Through a combination of site selective spectroscopy (x-ray absorption, electron paramagnetic resonance and luminescence spectroscopy), rare earth doped luminescent materials are investigated. Combined with structural research, this yields information on the exact surroundings of the rare earths. Since the luminescent properties are strongly dependent on this, the research is also important for potential applications.
Development and optimization of X-ray based analytical techniques towards the analysis of rare extraterrestrial materials. Ghent University
Micro-XRF spectroscopy, using synchrotron or conventional X-ray source based excitation, is a well-established non-destructive, microanalytical method, providing information on the elemental distributions in the probed sample. When three dimensional spatially resolved information is of interest, often a confocal micro-XRF detection scheme is applied as an alternative to XRF tomography. However, both methods pose significant challenges when ...
Optical spectroscopy of rare-earth (lanthanide) ions doped iparent nano-glass-ceramics with application to plasmonic and meta-materio-structures. KU Leuven
Non-rare earth luminescent materials for displays and lighting Ghent University
The currently used luminescent materials for LEDs and diplays are based on the light emission of lanthanides. Due to their increasing cost and shortage, it is necessary to develop alternative materials,, especially for large light emitting surfaces. The project aims at investigating and developing such new materials. This is of fundamental importance, but also has a large economic potential.
Optimization of rare-earth containing nanophosphor design by synchrotron-based X-ray scattering and X-ray absorption techniques Ghent University
The local structure around luminescent lanthanide ions inside a nanoparticle will be investigated by the synchrotron based techniques EXAFS and HEXS, as well as by UV-vis-NIR absoroption and luminescence spectroscopy. The knowledge about the local symmetry, the number of neighboring ions and the distance to the central lanthanide ion will be related to the luminescence performance of the nanoparticle, in order to optimize synthetic pathways ...
Preparation and luminescent properties investigation of red and near-infrared emitting Mn4+, Ln3+-doped Al-based nano-fluoride phosphors Ghent University
Novel Mn4+,Ln3+-doped (Ln3+ = Eu3+,Dy3+,Tb3+,Sm3+,Yb3+,Er3+,Tm3+,Ho3+) Al-based with alkali metal, alkali earth metal or rare earth elements nano-fluorides will be prepared using a hydrothermal method. The emission positions will locate at red region based on the occupancies of Al3+ sites by Mn4+ and different regions for Ln3+ sites by alkali earth metal or rare earth elements originated from close ionic radius between them. Owing to the ...