Physics of nanocrystalline luminescent ceramics
U. Herr
Materials Division, Faculty of Engineering, Ulm University, D-89081
Ulm, Germany

An overview of recent work on size-dependent optical properties of
nanocrystalline ceramics is presented. Nanocrystalline Y2O3:Eu
particles prepared by a clean chemical vapor reaction (CVR) route are
used as a model system. Phosphors of this composition are part of
conventional fluorescent lamps, and new applications in this field
open up if the optical properties can be suitably modified in
nanoparticles. Functionalized nanoparticles might also offer new
opportunities as bio-markers. The experiments show that the emission
characteristics remain largely unchanged in nanoparticles, whereas
absorption and quantum efficiency are size dependent. These findings
can be explained using models considering the local character of the
energy transfer processes. The ceramic nano-phosphors are therefore
different from the semiconductors with larger exciton radius which
show pronounced quantum size effects in the nanometer regime.

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1. Optical properties of nanocrystalline YAG:Ce
2. Vapor phase synthesis of nanocrystalline YAG:Ce
3. Concentration dependent fluorescence lifetime in nanocrystalline Y₂O₃:Eu phosphors