Optoelectronic properties of nanoscale and advanced materials (Ruck, Trodahl, Reeves, LeRu, Metson, Williams)
Several members of the rare-earth nitride series are known to be magnetic semiconductors, and we will measure their electrical conductivity and photoconductivity at room temperature and in their low-temperature magnetic phase. The results will be interpreted in terms of modern band structure calculations, and in terms of models of the crystalline defects in the materials. Work will focus on gadolinium, samarium and europium nitride. We will investigate rare-earth doped glass ceramics from the perspective of potential optical gain media, focusing on the effect of particle size on radiative lifetimes with the aid of the fluorolog and SAXS instruments. The optical properties of mixed metal oxides/oxynitride systems will also be investigated.