Entwicklung von Verfahren zur Synthese nanokristalliner Partikel aus Si3N4, AlN und GaN als Ausgangsstoff für industriell anwendbare Phosphore
Zusammenfassung der Projektergebnisse
AlN nanoparticles synthesized by CVS can be used as precursors for phosphors. The transition metal impurity level is similar to the micron sized precursor material presently used by OSRAM and orders of magnitude lower than for commercially available nanoparticles. However, further optimization of the synthesis parameters and minimization of the oxygen content is required as well as an increase in production rate. Regarding the phosphor synthesis, particle morphology and size of the other reactants have to be adapted when using AlN nanoparticles from CVS as precursor material. The sinterability of our AlN nanoparticles suggests that firing temperatures can be lowered significantly by more than 200 °C due to the small particle size which is highly beneficial. A synthesis procedure for the formation of silicon nitride from ammonia and monosilane has been developed. The formation of partly or fully nitrided silicon was possible depending on process conditions. The combination of high temperature and ammonia excess can lead to almost stoichiometric Si3N4 nanoparticles. Together with OSRAM, a new synthesis process for silicon nitride-based phosphors has been developed using the new SiNx nanomaterials. It has been shown that stoichiometric silicon nitride as well as silicon rich SiNx nanoparticles could be used as precursor instead of commercial Si3N4 to synthesize Sr/Ba2Si5N8 phosphors with improved QE and phase purity.
Projektbezogene Publikationen (Auswahl)
- “Optimizing Particle Characteristics of Nanocrystalline Aluminum Nitride”. Powder Technology, Volume 326, 15 February 2018, Pages 488-497
Stevan M. Ognjanović; Markus Winterer
(Siehe online unter https://doi.org/10.1016/j.powtec.2017.12.009) - (2014): Controlled Formation of Nanomaterials for Energy Applications, 2014 CENIDE-CNMM-TIMS Joint Symposium on Interdisciplinary Nano-Science and Technology, Hsinchu, Taiwan, January 6, 2014
Hartmut Wiggers
- (2014): Controlled formation of specific Group IV semiconductors for electronic applications, MRS spring meeting, San Francisco, USA, April 22, 2014
Hartmut Wiggers
- (2015): Controlled Formation of Nanoparticles from Gas Phase for Energy Storage Applications, Shaanxi Normal University, and Ningxia University, China, May 2015
Lisong Xiao
- (2015): Routes to Nanoparticles Optimized for Energy Technology, 11th Conference for Young Scientists in Ceramics, Novi Sad, Serbia, October 21-24, 2015
M. Winterer
- (2015): Routes to Nanoparticles Optimized for Energy Technology, Gordon Research Conference, Ventura, USA, February 22-27, 2015
M. Winterer
- (2016): Controlled Formation of Nanoparticles from Gas-Phase Reactions for Energy Storage, 40th International Conference and Expo on Advanced Ceramics and Composites, Daytona Beach, USA, January 24 – 29, 2016
Lisong Xiao
- (2016): Specific nanomaterials for energy applications, Humboldt Kolleg on Nanotechnology and Nanomaterials for Sustainable Development, Luxor, Egypt, February 2, 2016
Hartmut Wiggers
