A5004706504- GaN-based semiconductor devices and materials
- Luminescence Properties of Advanced Materials
- Semiconductor Lasers and Optical Devices
- Analytical Chemistry and Sensors
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Diamond and Carbon-based Materials Research
- Semiconductor Quantum Structures and Devices
- Metal and Thin Film Mechanics
- Spectroscopy and Laser Applications
- Photonic Crystals and Applications
- Nanofabrication and Lithography Techniques
- Advanced Sensor and Energy Harvesting Materials
- Organic Light-Emitting Diodes Research
- Infrared Target Detection Methodologies
- Advanced optical system design
- Color Science and Applications
- Photochemistry and Electron Transfer Studies
- Transition Metal Oxide Nanomaterials
- Laser Material Processing Techniques
- Tactile and Sensory Interactions
- Interactive and Immersive Displays
- Electrochemical Analysis and Applications
- Ion-surface interactions and analysis
- Lanthanide and Transition Metal Complexes
Joanneum Research
2010-2022
Graz University of Technology
2022
Universität Innsbruck
2013
Kimberly-Clark (Canada)
2006
Johnson & Johnson (Israel)
2006
Roche (Austria)
2003-2006
Procter & Gamble (United States)
2006
Anstalt für Verbrennungskraftmaschinen List (Austria)
1993-2000
TU Wien
1996-1998
University of Vienna
1998
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence Quenching Behavior of an Oxygen Sensor Based on a Ru(II) Complex Dissolved in PolystyrenePaul. Hartmann, Marc J. P. Leiner, and Max E. LippitschCite this: Anal. Chem. 1995, 67, 1, 88–93Publication Date (Print):January 1995Publication History Published online1 May 2002Published inissue 1 January 1995https://pubs.acs.org/doi/10.1021/ac00097a015https://doi.org/10.1021/ac00097a015research-articleACS PublicationsRequest reuse...
The design of luminescent oxygen sensors is guided by optimizing sensitivity and/or the form calibration function. Both qualities are governed molecular processes luminescence quenching. To evaluate influence matrix effects, we prepared membranes based on oxygen-sensitive phosphorescent complexes porphyrin ketones dissolved in plasticizer-free poly(vinyl chloride) (PVC) and polystyrene (PS). In a PVC matrix, both platinum(II) palladium(II) octaethylporphyrin exhibited perfectly linear...
Based on optical ray tracing, we discuss the effect of phosphor particle sizes angular homogeneity light emitted from phosphor-converted LEDs. Since blue LED and yellow-converted have rather different emission characteristics, which to be harmonized one another by scattering processes within color conversion element, size turns out an essential parameter in order attain homogeneity. This can attributed, hand, number a specific unit volume for given concentration, other functions, both depend...
We present an optical ray-tracing study which investigates the influence of refractive indexes matrix and phosphor materials as well particle sizes color conversion elements (CCE) on radiant flux phosphor-conversion-based white light-emitting diodes. show that appropriate combination those parameters is a crucial factor in order to optimize device efficacy.
Ray-tracing simulations are used to identify the demands for angular homogeneity of white light emitted from phosphor-converted light-emitting diodes having color conversion elements (CCEs) constant thickness. The reveal that a thickness CCE by itself is not sufficient homogeneous emission. Rather height and broadness as well phosphor concentration have be precisely adjusted in order assure
We present a study by optical ray-tracing in order to determine the impact of an inhomogeneous phosphor distribution color conversion elements (CCE) phosphor-conversion- based white LED light sources. It turns out that particular temperature and its angular variation, but also flux-output are highly sensitive towards variations.
Ferroelectric material supports both pyro- and piezoelectric effects that can be used for sensing pressures on large, bended surfaces. We present PyzoFlex, a pressure-sensing input device is based ferroelectric material. It constructed with sandwich structure of four layers printed easily any use this in combination high-resolution Anoto-sensing foil to support hand pen tracking. The bendable, energy-efficient, it produced printing process. Even hovering mode feasible due its pyroelectric...
The global SAW tag (Hartmann (2002)) is projected to be a large-volume device application. modulation method and overall data structure are reviewed for family of proposed radio frequency identification (RFID) devices. implemented using basic group that encodes 16 information bits 4 reflectors chosen from 75 reflector slots. Several groups placed in-line on single acoustic track achieve ID devices with capacities up 256 bits. Many RFID systems require robust operation even when numerous...
For further improvements to the reliability and white light quality of phosphor‐converted light‐emitting diodes (LEDs), it is imperative understand how compositional, optical, thermal properties materials constituting color‐conversion elements (CCEs) affect their respective loads. By means a combined optical simulation procedure, comprehensive discussion given on underlying coherences absorption profile blue LED light, phosphor concentration, quantum efficiency phosphor, conductivities CCEs....
Conventional lifetime imaging requires rather complex and expensive instrumentation, like lasers intensified CCD−cameras. We demonstrate that an array of light-emitting diodes a directly gatable CCD−camera can be alternatively used for special applications as, example, oxygen concentrations on surface covered by optical sensor. The suitability low-cost devices is in this case favored the microsecond decay times spectral properties highly luminescent ruthenium(II) complexes. For illuminated...
Ferroelectric material supports both pyro- and piezoelectric effects that can be used for sensing pressures on large, bended surfaces. We present PyzoFlex, a pressure-sensing input device is based ferroelectric (PVDF:TrFE). It constructed by sandwich structure of four layers easily printed any substrate. The PyzoFlex foil sensitive to pressure- temperature changes, bendable, energy-efficient, it produced screen-printing routine. Even hovering input-mode feasible due its pyroelectric effect....
The diatoms are ubiquitous, exist in large numbers and show a great diversity of features on their porous silica structures. Therefore, they inspire the fabrication nanostructured templates for nanoimprint processes (NIL), where structured areas with nanometer precision required. In this study, two approaches regarding respective challenges potential exploitations followed discussed: first one takes advantage template that is directly made natural occurring diatoms. Here, replication steps...
Biocompatibility improvements for blood contacting materials are of increasing interest implanted devices and interventional tools. The current study focuses on inorganic (titanium, titanium nitride, oxide) as well diamond-like carbon (DLC) coating polymer surfaces (thermoplastic polyurethane), deposited by magnetron sputtering und pulsed laser deposition at room temperature. DLC was used pure (a-C:H) doped with silicon, titanium, nitrogen + (a-C:H:Si, a-C:H:Ti, a-C:H:N:Ti). In-vitro testing...