anion für gezielte Synthesen nutzbar ist (siehe Schema). Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by the authors. Please note: The publisher is...
We demonstrate the formation, in a single process step, of periodic arrays features surface relief with submicrometer lateral dimensions hybrid organic and inorganic solgel glasses by using elastomeric molding techniques. Lasers formed molded photonic crystal resonators that consist triangular, square, honeycomb lattices cylindrical posts holes show emission spectra lasing thresholds are similar to devices conventional high-resolution photolithographic patterning thick layers thermally grown oxide.
In this kinetic and thermodynamic study, the reversible outer-sphere electron-transfer reactions between a series of Ru(NH(3))(5)L(3+/2+) complexes (L = etpy, py, lut) (etpy 4-ethylpyridine; py pyridine; lut 3,5-lutidine) cytochrome c were investigated as function ionic strength, buffer, pH, temperature, pressure. Due to low driving forces these systems, it was possible study all in both redox directions. The observed rate constants for various L are correlated on basis ability ligands...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand-substitution reactions of aquacobalamin (vitamin B12a) revisited. Conclusive evidence for the operation a dissociative interchange mechanismMartin Meier and Rudi van EldikCite this: Inorg. Chem. 1993, 32, 12, 2635–2639Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.acs.org/doi/10.1021/ic00064a011https://doi.org/10.1021/ic00064a011research-articleACS...